WO2010084619A1 - Dispositif d'affichage à cristaux liquides, circuit d'attaque et procédé d'attaque - Google Patents

Dispositif d'affichage à cristaux liquides, circuit d'attaque et procédé d'attaque Download PDF

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Publication number
WO2010084619A1
WO2010084619A1 PCT/JP2009/051206 JP2009051206W WO2010084619A1 WO 2010084619 A1 WO2010084619 A1 WO 2010084619A1 JP 2009051206 W JP2009051206 W JP 2009051206W WO 2010084619 A1 WO2010084619 A1 WO 2010084619A1
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Prior art keywords
image data
correction
color
liquid crystal
crystal display
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PCT/JP2009/051206
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English (en)
Japanese (ja)
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中西　秀一
加藤　厚志
飯坂　英仁
宏行 保坂
拓 北川
Original Assignee
Ｎｅｃディスプレイソリューションズ株式会社
セイコーエプソン株式会社
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Priority to JP2010547372A priority Critical patent/JP5413987B2/ja
Priority to PCT/JP2009/051206 priority patent/WO2010084619A1/fr
Publication of WO2010084619A1 publication Critical patent/WO2010084619A1/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
    • G09G3/36—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
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0252—Improving the response speed
    • 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
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous frame

Definitions

  • the present invention relates to a liquid crystal display device, a liquid crystal display element driving circuit, a color image generation method, and a liquid crystal display element driving method.
  • color display systems for liquid crystal display devices such as projectors or direct-view displays.
  • Patent Document 1 describes a single-plate color liquid crystal display device.
  • the single-plate color liquid crystal display device includes a pixel having an R color (red) color filter, a pixel having a G color (green) color filter, and a pixel having a B color (blue) color filter. Color display using these pixels.
  • Patent Document 2 describes a liquid crystal display device adopting an FSC (Field Sequential Color) system as a color display system.
  • FSC Field Sequential Color
  • the FSC type liquid crystal display device In the FSC type liquid crystal display device, light of different colors is sequentially irradiated onto one monochrome liquid crystal display element, and the display image of the liquid crystal display element is synchronized with the switching of light (color). The image can be switched according to the color.
  • one frame period constituting one screen is divided into a plurality of color field periods according to the color of the irradiation light.
  • an image corresponding to the color of the color field is formed on one monochrome liquid crystal display element, and light having the color of the color field is irradiated to the liquid crystal display element.
  • the light irradiated to the liquid crystal display element is modulated and output by an image formed on the liquid crystal display element.
  • a p-Si (polycrystalline silicon) TFT (Thin Film Transistor) circuit is often formed as an operation control element.
  • the TFT circuit is used to apply image data in the video signal to the liquid crystal in the pixel.
  • the plurality of pixels in the liquid crystal display element are arranged in a matrix and scanned as follows.
  • the plurality of pixels are selected in order for each row.
  • the image data is sequentially transferred to a plurality of selected pixels in the same row. For this reason, a difference occurs in the transfer timing (supply timing) of the image data between the pixels in the liquid crystal display element.
  • FIG. 1 is an explanatory diagram for explaining a frame, a color field, and a pixel scanning timing in the FSC system.
  • one frame has three colors including a field R (Field-R: red field), a field G (Field-G: green field), and a field B (Field-B: blue field). It is divided into fields.
  • All the pixels in the liquid crystal display element are scanned in order from the top row to the bottom row in each color field.
  • liquid crystal display devices have the following characteristics.
  • the liquid crystal display element has a slow optical response (light transmittance response).
  • the p-Si TFT circuit formed on the liquid crystal display element has a low operating frequency, it takes time to transfer the video signal.
  • the image data is transferred to the pixel by the TFT circuit, the image data is immediately applied to the liquid crystal in the pixel.
  • All the pixels of the liquid crystal display element are simultaneously illuminated with the same color light.
  • Response characteristics of light transmittance are different between a change from black to white and a change from white to black.
  • the response characteristic of the light transmittance varies depending on the wavelength.
  • FIG. 2 is an explanatory diagram for explaining a malfunction phenomenon in the FSC method due to the features [1] to [4].
  • one frame is divided into three color fields including field R (Field-R), field G (Field-G), and field B (Field-B).
  • a video signal corresponding to R color (hereinafter referred to as “R color video signal”) is transferred to a liquid crystal display element (LCD).
  • R color video signal a video signal corresponding to R color
  • G color video signal a video signal corresponding to G color
  • B color video signal a video signal corresponding to B color
  • the R color video signal includes a plurality of R color image data that can correspond one-to-one to the pixels of the liquid crystal display element.
  • Each of the R color image data (hereinafter referred to as “R color image data”) is image information (video information) of a corresponding pixel, and is data indicating a gradation.
  • the G color video signal includes a plurality of image data for G color that can correspond one-to-one to the pixels of the liquid crystal display element.
  • Each of the G color image data (hereinafter referred to as “G color image data”) is image information (video information) of a corresponding pixel, and is data indicating a gradation.
  • the B color video signal includes a plurality of B color image data that can correspond one-to-one to the pixels of the liquid crystal display element.
  • Each of the B-color image data (hereinafter referred to as “B-color image data”) is image information (video information) of a corresponding pixel, and is data indicating a gradation.
  • Graph A is a graph showing a change in light transmittance at a pixel to which image data is first transferred among a plurality of pixels in each color field.
  • Graph B is a graph showing a change in light transmittance at a pixel to which image data is transferred last among a plurality of pixels in each color field.
  • R-color LED light source lighting control, G-color LED light source lighting control, and B-color LED light source lighting control emit light of R color and LED (Light Emitting Diode) and G color light.
  • LCD light transmittance indicates the light transmittance of the pixels in the liquid crystal display element.
  • graph A and graph B have the same waveform but are out of phase. This phase shift depends on the position of the pixel in the liquid crystal display element, that is, the transfer timing of image data to each pixel.
  • the light transmittance of each pixel may differ at a predetermined timing such as when the light source is turned on due to a shift in the transfer timing of image data to each pixel and the features [1] to [3]. .
  • the amount of light passing through each pixel may be different (the area of the hatched part a and the area of the hatched part b are different). That is, the brightness differs for each pixel.
  • the color tone and gradation reproducibility differ depending on the position of the liquid crystal display element in the screen.
  • the liquid crystal display device is a so-called hold type that works to hold the display until the image data is updated.
  • the hold type is said to have poor video quality compared to the impulse type, which has a short time to illuminate the pixels with respect to the cycle of updating the image data.
  • As an improvement measure it is known to shorten the update cycle of image data.
  • Patent Documents 3 and 4 describe an FSC liquid crystal display capable of improving the problem of gradation reproducibility caused by the shift in the transfer timing of image data to each pixel and the features [1] to [4]. An apparatus is described.
  • Patent Documents 3 and 4 there is no description that image data (video signal) corresponding to another color is used when correcting image data (video signal) corresponding to a certain color.
  • Feature [5] is due to the fact that the response characteristics of the liquid crystal differ depending on the applied electric field.
  • the change from black to white is slower than the change from white to black. For this reason, when the liquid crystal display element has a normally white structure, the moving image quality deteriorates particularly when a dark image changes to a bright image. On the other hand, when the liquid crystal display element has a normally black structure, the moving image quality deteriorates particularly when the light image changes to a dark image.
  • feature [5] also deteriorates the quality of still images in the FSC system.
  • the liquid crystal display element when the liquid crystal display element is normally white, the primary color is not bright, and when the liquid crystal display element is normally black, the complementary color of the primary color is whitish.
  • the FSC system when displaying chromatic colors, it may be difficult to reproduce depending on the display color.
  • Liquid crystal display elements include TN mode, IPS (In-Plane Switching) mode, VA (Vertical Aligned) mode, and OCB (Optically Compensated Bend) mode.
  • TN mode In-Plane Switching
  • VA Very Aligned
  • OCB Optically Compensated Bend
  • Patent Document 5 describes a liquid crystal display device in which a color image is generated by the FSC method, and a level correction circuit provided for each color corrects a video signal of a color corresponding to its own circuit.
  • This level correction circuit corrects the video signal of the color corresponding to the self in order to correct the characteristic [6] that the response characteristic of the light transmittance varies depending on the wavelength.
  • the liquid crystal display device described in Patent Document 5 includes level correction circuits 32R, 32G, and 32B.
  • the level correction circuit 32R receives the red video signal and corrects the red video signal according to the red response characteristic.
  • the level correction circuit 32G receives the green video signal and corrects the green video signal according to the green response characteristic.
  • the level correction circuit 32B receives the blue video signal and corrects the blue video signal according to the blue response characteristic.
  • the liquid crystal display device sequentially controls each pixel. Therefore, when attention is paid to a certain pixel, the pixel is accessed only during a part of a predetermined period. During the partial period, a voltage V for controlling the liquid crystal is applied to the pixel.
  • the pixel has a capacitive component C. Therefore, by applying the control voltage V to the pixel, the charge Q corresponding to the control voltage V is supplied to the pixel electrode.
  • the pixel capacitance C has a property of changing depending on the orientation (director) of the liquid crystal of the pixel.
  • a so-called overdrive method is known as a method for solving the problem that a desired charge amount cannot be supplied in one access (see Patent Documents 6 and 7).
  • Overdrive applies the desired amount of charge by applying an excessive voltage to the pixel that is different from the voltage when the director is in the desired director state, depending on which state the director is changed from to which state. This is a method of supplying the pixel.
  • overdrive also has an aspect of improving a problem caused by a slow response of the liquid crystal, that is, a problem caused by the feature [1].
  • Patent Documents 6 and 7 are a technique for correcting a video signal of a certain frame using the video signal of the immediately preceding frame. That is, Patent Documents 6 and 7 describe techniques for applying overdrive in a liquid crystal display device different from the FCS method.
  • Patent Document 7 describes a liquid crystal display device that changes the degree of correction of a video signal by overdrive in accordance with the position on the display screen of a pixel to which the video signal is transferred.
  • this liquid crystal display device a plurality of pixels arranged in a matrix are scanned one by one in order from the uppermost row to the lowermost row, and image data is selected for the pixels in the selected row. Are transferred in order.
  • the image data transferred to the pixel located at the center of the display screen that is easily watched is corrected by overdrive rather than the image data transferred to the pixel located at the edge of the display screen. Increase the degree.
  • Patent Document 7 describes a three-plate color liquid crystal display device to which overdrive is applied.
  • FIG. 3 is a block diagram showing a three-plate color liquid crystal display device 100 to which overdrive is applied.
  • a three-plate color liquid crystal display device 100 includes an R color frame memory 101R, a G color frame memory 101G, a B color frame memory 101B, an R color overdrive control unit 102R, and a G color.
  • the R color frame memory 101R, the R color overdrive control unit 102R, and the R color liquid crystal display element 103R are devices of the R color system.
  • the G color frame memory 101G, the G color overdrive control unit 102G, and the G color liquid crystal display element 103G are devices of the G color system.
  • the B color frame memory 101B, the B color overdrive control unit 102B, and the B color liquid crystal display element 103B are devices of the B color system.
  • the R color liquid crystal display element 103R displays an image corresponding to the R color.
  • the G color liquid crystal display element 103G displays an image corresponding to the G color.
  • the B color liquid crystal display element 103B displays an image corresponding to the B color.
  • the voltage applied to the pixel (correction signal) is controlled according to the target state and start state of the liquid crystal director.
  • each overdrive control unit 102R, 102G, and 102B inputs the video signal of its own frame to be displayed and the video signal of the previous frame read from the same frame memory, A correction signal for driving the liquid crystal display element is generated.
  • the pixel displays an image corresponding to one color and always receives the same illumination light.
  • the three-plate type color liquid crystal display device 100 is overdriven in accordance with the state transition of the liquid crystal director between frames, which is the video update cycle.
  • Patent Documents 6 and 7 there is a description about overdrive, but there is no description that overdrive is used in an FSC liquid crystal display device.
  • Patent Documents 3 and 4 when a video signal for displaying the same luminance is applied to all the pixels, the light is transmitted to each pixel so that the light transmittance in each pixel is equal when the light is irradiated.
  • an FSC liquid crystal display device that corrects the image data to be displayed is described, when correcting a video signal (image data) corresponding to a certain color, the video signal (image data) corresponding to another color is corrected. There is no statement to use.
  • Patent Document 3 or 4 cannot be used as an overdrive correction technique in an FSC liquid crystal display device.
  • the level correction circuit described in Patent Document 5 specifically, a level correction circuit that accepts only a video signal of a color corresponding to its own circuit and corrects the video signal of that color is also an FSC liquid crystal display device. Cannot be used as a correction circuit for overdrive.
  • Patent Document 1 describes a single-plate color liquid crystal display device, but does not describe an FSC liquid crystal display device.
  • Patent Document 2 describes an FSC type liquid crystal display device, but when correcting a video signal (image data) corresponding to a certain color, a video signal (image data) corresponding to another color is used. There is no statement to that effect.
  • Patent Documents 1 to 7 describes a technology that is a prerequisite for the occurrence of this problem, specifically, a technology that applies overdrive in an FSC liquid crystal display device.
  • Patent Documents 1 to 7 naturally transfer the image data to each pixel when the above-described problem, specifically, overdrive is applied to the FSC liquid crystal display device.
  • the problem that the problem of gradation reproducibility due to the timing shift and the slow response of the liquid crystal occurs has not been solved.
  • An object of the present invention is to provide a liquid crystal display device, a liquid crystal display element drive circuit, a color image generation method, and a liquid crystal display element drive method capable of solving the above-described problems.
  • the liquid crystal display device When the liquid crystal display device according to the present invention receives a plurality of video signals corresponding to a plurality of colors and having a plurality of image data, a plurality of corrected image data obtained by correcting each image data in the video signal for each of the video signals.
  • a correction unit that outputs a correction signal
  • an output control unit that sequentially outputs a plurality of correction signals output from the correction unit one by one, and each time the correction signal is output from the output control unit
  • the irradiation means for emitting light of a color corresponding to the video signal that is the source of the correction signal, and a plurality of pixels.
  • Each corrected image data is sequentially supplied to a pixel corresponding to the corrected image data among the plurality of pixels, and the light from the irradiation unit is changed using the plurality of pixels to which the corrected image data is supplied.
  • the liquid crystal display element that outputs the image data, and the correction means supplies each image data in the video signal, the order of supply of the corrected image data obtained by correcting the image data in the liquid crystal display element, and the correction A correction signal having a plurality of corrected image data corrected based on other image data that is the basis of other corrected image data supplied immediately before or immediately after the corrected image data to pixels corresponding to the image data.
  • the drive circuit has a plurality of pixels, and each time a correction signal having a plurality of correction image data is received, each correction image data in the correction signal is sequentially input to the correction image of the plurality of pixels.
  • a liquid crystal display element that supplies a pixel corresponding to data and modulates and outputs light of a color corresponding to a video signal that is a source of the correction signal using a plurality of pixels to which the correction image data is supplied.
  • Correction means for outputting a correction signal; and output control means for outputting a plurality of correction signals outputted from the correction means to the liquid crystal display element one by one in order, Each image data in the image signal is supplied to the pixel corresponding to the corrected image data immediately before or after the corrected image data in the order of supply of the corrected image data obtained by correcting the image data in the liquid crystal display element.
  • a correction signal having a plurality of corrected image data corrected based on the other image data that is the basis of the other corrected image data is output.
  • a color image generation method is a color image generation method performed by an FSC liquid crystal display device.
  • the color image generation method is performed for each video signal.
  • a correction signal having a plurality of corrected image data obtained by correcting each image data in the video signal is output, the plurality of correction signals are sequentially output one by one, and the correction signals are output one by one.
  • the light of the color corresponding to the video signal that is the source of the correction signal is emitted, and each time the correction signal is output from the output control means, each correction image data in the correction signal is output.
  • the plurality of pixels are supplied to the pixel corresponding to the corrected image data, the plurality of pixels to which the corrected image data is supplied are used to modulate and output the light, and the plurality of corrected image data
  • the image data in the video signal is supplied to the pixels corresponding to the correction image data and the order of supply of the correction image data obtained by correcting the image data to the plurality of pixels.
  • a correction signal having a plurality of corrected image data corrected based on the other image data that is the source of the other corrected image data supplied immediately before or after the corrected image data is output.
  • the driving method includes a plurality of pixels, and each time a correction signal having a plurality of correction image data is received, the correction image data in the correction signal is sequentially input to the correction image of the plurality of pixels.
  • a liquid crystal display element that supplies a pixel corresponding to data and modulates and outputs light of a color corresponding to a video signal that is a source of the correction signal using a plurality of pixels to which the correction image data is supplied.
  • each of the video signals has a plurality of corrected image data obtained by correcting each image data in the video signal.
  • each image in the video signal is output.
  • the order of supply of the corrected image data in the liquid crystal display element, in which the image data is corrected, and other corrected image data supplied to the pixel corresponding to the corrected image data immediately before or after the corrected image data And a correction signal having a plurality of corrected image data corrected based on the other image data that is the source of the above.
  • the FSC liquid crystal display device it is possible to reduce the difference in gradation reproducibility and the color reproducibility depending on the position in the screen.
  • FIG. 1 is a block diagram showing a three-plate color liquid crystal display device 100 to which overdrive is applied.
  • 1 is a block diagram illustrating a liquid crystal display device 1 according to a first embodiment of the present invention.
  • 6 is an explanatory diagram showing an example of a liquid crystal display element 2.
  • FIG. 4 is a block diagram illustrating an example of a correction unit 3.
  • FIG. It is explanatory drawing for demonstrating the relationship between the position in a screen, and correction
  • 3 is a block diagram illustrating a correction unit 31.
  • FIG. 1 is a block diagram showing a three-plate color liquid crystal display device 100 to which overdrive is applied.
  • 1 is a block diagram illustrating a liquid crystal display device 1 according to a first embodiment of the present invention.
  • 6 is an explanatory diagram showing an example of a liquid crystal display element 2.
  • FIG. 4 is a block diagram illustrating an example of a correction unit 3.
  • FIG. It is explanatory drawing for demonstrating the relationship
  • FIG. 3 is a block diagram showing a correction unit 32.
  • FIG. 6 is a block diagram illustrating a correction unit 33. It is explanatory drawing for demonstrating the relationship between the position in a screen, and correction
  • FIG. 4 is a block diagram showing the liquid crystal display device 1 according to the first embodiment of the present invention.
  • the liquid crystal display device 1 includes a liquid crystal display element 2, a correction unit 3, a data rearrangement unit 4, and an irradiation unit 5.
  • the data rearrangement unit 4 includes a frame memory 4a and a memory control unit 4b.
  • the irradiation unit 5 includes an illumination unit 5a and a timing control unit 5b.
  • the liquid crystal display device 1 receives a plurality of video signals corresponding to each of a plurality of colors on a one-to-one basis (hereinafter simply referred to as “a plurality of video signals”).
  • the liquid crystal display device 1 is an FSC liquid crystal display device that displays a color image by sequentially displaying a plurality of color images corresponding to a plurality of video signals.
  • Each video signal has a plurality of image data.
  • Each image data in the video signal corresponds to each of a plurality of pixels in the liquid crystal display element 2.
  • the order of arrangement of each image data in the video signal is associated with the order of supply to the plurality of pixels in the liquid crystal display element 2.
  • the liquid crystal display element 2 has a plurality of pixels.
  • the liquid crystal display element 2 uses a plurality of pixels, modulates the light applied to the liquid crystal display element 2 according to the drive signal, and outputs light for forming an image.
  • the liquid crystal display device 1 When the liquid crystal display device 1 is a projector (projection display device), the light modulated and output by the liquid crystal display element 2 is magnified by a projection optical system (not shown) and is applied to a screen (not shown). Projected. When the liquid crystal display device 1 is a direct view display device, the light modulated and output by the liquid crystal display element 2 reaches the eyes of the user.
  • a projection optical system not shown
  • a screen not shown
  • FIG. 5 is an explanatory view showing an example of the liquid crystal display element 2.
  • the liquid crystal display element 2 includes a plurality of pixels 2a, a gate driver 2b, a source driver 2c, a plurality of scanning lines 2d, a plurality of data lines 2e, and a common line 2f.
  • the plurality of pixels 2a are arranged in a matrix.
  • Each pixel 2a has a TFT circuit 2a1 and a liquid crystal capacitor 2a2.
  • the liquid crystal capacitor 2a2 has a configuration in which liquid crystal is interposed between the counter electrodes.
  • each TFT circuit 2a1 is connected to one end of a liquid crystal capacitor 2a2 present in the pixel 2a to which the TFT circuit 2a1 belongs.
  • the other end of the liquid crystal capacitor 2a2 is connected to the common line 2f.
  • a common voltage is supplied to the common line 2f.
  • the gates of the TFT circuits 2a1 existing in the same row are connected to the common scanning line 2d.
  • Each scanning line 2d is connected to the gate driver 2b.
  • the gate driver 2b starts vertical scanning (selection of scanning lines) for each field according to the vertical synchronizing signal synchronized with the output field synchronization timing, and selects the scanning lines 2d one by one in order according to the horizontal synchronizing signal. Then, a gate drive signal is supplied to the selected scanning line 2d.
  • the sources of the TFT circuits 2a1 existing in the same column are connected to the common data line 2e.
  • Each data line 2e is connected to the source driver 2c.
  • the source driver 2c starts horizontal scanning (selection of data line) for each scanning line according to the horizontal synchronization signal, and sequentially selects the data line 2e according to the transfer clock signal.
  • the source driver 2c selects image data corresponding to the pixel 2a specified by the selected data line 2e and the selected scanning line 2d (corrected image data obtained by correcting the image data in this embodiment). Supplied to the data line 2e.
  • the corrected image data supplied to the source of the TFT circuit 2a1 is supplied to the liquid crystal capacitor 2a2 via the drain of the TFT circuit 2a1. For this reason, the corresponding corrected image data is supplied to the pixel 2a specified by the selected data line 2e and the selected scanning line 2d via the TFT circuit 2a1.
  • the plurality of scanning lines 2d and the plurality of data lines 2e are arranged while maintaining electrical insulation from each other.
  • the gate driver 2b and the source driver 2c operate based on a timing signal (vertical synchronization signal) indicating a synchronization timing of the output field supplied from the timing control unit 5b, a horizontal synchronization signal, a transfer clock signal, and the like. Since this operation is a known technique, a detailed description thereof is omitted.
  • correction unit 3 can be generally called correction means.
  • the correction unit 3 inputs video signals of a plurality of colors synchronized with a timing signal indicating the synchronization timing of the input frame, and outputs a plurality of correction signals corresponding to the plurality of colors on a one-to-one basis.
  • the correction unit 3 receives a plurality of video signals each time a timing signal generated every frame period is received, and outputs a plurality of correction signals corresponding to the plurality of video signals on a one-to-one basis. Output.
  • the correction unit 3 when the correction unit 3 receives a plurality of video signals, the correction unit 3 outputs, for each video signal, a correction signal having a plurality of corrected image data obtained by correcting each image data in the video signal.
  • Each corrected image data in the correction signal corresponds to the image data that is the basis of the corrected image data. Since each image data corresponds to each of the plurality of pixels 2 a in the liquid crystal display element 2, each correction image data in the correction signal also corresponds to each of the plurality of pixels 2 a in the liquid crystal display element 2.
  • each of the corrected image data in the correction signal is supplied to the corresponding pixel.
  • the order of arrangement of each corrected image data in the correction signal is associated with the order of supply to the plurality of pixels 2 a in the liquid crystal display element 2.
  • the correction unit 3 accepts, as a plurality of video signals, an R color video signal corresponding to red, a G color video signal corresponding to green, and a B color video signal corresponding to blue.
  • the correction unit 3 outputs an R color correction signal corresponding to red, a G color correction signal corresponding to green, and a B color correction signal corresponding to blue as a plurality of correction signals.
  • the correction unit 3 generates an R color correction signal based on the R color video signal, generates a G color correction signal based on the G color video signal, and generates a B color correction signal based on the B color video signal. Generate.
  • the data rearrangement unit 4 can be generally called output control means.
  • the data rearrangement unit 4 outputs the plurality of correction signals output from the correction unit 3 to the liquid crystal display element 2 one by one as a drive signal.
  • the data rearrangement unit 4 uses the R color correction signal, the G color correction signal, and the B color correction signal as drive signals in the order of the R color correction signal, the G color correction signal, and the B color correction signal. Output to the liquid crystal display element 2. This order can be changed as appropriate.
  • the frame memory 4a is used as a buffer for rearranging a plurality of correction signals functioning as video signals.
  • the memory control unit 4b rearranges the plurality of correction signals output from the correction unit 3 in the order of output to the liquid crystal display element 2 on the frame memory 4a.
  • the memory control unit 4b performs the R color correction signal, the G color correction signal, and the B color correction signal in the order of the R color correction signal, the G color correction signal, and the B color correction signal on the frame memory 4a. Rearrange.
  • the memory control unit 4b outputs the R color correction signal, the G color correction signal, and the B color correction signal on the frame memory 4a to the liquid crystal display element 2 as drive signals one by one in the arrangement order. .
  • the irradiation unit 5 can be generally called irradiation means.
  • the irradiating unit 5 becomes the source of the correction signal output to the liquid crystal display element 2 each time one of the plurality of correction signals output from the correction unit 3 is output to the liquid crystal display element 2 as a drive signal.
  • the liquid crystal display element 2 is irradiated with light of a color corresponding to the video signal.
  • the irradiation unit 5 adjusts the light irradiation timing (period and phase) in consideration of the response of the light transmittance after the drive signal is output to the liquid crystal display element 2.
  • the illumination unit 5a includes an R color LED that emits red light, a G color LED that emits green light, and a B color LED that emits blue light.
  • the timing control unit 5b receives a timing signal indicating the synchronization timing of the input frame (hereinafter referred to as “input frame synchronization timing”), and outputs the synchronization timing of the output field (hereinafter referred to as “color frame period”).
  • a timing signal indicating "output field synchronization timing" is generated.
  • the input frame synchronization timing and the output field synchronization timing are synchronized, but they may be asynchronous.
  • the timing controller 5b generates a vertical synchronization signal, a horizontal synchronization signal, and a transfer clock signal synchronized with the output field synchronization timing, and supplies the vertical synchronization signal, the horizontal synchronization signal, and the transfer clock signal to the liquid crystal display element 2. To do.
  • the memory control unit 4 b uses the two timing signals (a timing signal indicating the input frame synchronization timing and a timing signal indicating the output field synchronization timing) from the timing control unit 5 b to change the input frame synchronization timing.
  • the writing to the frame memory 4a is controlled in synchronization, and the reading from the frame memory 4a is controlled in synchronization with the output field synchronization timing.
  • the memory control unit 4b applies the R color correction signal, the G color correction signal, and the B color correction signal on the frame memory 4a to the liquid crystal display element 2 as drive signals one by one in the arrangement order. Output.
  • the liquid crystal display element 2 sequentially receives the R color correction signal, the G color correction signal, and the B color correction signal sequentially output from the data rearrangement unit 4 in synchronization with the output field synchronization timing by the timing signal from the timing control unit 5b. input.
  • each correction in the correction signal is synchronized with the vertical synchronization signal, horizontal synchronization signal, and transfer clock signal from the timing controller 5b.
  • the image data is sequentially supplied to the pixel 2a corresponding to the corrected image data, the direction of the liquid crystal (director) of each pixel 2a is controlled, and each color light sequentially irradiated for each color is converted into the corrected image data. Modulation is performed using a plurality of pixels 2a in which the orientation of the liquid crystal is controlled by supply, and light that forms an image of each color is sequentially generated.
  • the illumination unit 5a lights up the R color LED, the G color LED, and the B color LED one by one in this order in synchronization with the output field synchronization timing by the timing signal from the timing control unit 5b.
  • the liquid crystal display device 1 operates as follows.
  • the illumination unit 5a turns on the R color LED and irradiates the liquid crystal display element 2 with the R color light.
  • the illumination unit 5a turns on the G color LED and irradiates the liquid crystal display element 2 with the G color light.
  • the illumination unit 5a turns on the B color LED and irradiates the liquid crystal display element 2 with B color light.
  • correction unit 3 will be described.
  • the correction unit 3 supplies each image data in the video signal in the order of supply of the corrected image data obtained by correcting the image data in the liquid crystal display element 2 (hereinafter simply referred to as “supply order”) and the corrected image. Based on other image data (hereinafter simply referred to as “other image data”) that is the source of other corrected image data supplied to the pixel corresponding to the data immediately before or after the corrected image data A correction signal having a plurality of corrected image data corrected is output.
  • the correction unit 3 outputs, for each video signal, a correction signal having a plurality of corrected image data obtained by correcting each image data in the video signal based on the supply order and other image data.
  • the function of the correction unit 3 is to improve the reduction in gradation reproducibility and color reproducibility due to the FSC method, and to reduce the difference in gradation reproducibility and color reproducibility depending on the position in the screen. It is.
  • correction unit 3 other image data is used to perform this correction.
  • the color display order (color sequence) in the FSC system is R, G, B.
  • the G color video signal and the R color video signal in the previous field of the G color video signal are used to correct the G color video signal.
  • a B color video signal in the field may be used.
  • a color display method three-plate projection type liquid crystal display device using simultaneous additive color mixture as shown in FIG. 3 or a color display method using juxtaposed (parallel) additive color mixture is used.
  • the frame memory required in the direct view type liquid crystal display device is not necessarily required.
  • a color display type liquid crystal display device using simultaneous additive color mixing has three liquid crystal display elements that individually modulate R, G, and B colors, and superimposes the modulated image light of each color.
  • a liquid crystal display device for display This type of projection type liquid crystal display device such as a projector is common and is called a so-called three-plate type.
  • a liquid crystal display device using a color display method using juxtaposed (or juxtaposed) additive color mixing is a plurality of pixels that perform color display by arranging subpixels (subpixels) having R, G, and B color filters in close proximity.
  • a liquid crystal display device is a plurality of pixels that perform color display by arranging subpixels (subpixels) having R, G, and B color filters in close proximity.
  • the state of the liquid crystal director in one field is affected by the state of the liquid crystal director in the previous field, and the state of the liquid crystal director in the next field.
  • the B color field when viewed from the G color field, is both the previous field and the next field. Therefore, by correcting the G color video signal, the gradation reproducibility of the B color in the next field can be improved.
  • the gradation of the G color correction signal is set.
  • the gray level of the G color video signal is based on the gradation level of the B color video signal 80% (more specifically, the difference between the gray level of the G color video signal and the gray level of the B color video signal).
  • the level is set to 60%, which is excessively higher than the level 50%, the state of the liquid crystal director in the B color field can be brought closer to the desired state more quickly, and the B color gradation reproducibility can be improved.
  • the G color correction signal when setting the G color correction signal in the correction unit 3 in a situation where the gradation level of the G color video signal is 50% and the gradation level of the B color video signal is 20%, the G color correction signal If the gradation level is set to 40%, which is excessively higher than the gradation level 50% of the G color video signal, as viewed from the gradation level 20% of the B color video signal, the state of the liquid crystal director in the B color field Can be brought closer to the desired state more quickly, and the B color gradation reproducibility can be improved.
  • the conventional overdrive is a technique of applying an excessive voltage by correcting the image data of the own field (own frame in the three-plate type) using the image data of the previous field (front frame in the three-plate type),
  • the gradation level of the image data in the video signal of the own field to be improved is 100% or 0%, the gradation reproducibility cannot be improved.
  • the gradation level of the image data in the video signal of the color of the next field to be improved is 100. Even if it is% or 0%, tone reproducibility and color reproducibility can be improved.
  • the correction unit 3 uses the order of supplying corrected image data in the liquid crystal display element 2.
  • the correction unit 3 may output corrected image data obtained by correcting each image data so that the time until the light transmittance is reached. That is, the correction unit 3 may correct each image data based on the supply timing (supply order) of the image data to each pixel 2a.
  • the correction unit 3 outputs, for each video signal, a correction signal having a plurality of corrected image data obtained by correcting each image data in the video signal based on the supply order and other image data. Improves gradation and color reproducibility degradation caused by the FSC method, and reduces differences in gradation and color reproducibility depending on the position in the screen.
  • FIG. 6 is a block diagram illustrating an example of the correction unit 3.
  • the correction unit 3 includes an R color correction unit 3R1, a G color correction unit 3G1, and a B color correction unit 3B1.
  • the R color correction unit 3R1 corresponds to the R color video signal on a one-to-one basis.
  • the R color correction unit 3R1 corresponds to the R color video signal, the G color video signal corresponding to the color of the next field of the R color, and the timing signal (the input frame synchronization timing signal indicating the input frame synchronization timing and the timing signal).
  • the horizontal synchronization timing signal indicating the horizontal synchronization timing and the pixel clock timing signal indicating the pixel clock timing corresponding to the horizontal synchronization timing signal) are input, and the R color correction signal is output.
  • the G color correction unit 3G1 has a one-to-one correspondence with the G color video signal.
  • the G color correction unit 3G1 includes a G color video signal, a B color video signal corresponding to the color of the next field of G color, and a timing signal (input frame synchronization timing signal, horizontal synchronization timing signal, and pixel clock timing signal). To output a G color correction signal.
  • the B color correction unit 3B1 corresponds to the B color video signal on a one-to-one basis.
  • the B color correction unit 3B1 includes a B color video signal, an R color video signal corresponding to the color of the next field of B color, and a timing signal (input frame synchronization timing signal, horizontal synchronization timing signal, and pixel clock timing signal). To output the B color correction signal.
  • the G color correction unit 3G1 includes three LUT (Look-up Table) storage units 3G1a, 3G1b and 3G1c, and a selection circuit (SEL) 3G1d.
  • LUT Look-up Table
  • SEL selection circuit
  • Each of the LUT storage units 3G1a, 3G1b, and 3G1c can be referred to as color correction means or storage means.
  • the correction unit 3 includes a plurality of color correction means or storage means.
  • the three LUT storage units 3G1a, 3G1b, and 3G1c all receive the G color video signal and the B color video signal and output the G color correction data.
  • Each of the LUT storage units 3G1a, 3G1b, and 3G1c is associated with a predetermined order (hereinafter referred to as “corresponding order”) in the order of supply.
  • the correspondence order associated with each of the plurality of LUT storage units 3G1a, 3G1b, and 3G1c is different for each LUT storage unit.
  • the LUT storage unit 3G1a is associated with the first order in the order of supply.
  • the LUT storage unit 3G1c is associated with the last order in the supply order.
  • the LUT storage unit 3G1b is associated with a predetermined order between the first order in the order of supply and the last order in the order of supply.
  • the LUT storage units 3G1a, 3G1b, and 3G1c receive image data and other image data, they output correction data obtained by correcting the image data based on the other image data and the corresponding order.
  • each of the LUT storage units 3G1a, 3G1b, and 3G1c associates image data and other image data with correction data obtained by correcting the image data based on the other image data and the corresponding order.
  • correction data associated with the image data and other image data is output.
  • the correction data output from each of the LUT storage units 3G1a, 3G1b, and 3G1c It is generally different from the correction data output from the storage unit.
  • the LUT storage unit 3G1a When the difference between the common image data and the correction data output from each of the LUT storage units 3G1a, 3G1b, and 3G1c based on the common image data is used as the correction amount, in this embodiment, the LUT storage unit The correction amount in 3G1a is generally smaller than the correction amounts in LUT storage units 3G1b and 3G1c. In the present embodiment, the correction amount in the LUT storage unit 3G1b is generally smaller than the correction amount in the LUT storage unit 3G1c.
  • the selection circuit 3G1d can be generally called output means.
  • the selection circuit 3G1d receives the input frame synchronization timing signal, the horizontal synchronization timing signal, and the pixel clock timing signal, and specifies the supply order based on these timing signals.
  • the selection circuit 3G1d creates and outputs a correction signal having a plurality of correction image data based on a plurality of correction data from each of the LUT storage units 3G1a, 3G1b, and 3G1c based on the order of supply.
  • the selection circuit 3G1d receives one correction data from the three correction data received based on the order of supply each time the correction data is received from the three LUT storage units 3G1a, 3G1b, and 3G1c. Data is selected and output as corrected image data.
  • “LUT storage unit 3R1a” is read
  • “LUT storage unit 3G1b” is read “LUT storage unit 3R1b”
  • “LUT storage unit 3G1c” is read “LUT storage unit 3R1c”
  • “selection circuit 3G1d” is “selection circuit” 3R1d ",” G color video signal “is read as” R color video signal ",” B color video signal “is read as” G color video signal ", and” G color correction signal “is read as” R color correction signal ". It can be done by replacing with.
  • “G color correction unit 3G1” is replaced with “B color correction unit 3B1” and “LUT storage unit 3G1a” is replaced.
  • “LUT storage unit 3B1a” is read
  • “LUT storage unit 3G1b” is read “LUT storage unit 3B1b”
  • “LUT storage unit 3G1c” is read “LUT storage unit 3B1c”
  • “selection circuit 3G1d” is “selection circuit” 3B1d
  • “G color video signal” is read as “B color video signal”
  • “B color video signal” is read as “R color video signal”
  • “G color correction signal” is read as “B color correction signal”. It can be done by replacing with.
  • the characteristics corrected by each LUT storage unit can be different for each color of the video signal.
  • FIG. 7 is an explanatory diagram for explaining the relationship between the position in the screen of the liquid crystal display element 2 and the correction operation.
  • the screen 2g is formed by a plurality of pixels 2a arranged in a matrix within the liquid crystal display element 2 (see FIG. 5).
  • a plurality of pixels 2a are scanned one row at a time in the direction from the uppermost row to the lowermost row of the screen 2g, and the selected pixel 2a corresponds to the pixel 2a. It is assumed that corrected image data to be supplied is supplied in order.
  • the order in which the corrected image data is supplied is the order from the upper line to the lower line on the screen 2g.
  • the screen 2g is divided into three areas 2g1, 2g2, and 2g3 according to the order in which the corrected image data is supplied.
  • the LUT storage units 3G1a, 3G1b, and 3G1c receive image data and other image data, they output correction data obtained by correcting the image data based on the other image data and the corresponding order.
  • the correction circuit 3G1d selects one correction data from the three correction data received as correction image data. Select as output.
  • the selection circuit 3G1d when the selection circuit 3G1d receives correction data having the order supplied to the pixels 2a in the area 2g1 from each of the three LUT storage units 3G1a, 3G1b, and 3G1c, the selection circuit 3G1d receives the correction data from the LUT storage unit 3G1a. The correction data is selected, and the selected correction data is supplied to the image memory control unit 4b as G color correction image data.
  • the selection circuit 3G1d selects correction data from the LUT storage unit 3G1b when receiving correction data having the order to be supplied to the pixels 2a in the area 2g2 from each of the three LUT storage units 3G1a, 3G1b, and 3G1c.
  • the selected correction data is supplied to the memory control unit 4b as G color correction image data.
  • the selection circuit 3G1d selects correction data from the LUT storage unit 3G1c when receiving correction data having the order to be supplied to the pixels 2a in the area 2g3 from each of the three LUT storage units 3G1a, 3G1b, and 3G1c.
  • the selected correction data is supplied to the memory control unit 4b as G color correction image data.
  • G color correction unit 3G1 is replaced with “R color correction unit 3R1”
  • LUT storage unit 3G1a is replaced with “LUT “LUT storage unit 3G1b” is replaced with “LUT storage unit 3R1b”
  • LUT storage unit 3G1c is replaced with “LUT storage unit 3R1c”
  • selection circuit 3G1d is replaced with “selection circuit 3R1d”. This can be done by replacing “G color corrected image data” with “R color corrected image data”.
  • G color correction unit 3G1 is replaced with “B color correction unit 3B1”
  • LUT storage unit 3G1a is replaced with “LUT “LUT storage unit 3G1b” is replaced with “LUT storage unit 3B1b”
  • LUT storage unit 3G1c is replaced with “LUT storage unit 3B1c”
  • selection circuit 3G1d is replaced with “selection circuit 3B1d”. This can be done by replacing “G color corrected image data” with “B color corrected image data”.
  • the memory control unit 4b When the memory control unit 4b receives the R color correction signal, the G color correction signal, and the B color correction signal, the memory control unit 4b converts the R color correction signal, the G color correction signal, and the B color correction signal into the R color on the frame memory 4a.
  • the correction signal, the G color correction signal, and the B color correction signal are rearranged in this order.
  • the timing control unit 5b receives a timing signal indicating the input frame synchronization timing, generates a timing signal indicating the output field synchronization timing obtained by dividing one frame period into three color field periods, and the data rearrangement unit 4 To the liquid crystal display element 2 and the illumination unit 5a.
  • the timing controller 5b also generates a horizontal synchronization signal corresponding to the output field synchronization timing and a transfer clock signal indicating the supply timing of the corrected image data, along with the vertical synchronization signal synchronized with the output field synchronization timing, and these signals. Is output to the liquid crystal display element 2.
  • the memory control unit 4 b uses the two timing signals (a timing signal indicating the input frame synchronization timing and a timing signal indicating the output field synchronization timing) from the timing control unit 5 b to change the input frame synchronization timing.
  • the writing to the frame memory 4a is controlled in synchronization, and the reading from the frame memory 4a is controlled in synchronization with the output field synchronization timing.
  • the memory control unit 4b applies the R color correction signal, the G color correction signal, and the B color correction signal on the frame memory 4a to the liquid crystal display element 2 as drive signals one by one in the arrangement order. Output.
  • the liquid crystal display element 2 receives the R color correction signal, the G color correction signal, and the B color correction signal sequentially output from the data rearrangement unit 4 in synchronization with the output field synchronization timing by the timing signal from the timing control unit 5b. To do.
  • the liquid crystal display element 2 sequentially synchronizes the corrected image data in the correction signal with the corrected image in synchronization with the vertical synchronizing signal, horizontal synchronizing signal, and transfer clock signal from the timing control unit 5b.
  • the direction of the liquid crystal of each pixel 2a (director) is controlled, and the direction of the liquid crystal is controlled by supplying the corrected image data for each color light sequentially irradiated for each color. Modulation is performed using the plurality of pixels 2a, and light that forms an image of each color is sequentially generated.
  • the illumination unit 5a lights up the R color LED, the G color LED, and the B color LED one by one in this order in synchronization with the output field synchronization timing by the timing signal from the timing control unit 5b.
  • the illumination unit 5a lights the R color LED, and the liquid crystal display element 2 is illuminated with the R color light.
  • the illumination unit 5a lights the G color LED and irradiates the liquid crystal display element 2 with the G color light.
  • the illumination unit 5a turns on the B color LED and irradiates the liquid crystal display element 2 with the B color light.
  • the correction unit 3 outputs, for each video signal, a correction signal having a plurality of corrected image data obtained by correcting each image data in the video signal based on the order of supply and other image data.
  • the selection circuit 3G1d creates and outputs a correction signal having a plurality of correction image data based on a plurality of correction data from each of the LUT storage units 3G1a, 3G1b and 3G1c based on the order of supply.
  • each of the LUT storage units 3G1a, 3G1b, and 3G1c stores image data, other image data, and correction data in association with each other, and receives image data and other image data.
  • a storage unit that outputs correction data is
  • a correction signal can be created and output by using an LUT.
  • the LUT storage unit 3G1a functions as a first color correction unit whose correspondence order is the first order of the supply order, and the LUT storage unit 3G1c has a correspondence order of the supply order. It functions as the second color correction means which is the last order.
  • the LUT storage unit 3G1b is a third color correction unit whose correspondence order is a predetermined order between the first order in the supply order and the last order in the supply order. Function.
  • the screen is divided into three areas for correction, the difference in gradation reproducibility and color reproducibility can be further reduced as compared with the case where the screen is divided into two areas.
  • each of the plurality of color correction units and the selection circuit are provided for each video signal.
  • the video signal can be corrected according to the position in the screen, so that the difference in gradation reproducibility and the difference in color reproducibility due to the position in the screen can be reduced.
  • the correction unit 31 shown in FIG. 8 is used as the correction unit 3 of the liquid crystal display device 1 shown in FIG.
  • correction unit 31 can be generally referred to as correction means.
  • the correction unit 31 includes an R color correction unit 3R2, a G color correction unit 3G2, and a B color correction unit 3B2.
  • the R color correction unit 3R2 corresponds to the R color video signal on a one-to-one basis.
  • the R color correction unit 3R2 includes an R color video signal, a G color video signal corresponding to the color of the next field of the R color, and a timing signal (input frame synchronization timing signal, horizontal synchronization timing signal, and pixel clock timing signal). To output an R color correction signal.
  • the G color correction unit 3G2 has a one-to-one correspondence with the G color video signal.
  • the G color correction unit 3G2 includes a G color video signal, a B color video signal corresponding to the color of the next field of G color, and a timing signal (input frame synchronization timing signal, horizontal synchronization timing signal, and pixel clock timing signal). To output a G color correction signal.
  • the B color correction unit 3B2 corresponds to the B color video signal on a one-to-one basis.
  • the B color correction unit 3B2 includes a B color video signal, an R color video signal corresponding to the color of the next field of B color, and a timing signal (input frame synchronization timing signal, horizontal synchronization timing signal, and pixel clock timing signal). To output a B color correction signal.
  • the G color correction unit 3G2 includes two LUT storage units 3G2a and 3G2b, and an interpolation calculation unit 3G2c.
  • Each of the LUT storage units 3G2a and 3G2b can be called color correction means or storage means.
  • the correction unit 31 includes a plurality of color correction means or storage means.
  • the two LUT storage units 3G2a and 3G2b both receive the G color video signal and the B color video signal and output the G color correction data.
  • the correspondence order is associated with each of the LUT storage units 3G2a and 3G2b in advance. Note that the correspondence order associated with each of the plurality of LUT storage units 3G2a and 3G2b is different for each LUT storage unit.
  • the LUT storage unit 3G2a is associated with the first order in the order of supply.
  • the LUT storage unit 3G2b is associated with the last order in the supply order.
  • the LUT storage units 3G2a and 3G2b receive image data and other image data, the LUT storage units 3G2a and 3G2b output correction data obtained by correcting the image data based on the other image data and the corresponding order.
  • each of the LUT storage units 3G2a and 3G2b stores image data and other image data in association with each other and correction data obtained by correcting the image data based on the other image data and the corresponding order.
  • correction data associated with the image data and other image data is output.
  • the correction data output from each of the LUT storage units 3G2a and 3G2b is output from the other LUT storage units. It is generally different from the correction data.
  • the LUT storage unit 3G2a Is generally smaller than the correction amount in the LUT storage unit 3G2b.
  • Interpolation calculation unit 3G2c can generally be called output means.
  • Interpolation calculation unit 3G2c receives an input frame synchronization timing signal, a horizontal synchronization timing signal, and a pixel clock timing signal, and specifies the order of supply based on these timing signals.
  • Interpolation calculation unit 3G2c creates and outputs a correction signal having a plurality of corrected image data based on the order of supply based on a plurality of correction data from each of LUT storage units 3G2a and 3G2b.
  • the interpolation calculation unit 3G2c is based on a plurality of correction data from each of the LUT storage units 3G2a and 3G2b. Then, a correction signal having a plurality of corrected image data is generated by interpolation and output.
  • the interpolation operation unit 3G2c includes a coefficient generation unit 3G2d, two multipliers 3G2e and 3G2f, and an adder 3G2g.
  • the interpolation calculation unit 3G2c inputs correction data output from each of the two LUT storage units 3G2a and 3G2b, multiplies each correction data by a predetermined coefficient according to the order of the correction data, and adds the multiplication results Then, the addition result is output as G color corrected image data.
  • the coefficient generation unit 3G2d generates a predetermined coefficient according to the order of the G color correction image data based on the input frame synchronization timing signal, the horizontal synchronization timing signal, and the pixel clock timing signal, Output to multipliers 3G2e and 3G2f.
  • the multiplier 3G2e multiplies the correction data from the LUT storage unit 3G2a by the coefficient from the coefficient generation unit 3G2d, and outputs the multiplication result to the adder 3G2g.
  • the multiplier 3G2f multiplies the correction data from the LUT storage unit 3G2b by the coefficient from the coefficient generation unit 3G2d, and outputs the multiplication result to the adder 3G2g.
  • the adder 3G2g adds the multiplication result of the multiplier 3G2e and the multiplication result of the multiplier 3G2f, and outputs the addition result as G color correction image data.
  • Multiplier 3G2e is read as “Multiplier 3R2e”
  • Multiplier 3G2f is read as “Multiplier 3R2f”
  • Multiplier 3G2g is read as “Adder 3R2g”
  • G color corrected image” Data to“ R color correction image ” It can be carried out by be read in the data.
  • Multiplier 3G2e is read as “multiplier 3B2e”
  • multiplier 3G2f is read as “multiplier 3B2f”
  • adder 3G2g is read as “adder 3B2g”
  • G color corrected image” Data to“ B Color Correction Image ” It can be carried out by be read in the data.
  • FIG. 9 is an explanatory diagram for explaining the relationship between the position in the screen and the correction operation.
  • the pixel 2a (the pixel 2a in the row to which the corrected image data is first supplied among the plurality of pixels 2a) exists in the uppermost row in the screen 2g.
  • the correction data output from each of the LUT storage units 3G2a, 3R2a and 3B2a is supplied as corrected image data.
  • the LUT is stored in the pixel 2a existing in the lowermost row in the screen 2g (the pixel 2a in the row to which the corrected image data is supplied last among the plurality of pixels 2a).
  • the correction data output from each of the units 3G2b, 3R2b, and 3B2b is supplied as corrected image data.
  • an interpolation calculation result obtained by interpolation according to the line is supplied to the line between the uppermost line and the lowermost line in the screen 2g.
  • the coefficient generation unit 3G2d sets the coefficient to be supplied to the multiplier 3G2e to “1” when the supply order is first, and to “0” when the supply order is last, and the supply order is slow. A coefficient that gradually decreases from “1” to “0” is used.
  • the coefficient generation unit 3G2d supplies “0” when the supply order is the first, and “1” when the supply order is the last, as the coefficient supplied to the multiplier 3G2f.
  • a coefficient that gradually increases from “0” to “1” is used.
  • the coefficient generation unit in the R color correction unit 3R2 and the coefficient generation unit in the B color correction unit 3B2 operate in the same manner as the coefficient generation unit 3G2d.
  • the interpolation calculation unit 3G2c when the supply order is different from the corresponding order, the interpolation calculation unit 3G2c generates a correction signal having a plurality of correction image data based on a plurality of correction data from the LUT storage units 3G2a and 3G2b. Created by interpolation and output.
  • the LUT is applied to the pixel at the position in the screen where the supply timing difference is the largest, the largest difference in gradation reproducibility and color reproducibility due to the position in the screen can be reduced. Furthermore, since the interpolation calculation is used together, even with a small number of LUT storage units, it is possible to accurately reduce the difference in tone reproducibility and color reproducibility depending on the position in the screen.
  • correction unit 3 a correction unit 32 shown in FIG. 10 may be used.
  • correction unit 32 shown in FIG. 10 The difference between the correction unit 32 shown in FIG. 10 and the correction unit 31 shown in FIG. 8 is that the video signals input to the color correction units of the respective colors have three colors.
  • the G color correction unit 3G4 shown in FIG. 11 is used instead of the G color correction unit 3G2 shown in FIG.
  • the G color correction unit 3G4 has a one-to-one correspondence with the G color video signal.
  • the G color correction unit 3G4 includes a G color video signal, a B color video signal corresponding to the color of the next field of G color, and a timing signal (input frame synchronization timing signal, horizontal synchronization timing signal, and pixel clock timing signal). To output a G color correction signal.
  • the G color correction unit 3G4 includes three LUT storage units 3G4a, 3G4b, and 3G4c, two selection circuits 3G4e and 3G4f, a selection circuit control unit (SEL control unit) 3G4g, and an interpolation calculation unit 3G2c.
  • the selection circuits 3G4e and 3G4f, the selection circuit control unit 3G4g, and the interpolation calculation unit 3G2c are included in the output unit 3G4h.
  • Each of the LUT storage units 3G4a, 3G4b and 3G4c can be referred to as color correction means or storage means.
  • the three LUT storage units 3G4a, 3G4b, and 3G4c all receive the G color video signal and the B color video signal and output the G color correction data.
  • Correspondence order is associated with each of the LUT storage units 3G4a, 3G4b, and 3G4c in advance.
  • the correspondence order associated with each of the plurality of LUT storage units 3G4a, 3G4b, and 3G4c is different for each LUT storage unit.
  • the LUT storage unit 3G4a is associated with the first order in the order of supply.
  • the LUT storage unit 3G4c is associated with the last order in the supply order.
  • the LUT storage unit 3G4b is associated with a predetermined order between the first order in the order of supply and the last order in the order of supply.
  • the LUT storage units 3G4a, 3G4b, and 3G4c receive image data and other image data, they output correction data obtained by correcting the image data based on the other image data and the corresponding order.
  • each of the LUT storage units 3G4a, 3G4b, and 3G4c associates image data and other image data with correction data obtained by correcting the image data based on the other image data and the corresponding order.
  • correction data associated with the image data and other image data is output.
  • the correction data output from each of the LUT storage units 3G4a, 3G4b and 3G4c It is generally different from the correction data output from the storage unit.
  • the LUT storage unit 3G4a When the difference between the common image data and the correction data output from each of the LUT storage units 3G4a, 3G4b, and 3G4c based on the common image data is used as the correction amount, in this embodiment, the LUT storage unit The correction amount in 3G4a is generally smaller than the correction amounts in LUT storage units 3G4b and 3G4c. In this embodiment, the correction amount in the LUT storage unit 3G4b is generally smaller than the correction amount in the LUT storage unit 3G4c.
  • the output unit 3G4h can be generally called output means.
  • the output unit 3G4h inputs the input frame synchronization timing signal, the horizontal synchronization timing signal, and the pixel clock timing signal, and specifies the supply order based on these timing signals.
  • the output unit 3G4h creates and outputs a correction signal having a plurality of corrected image data based on a plurality of correction data from each of the LUT storage units 3G4a, 3G4b, and 3G4c based on the order of supply.
  • the selection circuit 3G4e selects one of the correction data from each of the two LUT storage units 3G4a and 3G4b in accordance with the control from the selection circuit control unit 3G4g.
  • the selection circuit 3G4f selects one of the correction data from the two LUT storage units 3G4b and 3G4c in accordance with the control from the selection circuit control unit 3G4g.
  • Interpolation calculation unit 3G2c receives an input frame synchronization timing signal, a horizontal synchronization timing signal, and a pixel clock timing signal, and specifies the order of supply based on these timing signals.
  • Interpolation calculation unit 3G2c creates and outputs a correction signal having a plurality of correction image data based on a plurality of correction data from each of two selection circuits 3G4e and 3G4f based on the order of supply.
  • the interpolation computation unit 3G2c is based on a plurality of correction data from each of the selection circuits 3G4e and 3G4f.
  • a correction signal having a plurality of corrected image data is generated and output by interpolation calculation.
  • the selection circuit control unit 3G4g specifies the order of correction data based on the input frame synchronization timing signal, the horizontal synchronization timing signal, and the pixel clock timing signal, and based on the order, the two selection circuits 3G4e and 3G4f is controlled.
  • FIG. 12 is an explanatory diagram for explaining the relationship between the position in the screen and the correction operation.
  • the output unit so that the correction data output from the LUT storage unit 3G4a is supplied to the pixel 2a existing in the uppermost row in the screen 2g as corrected image data.
  • 3G4h (specifically, the selection circuit control unit 3G4g, the selection circuits 3G4e and 3G4f, and the interpolation calculation unit 3G2c) operate.
  • the LUT storage unit 3G4b outputs to the pixels 2a existing in a predetermined row (hereinafter referred to as “predetermined row”) between the uppermost row and the lower area in the screen 2g.
  • predetermined row a predetermined row between the uppermost row and the lower area in the screen 2g.
  • the output unit 3G4h operates so that the corrected data is supplied as corrected image data.
  • the output unit 3G4h so that the correction data output from the LUT storage unit 3G4c is supplied as corrected image data to the pixels 2a existing in the row belonging to the lower area in the screen 2g. Works.
  • the output unit 3G4h operates so that data is supplied. This interpolation calculation is in accordance with the interpolation calculation in FIG.
  • the output unit 3G4h operates so as to be supplied. This interpolation calculation is in accordance with the interpolation calculation in FIG.
  • the correction unit 33 shown in FIG. 13 is used as the correction unit 3 of the liquid crystal display device 1 shown in FIG.
  • correction unit 33 can be generally referred to as correction means.
  • the correction unit 33 includes two time division multiplexing circuits (MUX) 33a and 33b, a multicolor correction unit 33c, and a demultiplexer 33d.
  • the multicolor correcting unit 33c has the same configuration as the G color correcting unit 3G4 shown in FIG.
  • Time division multiplexing circuits (MUX) 33a and 33b are included in the switching unit 33e.
  • the switching unit 33e can be generally referred to as switching means.
  • the switching unit 33e When the switching unit 33e receives a plurality of video signals, the switching unit 33e outputs the image data and other image data to the plurality of LUT storage units 3G4a, 3G4b, and 3G4c in a time division manner while switching the video data for each video signal.
  • Each of the two time division multiplexing circuits 33a and 33b receives an input frame synchronization timing signal, a horizontal synchronization timing signal, and a pixel clock timing signal, and based on these timing signals, an R color video signal (image Data), G color video signal (image data), and B color video signal (image data) are alternatively selected and output.
  • the selection switching rate at this time is three times the pixel clock timing signal, that is, the R color video signal, the G color video signal, and the B color video signal are time-division multiplexed at a speed three times the clock speed of those signals. .
  • the multicolor correction unit 33 has the same configuration as that of the G color correction unit 3G4 shown in FIG. 11, but operates at a rate three times that of the G color correction unit 3G4, and the R color correction signal (corrected image data), G A color correction signal (corrected image data) and a B color correction signal (corrected image data) are output in a time-sharing manner.
  • the demultiplexer 33d separates the time-division multiplexed color correction signals output from the multicolor correction unit 33c and outputs the R color correction signal, the G color correction signal, and the B color correction signal in parallel. .
  • FIG. 14 is an explanatory diagram for explaining the relationship between the position in the screen and the correction operation.
  • the color correction unit so that the correction data output from the LUT storage unit 3G4a is supplied to the pixel 2a existing in the upper area in the screen 2g as the corrected image data. 33 operates.
  • the color correction unit 33 operates so that the correction data output from the LUT storage unit 3G4b is supplied to the pixels 2a existing in a predetermined row in the screen 2g as corrected image data. .
  • the color correction unit 33 operates so that the correction data output from the LUT storage unit 3G4c is supplied as the corrected image data to the pixel 2a existing in the lower area in the screen 2g. To do.
  • the upper area, the predetermined row, and the lower area are changed according to the video signal of each color.
  • the switching unit 33e when the switching unit 33e receives a plurality of video signals, the switching unit 33e switches between image data and other image data for each video signal, and in a time division manner, the plurality of LUT storage units 3G4a, 3G4b, and Output to 3G4c.
  • the pixel to which the correction data from the LUT storage unit is applied is changed according to the color of the video signal while using the common LUT storage unit. Can be changed. Therefore, the difference in gradation reproducibility and color reproducibility depending on the position in the screen can be reduced with a small circuit scale.
  • the number of LUTs may be changed depending on the color of the video signal. Since the light transmittance characteristic of the liquid crystal display element 2 varies depending on the wavelength of the light, a desired configuration can be obtained in consideration of the circuit scale and the correction accuracy.
  • the interpolation calculation may be linear interpolation or non-linear interpolation.
  • linear interpolation the configuration of the interpolation calculation unit can be made smaller than when nonlinear interpolation is used.
  • nonlinear interpolation the video signal can be corrected with higher accuracy than when linear interpolation is used.
  • the above embodiments can be applied to the liquid crystal display element 2 having a normally white configuration or a normally black configuration.
  • the above embodiments can be applied even if the color field is not the three colors of R, G, and B in the FSC system.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

L'invention porte sur une technique pour appliquer un mode de sur-attaque à un dispositif d'affichage à cristaux liquides en couleur à trame séquentielle. L'invention porte sur un dispositif d'affichage à cristaux liquides (1), qui comprend : un moyen de correction (3) pour recevoir une pluralité de signaux vidéo et délivrer en sortie des signaux corrigés comprenant une pluralité d'ensembles de données d'image corrigées ; un moyen de commande de sortie (4) pour délivrer en sortie les signaux corrigés séquentiellement un à un ; un moyen de rayonnement (5) pour émettre une lumière colorée correspondant aux signaux vidéo originaux des signaux corrigés à chaque fois qu'une trame des signaux corrigés est délivrée en sortie du moyen de commande de sortie ; et un dispositif d'affichage à cristaux liquides (2) comprenant une pluralité de pixels auxquels est délivré l'ensemble de données d'image corrigées inclus dans le signal corrigé, et modulant et délivrant en sortie la lumière provenant du moyen de rayonnement (5). Le moyen de correction (3) corrige les données d'image incluses dans les signaux vidéo de façon à obtenir les ensembles de données d'image corrigées, en fonction de l'ordre de délivrance des ensembles de données d'image corrigées à l'intérieur de chaque trame et d'autres données d'image qui ont été la source d'autres ensembles de données d'image corrigées délivrées, immédiatement avant ou après l'ensemble de données d'image corrigées, à un pixel auquel est délivré l'ensemble de données d'image corrigées, et délivre en sortie les signaux corrigés comprenant les ensembles de données d'image corrigées.
PCT/JP2009/051206 2009-01-26 2009-01-26 Dispositif d'affichage à cristaux liquides, circuit d'attaque et procédé d'attaque WO2010084619A1 (fr)

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PCT/JP2009/051206 WO2010084619A1 (fr) 2009-01-26 2009-01-26 Dispositif d'affichage à cristaux liquides, circuit d'attaque et procédé d'attaque

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