WO2014087876A1 - Dispositif d'affichage d'image et son procédé de pilotage - Google Patents

Dispositif d'affichage d'image et son procédé de pilotage 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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WIPO (PCT)
Prior art keywords
light
light source
unit
color
display panel
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PCT/JP2013/081712
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English (en)
Japanese (ja)
Inventor
朋幸 石原
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シャープ株式会社
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Publication of WO2014087876A1 publication Critical patent/WO2014087876A1/fr

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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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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

L'invention concerne un dispositif d'affichage d'image capable d'améliorer l'efficacité d'utilisation d'une lumière de source de lumière et de transmettre un fond tout en supprimant une diminution de la qualité d'affichage et une augmentation de taille. Le dispositif d'affichage d'image inclut un panneau à cristaux liquides (14), une plaque de diffusion transparente (15) en regard du panneau à cristaux liquides (14), et une unité de source de lumière (16) positionnée en diagonale vers le bas sur un côté de surface arrière du panneau à cristaux liquides (14) et de la plaque de diffusion transparente (15). L'unité de source de lumière (16) inclut une pluralité de sources de lumière unitaires (17) correspondant à chacune d'une pluralité de zones du panneau à cristaux liquides (14). La lumière entrant par la surface arrière de la plaque de diffusion transparente (15) est diffusée et dirigée sur le panneau à cristaux liquides (14). La lumière entrant par la surface arrière de la plaque de diffusion transparente (15) est également transmise et dirigée sur le panneau à cristaux liquides (14). Dans une zone d'affichage d'image, la transmittance est adéquatement commandée, une image étant affichée sur la base de la lumière de la source de lumière. Au niveau d'une zone non affichage d'image, la transmittance est fixée de façon à être relativement élevée, et un fond est ainsi transmis.
PCT/JP2013/081712 2012-12-04 2013-11-26 Dispositif d'affichage d'image et son procédé de pilotage WO2014087876A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016104340A1 (fr) * 2014-12-26 2016-06-30 シャープ株式会社 Dispositif d'affichage et son procédé de pilotage

Citations (6)

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Publication number Priority date Publication date Assignee Title
JP2000098489A (ja) * 1998-09-22 2000-04-07 Fuji Xerox Co Ltd 映像投影装置
JP2000122589A (ja) * 1998-10-13 2000-04-28 Fuji Xerox Co Ltd 映像表示装置
JP2004523001A (ja) * 2001-02-27 2004-07-29 ザ ユニバーシティ オブ ブリティッシュ コロンビア 高ダイナミック・レンジ表示装置
WO2008047862A1 (fr) * 2006-10-19 2008-04-24 Sharp Kabushiki Kaisha Dispositif de commande de diodes électroluminescentes, dispositif d'éclairage et dispositif d'affichage
WO2011104979A1 (fr) * 2010-02-26 2011-09-01 シャープ株式会社 Dispositif d'affichage d'image
WO2012157554A1 (fr) * 2011-05-18 2012-11-22 シャープ株式会社 Dispositif d'affichage d'images et procédé d'affichage d'images

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000098489A (ja) * 1998-09-22 2000-04-07 Fuji Xerox Co Ltd 映像投影装置
JP2000122589A (ja) * 1998-10-13 2000-04-28 Fuji Xerox Co Ltd 映像表示装置
JP2004523001A (ja) * 2001-02-27 2004-07-29 ザ ユニバーシティ オブ ブリティッシュ コロンビア 高ダイナミック・レンジ表示装置
WO2008047862A1 (fr) * 2006-10-19 2008-04-24 Sharp Kabushiki Kaisha Dispositif de commande de diodes électroluminescentes, dispositif d'éclairage et dispositif d'affichage
WO2011104979A1 (fr) * 2010-02-26 2011-09-01 シャープ株式会社 Dispositif d'affichage d'image
WO2012157554A1 (fr) * 2011-05-18 2012-11-22 シャープ株式会社 Dispositif d'affichage d'images et procédé d'affichage d'images

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016104340A1 (fr) * 2014-12-26 2016-06-30 シャープ株式会社 Dispositif d'affichage et son procédé de pilotage

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