WO2014087876A1 - Image display device and method for driving same - Google Patents

Image display device and method for driving same Download PDF

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Publication number
WO2014087876A1
WO2014087876A1 PCT/JP2013/081712 JP2013081712W WO2014087876A1 WO 2014087876 A1 WO2014087876 A1 WO 2014087876A1 JP 2013081712 W JP2013081712 W JP 2013081712W WO 2014087876 A1 WO2014087876 A1 WO 2014087876A1
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WO
WIPO (PCT)
Prior art keywords
light
light source
unit
color
display panel
Prior art date
Application number
PCT/JP2013/081712
Other languages
French (fr)
Japanese (ja)
Inventor
朋幸 石原
Original Assignee
シャープ株式会社
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Filing date
Publication date
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2014087876A1 publication Critical patent/WO2014087876A1/en

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133621—Illuminating devices providing coloured light
    • G02F1/133622—Colour sequential illumination
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0235—Field-sequential colour display
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0686—Adjustment of display parameters with two or more screen areas displaying information with different brightness or colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals

Definitions

  • the present invention relates to an image display device, and more particularly to an image display device driven by a field sequential method and a driving method thereof.
  • the field sequential method is a light emitting diode (Light Emitting Diode: LED) or a cold cathode tube (Cold Cathode Fluorescent Lamp: CCFL) that emits backlight.
  • the elements are switched in order, and in synchronization with the switching, color data corresponding to the light color of each light-emitting element is sequentially given to the liquid crystal panel to control the transmission state of the liquid crystal panel, thereby adding on the observer's retina.
  • This is a method of mixing colors.
  • color display can be performed without forming a plurality of sub-pixels in one pixel, so that high resolution can be achieved.
  • the light from these light emitting elements can be used as they are, it is not necessary to form a color filter in each pixel, and the light use efficiency of each light emitting element is improved.
  • a technique related to such a field sequential method is disclosed in Japanese Unexamined Patent Publication No. 2000-122589, for example.
  • Japanese Unexamined Patent Application Publication No. 2010-91609 discloses a liquid crystal display device including a liquid crystal panel, a shutter film, a control unit, a light source, a case, and an observation object.
  • the light source and the observation object are provided inside the case.
  • the shutter film can be switched between a first state which is a transparent state and a second state which is an opaque state (a cloudy state) by the control unit. By controlling the state of the shutter film, image display and background transmission (observation object display) are possible.
  • FIG. 21 is a diagram illustrating the principle of occurrence of color breakup.
  • the vertical axis represents time
  • the horizontal axis represents the position on the screen.
  • an object of the present invention is to provide an image display device and a driving method thereof that can improve the efficiency of use of light source light and transmit the background while suppressing deterioration in display quality and increase in size.
  • a first aspect of the present invention divides one frame period of a given input signal into a plurality of subframe periods, and displays a color image corresponding to one of a plurality of colors for each subframe period.
  • An image display device for displaying A display panel for controlling the transmittance of incident light; A light source unit; Irradiation of at least a part of the light emitted from the light source unit, which is arranged facing the display panel, to the display panel and at least a part of the light incident from the main surface opposite to the side where the display panel is located
  • a light control unit capable of transmitting The light source unit controls the light control so that light of a color corresponding to one of a plurality of colors is emitted from the light control unit independently to each of the plurality of areas of the display panel for each subframe period. It is characterized by irradiating the part with light.
  • the light source unit includes a plurality of unit light sources respectively corresponding to the plurality of areas,
  • the unit light source is A light-emitting element group composed of a plurality of light-emitting elements respectively corresponding to a plurality of primary colors; And an optical element that defines an irradiation range of light from the light emitting element group.
  • the light source unit includes a plurality of unit light sources corresponding to each area and corresponding to a plurality of primary colors,
  • the unit light source corresponding to each primary color is A light emitting device corresponding to the primary color;
  • an optical element that defines an irradiation range of light from the light emitting element.
  • the light source unit further includes an arrangement table for arranging the unit light sources toward the display panel,
  • the irradiation range defined by the optical element of the unit light source is wider as the position of the unit light source is closer to the display panel,
  • the unit light source is arranged to be wider as it is closer to the display panel.
  • the light emitting element corresponding to each primary color can take an arbitrary light emitting state in each subframe period.
  • the light source unit is A reflection part that reflects light toward the light control part; Light corresponding to the plurality of areas so that light of a color corresponding to one of the plurality of colors is emitted from the light control unit independently to each of the plurality of areas of the display panel for each subframe period. And a light irradiating part for irradiating the reflecting part.
  • a seventh aspect of the present invention is the sixth aspect of the present invention.
  • the light irradiator is A color wheel for full color white light, And a digital micromirror device capable of switching for each area between an on state in which light from the color wheel is reflected and an off state in which the light is not reflected.
  • the display panel is a liquid crystal panel;
  • the digital micromirror device is turned on in a desired period after the transient response period of the liquid crystal panel in each subframe period.
  • a ninth aspect of the present invention is the eighth aspect of the present invention,
  • the color wheel blocks the white light during a transient response period of the liquid crystal panel.
  • the light source unit emits light to the light control unit so that light of different colors can be emitted from the light control unit independently to each of the plurality of areas of the display panel for each subframe period. It is characterized by irradiating.
  • the light source unit irradiates light to a main surface of the light control unit opposite to a side where the display panel is located.
  • the light source unit irradiates light to a main surface of the light control unit on the side where the display panel is located.
  • a display panel that controls the transmittance of incident light, a light source unit, and the display that is disposed to face the display panel and at least part of the light emitted from the light source unit.
  • a light control unit capable of irradiating the panel and transmitting at least part of light incident from the main surface opposite to the side on which the display panel is located, and includes a plurality of frame periods of a given input signal.
  • a method of driving an image display device that displays a color image by dividing a subframe period and displaying a color corresponding to any of a plurality of colors for each subframe period
  • the light control unit is configured such that the display panel is divided into a plurality of areas, and light of a color corresponding to any of a plurality of colors is emitted from the light control unit independently to each area for each subframe period.
  • the step of irradiating light is provided.
  • a field sequential type image display device that does not require a color filter
  • light of a color corresponding to one of a plurality of colors is independently provided in each area of the display panel for each subframe period. Irradiated. For this reason, display of a desired color can be performed for each area to suppress color breakup. Thereby, the utilization efficiency of light source light (light from the light source unit) can be increased and the deterioration of display quality can be suppressed.
  • a light control unit capable of irradiating at least part of the display panel with light source light and transmitting at least part of light indicating background (hereinafter referred to as “background light”) faces the display panel that does not require a color filter. Provided. Therefore, image display and background transmission can be performed by appropriately controlling the transmittance of incident light in the display panel. In addition, since a case for preventing light source light from leaking to the surroundings is unnecessary, an increase in the size of the image display device can be suppressed.
  • a unit light source including a light emitting element group composed of a plurality of light emitting elements and an optical element that defines an irradiation range of light from the light emitting element group corresponds to one area. For this reason, the same light emitting element group can be used in each unit light source. Thereby, for example, the power consumption of the light emitting element group can be made uniform.
  • a plurality of unit light sources respectively corresponding to a plurality of primary colors correspond to one area.
  • Each unit light source includes a light emitting element corresponding to one primary color and an optical element that defines an irradiation range of light from the light emitting element. Since one light emitting element corresponds to one optical element, for example, when the size of the light emitting element is large, defocusing of the optical element can be suppressed as compared with the second aspect of the present invention.
  • the irradiation range determined by the optical element is wider, and as the unit light source is closer to the display panel, the arrangement interval of the plurality of unit light sources is wider. Independent light irradiation to each area can be performed reliably.
  • the light emitting element corresponding to each primary color can take any light emission state in each subframe period, a desired color obtained by mixing the primary colors in each subframe period. Is emitted to the area of the display panel. For example, in an area where an image is to be displayed, by setting the transmittance of a pixel of a desired color to be relatively high in a subframe period in which the light source light of the desired color is irradiated, color breakup can be reliably suppressed. However, a mixed color display of a plurality of patterns can be performed.
  • the light corresponding to a plurality of areas is reflected by the reflecting portion, so that independent light irradiation to each area can be reliably performed.
  • the light source light of a desired color is irradiated to the area of the display panel. For this reason, there can exist an effect similar to the 5th aspect of this invention.
  • a color wheel and a digital micromirror device capable of switching between an on state and an off state for each area are used.
  • the light source light of a desired color is reliably irradiated to the area of the display panel in each subframe period.
  • the light source light of the desired color can be reliably transmitted in each subframe period. Can be realized.
  • the color wheel blocks white light during the transient response period of the liquid crystal panel, it is possible to more reliably realize light source light of a desired color in each subframe period.
  • the tenth aspect of the present invention it is possible to irradiate different areas with light sources of different colors, so that color breakup can be more reliably performed according to the image to be displayed.
  • the light control unit can be directly irradiated with the light source light, and the same effect as in the first aspect of the present invention can be achieved.
  • the same effect as that of the first aspect of the present invention can be achieved by irradiating the light control unit with the light source light via the display panel.
  • the same effect as in the first aspect of the present invention can be achieved.
  • FIG. 1 is a block diagram illustrating a configuration of an image display device according to a first embodiment of the present invention. It is a figure which shows the structure of the liquid crystal panel shown in FIG. It is a side view which shows the structure of the light source part shown in FIG. It is a top view which shows the structure of the light source part shown in FIG. It is a figure which shows the structure of the unit light source shown to FIG. 3 and FIG. It is a figure for demonstrating the correspondence of the area of the liquid crystal panel in the said 1st Embodiment, and a pixel formation part. It is a side view for demonstrating arrangement
  • FIG. 10 is an enlarged view of the area of interest shown in FIG. 9. It is a figure which shows an example of the color component ratio of each color shown in FIG. It is a figure which shows the structure of the frame period in the said 1st Embodiment. It is a figure which shows the color of each pixel of an attention area. It is a side view for demonstrating arrangement
  • FIG. 1 is a block diagram showing a configuration of an image display apparatus 10 according to the first embodiment of the present invention.
  • the image display device 10 includes a display control circuit 11, a panel drive circuit 12, a light source drive circuit 13, a liquid crystal panel 14, a transparent scattering plate 15, and a light source unit 16.
  • the liquid crystal panel 14 corresponds to a display panel
  • the transparent scattering plate 15 corresponds to a light control unit.
  • the image display device 10 displays an image on the liquid crystal panel 14 by a field sequential method.
  • the field sequential method the color of the light source light is sequentially switched, and data of each color is given to the liquid crystal panel 14 in synchronization with the switching to control the transmission state.
  • the field sequential method in the present embodiment is different from the conventional field sequential method in that additive color mixing using subframes having the same color on the entire screen is not performed.
  • color display can be performed without forming a plurality of subpixels in one pixel as in the conventional field sequential method, so that high resolution can be achieved. Further, it is not necessary to form a color filter in each pixel, and the transmittance of ambient light from the back of the display is improved, so that a transparent display can be configured.
  • the display control circuit 11 receives an input signal IN from the outside, and controls the panel drive circuit 12 and the light source drive circuit 13 based on the input signal IN. More specifically, the display control circuit 11 gives a panel control signal PS for controlling the panel drive circuit 12 to the panel drive circuit 12, and supplies a light source control signal LS for controlling the light source drive circuit 13 to the light source drive circuit 13. To give.
  • the display control circuit 11 includes a subframe image generation unit 21 for converting a frame image indicated by the input signal IN into a subframe image. In other words, the display control circuit 11 divides one frame period of the input signal IN into a plurality of subframe periods by the subframe image generation unit 21.
  • Each of the panel control signal PS and the light source control signal LS includes a signal related to the subframe image generated by the subframe image generation unit 21, various timing signals, and the like.
  • the panel drive circuit 12 drives the liquid crystal panel 14 based on the received panel control signal PS.
  • the light source driving circuit 13 drives the light source unit 16 based on the received light source control signal LS.
  • FIG. 2 is a diagram showing the configuration of the liquid crystal panel 14 shown in FIG.
  • the liquid crystal panel 14 includes a plurality of signal lines SL, a plurality of scanning lines GL, and a plurality of pixel forming portions 141 arranged in a matrix corresponding to the intersections of the plurality of signal lines SL and the plurality of scanning lines GL. Contains.
  • the liquid crystal panel 14 is driven by the panel drive circuit 12 to control the transmittance of incident light in each pixel forming portion 141 (hereinafter, also referred to as “the transmittance of the pixel forming portion 141”).
  • the display method of the liquid crystal panel 14 in the present embodiment may be either a normally black method or a normally white method.
  • the transparent scattering plate 15 is a scattering plate (also referred to as a diffusion plate) whose transparency is increased by suppressing the density of the scatterers.
  • the transparent scattering plate 15 irradiates the liquid crystal panel 14 with the light source light emitted from the light source unit 16, and receives light (corresponding to background light) incident from the main surface opposite to the side where the liquid crystal panel 14 is located. It is comprised so that it can permeate
  • the positional relationship among the transparent scattering plate 15, the liquid crystal panel 14, and the light source unit 16 will be described later.
  • the liquid crystal panel 14 and the transparent scattering plate 15 may be collectively referred to as a “screen portion”.
  • FIG. 3 is a side view of the light source unit 16 shown in FIG.
  • FIG. 4 is a top view of the light source unit 16 shown in FIG.
  • the light source unit 16 includes a plurality of unit light sources 17 and an arrangement table 18 for arranging the plurality of unit light sources 17 toward the screen unit.
  • the liquid crystal panel 14 is divided into a plurality of areas, and a plurality of unit light sources 17 are arranged corresponding to the plurality of areas, respectively. The division of the liquid crystal panel 14 into a plurality of areas will be described later.
  • FIG. 5 is a diagram showing the configuration of the unit light source 17 shown in FIG. 3 and FIG.
  • the unit light source 17 includes a light-emitting element set 171 composed of three light-emitting elements that respectively emit R (red), G (green), and B (blue) light, and a lens that determines an irradiation range of light from the light-emitting element set 171. (Optical element) 173.
  • the light emitting element is, for example, an LED, but may be a CCFL or the like.
  • a light emitting element that emits R light is referred to as an “R light emitting element” and is denoted by reference numeral 172r.
  • a light-emitting element that emits G light is referred to as a “G light-emitting element” and is denoted by reference numeral 172 g.
  • a light-emitting element that emits B light is referred to as a “B light-emitting element” and is denoted by reference numeral 172b.
  • the light emitting element set 171 light emission that emits light of other primary colors instead of the R, G, B light emitting elements 172r, 172g, 172b or together with at least a part of the R, G, B light emitting elements 172r, 172g, 172b.
  • An element may be used.
  • FIG. 6 is a diagram for explaining a correspondence relationship between the area 31 of the liquid crystal panel 14 and the pixel forming portion 141 in the present embodiment.
  • the liquid crystal panel 14 is logically divided into a plurality of areas 31 instead of physically.
  • One area 31 includes a plurality of pixel forming portions 141, and one unit light source 17 corresponds thereto.
  • Such division of the liquid crystal panel 14 into a plurality of areas 31 is performed by the display control circuit 11 based on the input signal IN.
  • the display control circuit 11 divides the liquid crystal panel 14 into a plurality of areas 31 by dividing the frame image indicated by the input signal IN or the subframe image obtained by the subframe image generation unit 21. .
  • the number of areas 31 (hereinafter referred to as “the number of divisions”) is stored in advance in a memory provided inside or outside the display control circuit 11 and is read and used as appropriate.
  • the division number may be obtained by the display control circuit 11 based on the frame image indicated by the input signal IN or the subframe image obtained by the subframe image generation unit 21.
  • the light source control signal LS generated by the display control circuit 11 further includes color data of each pixel in each area 31, for example. Then, the light source unit 16 performs light irradiation independently on each area 31 based on the color data of each pixel in each area 31.
  • FIG. 7 is a side view for explaining the arrangement of the screen unit (the liquid crystal panel 14 and the transparent scattering plate 15) and the light source unit 16 in the present embodiment.
  • FIG. 8 is a top view for explaining the arrangement of the screen unit and the light source unit 16 in the present embodiment.
  • the left side of the figure is the front (refers to the surface on which the viewer of the image displayed on the liquid crystal panel 14 is present).
  • the transparent scattering plate 15 is disposed on the back surface (referred to as a surface opposite to the front surface) of the liquid crystal panel 14 so as to face the liquid crystal panel 14.
  • An air layer or the like may be provided between the liquid crystal panel 14 and the transparent scattering plate 15.
  • the light source unit 16 is disposed obliquely below the back side of the screen unit.
  • the installation method of a screen part and the light source part 16 is not specifically limited.
  • a support part for supporting the screen part may be provided below the screen part.
  • the arrangement interval of the plurality of unit light sources 17 is wider as it is closer to the screen portion.
  • the light irradiation range of the light emitting element set 171 defined by the lens 173 is wider as the position of the unit light source 17 including them is closer to the screen portion.
  • the light source unit 16 can irradiate the transparent scattering plate 15 with light source light so that light is irradiated from the transparent scattering plate 15 independently to each area 31 of the liquid crystal panel 14. ing.
  • the light source unit 16 irradiates the transparent scattering plate 15 with light source light so that the area 31 of the liquid crystal panel 14 is irradiated with light from the transparent scattering plate 15. May be irradiated.
  • the surface on which the plurality of unit light sources 17 are disposed hereinafter referred to as “arrangement surface” and the main surface of the screen portion form an acute angle.
  • the transparent scattering plate 15 is irradiated with light source light from the back surface (the main surface opposite to the side where the liquid crystal panel 14 is located).
  • the light source light applied to the transparent scattering plate 15 is scattered by the transparent scattering plate 15.
  • a component of the scattered light source light toward the liquid crystal panel 14 is irradiated to the liquid crystal panel 14.
  • a part of the light source light applied to the transparent scattering plate 15 passes through the transparent scattering plate 15, but the light source light is applied from an oblique lower side on the back side of the screen portion to an oblique upper side on the front side of the screen portion. Therefore, the light source light transmitted through the transparent scattering plate 15 does not affect the display (see FIG. 7).
  • the angle formed by the arrangement surface of the arrangement table 18 and the screen portion is close to 90 ° within the range in which the transparent scattering plate 15 can be irradiated with the light source light. desirable.
  • background light is incident on the transparent scattering plate 15 from the back side.
  • the background light incident on the transparent scattering plate 15 is irradiated to the liquid crystal panel 14 by being transmitted.
  • a part of the background light incident on the transparent scattering plate 15 is scattered by the transparent scattering plate 15, but the density of scatterers of the transparent scattering plate 15 is suppressed as described above. For this reason, the influence of the scattering of the background light by the transparent scattering plate 15 on the visual recognition of the background is small.
  • image display portion a portion where an image is to be displayed (hereinafter referred to as “image display portion”) and a portion where an image is not displayed (hereinafter referred to as “image non-display portion”) on the liquid crystal panel 14 are input to the input signal IN by the display control circuit 11.
  • image display portion displays an image based on the light source light by appropriately controlling the transmittance.
  • the background light is also incident on the image display unit.
  • the luminance of the light source light to be relatively high, the influence of the background light incident on the image display unit on the image display can be suppressed. . Note that it is possible to intentionally set the luminance of the light source light to be low and display the image with a background watermark.
  • the background light transmitted through the transparent scattering plate 15 is further transmitted by setting the transmittance to be relatively high. In this way, the background is transmitted.
  • the image non-display portion may be set for each area 31 or for each pixel.
  • the light source unit 16 is arranged so as not to overlap the screen unit in the horizontal direction so that the back of the screen unit does not block the background light. According to such an arrangement, background transmission can be performed more reliably.
  • FIG. 9 is a diagram illustrating an example of a display image in the present embodiment.
  • Each rectangular block in FIG. 9 corresponds to the area 31.
  • attention is focused on an area surrounded by a thick line (hereinafter referred to as “focused area” and indicated by reference numeral 32).
  • FIG. 10 is an enlarged view of the area of interest 32 shown in FIG.
  • the image of the target area 32 portion (hereinafter referred to as “target area image”) includes first to fourth colors ⁇ , ⁇ , ⁇ , and ⁇ .
  • Each of the first to fourth colors ⁇ , ⁇ , ⁇ , and ⁇ is realized by a desired color component ratio of R, G, and B. Note that the number of colors and the types of colors included differ for each area 31. However, there may be two or more areas 31 having the same number of colors and the same kind of color.
  • FIG. 11 is a diagram showing an example of the color component ratio of each of the first to fourth colors ⁇ , ⁇ , ⁇ , and ⁇ .
  • the color component ratio indicates a relative relationship between the sizes of the R component, the G component, and the B component, and does not indicate the size (component value) of each color component. Therefore, in the example shown in FIG. 11, the R component of the first color ⁇ is not necessarily larger than the R component of the second color ⁇ .
  • FIG. 12 is a diagram showing the configuration of the frame period in the present embodiment.
  • one frame period is composed of four subframe periods (first to fourth subframe periods).
  • the light emitting elements of the respective colors included in the unit light source 17 can take an arbitrary state. For this reason, only the light emitting element of any one of R, G, and B may be lit, or the light emitting elements of a plurality of colors may be lit. Also, the R, G, and B light emitting elements 172r, 172g, and 172b may have different light emission intensities. Therefore, the light source unit 16 can independently irradiate each area 31 of the liquid crystal panel 14 with light source light of a color realized with a desired color component ratio in each subframe period.
  • FIG. 13 is a diagram showing the color of each pixel in the area of interest 32.
  • the area of interest 32 includes 25 pixels (5 in the X-axis direction and 5 in the Y-axis direction).
  • the first to fourth colors ⁇ , ⁇ , ⁇ , and ⁇ are required for the attention area image.
  • the positions of the pixels of each color in FIG. 13 and the pixels of each color in FIG. 10 do not match.
  • the target area 32 is irradiated with light source light of the first to fourth colors ⁇ , ⁇ , ⁇ , and ⁇ in the first to fourth subframe periods, respectively.
  • the pixel formation portion 141 where the pixel of the first color ⁇ is to be formed is set to a transmissive state (which means a state with relatively high transmittance), and other colors
  • the pixel forming portion 141 that should form the pixel is set in a shielding state (a state in which the transmittance is zero or a state close to zero).
  • the pixel formation unit 141 that should form pixels of the second color ⁇ is set in a transmissive state, and the pixel formation unit 141 that should form pixels of other colors is set in a shielding state.
  • the pixel formation unit 141 that should form pixels of the third color ⁇ is set in a transmissive state, and the pixel formation unit 141 that should form pixels of other colors is set in a shielding state.
  • the pixel formation unit 141 that should form the pixels of the fourth color ⁇ is set to the transmissive state, and the pixel formation unit 141 that should form the pixels of the other colors is set to the shielding state. . In this manner, a frame image composed of the first to fourth colors ⁇ , ⁇ , ⁇ , ⁇ is realized in one frame period.
  • the type of color of the light source light and the order of the colors in the first to fourth subframe periods differ from one area 31 to another. Further, in each area 31, when the required number of colors is smaller than the number of subframe periods, the color components of R, G, B, for example, are equal except in the subframe period for displaying the necessary colors. As described above, the light emitting elements of the respective colors may be turned on.
  • unit light source 17 including a light emitting element set 171 including R, G, B light emitting elements 172r, 172g, and 172b and a lens 173 that defines an irradiation range of light from the light emitting element set 171. Corresponds to the area. For this reason, the same light emitting element group 171 can be used in each unit light source 17. Thereby, for example, the power consumption of the light emitting element group 171 can be made uniform.
  • the unit light source 17 As the unit light source 17 is closer to the screen portion, the light irradiation range of the light emitting element group 171 determined by the lens 173 becomes wider, and as the unit light source is closer to the screen portion, the arrangement of the plurality of unit light sources 17 is arranged. Since the interval is wide, independent light irradiation to each area 31 can be performed more reliably.
  • FIG. 14 is a side view for explaining the arrangement of the screen unit (the liquid crystal panel 14 and the transparent scattering plate 15) and the light source unit 16 in the present embodiment.
  • FIG. 15 is a top view for explaining the arrangement of the screen unit and the light source unit 16 in the present embodiment.
  • the left side of the figure is the front as in FIGS. 7 and 8 described above.
  • the transparent scattering plate 15 is disposed on the back side of the liquid crystal panel 14 so as to face the liquid crystal panel 14.
  • the light source unit 16 is disposed obliquely below the front side of the screen unit.
  • the transparent scattering plate 15 is irradiated with light source light from the front through the liquid crystal panel 14. For this reason, the light source light irradiated to the transparent scattering plate 15 is scattered by the transparent scattering plate 15, and the component of the scattered light source light toward the liquid crystal panel 14 is irradiated to the liquid crystal panel 14.
  • the light source unit 16 since the light source unit 16 is disposed obliquely below the front side of the screen unit, the influence of the light source light transmitted through the transparent scattering plate 15 on the display is affected. Can be reliably suppressed.
  • the background transmission is the same as that in the first embodiment, and a description thereof will be omitted.
  • the transparent scattering plate 15 can be irradiated with the light source light via the liquid crystal panel 14, and the same effect as the first embodiment can be obtained.
  • the transparent scattering plate 15 is used as the light control unit.
  • a half mirror may be used instead of the transparent scattering plate 15.
  • half of the light source light irradiated to the half mirror meaning that the light amount is half
  • the liquid crystal panel 14 is irradiated. Therefore, the same effect as when the transparent scattering plate 15 is used can be obtained.
  • FIG. 16 is a diagram showing a configuration of the unit light source 17 in the third embodiment of the present invention.
  • the same elements as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
  • three unit light sources 17 respectively corresponding to R, G, and B correspond to one area 31.
  • the unit light source 17 corresponding to R is referred to as “R unit light source” and is represented by reference numeral 17r.
  • the unit light source 17 corresponding to G is referred to as a “G unit light source” and is represented by reference numeral 17g.
  • the unit light source 17 corresponding to B is referred to as a “B unit light source” and is represented by reference numeral 17b.
  • the unit light sources 17 corresponding to other primary colors may be used in place of the R, G, B unit light sources 17r, 17g, 17b or together with at least a part of the R, G, B unit light sources 17r, 17g, 17b. good.
  • FIG. 16 illustrates the R unit light source 17r among the R, G, B unit light sources 17r, 17g, and 17b.
  • the R unit light source 17r includes an R light emitting element 172r and a lens 173 that defines an irradiation range of light from the R light emitting element 172r.
  • the G and B unit light sources 17g and 17b have the same configuration as that of the R unit light source 17r except that the primary colors are different, and thus the description thereof is omitted.
  • FIG. 17 is a diagram for explaining light irradiation from the R, G, B unit light sources 17r, 17g, and 17b to the area 31 in the present embodiment.
  • Each of the R, G, B unit light sources 17r, 17g, 17b irradiates the corresponding area 31 with light. Since the state of each color light emitting element in each subframe period is the same as that in the first embodiment, the description thereof is omitted.
  • the arrangement of the unit light sources 17 in this embodiment is basically the same as that in the first and second embodiments.
  • the R, G, B unit light sources 17r, 17g, and 17b corresponding to each area 31 may be arranged side by side in a direction (vertical direction in FIG. 8 or FIG. 15) orthogonal to the thickness direction of the screen portion. May be arranged side by side in the thickness direction (lateral direction in FIG. 8 or FIG. 15).
  • positioning of the screen part and the light source part 16 in this embodiment you may employ
  • one area 31 corresponds to the R, G, B unit light sources 17r, 17g, and 17b.
  • Each of the R, G, B unit light sources 17r, 17g, 17b includes a light emitting element and a lens 173 corresponding to the primary color. Since one light emitting element and one lens 173 correspond to each other, for example, when the size of the light emitting element is large, it is possible to suppress the defocus of the lens 173 compared to the first and second embodiments.
  • FIG. 18 is a side view for explaining the arrangement of the screen unit (the liquid crystal panel 14 and the transparent scattering plate 15) and the light source unit 16 in the fourth embodiment of the present invention.
  • FIG. 19 is a top perspective view of the light source unit 16 shown in FIG. In FIGS. 18 and 19, it is assumed that the left side of the figure is the front surface as in FIGS. 7 and 8 described above.
  • the same elements as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
  • the transparent scattering plate 15 is disposed on the back side of the liquid crystal panel 14 so as to face the liquid crystal panel 14.
  • the light source unit 16 is disposed below the screen unit.
  • a support portion 19 for supporting the screen portion is provided between the light source portion 16 and the screen portion.
  • the support portion 19 is not essential, and the positional relationship between the light source portion 16 and the screen portion in the present embodiment may be realized by other methods.
  • the light source unit 16 includes a lamp 41, a color wheel 42, a condenser lens 43, a digital micromirror device (DMD) 44, a projection lens 45, and a rising mirror 46.
  • the lamp 41, the color wheel 42, the condenser lens 43, the DMD 44, and the projection lens 45 realize a light irradiation unit
  • the rising mirror 46 realizes a reflection unit.
  • the lamp 41 is a lamp that emits white light, for example, a halogen lamp.
  • White light emitted from the lamp 41 is made full color by the color wheel 42, collected by the condenser lens 43, and then irradiated to the DMD 44.
  • the color wheel 42 rotates based on a desired frequency in order to switch R, G, and B light at high speed and irradiate the DMD 44 via the condenser lens 43.
  • R light emitting element, G light emitting element, and B light emitting element that can switch the light emitting state in a time division manner are used instead of the halogen lamp and color wheel 42. You may do it.
  • the light irradiated on the DMD 44 is irradiated on the projection lens 45 by being reflected by the DMD 44 when the DMD 44 is in the ON state.
  • the light irradiated on the DMD 44 is absorbed inside and is not irradiated on the projection lens 45.
  • the DMD 44 can switch between the on state and the off state for each area 31.
  • the desired color component ratio of R, G, B as in the first embodiment is adjusted for each area 31 by adjusting the ON / OFF state period of the DMD 44 for each area 31.
  • each subframe period it can be realized in a time division manner. In this way, by appropriately setting the lighting time ratio of each primary color for each area 31, it is possible to realize light source light of a desired color in each subframe period. A further description of the operation in one subframe period in the present embodiment will be described later.
  • the projection lens 45 irradiates the mirror 46 with the light emitted from the plurality of DMDs 44. Since the raising mirror 46 is arranged toward the screen portion as shown in FIG. 18, the light emitted from the projection lens 45 is applied to the transparent scattering plate 15 as light source light.
  • the light source unit 16 in the present embodiment has the same configuration as that of a digital light processing (DLP) projector.
  • the light source unit 16 may have the same configuration as other projectors such as a liquid crystal display (LCD) projector.
  • LCD liquid crystal display
  • the operation of transmitting and scattering light source light by the transparent scattering plate 15 is the same as in the first and second embodiments.
  • FIG. 20 is a diagram for explaining the operation in one subframe period in the present embodiment.
  • FIG. 20 shows the transmitted light color of the color wheel 42 and the state of the DMD 44 in one subframe period.
  • One subframe period is divided into a transient response period of the liquid crystal panel 14 (hereinafter referred to as “liquid crystal transient response period”) and a period after the end of the transient response period of the liquid crystal panel 14 (hereinafter referred to as “liquid crystal response completion period”).
  • liquid crystal transient response period the transmittance of the pixel formation portion 141 of the liquid crystal panel 14 changes toward a desired value
  • the transmittance of the pixel formation portion 141 becomes a desired value.
  • the color wheel 42 blocks white light from the lamp 41 during the liquid crystal transient response period (it can also be said that the transmitted light color is black (K)), and R, G during the liquid crystal response completion period. , B are sequentially applied to the DMD 44.
  • the color order of the light applied to the DMD 44 is not particularly limited.
  • the DMD 44 maintains an off state during the liquid crystal transient response period, and turns on during a desired period during the liquid crystal response completion period. In this way, light source light of a desired color is realized.
  • FIG. 20 illustrates an implementation example of the first color ⁇ described above.
  • the light emitting unit (the lamp 41, the color wheel 42, the condensing lens 43, the DMD 44, and the projection lens 45) irradiates the rising mirror 46 with the light source light corresponding to the plurality of areas 31, By reflecting the light source light corresponding to the plurality of areas 31 toward the transparent scattering plate 15 to the rising mirror 46, it corresponds to one of a plurality of colors for each subframe period as in the first embodiment.
  • the color light source light is irradiated to each of the areas 31 of the liquid crystal panel 14 independently. In this way, the same effects as those of the first embodiment can be obtained.
  • the color wheel 42 and the DMD 44 that can be switched between the on state and the off state for each area 31 are used.
  • the light source light of a desired color is reliably irradiated to the area 31 in each subframe period.
  • the lighting time ratio of each primary color can be appropriately set in consideration of the liquid crystal transient response period, so that the light source light of a desired color can be reliably realized in each subframe period. it can.
  • the color wheel 42 blocks the white light from the lamp 41 during the liquid crystal transient response period, the light source light of a desired color can be more reliably realized in each subframe period. .
  • the image display in this embodiment and the image display by the conventional projector differ in the following points. That is, if an image is projected from a conventional projector onto a general screen at a close distance, focusing becomes difficult and display quality is deteriorated.
  • the image is not projected from the light source unit 16 but is irradiated with the light source light, and the image is displayed by performing the transmittance control on the liquid crystal panel 14. There is no need to do. For this reason, in this embodiment, even if the light source unit 16 is arranged at a close distance of the screen unit, the display quality is not deteriorated.
  • the image display device 10 only needs to be configured to suppress color breakup by irradiating each area 31 with light source light independently, and a desired color can be obtained in each subframe period. It is not essential to irradiate the light source light.
  • a polymer dispersed liquid crystal (Polymer Dispersed Liquid Crystal: PDLC) panel may be used instead of the transparent scattering plate 15.
  • the PDLC panel when the image is displayed, the PDLC panel is set in a scattering state, and when the background is transmitted, the PDLC panel is set in a transmissive state, whereby image display and background transmission can be performed with higher quality.
  • a part of the PDLC panel may be in a scattering state, and the remaining part may be in a transmissive state.
  • the PDLC panel functions as a light control unit that irradiates part of the light source light onto the liquid crystal panel 14 and transmits part of the background light.
  • the number of unit light sources 17 may be made larger than the number of areas 31 and two or more unit light sources 17 may correspond to one area 31.
  • the lens 173 instead of the lens 173, another optical element that can determine the irradiation range of light from the light emitting element set 171 (light emitting element) may be used.
  • the transparent scattering plate 15 may be irradiated with light source light via the liquid crystal panel 14.
  • a half mirror or the like may be used instead of the transparent scattering plate 15.
  • the light source unit 16 may be disposed obliquely above the screen unit rear side. Moreover, in the said 2nd Embodiment, you may make it arrange

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Abstract

Provided is an image display device capable of improving the efficiency of use of light source light and transmitting a background while suppressing a decrease in display quality and an increase in size. The image display device includes a liquid crystal panel (14), a transparent scattering plate (15) facing the liquid crystal panel (14), and a light source unit (16) positioned diagonally downward on a rear surface side of the liquid crystal panel (14) and the transparent scattering plate (15). The light source unit (16) includes a plurality of unit light sources (17) corresponding to each of a plurality of areas of the liquid crystal panel (14). Light entering from the rear surface of the transparent scattering plate (15) is scattered and directed onto the liquid crystal panel (14). Light entering from the rear surface of the transparent scattering plate (15) is also transmitted and directed onto the liquid crystal panel (14). In an image display area, the transmittance is appropriately controlled, whereby an image is displayed on the basis of the light source light. At an image non-display area, the transmittance is set so as to be relatively high, and a background is thereby transmitted.

Description

画像表示装置およびその駆動方法Image display device and driving method thereof
　本発明は、画像表示装置に関し、特に、フィールドシーケンシャル方式で駆動される画像表示装置およびその駆動方法に関する。 The present invention relates to an image display device, and more particularly to an image display device driven by a field sequential method and a driving method thereof.
　近年、カラー画像を表示する画像表示装置の駆動方式の１つとして、フィールドシーケンシャル方式の開発が進められている。フィールドシーケンシャル方式は、バックライト光となる赤色（Ｒ）、緑色（Ｇ）、および青色（Ｂ）の発光ダイオード（Light Emitting Diode：ＬＥＤ）や冷陰極管（Cold Cathode Fluorescent Lamp：ＣＣＦＬ）などの発光素子を順に切り換えると共に、その切り換えと同期して液晶パネルに各発光素子の光の色に対応する色のデータを順に与えて液晶パネルの透過状態を制御することによって、観察者の網膜上で加法混色を行う方式である。フィールドシーケンシャル方式によれば、１つの画素に複数の副画素を形成することなくカラー表示ができるので、高解像度化が可能になる。また、これらの発光素子からの光をそのまま利用することができるので、各画素にカラーフィルタを形成する必要がなくなり、各発光素子の光の利用効率が向上する。このようなフィールドシーケンシャル方式に関する技術は、例えば日本の特開２０００－１２２５８９号公報などに開示されている。 In recent years, a field sequential method has been developed as one of driving methods for an image display device that displays a color image. The field sequential method is a light emitting diode (Light Emitting Diode: LED) or a cold cathode tube (Cold Cathode Fluorescent Lamp: CCFL) that emits backlight. The elements are switched in order, and in synchronization with the switching, color data corresponding to the light color of each light-emitting element is sequentially given to the liquid crystal panel to control the transmission state of the liquid crystal panel, thereby adding on the observer's retina. This is a method of mixing colors. According to the field sequential method, color display can be performed without forming a plurality of sub-pixels in one pixel, so that high resolution can be achieved. In addition, since the light from these light emitting elements can be used as they are, it is not necessary to form a color filter in each pixel, and the light use efficiency of each light emitting element is improved. A technique related to such a field sequential method is disclosed in Japanese Unexamined Patent Publication No. 2000-122589, for example.
　また、近年、画像表示を行うと共に背景の透過が可能な画像表示装置の開発が進められている。例えば、日本の特開２０１０－９１６０９号公報には、液晶パネル、シャッタフィルム、制御部、光源、ケース、および観察物体などを備えた液晶表示装置が開示されている。光源および観察物体はケース内部に設けられている。シャッタフィルムは、透明な状態である第１状態と、不透明な状態（白濁した状態）である第２状態とを制御部によって切り替え可能となっている。シャッタフィルムの状態を制御することにより、画像表示および背景透過（観察物体の表示）が可能となる。 In recent years, development of an image display device capable of displaying an image and transmitting a background has been advanced. For example, Japanese Unexamined Patent Application Publication No. 2010-91609 discloses a liquid crystal display device including a liquid crystal panel, a shutter film, a control unit, a light source, a case, and an observation object. The light source and the observation object are provided inside the case. The shutter film can be switched between a first state which is a transparent state and a second state which is an opaque state (a cloudy state) by the control unit. By controlling the state of the shutter film, image display and background transmission (observation object display) are possible.
日本の特開２０００－１２２５８９号公報Japanese Unexamined Patent Publication No. 2000-122589 日本の特開２０１０－９１６０９号公報Japanese Unexamined Patent Publication No. 2010-91609 日本の特許第４５８６３３２号公報Japanese Patent No. 4586332
　ところで、日本の特開２０１０－９１６０９号公報に開示された構成において、カラー表示を行うためには、液晶パネルにカラーフィルタを設けるか、またはフィールドシーケンシャル方式の駆動を行う必要がある。しかし、液晶パネルにカラーフィルタを設けるとすると、各発光素子の光の利用効率が低下し、また、背景を充分に透過することができない。なお、第１状態と第２状態とを切り替え可能なシャッタフィルムとカラーフィルタとを使用した構成は、例えば日本の特許第４５８６３３２号公報に開示されている。このような構成においても、日本の特開２０１０－９１６０９号公報に開示された構成でカラーフィルタを設けた場合と同様の問題が生じ得る。また、日本の特開２０１０－９１６０９号公報に開示された構成では、ケース内部で光源からの光（以下「光源光」という。）が拡散するので、フィールドシーケンシャル方式の駆動を行うとすると、画面全体で同じ色の表示を行うことになる。フィールドシーケンシャル方式においては、画面全体で色を切り替えると色割れが生じやすいことが知られている。図２１は、色割れの発生原理を示す図である。図２１のＡ部において、縦軸は時間を表し、横軸は画面上の位置を表す。一般に、表示画面内を物体が移動したとき、観測者の視線は物体を追随して物体の移動方向に移動する。例えば図２１に示す例では、白色物体が表示画面内を左から右へ移動したとき、観測者の視線は斜め矢印方向に移動する。一方、１フレーム期間内では、Ｒ，Ｇ，Ｂのそれぞれのサブフレーム画像において物体の位置は同じである。このため、図２１のＢ部に示すように、網膜に映る映像には色割れが発生する。以上のように、日本の特開２０１０－９１６０９号公報に開示された構成でフィールドシーケンシャル方式の駆動を行うと、表示品位が低下する。さらに、日本の特開２０１０－９１６０９号公報に開示された構成では、光源光を周囲に漏らさないために上記ケースが必要になるので、画像表示装置のサイズが増大する。 By the way, in the configuration disclosed in Japanese Unexamined Patent Publication No. 2010-91609, in order to perform color display, it is necessary to provide a color filter on the liquid crystal panel or to perform field sequential driving. However, if a color filter is provided in the liquid crystal panel, the light use efficiency of each light emitting element is lowered and the background cannot be sufficiently transmitted. A configuration using a shutter film and a color filter capable of switching between the first state and the second state is disclosed in, for example, Japanese Patent No. 4586332. Even in such a configuration, the same problem as in the case where a color filter is provided in the configuration disclosed in Japanese Unexamined Patent Publication No. 2010-91609 may occur. Further, in the configuration disclosed in Japanese Patent Application Laid-Open No. 2010-91609, light from the light source (hereinafter referred to as “light source light”) diffuses inside the case. Therefore, when the field sequential driving is performed, the screen The same color is displayed as a whole. In the field sequential method, it is known that color breaks easily occur when colors are switched over the entire screen. FIG. 21 is a diagram illustrating the principle of occurrence of color breakup. In FIG. 21A, the vertical axis represents time, and the horizontal axis represents the position on the screen. Generally, when an object moves in the display screen, the observer's line of sight follows the object and moves in the moving direction of the object. For example, in the example shown in FIG. 21, when the white object moves from left to right in the display screen, the observer's line of sight moves in the direction of the oblique arrow. On the other hand, the position of the object is the same in each of the R, G, and B subframe images within one frame period. For this reason, as shown in part B of FIG. 21, color breakup occurs in the image shown on the retina. As described above, when the field sequential driving is performed with the configuration disclosed in Japanese Unexamined Patent Publication No. 2010-91609, the display quality is deteriorated. Furthermore, in the configuration disclosed in Japanese Patent Application Laid-Open No. 2010-91609, the above-described case is necessary to prevent light source light from leaking to the surroundings, and thus the size of the image display device increases.
　そこで、本発明は、表示品位の低下およびサイズの増大を抑制しつつ、光源光の利用効率を高め且つ背景を透過することができる画像表示装置およびその駆動方法を提供することを目的とする。 Therefore, an object of the present invention is to provide an image display device and a driving method thereof that can improve the efficiency of use of light source light and transmit the background while suppressing deterioration in display quality and increase in size.
　本発明の第１の局面は、与えられた入力信号の１フレーム期間を複数のサブフレーム期間に分割し、サブフレーム期間毎に複数色のいずれかに対応した色の表示を行うことによりカラー画像を表示する画像表示装置であって、
　入射した光の透過率を制御する表示パネルと、
　光源部と、
　前記表示パネルに対向して配置され、前記光源部が出射した光の少なくとも一部の前記表示パネルへの照射および前記表示パネルが位置する側と反対側の主面から入射した光の少なくとも一部の透過が可能な光制御部とを備え、
　前記光源部は、前記サブフレーム期間毎に複数色のいずれかに対応した色の光が前記表示パネルの複数のエリアのそれぞれに独立して前記光制御部から照射されるように、前記光制御部に光を照射することを特徴とする。 A first aspect of the present invention divides one frame period of a given input signal into a plurality of subframe periods, and displays a color image corresponding to one of a plurality of colors for each subframe period. An image display device for displaying
A display panel for controlling the transmittance of incident light;
A light source unit;
Irradiation of at least a part of the light emitted from the light source unit, which is arranged facing the display panel, to the display panel and at least a part of the light incident from the main surface opposite to the side where the display panel is located A light control unit capable of transmitting
The light source unit controls the light control so that light of a color corresponding to one of a plurality of colors is emitted from the light control unit independently to each of the plurality of areas of the display panel for each subframe period. It is characterized by irradiating the part with light.
　本発明の第２の局面は、本発明の第１の局面において、
　前記光源部は、前記複数のエリアにそれぞれ対応した複数の単位光源を含み、
　前記単位光源は、
　　複数の原色にそれぞれ対応した複数の発光素子からなる発光素子組と、
　　前記発光素子組からの光の照射範囲を定める光学素子とを含むことを特徴とする。 According to a second aspect of the present invention, in the first aspect of the present invention,
The light source unit includes a plurality of unit light sources respectively corresponding to the plurality of areas,
The unit light source is
A light-emitting element group composed of a plurality of light-emitting elements respectively corresponding to a plurality of primary colors;
And an optical element that defines an irradiation range of light from the light emitting element group.
　本発明の第３の局面は、本発明の第１の局面において、
　前記光源部は、各エリアに対応すると共に、複数の原色にそれぞれ対応した複数の単位光源を含み、
　各原色に対応した単位光源は、
　　当該原色に対応した発光素子と、
　　前記発光素子からの光の照射範囲を定める光学素子とを含むことを特徴とする。 According to a third aspect of the present invention, in the first aspect of the present invention,
The light source unit includes a plurality of unit light sources corresponding to each area and corresponding to a plurality of primary colors,
The unit light source corresponding to each primary color is
A light emitting device corresponding to the primary color;
And an optical element that defines an irradiation range of light from the light emitting element.
　本発明の第４の局面は、本発明の第２の局面または第３の局面において、
　前記光源部は、前記単位光源を前記表示パネルに向けて配置するための配置台をさらに含み、
　前記単位光源の前記光学素子が定める前記照射範囲は、当該単位光源の位置が前記表示パネルに近いほど広く、
　前記単位光源の配置間隔は、前記表示パネルに近いほど広いことを特徴とする。 According to a fourth aspect of the present invention, in the second aspect or the third aspect of the present invention,
The light source unit further includes an arrangement table for arranging the unit light sources toward the display panel,
The irradiation range defined by the optical element of the unit light source is wider as the position of the unit light source is closer to the display panel,
The unit light source is arranged to be wider as it is closer to the display panel.
　本発明の第５の局面は、本発明の第２の局面または第３の局面において、
　各原色に対応した発光素子は、各サブフレーム期間で任意の発光状態を取り得ることを特徴とする。 According to a fifth aspect of the present invention, in the second aspect or the third aspect of the present invention,
The light emitting element corresponding to each primary color can take an arbitrary light emitting state in each subframe period.
　本発明の第６の局面は、本発明の第１の局面において、
　前記光源部は、
　　前記光制御部に向けて光を反射する反射部と、
　　前記サブフレーム期間毎に複数色のいずれかに対応した色の光が前記表示パネルの複数のエリアのそれぞれに独立して前記光制御部から照射されるように、前記複数のエリアに対応する光を前記反射部に照射する光照射部とを含むことを特徴とする。 According to a sixth aspect of the present invention, in the first aspect of the present invention,
The light source unit is
A reflection part that reflects light toward the light control part;
Light corresponding to the plurality of areas so that light of a color corresponding to one of the plurality of colors is emitted from the light control unit independently to each of the plurality of areas of the display panel for each subframe period. And a light irradiating part for irradiating the reflecting part.
　本発明の第７の局面は、本発明の第６の局面において、
　前記光照射部は、
　　白色光をフルカラー化するためのカラーホイールと、
　　前記カラーホイールからの光を反射するオン状態と当該光を反射しないオフ状態とを前記エリア毎に切り替え可能なデジタルマイクロミラーデバイスとを含むことを特徴とする。 A seventh aspect of the present invention is the sixth aspect of the present invention,
The light irradiator is
A color wheel for full color white light,
And a digital micromirror device capable of switching for each area between an on state in which light from the color wheel is reflected and an off state in which the light is not reflected.
　本発明の第８の局面は、本発明の第７の局面において、
　前記表示パネルは液晶パネルであり、
　前記デジタルマイクロミラーデバイスは、各サブフレーム期間において、前記液晶パネルの過渡応答期間終了後の所望の期間にオン状態になることを特徴とする。 According to an eighth aspect of the present invention, in the seventh aspect of the present invention,
The display panel is a liquid crystal panel;
The digital micromirror device is turned on in a desired period after the transient response period of the liquid crystal panel in each subframe period.
　本発明の第９の局面は、本発明の第８の局面において、
　前記カラーホイールは、前記液晶パネルの過渡応答期間において前記白色光を遮断することを特徴とする。 A ninth aspect of the present invention is the eighth aspect of the present invention,
The color wheel blocks the white light during a transient response period of the liquid crystal panel.
　本発明の第１０の局面は、本発明の第１の局面において、
　前記光源部は、前記サブフレーム期間毎に、異なるエリアに異なる色の光が前記表示パネルの複数のエリアのそれぞれに独立して前記光制御部から照射可能なように、前記光制御部に光を照射することを特徴とする。 According to a tenth aspect of the present invention, in the first aspect of the present invention,
The light source unit emits light to the light control unit so that light of different colors can be emitted from the light control unit independently to each of the plurality of areas of the display panel for each subframe period. It is characterized by irradiating.
　本発明の第１１の局面は、本発明の第１の局面において、
　前記光源部は、前記表示パネルが位置する側と反対側の前記光制御部の主面に光を照射することを特徴とする。 According to an eleventh aspect of the present invention, in the first aspect of the present invention,
The light source unit irradiates light to a main surface of the light control unit opposite to a side where the display panel is located.
　本発明の第１２の局面は、本発明の第１の局面において、
　前記光源部は、前記表示パネルが位置する側の前記光制御部の主面に光を照射することを特徴とする。 According to a twelfth aspect of the present invention, in the first aspect of the present invention,
The light source unit irradiates light to a main surface of the light control unit on the side where the display panel is located.
　本発明の第１３の局面は、入射した光の透過率を制御する表示パネルと、光源部と、前記表示パネルに対向して配置され、前記光源部が出射した光の少なくとも一部の前記表示パネルへの照射および前記表示パネルが位置する側と反対側の主面から入射した光の少なくとも一部の透過が可能な光制御部とを含み、与えられた入力信号の１フレーム期間を複数のサブフレーム期間に分割し、サブフレーム期間毎に複数色のいずれかに対応した色の表示を行うことによりカラー画像を表示する画像表示装置の駆動方法であって、
　前記表示パネルを複数のエリアに分割し、前記サブフレーム期間毎に複数色のいずれかに対応した色の光が各エリアに独立して前記光制御部から照射されるように、前記光制御部に光を照射するステップを備えることを特徴とする。 According to a thirteenth aspect of the present invention, there is provided a display panel that controls the transmittance of incident light, a light source unit, and the display that is disposed to face the display panel and at least part of the light emitted from the light source unit. A light control unit capable of irradiating the panel and transmitting at least part of light incident from the main surface opposite to the side on which the display panel is located, and includes a plurality of frame periods of a given input signal. A method of driving an image display device that displays a color image by dividing a subframe period and displaying a color corresponding to any of a plurality of colors for each subframe period,
The light control unit is configured such that the display panel is divided into a plurality of areas, and light of a color corresponding to any of a plurality of colors is emitted from the light control unit independently to each area for each subframe period. The step of irradiating light is provided.
　本発明の第１の局面によれば、カラーフィルタ不要のフィールドシーケンシャル方式の画像表示装置において、サブフレーム期間毎に複数色のいずれかに対応した色の光が表示パネルの各エリアに独立して照射される。このため、所望の色の表示をエリア毎に行って色割れを抑制することができる。これにより、光源光（光源部からの光）の利用効率を高め且つ表示品位の低下を抑制することができる。また、光源光の少なくとも一部の表示パネルへの照射および背景を示す光（以下「背景光」という。）の少なくとも一部の透過が可能な光制御部がカラーフィルタ不要の表示パネルに対向して設けられる。したがって、表示パネルにおいて入射光の透過率を適切に制御することにより、画像表示および背景透過を行うことができる。また、光源光を周囲に漏らさないためのケースが不要であるので、画像表示装置のサイズの増大を抑制することができる。 According to the first aspect of the present invention, in a field sequential type image display device that does not require a color filter, light of a color corresponding to one of a plurality of colors is independently provided in each area of the display panel for each subframe period. Irradiated. For this reason, display of a desired color can be performed for each area to suppress color breakup. Thereby, the utilization efficiency of light source light (light from the light source unit) can be increased and the deterioration of display quality can be suppressed. A light control unit capable of irradiating at least part of the display panel with light source light and transmitting at least part of light indicating background (hereinafter referred to as “background light”) faces the display panel that does not require a color filter. Provided. Therefore, image display and background transmission can be performed by appropriately controlling the transmittance of incident light in the display panel. In addition, since a case for preventing light source light from leaking to the surroundings is unnecessary, an increase in the size of the image display device can be suppressed.
　本発明の第２の局面によれば、複数の発光素子からなる発光素子組および当該発光素子組からの光の照射範囲を定める光学素子を含む単位光源が１つのエリアに対応する。このため、各単位光源において同様の発光素子組を使用することができる。これにより、例えば発光素子組の消費電力の均一化などを図ることができる。 According to the second aspect of the present invention, a unit light source including a light emitting element group composed of a plurality of light emitting elements and an optical element that defines an irradiation range of light from the light emitting element group corresponds to one area. For this reason, the same light emitting element group can be used in each unit light source. Thereby, for example, the power consumption of the light emitting element group can be made uniform.
　本発明の第３の局面によれば、１つのエリアに、複数の原色にそれぞれ対応した複数の単位光源が対応する。各単位光源は、１つの原色に対応した発光素子および当該発光素子からの光の照射範囲を定める光学素子を含む。１つの発光素子と１つの光学素子とが対応しているので、例えば発光素子サイズが大きい場合、本発明の第２の局面に比べて、光学素子の焦点ずれを抑制することができる。 According to the third aspect of the present invention, a plurality of unit light sources respectively corresponding to a plurality of primary colors correspond to one area. Each unit light source includes a light emitting element corresponding to one primary color and an optical element that defines an irradiation range of light from the light emitting element. Since one light emitting element corresponds to one optical element, for example, when the size of the light emitting element is large, defocusing of the optical element can be suppressed as compared with the second aspect of the present invention.
　本発明の第４の局面によれば、単位光源が表示パネルに近い位置にあるほど光学素子の定める照射範囲が広くなると共に、表示パネルに近いほど複数の単位光源の配置間隔が広くなるので、各エリアへの独立した光照射を確実に行うことができる。 According to the fourth aspect of the present invention, as the unit light source is closer to the display panel, the irradiation range determined by the optical element is wider, and as the unit light source is closer to the display panel, the arrangement interval of the plurality of unit light sources is wider. Independent light irradiation to each area can be performed reliably.
　本発明の第５の局面によれば、各原色に対応した発光素子が各サブフレーム期間で任意の発光状態を取り得るので、各サブフレーム期間で、原色を混色して得られた所望の色の光源光が表示パネルのエリアに照射される。例えば、画像を表示すべきエリアにおいて、所望の色の画素の透過率を、当該所望の色の光源光が照射されるサブフレーム期間で比較的高く設定することにより、色割れを確実に抑制しつつ、複数パターンの混色表示を行うことができる。 According to the fifth aspect of the present invention, since the light emitting element corresponding to each primary color can take any light emission state in each subframe period, a desired color obtained by mixing the primary colors in each subframe period. Is emitted to the area of the display panel. For example, in an area where an image is to be displayed, by setting the transmittance of a pixel of a desired color to be relatively high in a subframe period in which the light source light of the desired color is irradiated, color breakup can be reliably suppressed. However, a mixed color display of a plurality of patterns can be performed.
　本発明の第６の局面によれば、複数のエリアに対応する光を反射部に反射させることにより、各エリアへの独立した光照射を確実に行うことができる。各サブフレーム期間で、所望の色の光源光が表示パネルのエリアに照射される。このため、本発明の第５の局面と同様の効果を奏することができる。 According to the sixth aspect of the present invention, the light corresponding to a plurality of areas is reflected by the reflecting portion, so that independent light irradiation to each area can be reliably performed. In each subframe period, the light source light of a desired color is irradiated to the area of the display panel. For this reason, there can exist an effect similar to the 5th aspect of this invention.
　本発明の第７の局面によれば、カラーホイールと、エリア毎にオン状態とオフ状態とを切り替え可能なデジタルマイクロミラーデバイスとが使用される。エリア毎に各原色の点灯時間比率を適切に設定することにより、各サブフレーム期間で、所望の色の光源光が表示パネルのエリアに確実に照射される。 According to the seventh aspect of the present invention, a color wheel and a digital micromirror device capable of switching between an on state and an off state for each area are used. By appropriately setting the lighting time ratio of each primary color for each area, the light source light of a desired color is reliably irradiated to the area of the display panel in each subframe period.
　本発明の第８の局面によれば、液晶パネルの過渡応答期間を考慮しつつ、各原色の点灯時間比率を適切に設定できるので、各サブフレーム期間で、所望の色の光源光を確実に実現することができる。 According to the eighth aspect of the present invention, since the lighting time ratio of each primary color can be appropriately set while considering the transient response period of the liquid crystal panel, the light source light of the desired color can be reliably transmitted in each subframe period. Can be realized.
　本発明の第９の局面によれば、液晶パネルの過渡応答期間においてカラーホイールが白色光を遮断するので、各サブフレーム期間で、所望の色の光源光をより確実に実現することができる。 According to the ninth aspect of the present invention, since the color wheel blocks white light during the transient response period of the liquid crystal panel, it is possible to more reliably realize light source light of a desired color in each subframe period.
　本発明の第１０の局面によれば、異なるエリアに異なる色の光源光が照射可能となるので、表示すべき画像に応じて色割れをより確実に行うことができる。 According to the tenth aspect of the present invention, it is possible to irradiate different areas with light sources of different colors, so that color breakup can be more reliably performed according to the image to be displayed.
　本発明の第１１の局面によれば、光制御部に光源光を直接照射して、本発明の第１の局面と同様の効果を奏することができる。 According to the eleventh aspect of the present invention, the light control unit can be directly irradiated with the light source light, and the same effect as in the first aspect of the present invention can be achieved.
　本発明の第１２の局面によれば、表示パネルを介して光制御部に光源光を照射して、本発明の第１の局面と同様の効果を奏することができる。 According to the twelfth aspect of the present invention, the same effect as that of the first aspect of the present invention can be achieved by irradiating the light control unit with the light source light via the display panel.
　本発明の第１３の局面によれば、画像表示装置の駆動方法において、本発明の第１の局面と同様の効果を奏することができる。 According to the thirteenth aspect of the present invention, in the driving method of the image display device, the same effect as in the first aspect of the present invention can be achieved.
本発明の第１の実施形態に係る画像表示装置の構成を示すブロック図である。1 is a block diagram illustrating a configuration of an image display device according to a first embodiment of the present invention. 図１に示す液晶パネルの構成を示す図である。It is a figure which shows the structure of the liquid crystal panel shown in FIG. 図１に示す光源部の構成を示す側面図である。It is a side view which shows the structure of the light source part shown in FIG. 図１に示す光源部の構成を示す上面図である。It is a top view which shows the structure of the light source part shown in FIG. 図３および図４に示す単位光源の構成を示す図である。It is a figure which shows the structure of the unit light source shown to FIG. 3 and FIG. 上記第１の実施形態における液晶パネルのエリアと画素形成部との対応関係を説明するための図である。It is a figure for demonstrating the correspondence of the area of the liquid crystal panel in the said 1st Embodiment, and a pixel formation part. 上記第１の実施形態における液晶パネル、透明散乱板、および光源部の配置を説明するための側面図である。It is a side view for demonstrating arrangement | positioning of the liquid crystal panel in the said 1st Embodiment, a transparent scattering plate, and a light source part. 上記第１の実施形態における液晶パネル、透明散乱板、および光源部の配置を説明するための上面図である。It is a top view for demonstrating arrangement | positioning of the liquid crystal panel in the said 1st Embodiment, a transparent scattering plate, and a light source part. 表示画像の一例を示す図である。It is a figure which shows an example of a display image. 図９に示す着目エリアの拡大図である。FIG. 10 is an enlarged view of the area of interest shown in FIG. 9. 図１０に示す各色の色成分比の一例を示す図である。It is a figure which shows an example of the color component ratio of each color shown in FIG. 上記第１の実施形態におけるフレーム期間の構成を示す図である。It is a figure which shows the structure of the frame period in the said 1st Embodiment. 着目エリアの各画素の色を示す図である。It is a figure which shows the color of each pixel of an attention area. 本発明の第２の実施形態における液晶パネル、透明散乱板、および光源部の配置を説明するための側面図である。It is a side view for demonstrating arrangement | positioning of the liquid crystal panel in the 2nd Embodiment of this invention, a transparent scattering plate, and a light source part. 上記第２の実施形態における液晶パネル、透明散乱板、および光源部の配置を説明するための上面図である。It is a top view for demonstrating arrangement | positioning of the liquid crystal panel in the said 2nd Embodiment, a transparent scattering plate, and a light source part. 本発明の第３の実施形態における単位光源の構成を示す図である。It is a figure which shows the structure of the unit light source in the 3rd Embodiment of this invention. 上記第３の実施形態における単位光源からエリアへの光照射を説明するための図である。It is a figure for demonstrating the light irradiation to the area from the unit light source in the said 3rd Embodiment. 本発明の第４の実施形態における液晶パネル、透明散乱板、および光源部の配置を説明するための側面図である。It is a side view for demonstrating arrangement | positioning of the liquid crystal panel in the 4th Embodiment of this invention, a transparent scattering plate, and a light source part. 図１８に示す光源部の上面透視図である。It is a top surface perspective view of the light source part shown in FIG. 上記第４の実施形態における１サブフレーム期間の動作を説明するための図である。It is a figure for demonstrating the operation | movement of 1 sub-frame period in the said 4th Embodiment. 色割れの発生原理を説明するための図である。It is a figure for demonstrating the generation | occurrence | production principle of a color break.
　以下、添付図面を参照しながら、本発明の第１～第４の実施形態について説明する。 Hereinafter, first to fourth embodiments of the present invention will be described with reference to the accompanying drawings.
　＜１．第１の実施形態＞
　＜１．１　全体構成＞
　図１は、本発明の第１の実施形態に係る画像表示装置１０の構成を示すブロック図である。画像表示装置１０は、表示制御回路１１、パネル駆動回路１２、光源駆動回路１３、液晶パネル１４、透明散乱板１５、および光源部１６を含んでいる。本実施形態では、液晶パネル１４は表示パネルに相当し、透明散乱板１５は光制御部に相当する。 <1. First Embodiment>
<1.1 Overall configuration>
FIG. 1 is a block diagram showing a configuration of an image display apparatus 10 according to the first embodiment of the present invention. The image display device 10 includes a display control circuit 11, a panel drive circuit 12, a light source drive circuit 13, a liquid crystal panel 14, a transparent scattering plate 15, and a light source unit 16. In the present embodiment, the liquid crystal panel 14 corresponds to a display panel, and the transparent scattering plate 15 corresponds to a light control unit.
　画像表示装置１０は、フィールドシーケンシャル方式で液晶パネル１４に画像を表示する。フィールドシーケンシャル方式では、光源光の色が順に切り替わると共に、その切り替わりと同期して液晶パネル１４に各色のデータが与えられて透過状態が制御される。ただし、本実施形態におけるフィールドシーケンシャル方式は、従来のフィールドシーケンシャル方式と異なり、画面全体が同一色であるサブフレームを用いた加法混色は行われない。本実施形態におけるフィールドシーケンシャル方式の説明は後述するが、従来のフィールドシーケンシャル方式と同様に１つの画素に複数の副画素を形成することなくカラー表示ができるので、高解像度化が可能になる。また、各画素にカラーフィルタを形成する必要がなくなり、ディスプレイ背面からの環境光の透過率が向上するので、透明ディスプレイを構成することができる。 The image display device 10 displays an image on the liquid crystal panel 14 by a field sequential method. In the field sequential method, the color of the light source light is sequentially switched, and data of each color is given to the liquid crystal panel 14 in synchronization with the switching to control the transmission state. However, the field sequential method in the present embodiment is different from the conventional field sequential method in that additive color mixing using subframes having the same color on the entire screen is not performed. Although the field sequential method in this embodiment will be described later, color display can be performed without forming a plurality of subpixels in one pixel as in the conventional field sequential method, so that high resolution can be achieved. Further, it is not necessary to form a color filter in each pixel, and the transmittance of ambient light from the back of the display is improved, so that a transparent display can be configured.
　表示制御回路１１は、外部から入力信号ＩＮを受け取り、当該入力信号ＩＮに基づいてパネル駆動回路１２および光源駆動回路１３を制御する。より詳細には、表示制御回路１１は、パネル駆動回路１２を制御するためのパネル制御信号ＰＳをパネル駆動回路１２に与え、光源駆動回路１３を制御するための光源制御信号ＬＳを光源駆動回路１３に与える。表示制御回路１１は、入力信号ＩＮが示すフレーム画像をサブフレーム画像に変換するためのサブフレーム画像生成部２１を含んでいる。言い換えると、表示制御回路１１は、サブフレーム画像生成部２１によって入力信号ＩＮの１フレーム期間を複数のサブフレーム期間に分割する。パネル制御信号ＰＳおよび光源制御信号ＬＳのそれぞれには、サブフレーム画像生成部２１で生成されたサブフレーム画像に関する信号および各種タイミング信号などが含まれている。パネル駆動回路１２は、受け取ったパネル制御信号ＰＳに基づいて液晶パネル１４を駆動する。光源駆動回路１３は、受け取った光源制御信号ＬＳに基づいて光源部１６を駆動する。 The display control circuit 11 receives an input signal IN from the outside, and controls the panel drive circuit 12 and the light source drive circuit 13 based on the input signal IN. More specifically, the display control circuit 11 gives a panel control signal PS for controlling the panel drive circuit 12 to the panel drive circuit 12, and supplies a light source control signal LS for controlling the light source drive circuit 13 to the light source drive circuit 13. To give. The display control circuit 11 includes a subframe image generation unit 21 for converting a frame image indicated by the input signal IN into a subframe image. In other words, the display control circuit 11 divides one frame period of the input signal IN into a plurality of subframe periods by the subframe image generation unit 21. Each of the panel control signal PS and the light source control signal LS includes a signal related to the subframe image generated by the subframe image generation unit 21, various timing signals, and the like. The panel drive circuit 12 drives the liquid crystal panel 14 based on the received panel control signal PS. The light source driving circuit 13 drives the light source unit 16 based on the received light source control signal LS.
　図２は、図１に示す液晶パネル１４の構成を示す図である。液晶パネル１４は、複数の信号線ＳＬと、複数の走査線ＧＬと、複数の信号線ＳＬおよび複数の走査線ＧＬの交差点に対応してマトリクス状に配置された複数の画素形成部１４１とを含んでいる。液晶パネル１４は、パネル駆動回路１２によって駆動されることにより各画素形成部１４１における入射光の透過率（以下「画素形成部１４１の透過率」という場合がある。）を制御する。なお、本実施形態における液晶パネル１４の表示方式は、ノーマリブラック方式およびノーマリホワイト方式のいずれであっても良い。 FIG. 2 is a diagram showing the configuration of the liquid crystal panel 14 shown in FIG. The liquid crystal panel 14 includes a plurality of signal lines SL, a plurality of scanning lines GL, and a plurality of pixel forming portions 141 arranged in a matrix corresponding to the intersections of the plurality of signal lines SL and the plurality of scanning lines GL. Contains. The liquid crystal panel 14 is driven by the panel drive circuit 12 to control the transmittance of incident light in each pixel forming portion 141 (hereinafter, also referred to as “the transmittance of the pixel forming portion 141”). Note that the display method of the liquid crystal panel 14 in the present embodiment may be either a normally black method or a normally white method.
　透明散乱板１５は、散乱子の密度を抑えることで透明度を高めた散乱板（拡散板ともいう。）である。透明散乱板１５は、光源部１６が出射した光源光を液晶パネル１４に照射し、また、液晶パネル１４が位置する側と反対側の主面から入射した光（背景光に相当する。）を透過することができるように構成されている。このように、透明散乱板１５は、散乱および透過の双方を行うことができる。なお、透明散乱板１５、液晶パネル１４、および光源部１６の位置関係は後述する。以下では、液晶パネル１４および透明散乱板１５を合わせて「スクリーン部」という場合がある。 The transparent scattering plate 15 is a scattering plate (also referred to as a diffusion plate) whose transparency is increased by suppressing the density of the scatterers. The transparent scattering plate 15 irradiates the liquid crystal panel 14 with the light source light emitted from the light source unit 16, and receives light (corresponding to background light) incident from the main surface opposite to the side where the liquid crystal panel 14 is located. It is comprised so that it can permeate | transmit. Thus, the transparent scattering plate 15 can perform both scattering and transmission. The positional relationship among the transparent scattering plate 15, the liquid crystal panel 14, and the light source unit 16 will be described later. Hereinafter, the liquid crystal panel 14 and the transparent scattering plate 15 may be collectively referred to as a “screen portion”.
　図３は、図１に示す光源部１６の側面図である。図４は、図１に示す光源部１６の上面図である。光源部１６は、図３および図４に示すように、複数の単位光源１７と、複数の単位光源１７をスクリーン部に向けて配置するための配置台１８とを含んでいる。本実施形態では、液晶パネル１４は複数のエリアに分割され、それらの複数のエリアにそれぞれ対応して複数の単位光源１７が配置されている。なお、液晶パネル１４の複数のエリアへの分割については後述する。 FIG. 3 is a side view of the light source unit 16 shown in FIG. FIG. 4 is a top view of the light source unit 16 shown in FIG. As shown in FIGS. 3 and 4, the light source unit 16 includes a plurality of unit light sources 17 and an arrangement table 18 for arranging the plurality of unit light sources 17 toward the screen unit. In the present embodiment, the liquid crystal panel 14 is divided into a plurality of areas, and a plurality of unit light sources 17 are arranged corresponding to the plurality of areas, respectively. The division of the liquid crystal panel 14 into a plurality of areas will be described later.
　図５は、図３および図４に示す単位光源１７の構成を示す図である。単位光源１７は、Ｒ（赤）、Ｇ（緑）およびＢ（青）の光をそれぞれ発する３個の発光素子からなる発光素子組１７１と、発光素子組１７１からの光の照射範囲を定めるレンズ（光学素子）１７３とを含んでいる。発光素子は、例えばＬＥＤであるが、ＣＣＦＬなどでも良い。以下では、Ｒの光を発する発光素子のことを「Ｒ発光素子」といい、符号１７２ｒで表す。また、Ｇの光を発する発光素子のことを「Ｇ発光素子」といい、符号１７２ｇで表す。また、Ｂの光を発する発光素子のことを「Ｂ発光素子」といい、符号１７２ｂで表す。なお、発光素子組１７１において、Ｒ，Ｇ，Ｂ発光素子１７２ｒ，１７２ｇ，１７２ｂに代えてまたはＲ，Ｇ，Ｂ発光素子１７２ｒ，１７２ｇ，１７２ｂの少なくとも一部と共に、他の原色の光を発する発光素子を使用するようにしても良い。 FIG. 5 is a diagram showing the configuration of the unit light source 17 shown in FIG. 3 and FIG. The unit light source 17 includes a light-emitting element set 171 composed of three light-emitting elements that respectively emit R (red), G (green), and B (blue) light, and a lens that determines an irradiation range of light from the light-emitting element set 171. (Optical element) 173. The light emitting element is, for example, an LED, but may be a CCFL or the like. Hereinafter, a light emitting element that emits R light is referred to as an “R light emitting element” and is denoted by reference numeral 172r. A light-emitting element that emits G light is referred to as a “G light-emitting element” and is denoted by reference numeral 172 g. A light-emitting element that emits B light is referred to as a “B light-emitting element” and is denoted by reference numeral 172b. In the light emitting element set 171, light emission that emits light of other primary colors instead of the R, G, B light emitting elements 172r, 172g, 172b or together with at least a part of the R, G, B light emitting elements 172r, 172g, 172b. An element may be used.
　図６は、本実施形態における液晶パネル１４のエリア３１と画素形成部１４１との対応関係を説明するための図である。本実施形態において、液晶パネル１４は、物理的にではなく論理的に複数のエリア３１に分割される。１つのエリア３１には、複数の画素形成部１４１が含まれ、１つの単位光源１７が対応している。このような液晶パネル１４の複数のエリア３１への分割は、表示制御回路１１によって入力信号ＩＮに基づいて行われる。表示制御回路１１は、具体的には、入力信号ＩＮが示すフレーム画像またはサブフレーム画像生成部２１によって得られるサブフレーム画像を分割することにより、液晶パネル１４の複数のエリア３１への分割を行う。ここで、エリア３１の数（以下「分割数」という。）は、例えば、表示制御回路１１の内部または外部に設けられたメモリに予め保持され、適宜読み出されて利用される。あるいは、分割数は、入力信号ＩＮが示すフレーム画像またはサブフレーム画像生成部２１によって得られるサブフレーム画像に基づいて表示制御回路１１によって求めるようにしても良い。表示制御回路１１によって生成される光源制御信号ＬＳには、例えば、各エリア３１における各画素の色データがさらに含まれる。そして、光源部１６は、各エリア３１における各画素の色データに基づいて、各エリア３１に独立して光照射を行う。 FIG. 6 is a diagram for explaining a correspondence relationship between the area 31 of the liquid crystal panel 14 and the pixel forming portion 141 in the present embodiment. In the present embodiment, the liquid crystal panel 14 is logically divided into a plurality of areas 31 instead of physically. One area 31 includes a plurality of pixel forming portions 141, and one unit light source 17 corresponds thereto. Such division of the liquid crystal panel 14 into a plurality of areas 31 is performed by the display control circuit 11 based on the input signal IN. Specifically, the display control circuit 11 divides the liquid crystal panel 14 into a plurality of areas 31 by dividing the frame image indicated by the input signal IN or the subframe image obtained by the subframe image generation unit 21. . Here, the number of areas 31 (hereinafter referred to as “the number of divisions”) is stored in advance in a memory provided inside or outside the display control circuit 11 and is read and used as appropriate. Alternatively, the division number may be obtained by the display control circuit 11 based on the frame image indicated by the input signal IN or the subframe image obtained by the subframe image generation unit 21. The light source control signal LS generated by the display control circuit 11 further includes color data of each pixel in each area 31, for example. Then, the light source unit 16 performs light irradiation independently on each area 31 based on the color data of each pixel in each area 31.
　＜１．２　スクリーン部および光源部の配置＞
　図７は、本実施形態におけるスクリーン部（液晶パネル１４および透明散乱板１５）および光源部１６の配置を説明するための側面図である。図８は、本実施形態におけるスクリーン部および光源部１６の配置を説明するための上面図である。図７および図８において、図の左側が正面（液晶パネル１４に表示された画像の観察者が存在する側の面をいう。）であるとする。図７および図８に示すように、透明散乱板１５は、液晶パネル１４の背面（正面と反対側の面をいう。）側に、液晶パネル１４に対向して配置されている。液晶パネル１４と透明散乱板１５との間には空気層などが設けられていても良い。光源部１６は、スクリーン部の背面側の斜め下方に配置されている。なお、スクリーン部および光源部１６の設置方法は特に限定されるものではない。例えば、スクリーン部の下方に、当該スクリーン部を支えるための支持部などが設けられていても良い。 <1.2 Arrangement of screen and light source>
FIG. 7 is a side view for explaining the arrangement of the screen unit (the liquid crystal panel 14 and the transparent scattering plate 15) and the light source unit 16 in the present embodiment. FIG. 8 is a top view for explaining the arrangement of the screen unit and the light source unit 16 in the present embodiment. 7 and 8, the left side of the figure is the front (refers to the surface on which the viewer of the image displayed on the liquid crystal panel 14 is present). As shown in FIGS. 7 and 8, the transparent scattering plate 15 is disposed on the back surface (referred to as a surface opposite to the front surface) of the liquid crystal panel 14 so as to face the liquid crystal panel 14. An air layer or the like may be provided between the liquid crystal panel 14 and the transparent scattering plate 15. The light source unit 16 is disposed obliquely below the back side of the screen unit. In addition, the installation method of a screen part and the light source part 16 is not specifically limited. For example, a support part for supporting the screen part may be provided below the screen part.
　図７および図８に示すように、複数の単位光源１７の配置間隔は、スクリーン部に近いほど広くなっている。また、レンズ１７３が定める発光素子組１７１の光の照射範囲は、それらを含む単位光源１７の位置がスクリーン部に近いほど広くなっている。このような構成により、光源部１６は、液晶パネル１４の各エリア３１に独立して透明散乱板１５から光が照射されるように、透明散乱板１５に光源光を照射することが可能になっている。以下では、光源部１６が、液晶パネル１４のエリア３１に透明散乱板１５から光が照射されるように透明散乱板１５に光源光を照射することを、「液晶パネル１４のエリア３１に光源光を照射する」という場合がある。また、図７に示すように、配置台１８において複数の単位光源１７が配置される面（以下「配置面」という。）とスクリーン部の主面とは鋭角を成している。 As shown in FIGS. 7 and 8, the arrangement interval of the plurality of unit light sources 17 is wider as it is closer to the screen portion. In addition, the light irradiation range of the light emitting element set 171 defined by the lens 173 is wider as the position of the unit light source 17 including them is closer to the screen portion. With such a configuration, the light source unit 16 can irradiate the transparent scattering plate 15 with light source light so that light is irradiated from the transparent scattering plate 15 independently to each area 31 of the liquid crystal panel 14. ing. Hereinafter, the light source unit 16 irradiates the transparent scattering plate 15 with light source light so that the area 31 of the liquid crystal panel 14 is irradiated with light from the transparent scattering plate 15. May be irradiated. Further, as shown in FIG. 7, the surface on which the plurality of unit light sources 17 are disposed (hereinafter referred to as “arrangement surface”) and the main surface of the screen portion form an acute angle.
　透明散乱板１５には、その背面（液晶パネル１４が位置する側と反対側の主面）から光源光が照射される。透明散乱板１５に照射された光源光は、透明散乱板１５により散乱される。散乱された光源光のうちの液晶パネル１４へ向かう成分が液晶パネル１４に照射される。なお、透明散乱板１５に照射された光源光の一部が透明散乱板１５を透過するが、光源光は、スクリーン部背面側の斜め下方からスクリーン部正面側の斜め上方に向かって照射されるので、透明散乱板１５を透過する光源光は表示に影響を与えない（図７を参照）。このような方向への光源光の照射を実現するために、配置台１８の配置面とスクリーン部との成す角は、透明散乱板１５に光源光を照射できる範囲内で９０°に近いことが望ましい。 The transparent scattering plate 15 is irradiated with light source light from the back surface (the main surface opposite to the side where the liquid crystal panel 14 is located). The light source light applied to the transparent scattering plate 15 is scattered by the transparent scattering plate 15. A component of the scattered light source light toward the liquid crystal panel 14 is irradiated to the liquid crystal panel 14. A part of the light source light applied to the transparent scattering plate 15 passes through the transparent scattering plate 15, but the light source light is applied from an oblique lower side on the back side of the screen portion to an oblique upper side on the front side of the screen portion. Therefore, the light source light transmitted through the transparent scattering plate 15 does not affect the display (see FIG. 7). In order to realize the irradiation of the light source light in such a direction, the angle formed by the arrangement surface of the arrangement table 18 and the screen portion is close to 90 ° within the range in which the transparent scattering plate 15 can be irradiated with the light source light. desirable.
　また、透明散乱板１５には、その背面から背景光が入射する。透明散乱板１５に入射した背景光は透過することにより液晶パネル１４に照射される。なお、透明散乱板１５に入射した背景光の一部が透明散乱板１５により散乱されるが、上述のように透明散乱板１５の散乱子の密度は抑えられている。このため、透明散乱板１５による背景光の散乱が背景の視認に与える影響は小さい。 Further, background light is incident on the transparent scattering plate 15 from the back side. The background light incident on the transparent scattering plate 15 is irradiated to the liquid crystal panel 14 by being transmitted. A part of the background light incident on the transparent scattering plate 15 is scattered by the transparent scattering plate 15, but the density of scatterers of the transparent scattering plate 15 is suppressed as described above. For this reason, the influence of the scattering of the background light by the transparent scattering plate 15 on the visual recognition of the background is small.
　ところで、液晶パネル１４において画像を表示すべき部分（以下「画像表示部」という。）および画像を表示しない部分（以下「画像非表示部」という。）は、表示制御回路１１によって入力信号ＩＮに基づいて設定される。画像表示部では、透過率が適切に制御されることにより、光源光に基づいて画像が表示される。このとき、画像表示部には背景光も入射されるが、光源光の輝度を比較的高く設定することにより、背景光の画像表示部への入射が画像表示に与える影響を抑制することができる。なお、光源光の輝度を意図的に低く設定して、画像に背景を透かした表示を行うことも可能である。画像非表示部では、透過率が比較的高く設定されることにより、透明散乱板１５を透過した背景光がさらに透過する。このようにして、背景が透過される。なお、画像非表示部は、エリア３１毎に設定しても良く、画素毎に設定しても良い。ところで、スクリーン部の背面に背景光を遮るものをなくすべく、水平方向において、光源部１６はスクリーン部に重複しないように配置されることが望ましい。このような配置によれば、背景透過をより確実に行うことができる。 By the way, a portion where an image is to be displayed (hereinafter referred to as “image display portion”) and a portion where an image is not displayed (hereinafter referred to as “image non-display portion”) on the liquid crystal panel 14 are input to the input signal IN by the display control circuit 11. Set based on. The image display unit displays an image based on the light source light by appropriately controlling the transmittance. At this time, the background light is also incident on the image display unit. However, by setting the luminance of the light source light to be relatively high, the influence of the background light incident on the image display unit on the image display can be suppressed. . Note that it is possible to intentionally set the luminance of the light source light to be low and display the image with a background watermark. In the image non-display portion, the background light transmitted through the transparent scattering plate 15 is further transmitted by setting the transmittance to be relatively high. In this way, the background is transmitted. The image non-display portion may be set for each area 31 or for each pixel. By the way, it is desirable that the light source unit 16 is arranged so as not to overlap the screen unit in the horizontal direction so that the back of the screen unit does not block the background light. According to such an arrangement, background transmission can be performed more reliably.
　＜１．３　動作＞
　図９は、本実施形態における表示画像の一例を示す図である。図９における各矩形ブロックはエリア３１に対応する。以下では、太線で囲われたエリア（以下「着目エリア」といい、符号３２で表す。）に着目する。図１０は、図９に示す着目エリア３２の拡大図である。表示画像のうち、着目エリア３２部分の画像（以下「着目エリア画像」という。）は、第１～第４色α，β，γ，δを含んでいるとする。第１～第４色α，β，γ，δのそれぞれは、Ｒ，Ｇ，Ｂの所望の色成分比によって実現される。なお、含まれる色数および色の種類は、エリア３１毎に異なっている。ただし、含まれる色数および色の種類が同一のエリア３１が２以上存在していても良い。 <1.3 Operation>
FIG. 9 is a diagram illustrating an example of a display image in the present embodiment. Each rectangular block in FIG. 9 corresponds to the area 31. In the following, attention is focused on an area surrounded by a thick line (hereinafter referred to as “focused area” and indicated by reference numeral 32). FIG. 10 is an enlarged view of the area of interest 32 shown in FIG. Of the displayed images, the image of the target area 32 portion (hereinafter referred to as “target area image”) includes first to fourth colors α, β, γ, and δ. Each of the first to fourth colors α, β, γ, and δ is realized by a desired color component ratio of R, G, and B. Note that the number of colors and the types of colors included differ for each area 31. However, there may be two or more areas 31 having the same number of colors and the same kind of color.
　図１１は、第１～第４色α，β，γ，δのそれぞれの色成分比の一例を示す図である。なお、色成分比は、Ｒ成分、Ｇ成分、およびＢ成分の大きさの相対的な関係を示すものであって、各色成分の大きさ（成分値）を示すものではない。したがって、図１１に示す例において、必ずしも第２色βのＲ成分よりも第１色αのＲ成分の方が大きいわけではない。 FIG. 11 is a diagram showing an example of the color component ratio of each of the first to fourth colors α, β, γ, and δ. The color component ratio indicates a relative relationship between the sizes of the R component, the G component, and the B component, and does not indicate the size (component value) of each color component. Therefore, in the example shown in FIG. 11, the R component of the first color α is not necessarily larger than the R component of the second color β.
　図１２は、本実施形態におけるフレーム期間の構成を示す図である。本実施形態では、１フレーム期間は４つのサブフレーム期間（第１～第４サブフレーム期間）で構成される。各サブフレーム期間において、単位光源１７に含まれる各色の発光素子は任意の状態を取り得る。このため、Ｒ，Ｇ，Ｂのうちのいずれか１色の発光素子のみが点灯状態になることもあれば、複数色の発光素子が点灯状態になることもある。また、Ｒ，Ｇ，Ｂ発光素子１７２ｒ，１７２ｇ，１７２ｂで互いに発光強度が異なることもある。したがって、光源部１６は、各サブフレーム期間において、所望の色成分比で実現される色の光源光を液晶パネル１４の各エリア３１に独立して照射することができる。 FIG. 12 is a diagram showing the configuration of the frame period in the present embodiment. In the present embodiment, one frame period is composed of four subframe periods (first to fourth subframe periods). In each subframe period, the light emitting elements of the respective colors included in the unit light source 17 can take an arbitrary state. For this reason, only the light emitting element of any one of R, G, and B may be lit, or the light emitting elements of a plurality of colors may be lit. Also, the R, G, and B light emitting elements 172r, 172g, and 172b may have different light emission intensities. Therefore, the light source unit 16 can independently irradiate each area 31 of the liquid crystal panel 14 with light source light of a color realized with a desired color component ratio in each subframe period.
　図１３は、着目エリア３２内の各画素の色を示す図である。ここでは、着目エリア３２に２５個（Ｘ軸方向に５個、Ｙ軸方向に５個）の画素が含まれているものとする。上述のように、着目エリア画像には第１～第４色α，β，γ，δが必要とされる。例えば、（Ｘ，Ｙ）＝（１，１）の画素の色は第１色αであり、（Ｘ，Ｙ）＝（３，２）の画素の色は第２色βであり、（Ｘ，Ｙ）＝（２，５）の画素の色は第３色γであり、（Ｘ，Ｙ）＝（５，５）の画素の色は第４色δである。なお、図示の便宜上、図１３における各色の画素と図１０における各色の画素との位置が一致しない点に留意されたい。 FIG. 13 is a diagram showing the color of each pixel in the area of interest 32. Here, it is assumed that the area of interest 32 includes 25 pixels (5 in the X-axis direction and 5 in the Y-axis direction). As described above, the first to fourth colors α, β, γ, and δ are required for the attention area image. For example, the color of the pixel of (X, Y) = (1, 1) is the first color α, the color of the pixel of (X, Y) = (3, 2) is the second color β, and (X , Y) = (2,5) is the third color γ, and (X, Y) = (5,5) is the fourth color δ. Note that, for convenience of illustration, the positions of the pixels of each color in FIG. 13 and the pixels of each color in FIG. 10 do not match.
　着目エリア３２には、第１～第４サブフレーム期間にそれぞれ第１～第４色α，β，γ，δの光源光が照射されるとする。このような条件の下、第１サブフレーム期間では、第１色αの画素を形成すべき画素形成部１４１は透過状態（透過率が比較的高い状態をいう。）に設定され、他の色の画素を形成すべき画素形成部１４１は遮蔽状態（透過率がゼロの状態またはゼロに近い状態をいう。）に設定される。また、第２サブフレーム期間では、第２色βの画素を形成すべき画素形成部１４１は透過状態に設定され、他の色の画素を形成すべき画素形成部１４１は遮蔽状態に設定される。また、第３サブフレーム期間では、第３色γの画素を形成すべき画素形成部１４１は透過状態に設定され、他の色の画素を形成すべき画素形成部１４１は遮蔽状態に設定される。また、第４サブフレーム期間では、第４色δの画素を形成すべき画素形成部１４１は透過状態に設定され、他の色の画素を形成すべき画素形成部１４１は遮蔽状態に設定される。このようにして、１フレーム期間において、第１～第４色α，β，γ，δからなるフレーム画像が実現される。 Suppose that the target area 32 is irradiated with light source light of the first to fourth colors α, β, γ, and δ in the first to fourth subframe periods, respectively. Under such conditions, in the first subframe period, the pixel formation portion 141 where the pixel of the first color α is to be formed is set to a transmissive state (which means a state with relatively high transmittance), and other colors The pixel forming portion 141 that should form the pixel is set in a shielding state (a state in which the transmittance is zero or a state close to zero). In the second subframe period, the pixel formation unit 141 that should form pixels of the second color β is set in a transmissive state, and the pixel formation unit 141 that should form pixels of other colors is set in a shielding state. . In the third subframe period, the pixel formation unit 141 that should form pixels of the third color γ is set in a transmissive state, and the pixel formation unit 141 that should form pixels of other colors is set in a shielding state. . In the fourth subframe period, the pixel formation unit 141 that should form the pixels of the fourth color δ is set to the transmissive state, and the pixel formation unit 141 that should form the pixels of the other colors is set to the shielding state. . In this manner, a frame image composed of the first to fourth colors α, β, γ, δ is realized in one frame period.
　なお、第１～第４サブフレーム期間における光源光の色の種類および色の順番はエリア３１毎に異なる。また、各エリア３１において、サブフレーム期間数よりも必要な色数が少ない場合には、必要な色の表示を行うためのサブフレーム期間以外では、例えばＲ，Ｇ，Ｂの色成分が等しくなるように各色の発光素子を点灯させても良い。 It should be noted that the type of color of the light source light and the order of the colors in the first to fourth subframe periods differ from one area 31 to another. Further, in each area 31, when the required number of colors is smaller than the number of subframe periods, the color components of R, G, B, for example, are equal except in the subframe period for displaying the necessary colors. As described above, the light emitting elements of the respective colors may be turned on.
　＜１．４　効果＞
　本実施形態によれば、カラーフィルタ不要のフィールドシーケンシャル方式の画像表示装置１０において、サブフレーム期間毎に複数色のいずれかに対応した色の光源光が液晶パネル１４の各エリア３１に独立して照射される。また、Ｒ，Ｇ，Ｂ発光素子１７２ｒ，１７２ｇ，１７２ｂが各サブフレーム期間で任意の発光状態を取り得るので、各サブフレーム期間で混色表示を行うことにより所望の色の光源光が照射される。このため、各エリア３１において、所望の色の画素を形成すべき画素形成部１４１を、当該所望の色の光源光が当該エリア３１に照射されるサブフレーム期間で透過状態に設定することにより、色割れを確実に抑制しつつ、複数パターンの混色表示（第１～第４色α，β，γ，δ）を行うことができる。また、透明散乱板１５がカラーフィルタ不要の液晶パネル１４に対向して設けられるので、液晶パネル１４において入射光の透過率を適切に制御することにより、画像表示および背景透過を行うことができる。また、光源光を周囲に漏らさないためのケースが不要であるので、画像表示装置１０のサイズの増大を抑制することができる。 <1.4 Effect>
According to the present embodiment, in the field sequential type image display device 10 that does not require a color filter, light source light of a color corresponding to one of a plurality of colors is independently provided to each area 31 of the liquid crystal panel 14 for each subframe period. Irradiated. In addition, since the R, G, and B light emitting elements 172r, 172g, and 172b can take any light emission state in each subframe period, light source light of a desired color is emitted by performing mixed color display in each subframe period. . For this reason, in each area 31, by setting the pixel forming portion 141 that should form a pixel of a desired color to a transmission state in a subframe period in which the light source light of the desired color is irradiated to the area 31, Multiple color display (first to fourth colors α, β, γ, δ) can be performed while reliably preventing color breakup. Further, since the transparent scattering plate 15 is provided facing the liquid crystal panel 14 that does not require a color filter, image display and background transmission can be performed by appropriately controlling the transmittance of incident light in the liquid crystal panel 14. Moreover, since the case for not leaking light source light around is unnecessary, the increase in the size of the image display apparatus 10 can be suppressed.
　また、本実施形態によれば、Ｒ，Ｇ，Ｂ発光素子１７２ｒ，１７２ｇ，１７２ｂからなる発光素子組１７１および発光素子組１７１からの光の照射範囲を定めるレンズ１７３を含む単位光源１７が１つのエリアに対応する。このため、各単位光源１７において同様の発光素子組１７１を使用することができる。これにより、例えば発光素子組１７１の消費電力の均一化などを図ることができる。また、このような構成において、単位光源１７がスクリーン部に近い位置にあるほどレンズ１７３が定める発光素子組１７１の光の照射範囲が広くなると共に、スクリーン部に近いほど複数の単位光源１７の配置間隔が広くなるので、各エリア３１への独立した光照射をより確実に行うことができる。 In addition, according to the present embodiment, there is one unit light source 17 including a light emitting element set 171 including R, G, B light emitting elements 172r, 172g, and 172b and a lens 173 that defines an irradiation range of light from the light emitting element set 171. Corresponds to the area. For this reason, the same light emitting element group 171 can be used in each unit light source 17. Thereby, for example, the power consumption of the light emitting element group 171 can be made uniform. In such a configuration, as the unit light source 17 is closer to the screen portion, the light irradiation range of the light emitting element group 171 determined by the lens 173 becomes wider, and as the unit light source is closer to the screen portion, the arrangement of the plurality of unit light sources 17 is arranged. Since the interval is wide, independent light irradiation to each area 31 can be performed more reliably.
　＜２．第２の実施形態＞
　＜２．１　スクリーン部および光源部の配置＞
　図１４は、本実施形態におけるスクリーン部（液晶パネル１４および透明散乱板１５）および光源部１６の配置を説明するための側面図である。図１５は、本実施形態におけるスクリーン部および光源部１６の配置を説明するための上面図である。図１４および図１５では、上述の図７および図８と同様に図の左側が正面であるとする。本実施形態の構成要素のうち上記第１の実施形態と同一の要素については、同一の参照符号を付して適宜説明を省略する。上記第１の実施形態と同様に、本実施形態では、透明散乱板１５が液晶パネル１４の背面側に、液晶パネル１４に対向して配置されている。光源部１６は、スクリーン部の正面側の斜め下方に配置されている。 <2. Second Embodiment>
<2.1 Arrangement of screen and light source>
FIG. 14 is a side view for explaining the arrangement of the screen unit (the liquid crystal panel 14 and the transparent scattering plate 15) and the light source unit 16 in the present embodiment. FIG. 15 is a top view for explaining the arrangement of the screen unit and the light source unit 16 in the present embodiment. In FIGS. 14 and 15, it is assumed that the left side of the figure is the front as in FIGS. 7 and 8 described above. Among the constituent elements of the present embodiment, the same elements as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate. Similar to the first embodiment, in the present embodiment, the transparent scattering plate 15 is disposed on the back side of the liquid crystal panel 14 so as to face the liquid crystal panel 14. The light source unit 16 is disposed obliquely below the front side of the screen unit.
　透明散乱板１５には、その正面から液晶パネル１４を介して光源光が照射される。このため、透明散乱板１５に照射された光源光が透明散乱板１５により散乱され、散乱された光源光のうちの液晶パネル１４へ向かう成分が液晶パネル１４に照射される。なお、上記第１の実施形態と異なり、本実施形態では、光源部１６がスクリーン部の正面側の斜め下方に配置されているので、透明散乱板１５を透過した光源光が与える表示への影響を確実に抑制することができる。なお、背景の透過については、上記第１の実施形態と同様であるので、説明を省略する。 The transparent scattering plate 15 is irradiated with light source light from the front through the liquid crystal panel 14. For this reason, the light source light irradiated to the transparent scattering plate 15 is scattered by the transparent scattering plate 15, and the component of the scattered light source light toward the liquid crystal panel 14 is irradiated to the liquid crystal panel 14. Unlike the first embodiment, in this embodiment, since the light source unit 16 is disposed obliquely below the front side of the screen unit, the influence of the light source light transmitted through the transparent scattering plate 15 on the display is affected. Can be reliably suppressed. The background transmission is the same as that in the first embodiment, and a description thereof will be omitted.
　＜２．２　効果＞
　本実施形態によれば、液晶パネル１４を介して透明散乱板１５に光源光を照射して、上記第１の実施形態と同様の効果を奏することができる。 <2.2 Effect>
According to this embodiment, the transparent scattering plate 15 can be irradiated with the light source light via the liquid crystal panel 14, and the same effect as the first embodiment can be obtained.
　なお、本実施形態では、光制御部として透明散乱板１５を使用するとして説明したが、透明散乱板１５に代えて例えばハーフミラーを使用しても良い。これにより、ハーフミラーに照射された光源光の半分（光量が半分であることを意味する。）が液晶パネル１４に照射され、ハーフミラーに入射した背景光の半分（光量が半分であることを意味する。）が透過して液晶パネル１４に照射される。したがって、透明散乱板１５を使用した場合と同様の効果が得られる。また、ハーフミラーに限らず、透過率と反射率とが異なる他のミラーガラスを使用しても良い。 In the present embodiment, the transparent scattering plate 15 is used as the light control unit. However, for example, a half mirror may be used instead of the transparent scattering plate 15. Thereby, half of the light source light irradiated to the half mirror (meaning that the light amount is half) is irradiated to the liquid crystal panel 14 and half of the background light incident on the half mirror (the light amount is half). Means that the liquid crystal panel 14 is irradiated. Therefore, the same effect as when the transparent scattering plate 15 is used can be obtained. Moreover, you may use not only a half mirror but the other mirror glass from which the transmittance | permeability and reflectance differ.
　＜３．第３の実施形態＞
　＜３．１　単位光源の構成＞
　図１６は、本発明の第３の実施形態における単位光源１７の構成を示す図である。本実施形態の構成要素のうち上記第１の実施形態と同一の要素については、同一の参照符号を付して適宜説明を省略する。本実施形態では、上記第１の実施形態と異なり、Ｒ，Ｇ，Ｂにそれぞれ対応した３個の単位光源１７が１つのエリア３１に対応している。以下では、Ｒに対応した単位光源１７のことを「Ｒ単位光源」といい、符号１７ｒで表す。また、Ｇに対応した単位光源１７のことを「Ｇ単位光源」といい、符号１７ｇで表す。また、Ｂに対応した単位光源１７のことを「Ｂ単位光源」といい、符号１７ｂで表す。なお、Ｒ，Ｇ，Ｂ単位光源１７ｒ，１７ｇ，１７ｂに代えてまたはＲ，Ｇ，Ｂ単位光源１７ｒ，１７ｇ，１７ｂの少なくとも一部と共に、他の原色に対応した単位光源１７を使用しても良い。図１６では、Ｒ，Ｇ，Ｂ単位光源１７ｒ，１７ｇ，１７ｂのうちのＲ単位光源１７ｒを図示している。Ｒ単位光源１７ｒは、Ｒ発光素子１７２ｒとＲ発光素子１７２ｒからの光の照射範囲を定めるレンズ１７３とを含んでいる。なお、Ｇ，Ｂ単位光源１７ｇ，１７ｂは、原色が異なることを除きＲ単位光源１７ｒと同様の構成であるので、説明を省略する。 <3. Third Embodiment>
<Configuration of unit light source>
FIG. 16 is a diagram showing a configuration of the unit light source 17 in the third embodiment of the present invention. Among the constituent elements of the present embodiment, the same elements as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate. In the present embodiment, unlike the first embodiment, three unit light sources 17 respectively corresponding to R, G, and B correspond to one area 31. Hereinafter, the unit light source 17 corresponding to R is referred to as “R unit light source” and is represented by reference numeral 17r. The unit light source 17 corresponding to G is referred to as a “G unit light source” and is represented by reference numeral 17g. The unit light source 17 corresponding to B is referred to as a “B unit light source” and is represented by reference numeral 17b. The unit light sources 17 corresponding to other primary colors may be used in place of the R, G, B unit light sources 17r, 17g, 17b or together with at least a part of the R, G, B unit light sources 17r, 17g, 17b. good. FIG. 16 illustrates the R unit light source 17r among the R, G, B unit light sources 17r, 17g, and 17b. The R unit light source 17r includes an R light emitting element 172r and a lens 173 that defines an irradiation range of light from the R light emitting element 172r. The G and B unit light sources 17g and 17b have the same configuration as that of the R unit light source 17r except that the primary colors are different, and thus the description thereof is omitted.
　図１７は、本実施形態におけるＲ，Ｇ，Ｂ単位光源１７ｒ，１７ｇ，１７ｂからエリア３１への光照射を説明するための図である。Ｒ，Ｇ，Ｂ単位光源１７ｒ，１７ｇ，１７ｂのそれぞれは、対応するエリア３１に光を照射する。各サブフレーム期間における各色の発光素子の状態は、上記第１の実施形態と同様であるので、説明を省略する。 FIG. 17 is a diagram for explaining light irradiation from the R, G, B unit light sources 17r, 17g, and 17b to the area 31 in the present embodiment. Each of the R, G, B unit light sources 17r, 17g, 17b irradiates the corresponding area 31 with light. Since the state of each color light emitting element in each subframe period is the same as that in the first embodiment, the description thereof is omitted.
　本実施形態における単位光源１７の配置は、上記第１，第２の実施形態と基本的に同様である。各エリア３１に対応するＲ，Ｇ，Ｂ単位光源１７ｒ，１７ｇ，１７ｂは、スクリーン部の厚み方向と直交する方向（図８または図１５における縦方向）に並べて配置されていても良く、スクリーン部の厚み方向（図８または図１５における横方向）に並べて配置されていても良い。なお、本実施形態におけるスクリーン部および光源部１６の配置は、上記第１，第２の実施形態のいずれのものを採用しても良い。 The arrangement of the unit light sources 17 in this embodiment is basically the same as that in the first and second embodiments. The R, G, B unit light sources 17r, 17g, and 17b corresponding to each area 31 may be arranged side by side in a direction (vertical direction in FIG. 8 or FIG. 15) orthogonal to the thickness direction of the screen portion. May be arranged side by side in the thickness direction (lateral direction in FIG. 8 or FIG. 15). In addition, as for arrangement | positioning of the screen part and the light source part 16 in this embodiment, you may employ | adopt any of the said 1st, 2nd embodiment.
　＜３．２　効果＞
　本実施形態によれば、１つのエリア３１に、Ｒ，Ｇ，Ｂ単位光源１７ｒ，１７ｇ，１７ｂが対応する。Ｒ，Ｇ，Ｂ単位光源１７ｒ，１７ｇ，１７ｂのそれぞれは、当該原色に対応した発光素子およびレンズ１７３を含む。１つの発光素子と１つのレンズ１７３とが対応しているので、例えば発光素子サイズが大きい場合、上記第１，第２の実施形態に比べて、レンズ１７３の焦点ずれを抑制することができる。 <3.2 Effects>
According to the present embodiment, one area 31 corresponds to the R, G, B unit light sources 17r, 17g, and 17b. Each of the R, G, B unit light sources 17r, 17g, 17b includes a light emitting element and a lens 173 corresponding to the primary color. Since one light emitting element and one lens 173 correspond to each other, for example, when the size of the light emitting element is large, it is possible to suppress the defocus of the lens 173 compared to the first and second embodiments.
　＜４．第４の実施形態＞
　＜４．１　スクリーン部および光源部の配置＞
　図１８は、本発明の第４の実施形態におけるスクリーン部（液晶パネル１４および透明散乱板１５）および光源部１６の配置を説明するための側面図である。図１９は、図１８に示す光源部１６の上面透視図である。図１８および図１９では、上述の図７および図８と同様に図の左側が正面であるとする。本実施形態の構成要素のうち上記第１の実施形態と同一の要素については、同一の参照符号を付して適宜説明を省略する。上記第１の実施形態と同様に、本実施形態では、透明散乱板１５が液晶パネル１４の背面側に、液晶パネル１４に対向して配置されている。光源部１６は、スクリーン部の下方に配置されている。光源部１６とスクリーン部との間には、スクリーン部を支えるための支持部１９が設けられている。ただし、支持部１９は必須ではなく、他の手法によって本実施形態における光源部１６とスクリーン部との位置関係を実現しても良い。 <4. Fourth Embodiment>
<4.1 Arrangement of screen part and light source part>
FIG. 18 is a side view for explaining the arrangement of the screen unit (the liquid crystal panel 14 and the transparent scattering plate 15) and the light source unit 16 in the fourth embodiment of the present invention. FIG. 19 is a top perspective view of the light source unit 16 shown in FIG. In FIGS. 18 and 19, it is assumed that the left side of the figure is the front surface as in FIGS. 7 and 8 described above. Among the constituent elements of the present embodiment, the same elements as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate. Similar to the first embodiment, in the present embodiment, the transparent scattering plate 15 is disposed on the back side of the liquid crystal panel 14 so as to face the liquid crystal panel 14. The light source unit 16 is disposed below the screen unit. A support portion 19 for supporting the screen portion is provided between the light source portion 16 and the screen portion. However, the support portion 19 is not essential, and the positional relationship between the light source portion 16 and the screen portion in the present embodiment may be realized by other methods.
　図１９に示すように、光源部１６は、ランプ４１、カラーホイール４２、集光レンズ４３、デジタルマイクロミラーデバイス（Digital Micromirror Device：ＤＭＤ）４４、投影レンズ４５、および立ち上げミラー４６を含んでいる。本実施形態では、ランプ４１、カラーホイール４２、集光レンズ４３、ＤＭＤ４４、および投影レンズ４５により光照射部が実現され、立ち上げミラー４６により反射部が実現されている。 As shown in FIG. 19, the light source unit 16 includes a lamp 41, a color wheel 42, a condenser lens 43, a digital micromirror device (DMD) 44, a projection lens 45, and a rising mirror 46. . In the present embodiment, the lamp 41, the color wheel 42, the condenser lens 43, the DMD 44, and the projection lens 45 realize a light irradiation unit, and the rising mirror 46 realizes a reflection unit.
　ランプ４１は、白色光を発するランプであり、例えばハロゲンランプである。ランプ４１から発せられた白色光は、カラーホイール４２によってフルカラー化され、集光レンズ４３によって集光された後、ＤＭＤ４４に照射される。なお、カラーホイール４２は、Ｒ，Ｇ，Ｂの光を高速で切り替えて集光レンズ４３を介してＤＭＤ４４に照射するために、所望の周波数に基づいて回転する。なお、Ｒ，Ｇ，Ｂの光をＤＭＤ４４に照射するために、ハロゲンランプおよびカラーホイール４２に代えて、時分割で発光状態を切り替え可能なＲ発光素子、Ｇ発光素子、およびＢ発光素子を使用しても良い。 The lamp 41 is a lamp that emits white light, for example, a halogen lamp. White light emitted from the lamp 41 is made full color by the color wheel 42, collected by the condenser lens 43, and then irradiated to the DMD 44. The color wheel 42 rotates based on a desired frequency in order to switch R, G, and B light at high speed and irradiate the DMD 44 via the condenser lens 43. In order to irradiate DMD 44 with R, G, and B light, R light emitting element, G light emitting element, and B light emitting element that can switch the light emitting state in a time division manner are used instead of the halogen lamp and color wheel 42. You may do it.
　ＤＭＤ４４に照射された光は、ＤＭＤ４４がオン状態であるときにはＤＭＤ４４によって反射されることにより投影レンズ４５に照射される。ＤＭＤ４４がオフ状態であるときには、ＤＭＤ４４に照射された光は内部に吸収されて投影レンズ４５に照射されない。ＤＭＤ４４は、このようなオン状態とオフ状態との切り替えをエリア３１毎に可能となっている。本実施形態では、ＤＭＤ４４のオン状態／オフ状態の期間をエリア３１毎に調整することによって、上記第１の実施形態のようなＲ，Ｇ，Ｂの所望の色成分比を、エリア３１毎に、各サブフレーム期間において時分割的に実現することができる。このようにして、エリア３１毎に各原色の点灯時間比率を適切に設定することにより、各サブフレーム期間で所望の色の光源光を実現することができる。なお、本実施形態における１サブフレーム期間の動作のさらなる説明については後述する。 The light irradiated on the DMD 44 is irradiated on the projection lens 45 by being reflected by the DMD 44 when the DMD 44 is in the ON state. When the DMD 44 is in the OFF state, the light irradiated on the DMD 44 is absorbed inside and is not irradiated on the projection lens 45. The DMD 44 can switch between the on state and the off state for each area 31. In the present embodiment, the desired color component ratio of R, G, B as in the first embodiment is adjusted for each area 31 by adjusting the ON / OFF state period of the DMD 44 for each area 31. In each subframe period, it can be realized in a time division manner. In this way, by appropriately setting the lighting time ratio of each primary color for each area 31, it is possible to realize light source light of a desired color in each subframe period. A further description of the operation in one subframe period in the present embodiment will be described later.
　投影レンズ４５は、複数のＤＭＤ４４から照射された光を立ち上げミラー４６に照射する。立ち上げミラー４６は、図１８に示すようにスクリーン部に向けて配置されているので、投影レンズ４５から照射された光は、光源光として透明散乱板１５に照射される。 The projection lens 45 irradiates the mirror 46 with the light emitted from the plurality of DMDs 44. Since the raising mirror 46 is arranged toward the screen portion as shown in FIG. 18, the light emitted from the projection lens 45 is applied to the transparent scattering plate 15 as light source light.
　このように、本実施形態における光源部１６は、デジタル・ライト・プロセッシング（Digital Light Processing：ＤＬＰ）プロジェクタと同様の構成である。なお、光源部１６は、他のプロジェクタ、例えば液晶ディスプレイ（Liquid Crystal Display：ＬＣＤ）プロジェクタなどと同様の構成でも良い。なお、透明散乱板１５による光源光の透過および散乱の動作は、上記第１，第２の実施形態と同様である。 As described above, the light source unit 16 in the present embodiment has the same configuration as that of a digital light processing (DLP) projector. The light source unit 16 may have the same configuration as other projectors such as a liquid crystal display (LCD) projector. The operation of transmitting and scattering light source light by the transparent scattering plate 15 is the same as in the first and second embodiments.
　＜４．２　動作＞
　図２０は、本実施形態における１サブフレーム期間の動作を説明するための図である。図２０では、１サブフレーム期間におけるカラーホイール４２の透過光色とＤＭＤ４４の状態とを示している。１サブフレーム期間は、液晶パネル１４の過渡応答期間（以下「液晶過渡応答期間」という。）と液晶パネル１４の過渡応答期間終了後の期間（以下「液晶応答完了期間」という。）とに分けられるものとする。液晶過渡応答期間では液晶パネル１４の画素形成部１４１の透過率が所望の値に向かって変化し、液晶応答完了期間では当該画素形成部１４１の透過率が所望の値となっている。 <4.2 Operation>
FIG. 20 is a diagram for explaining the operation in one subframe period in the present embodiment. FIG. 20 shows the transmitted light color of the color wheel 42 and the state of the DMD 44 in one subframe period. One subframe period is divided into a transient response period of the liquid crystal panel 14 (hereinafter referred to as “liquid crystal transient response period”) and a period after the end of the transient response period of the liquid crystal panel 14 (hereinafter referred to as “liquid crystal response completion period”). Shall be. In the liquid crystal transient response period, the transmittance of the pixel formation portion 141 of the liquid crystal panel 14 changes toward a desired value, and in the liquid crystal response completion period, the transmittance of the pixel formation portion 141 becomes a desired value.
　図２０に示すように、カラーホイール４２は、液晶過渡応答期間ではランプ４１からの白色光を遮断し（透過光色が黒（Ｋ）であるとも言える。）、液晶応答完了期間ではＲ，Ｇ，Ｂの光をＤＭＤ４４に順次照射する。なお、ＤＭＤ４４に照射する光の色順は特に限定されるものではない。また、ＤＭＤ４４は、液晶過渡応答期間ではオフ状態を維持し、液晶応答完了期間では所望の期間にオン状態になる。このようにして、所望の色の光源光が実現される。なお、図２０では、上述の第１色αの実現例を示している。 As shown in FIG. 20, the color wheel 42 blocks white light from the lamp 41 during the liquid crystal transient response period (it can also be said that the transmitted light color is black (K)), and R, G during the liquid crystal response completion period. , B are sequentially applied to the DMD 44. Note that the color order of the light applied to the DMD 44 is not particularly limited. In addition, the DMD 44 maintains an off state during the liquid crystal transient response period, and turns on during a desired period during the liquid crystal response completion period. In this way, light source light of a desired color is realized. Note that FIG. 20 illustrates an implementation example of the first color α described above.
　＜４．３　効果＞
　本実施形態によれば、光照射部（ランプ４１、カラーホイール４２、集光レンズ４３、ＤＭＤ４４、および投影レンズ４５）によって、複数のエリア３１に対応する光源光を立ち上げミラー４６に照射し、複数のエリア３１に対応する光源光を透明散乱板１５に向けて立ち上げミラー４６に反射させることにより、上記第１の実施形態と同様に、サブフレーム期間毎に複数色のいずれかに対応した色の光源光が液晶パネル１４の各エリア３１のそれぞれに独立して照射される。このようにして、上記第１の実施形態と同様の効果を奏することができる。 <4.3 Effects>
According to the present embodiment, the light emitting unit (the lamp 41, the color wheel 42, the condensing lens 43, the DMD 44, and the projection lens 45) irradiates the rising mirror 46 with the light source light corresponding to the plurality of areas 31, By reflecting the light source light corresponding to the plurality of areas 31 toward the transparent scattering plate 15 to the rising mirror 46, it corresponds to one of a plurality of colors for each subframe period as in the first embodiment. The color light source light is irradiated to each of the areas 31 of the liquid crystal panel 14 independently. In this way, the same effects as those of the first embodiment can be obtained.
　また、本実施形態によれば、カラーホイール４２と、エリア３１毎にオン状態とオフ状態とを切り替え可能なＤＭＤ４４とが使用される。エリア３１毎に各原色の点灯時間比率を適切に設定することにより、各サブフレーム期間で、所望の色の光源光がエリア３１に確実に照射される。 Further, according to the present embodiment, the color wheel 42 and the DMD 44 that can be switched between the on state and the off state for each area 31 are used. By appropriately setting the lighting time ratio of each primary color for each area 31, the light source light of a desired color is reliably irradiated to the area 31 in each subframe period.
　また、本実施形態によれば、液晶過渡応答期間を考慮しつつ、各原色の点灯時間比率を適切に設定できるので、各サブフレーム期間で、所望の色の光源光を確実に実現することができる。 In addition, according to the present embodiment, the lighting time ratio of each primary color can be appropriately set in consideration of the liquid crystal transient response period, so that the light source light of a desired color can be reliably realized in each subframe period. it can.
　また、本実施形態によれば、液晶過渡応答期間においてカラーホイール４２がランプ４１からの白色光を遮断するので、各サブフレーム期間で、所望の色の光源光をより確実に実現することができる。 Further, according to the present embodiment, since the color wheel 42 blocks the white light from the lamp 41 during the liquid crystal transient response period, the light source light of a desired color can be more reliably realized in each subframe period. .
　ところで、本実施形態における光源部１６の構成は、従来のプロジェクタと同様であるが、本実施形態における画像表示と従来のプロジェクタによる画像表示とは次の点で異なる。すなわち、従来のプロジェクタから、一般的なスクリーンに至近距離で画像を投影するとピント合わせが困難となり、表示品位が低下する。これに対して、本実施形態では、光源部１６から画像が投影されるのではなく光源光が照射され、液晶パネル１４で透過率制御を行うことによって画像が表示されるので、ピント合わせを考慮する必要がない。このため、本実施形態では、スクリーン部の至近距離に光源部１６を配置したとしても、表示品位は低下しない。 By the way, although the structure of the light source part 16 in this embodiment is the same as that of the conventional projector, the image display in this embodiment and the image display by the conventional projector differ in the following points. That is, if an image is projected from a conventional projector onto a general screen at a close distance, focusing becomes difficult and display quality is deteriorated. On the other hand, in the present embodiment, the image is not projected from the light source unit 16 but is irradiated with the light source light, and the image is displayed by performing the transmittance control on the liquid crystal panel 14. There is no need to do. For this reason, in this embodiment, even if the light source unit 16 is arranged at a close distance of the screen unit, the display quality is not deteriorated.
　＜５．その他＞
　本発明は、上述の実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で種々変形して実施することができる。例えば、各実施形態において、画像表示装置１０は、各エリア３１に独立して光源光を照射することにより色割れを抑制できるように構成されていれば良く、各サブフレーム期間で所望の色の光源光の照射を行うことが必須ではない。 <5. Other>
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in each embodiment, the image display device 10 only needs to be configured to suppress color breakup by irradiating each area 31 with light source light independently, and a desired color can be obtained in each subframe period. It is not essential to irradiate the light source light.
　また、各実施形態において、透明散乱板１５に代えて高分子分散型液晶（Polymer Dispersed Liquid Crystal：ＰＤＬＣ）パネルが使用されても良い。この場合、画像表示時にはＰＤＬＣパネルを散乱状態にし、背景透過時にはＰＤＬＣパネルを透過状態にすることにより、画像表示および背景透過をより高品質で行うことができる。また、ＰＤＬＣパネルの一部分を散乱状態にし、残りの部分を透過状態にしても良い。これにより、液晶パネル１４の一部分での画像表示および残りの部分で背景透過を高品質で行うことができる。この場合、ＰＤＬＣパネルは、光源光の一部を液晶パネル１４に照射すると共に、背景光の一部を透過する光制御部として機能する。 In each embodiment, a polymer dispersed liquid crystal (Polymer Dispersed Liquid Crystal: PDLC) panel may be used instead of the transparent scattering plate 15. In this case, when the image is displayed, the PDLC panel is set in a scattering state, and when the background is transmitted, the PDLC panel is set in a transmissive state, whereby image display and background transmission can be performed with higher quality. Further, a part of the PDLC panel may be in a scattering state, and the remaining part may be in a transmissive state. As a result, image display on a part of the liquid crystal panel 14 and background transmission on the remaining part can be performed with high quality. In this case, the PDLC panel functions as a light control unit that irradiates part of the light source light onto the liquid crystal panel 14 and transmits part of the background light.
　また、上記第１，第２の実施形態において、単位光源１７の数をエリア３１の数よりも多くすると共に、１つのエリア３１に２つ以上の単位光源１７を対応させても良い。 Further, in the first and second embodiments, the number of unit light sources 17 may be made larger than the number of areas 31 and two or more unit light sources 17 may correspond to one area 31.
　また、上記第１～第３の実施形態において、レンズ１７３に代えて、発光素子組１７１（発光素子）からの光の照射範囲を定めることができる他の光学素子を使用しても良い。 In the first to third embodiments, instead of the lens 173, another optical element that can determine the irradiation range of light from the light emitting element set 171 (light emitting element) may be used.
　また、上記第４の実施形態において、上記第２の実施形態と同様に、液晶パネル１４を介して透明散乱板１５に光源光を照射するようにしても良い。この場合、透明散乱板１５に代えてハーフミラーなどを使用しても良い。 In the fourth embodiment, similarly to the second embodiment, the transparent scattering plate 15 may be irradiated with light source light via the liquid crystal panel 14. In this case, a half mirror or the like may be used instead of the transparent scattering plate 15.
　また、上記第１の実施形態において、スクリーン部背面側の斜め上方に光源部１６を配置するようにしても良い。また、上記第２の実施形態において、スクリーン部正面側の斜め上方に光源部１６を配置するようにしても良い。また、上記第４の実施形態において、スクリーン部の下方に光源部１６を配置するようにしても良い。 In the first embodiment, the light source unit 16 may be disposed obliquely above the screen unit rear side. Moreover, in the said 2nd Embodiment, you may make it arrange | position the light source part 16 diagonally upward of the screen part front side. In the fourth embodiment, the light source unit 16 may be disposed below the screen unit.
１０…画像表示装置
１１…表示制御回路
１２…パネル駆動回路
１３…光源駆動回路
１４…液晶パネル（表示パネル）
１５…透明散乱板（光制御部）
１６…光源部
１７…単位光源
１８…配置台
３１…エリア
４１…ランプ
４２…カラーホイール
４３…集光レンズ
４４…ＤＭＤ
４５…投影レンズ
４６…立ち上げミラー（反射部）
１４１…画素形成部
１７１…発光素子組
１７２…発光素子
１７３…レンズ（光学素子）
ＩＮ…入力信号 DESCRIPTION OF SYMBOLS 10 ... Image display apparatus 11 ... Display control circuit 12 ... Panel drive circuit 13 ... Light source drive circuit 14 ... Liquid crystal panel (display panel)
15 ... Transparent scattering plate (light controller)
16 ... Light source 17 ... Unit light source 18 ... Arrangement table 31 ... Area 41 ... Lamp 42 ... Color wheel 43 ... Condensing lens 44 ... DMD
45 ... Projection lens 46 ... Rising mirror (reflection part)
141... Pixel forming portion 171... Light emitting element group 172... Light emitting element 173.
IN: Input signal

Claims (13)

  1. 　与えられた入力信号の１フレーム期間を複数のサブフレーム期間に分割し、サブフレーム期間毎に複数色のいずれかに対応した色の表示を行うことによりカラー画像を表示する画像表示装置であって、
    　入射した光の透過率を制御する表示パネルと、
    　光源部と、
    　前記表示パネルに対向して配置され、前記光源部が出射した光の少なくとも一部の前記表示パネルへの照射および前記表示パネルが位置する側と反対側の主面から入射した光の少なくとも一部の透過が可能な光制御部とを備え、
    　前記光源部は、前記サブフレーム期間毎に複数色のいずれかに対応した色の光が前記表示パネルの複数のエリアのそれぞれに独立して前記光制御部から照射されるように、前記光制御部に光を照射することを特徴とする、画像表示装置。     An image display device that displays a color image by dividing one frame period of a given input signal into a plurality of subframe periods and displaying a color corresponding to one of a plurality of colors for each subframe period. ,
    A display panel for controlling the transmittance of incident light;
    A light source unit;
    Irradiation of at least a part of the light emitted from the light source unit, which is arranged facing the display panel, to the display panel and at least a part of the light incident from the main surface opposite to the side where the display panel is located A light control unit capable of transmitting
    The light source unit controls the light control so that light of a color corresponding to one of a plurality of colors is emitted from the light control unit independently to each of the plurality of areas of the display panel for each subframe period. An image display device that irradiates light to a part.
  2. 　前記光源部は、前記複数のエリアにそれぞれ対応した複数の単位光源を含み、
    　前記単位光源は、
    　　複数の原色にそれぞれ対応した複数の発光素子からなる発光素子組と、
    　　前記発光素子組からの光の照射範囲を定める光学素子とを含むことを特徴とする、請求項１に記載の画像表示装置。     The light source unit includes a plurality of unit light sources respectively corresponding to the plurality of areas,
    The unit light source is
    A light-emitting element group composed of a plurality of light-emitting elements respectively corresponding to a plurality of primary colors;
    The image display apparatus according to claim 1, further comprising: an optical element that defines an irradiation range of light from the light emitting element group.
  3. 　前記光源部は、各エリアに対応すると共に、複数の原色にそれぞれ対応した複数の単位光源を含み、
    　各原色に対応した単位光源は、
    　　当該原色に対応した発光素子と、
    　　前記発光素子からの光の照射範囲を定める光学素子とを含むことを特徴とする、請求項１に記載の画像表示装置。     The light source unit includes a plurality of unit light sources corresponding to each area and corresponding to a plurality of primary colors,
    The unit light source corresponding to each primary color is
    A light emitting device corresponding to the primary color;
    The image display apparatus according to claim 1, further comprising an optical element that defines an irradiation range of light from the light emitting element.
  4. 　前記光源部は、前記単位光源を前記表示パネルに向けて配置するための配置台をさらに含み、
    　前記単位光源の前記光学素子が定める前記照射範囲は、当該単位光源の位置が前記表示パネルに近いほど広く、
    　前記単位光源の配置間隔は、前記表示パネルに近いほど広いことを特徴とする、請求項２または３に記載の画像表示装置。     The light source unit further includes an arrangement table for arranging the unit light sources toward the display panel,
    The irradiation range defined by the optical element of the unit light source is wider as the position of the unit light source is closer to the display panel,
    The image display device according to claim 2, wherein an interval between the unit light sources is wider as it is closer to the display panel.
  5. 　各原色に対応した発光素子は、各サブフレーム期間で任意の発光状態を取り得ることを特徴とする、請求項２または３に記載の画像表示装置。 4. The image display device according to claim 2, wherein the light emitting element corresponding to each primary color can take an arbitrary light emitting state in each subframe period.
  6. 　前記光源部は、
    　　前記光制御部に向けて光を反射する反射部と、
    　　前記サブフレーム期間毎に複数色のいずれかに対応した色の光が前記表示パネルの複数のエリアのそれぞれに独立して前記光制御部から照射されるように、前記複数のエリアに対応する光を前記反射部に照射する光照射部とを含むことを特徴とする、請求項１に記載の画像表示装置。     The light source unit is
    A reflection part that reflects light toward the light control part;
    Light corresponding to the plurality of areas so that light of a color corresponding to one of the plurality of colors is emitted from the light control unit independently to each of the plurality of areas of the display panel for each subframe period. The image display apparatus according to claim 1, further comprising: a light irradiation unit that irradiates the reflection unit.
  7. 　前記光照射部は、
    　　白色光をフルカラー化するためのカラーホイールと、
    　　前記カラーホイールからの光を反射するオン状態と当該光を反射しないオフ状態とを前記エリア毎に切り替え可能なデジタルマイクロミラーデバイスとを含むことを特徴とする、請求項６に記載の画像表示装置。     The light irradiator is
    A color wheel for full color white light,
    The image display apparatus according to claim 6, further comprising: a digital micromirror device capable of switching for each area an on state in which light from the color wheel is reflected and an off state in which the light is not reflected. .
  8. 　前記表示パネルは液晶パネルであり、
    　前記デジタルマイクロミラーデバイスは、各サブフレーム期間において、前記液晶パネルの過渡応答期間終了後の所望の期間にオン状態になることを特徴とする、請求項７に記載の画像表示装置。     The display panel is a liquid crystal panel;
    8. The image display apparatus according to claim 7, wherein the digital micromirror device is turned on in a desired period after the end of the transient response period of the liquid crystal panel in each subframe period.
  9. 　前記カラーホイールは、前記液晶パネルの過渡応答期間において前記白色光を遮断することを特徴とする、請求項８に記載の画像表示装置。 The image display device according to claim 8, wherein the color wheel blocks the white light during a transient response period of the liquid crystal panel.
  10. 　前記光源部は、前記サブフレーム期間毎に、異なるエリアに異なる色の光が前記表示パネルの複数のエリアのそれぞれに独立して前記光制御部から照射可能なように、前記光制御部に光を照射することを特徴とする、請求項１に記載の画像表示装置。 The light source unit emits light to the light control unit so that light of different colors can be emitted from the light control unit independently to each of the plurality of areas of the display panel for each subframe period. The image display device according to claim 1, wherein:
  11. 　前記光源部は、前記表示パネルが位置する側と反対側の前記光制御部の主面に光を照射することを特徴とする、請求項１に記載の画像表示装置。 The image display device according to claim 1, wherein the light source unit irradiates light to a main surface of the light control unit on a side opposite to a side on which the display panel is located.
  12. 　前記光源部は、前記表示パネルが位置する側の前記光制御部の主面に光を照射することを特徴とする、請求項１に記載の画像表示装置。 The image display device according to claim 1, wherein the light source unit irradiates light to a main surface of the light control unit on a side where the display panel is located.
  13. 　入射した光の透過率を制御する表示パネルと、光源部と、前記表示パネルに対向して配置され、前記光源部が出射した光の少なくとも一部の前記表示パネルへの照射および前記表示パネルが位置する側と反対側の主面から入射した光の少なくとも一部の透過が可能な光制御部とを含み、与えられた入力信号の１フレーム期間を複数のサブフレーム期間に分割し、サブフレーム期間毎に複数色のいずれかに対応した色の表示を行うことによりカラー画像を表示する画像表示装置の駆動方法であって、
    　前記表示パネルを複数のエリアに分割し、前記サブフレーム期間毎に複数色のいずれかに対応した色の光が各エリアに独立して前記光制御部から照射されるように、前記光制御部に光を照射するステップを備えることを特徴とする、駆動方法。     A display panel for controlling the transmittance of incident light, a light source unit, and the display panel are disposed so as to face the display panel, and at least a part of the light emitted from the light source unit is irradiated on the display panel and the display panel A light control unit capable of transmitting at least part of the light incident from the main surface opposite to the positioned side, and dividing one frame period of a given input signal into a plurality of subframe periods, A method of driving an image display device that displays a color image by displaying a color corresponding to one of a plurality of colors for each period,
    The light control unit is configured such that the display panel is divided into a plurality of areas, and light of a color corresponding to any of a plurality of colors is emitted from the light control unit independently to each area for each subframe period. A driving method comprising the step of irradiating light to the head.
PCT/JP2013/081712 2012-12-04 2013-11-26 Image display device and method for driving same WO2014087876A1 (en)

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