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WO2012099040A1 - Dispositif et procédé d'affichage d'image - Google Patents

Dispositif et procédé d'affichage d'image Download PDF

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Publication number
WO2012099040A1
WO2012099040A1 PCT/JP2012/050685 JP2012050685W WO2012099040A1 WO 2012099040 A1 WO2012099040 A1 WO 2012099040A1 JP 2012050685 W JP2012050685 W JP 2012050685W WO 2012099040 A1 WO2012099040 A1 WO 2012099040A1
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Prior art keywords
color
component
pixel region
light source
pixel
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Ceased
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PCT/JP2012/050685
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English (en)
Japanese (ja)
Inventor
朋幸 石原
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Sharp Corp
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Sharp Corp
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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
    • 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
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • 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

Definitions

  • the present invention relates to an image display device and an image display method, and more particularly to a technique for suppressing the occurrence of color breakup in an image display device using a field sequential method.
  • liquid crystal display devices that perform color display include a color filter that transmits red (R), green (G), and blue (B) light for each sub-pixel obtained by dividing one pixel into three.
  • RGB red
  • G green
  • B blue
  • the color filter type liquid crystal display device since about 2/3 of the backlight light applied to the liquid crystal panel is absorbed by the color filter, the color filter type liquid crystal display device has a problem that the light use efficiency is low. Therefore, a field sequential type liquid crystal display device that performs color display without using a color filter has attracted attention.
  • the display period of one screen is divided into three subframes.
  • a sub-frame is also called a sub-field, in the following description, the word of a sub-frame is used uniformly.
  • a red screen is displayed based on the red component of the input signal.
  • a green screen is displayed based on the green component of the input signal.
  • a blue screen is displayed based on the blue component of the input signal.
  • FIG. 27 is a diagram showing the principle of occurrence of color breakup.
  • the vertical axis represents time
  • the horizontal axis represents the position on the screen.
  • the observer's line of sight follows the object and moves in the moving direction of the object.
  • the white object moves from left to right in the display screen
  • the observer's line of sight moves in the direction of the oblique arrow.
  • the position of the object in each sub-frame image is the same. For this reason, as shown in part B of FIG. 27, color breakup occurs in the image shown on the retina.
  • Japanese Patent No. 3766274 describes that color breakup is reduced as follows in a color display device such as a liquid crystal display device.
  • a color display device such as a liquid crystal display device.
  • one frame period is composed of at least four subframes.
  • red, green, and blue are displayed one by one.
  • display of non-primary colors that is, display in at least two colors (mixed color display) is performed according to the image to be displayed.
  • the color displayed in the fourth subframe is determined by performing predetermined statistical processing on the original image signal composed of RGB signals for one frame.
  • Japanese Laid-Open Patent Publication No. 9-90916 describes that one frame period is composed of sub-frames of three primary colors of red, green and blue and a sub-frame of intermediate colors of white or three primary colors.
  • Japanese Patent No. 3215913 describes that one frame period is divided into four subframes and white display is performed in the fourth subframe.
  • Japanese Patent No. 3952362 describes that one frame period is divided into four subframes, and the color of the light source to be lit in the fourth subframe is determined based on the average value of the luminance of each color.
  • Japanese Unexamined Patent Application Publication No. 2003-241165 describes that RGB driving and RGBW driving can be switched, and RGB driving is performed in a bright environment, and RGBW driving is performed in a dark environment to prevent color breakup. ing.
  • Japanese Patent No. 3766274 Specification Japanese Unexamined Patent Publication No. 9-90916 Japanese Patent No. 3215913 Japanese Patent No. 3952362 Japanese Unexamined Patent Publication No. 2003-241165
  • an object of the present invention is to provide an image display device using a field sequential method that can more effectively suppress the occurrence of color breakup.
  • a first aspect of the present invention is a display unit including a plurality of pixel formation units arranged in a matrix and a plurality of colors capable of controlling a lighting state / light-off state for each color for irradiating the display unit with light.
  • An image display device that performs color display by switching a color of a light source that is turned on every subframe period by dividing one frame period into a plurality of subframe periods.
  • a color that is an index of the likelihood of color breakup for each of the color mixture components which are components obtained by combining two or more color components, based on a target image that is an image to be displayed on the display unit in each frame period
  • a color cracking strength calculating section for determining the cracking strength
  • a light source control unit that controls the state of the light sources of the plurality of colors in each subframe period based on the color breakup intensity for each color mixture component;
  • One frame period includes a single-color lighting subframe period in which the light sources of the plurality of colors are turned on one by one and an extended subframe period in which the light sources of the plurality of colors can take an arbitrary state.
  • the color breakup intensity calculating unit includes one or more pixel forming units that are to be displayed including the target component when the target image is displayed on the display unit when an arbitrary color mixture component is the target component.
  • the first pixel region which is a region, and a region composed of one or more pixel forming portions that should be displayed so that the size of the largest single-color component is smaller than the size of the component of interest in the first pixel region
  • the light source control unit increases the maximum color mixing component for the maximum color mixing component that is the color mixing component with the largest color breaking strength, and the maximum color mixing component included in the light emitted from the light source unit during the extended subframe period.
  • the state of the light sources of the plurality of colors is controlled in the extended subframe period so that the size of the light source increases.
  • the color break strength calculating unit increases the color break strength for the target component as the distance between the first pixel region and the second pixel region is smaller.
  • the color break strength calculating unit increases the color break strength for the target component as the size of the maximum single color component in the second pixel region is small.
  • the color breakup strength calculation unit calculates the color breakup strength for the target component as the difference between the maximum monochrome component size in the second pixel region and the minimum monochrome component size in the second pixel region is smaller. It is characterized by increasing.
  • the color breakup strength calculation unit increases the color breakup strength for the component of interest as the distance between the first pixel region and the second pixel region is smaller, and increases the maximum in the second pixel region.
  • a sixth aspect of the present invention is the fifth aspect of the present invention.
  • the color breakup strength calculation unit calculates the color breakup strength for the component of interest by the following equation.
  • V G1 (M) ⁇ G2 (S) ⁇ F2 (A) ⁇ G3 (D)
  • M represents the size of the maximum monochrome component in the second pixel region
  • S represents the size of the maximum monochrome component in the second pixel region and the minimum monochrome component in the second pixel region.
  • A represents the area of the second pixel region
  • D represents the distance between the first pixel region and the second pixel region
  • F2 () represents an increase function.
  • G1 (), G2 (), and G3 () represent a decreasing function.
  • the color breakup strength calculation unit calculates the color breakup strength for the component of interest by the following equation.
  • V K * G1 (M) * G2 (S) * F2 (A) * G3 (D)
  • K represents a coefficient or function predetermined for the component of interest
  • M represents the size of the largest monochrome component in the second pixel region
  • S represents the largest monochrome color in the second pixel region.
  • A represents the area of the second pixel region
  • D represents the first pixel region and the second pixel.
  • F2 () represents an increase function
  • G1 (), G2 (), and G3 () represent a decrease function.
  • the color break strength calculating unit obtains the color break strength for each color mixture component by performing a weighting process predetermined for each color mix component.
  • One frame period includes N (N is an integer of 2 or more) extended subframe periods
  • the light source control unit may use the first to Nth components of interest as the first to Nth components of interest when the color mixture components having the first to Nth color separation strengths are first to Nth, respectively. Controlling the state of the light sources of the plurality of colors in the N extended subframe periods so that the maximum color mixture component included in the light emitted from the light source unit in any of the N extended subframe periods. It is characterized by.
  • the light source control unit includes the light sources of the plurality of colors in the extended subframe period when the color breakup intensity for all color mixture components that can be included in the light emitted from the light source unit is smaller than a predetermined size.
  • the state of the light sources of the plurality of colors in the extended subframe period is controlled so that all of the light sources are turned off.
  • the light source control unit includes the light sources of the plurality of colors in the extended subframe period when the color breakup intensity for all color mixture components that can be included in the light emitted from the light source unit is smaller than a predetermined size.
  • the light source of any one of the light sources is in a lighting state, and in the single color lighting subframe period for the color that is in the lighting state in the extended subframe period, the light source is originally set according to the light emission amount in the extended subframe period.
  • the state of the light sources of the plurality of colors in each subframe period is controlled so that the light sources are turned on with a small amount of light emission.
  • the light source control unit is configured such that, among all the color mixture components that can be included in the light emitted from the light source unit, the color mixture component having the highest color breaking strength is changed from the first color mixture component to the second color mixture according to the change in the target image.
  • the size of the first color mixture component gradually decreases in the extended subframe period in a plurality of consecutive frame periods.
  • the state of the light sources of the plurality of colors in the extended subframe period is controlled so that the size of the second color mixture component gradually increases.
  • a thirteenth aspect of the present invention is a display unit including a plurality of pixel formation units arranged in a matrix and a plurality of colors capable of controlling a lighting state / light-off state for each color for irradiating the display unit with light.
  • An image display apparatus that performs color display by switching a color of a light source that is in a lighting state by dividing a frame period into a plurality of subframe periods.
  • a method A color that is an index of the likelihood of color breakup for each of the color mixture components, which are components obtained by combining two or more color components, based on a target image that is an image to be displayed on the display unit in each frame period
  • Color crack strength calculation step for determining the crack strength
  • a light source control step for controlling a state of the light sources of the plurality of colors in each subframe period based on the color breakup intensity for each color mixture component
  • One frame period includes a single-color lighting subframe period in which the light sources of the plurality of colors are turned on one by one and an extended subframe period in which the light sources of the plurality of colors can take an arbitrary state.
  • the color break strength calculating step includes one or more pixel forming units to be displayed including the target component when the target image is displayed on the display unit.
  • the first pixel region which is a region, and a region composed of one or more pixel forming portions that should be displayed so that the size of the largest single-color component is smaller than the size of the component of interest in the first pixel region
  • the color breakup strength for the component of interest is increased as the area of the second pixel region is larger
  • the maximum color mixture component included in the light emitted from the light source unit during the extended subframe period as the color break strength of the maximum color mixture component that is the color mixture component having the largest color break strength is larger.
  • the state of the light sources of the plurality of colors is controlled in the extended subframe period so that the size of the light source increases.
  • one frame period is composed of a monochromatic lighting subframe period and an extended subframe period.
  • the state of the light source is controlled so that a large amount of the color mixture component (maximum color mixture component) having the largest color breakup intensity, which is an index of the likelihood of cracking, is included in the light emitted from the light source.
  • maximum color mixture component the color mixture component having the largest color breakup intensity, which is an index of the likelihood of cracking.
  • the color breakup strength for the maximum color mixture component increases, more maximum color mixture components are included in the light emitted from the light source in the extended subframe period.
  • the color breakup strength when a certain color mixture component is the target component is such that the first pixel region where the display including the target component is to be performed and the maximum single color component are smaller than the target component in the first pixel region.
  • the color breakup strength is required in consideration of two factors related to the ease of viewing of the color breakup. For this reason, the occurrence of color breakup is effectively suppressed when displaying an image in which color breakup appears strongly locally.
  • the occurrence of color breakup is effectively suppressed when displaying an image in which color breakup appears locally.
  • the occurrence of color breakup is effectively suppressed when displaying an image in which color breakup appears locally.
  • the color cracking strength is determined in consideration of four factors related to the ease of visual recognition of the color cracking. For this reason, the occurrence of color breakup is more effectively suppressed when an image is displayed in which color breakup appears locally.
  • the occurrence of color breakup is more effectively suppressed when displaying an image in which color breakup appears locally. Is done.
  • the occurrence of color breakup is more effectively suppressed when displaying an image in which color breakup appears locally. Is done. Further, the color breakup strength is obtained by performing a weighting process determined in advance for each color mixture component. By performing the weighting process in consideration of easy visibility of color breaks by humans, it is possible to further enhance the effect of suppressing the occurrence of color breaks.
  • the color breakup strength is obtained by performing a predetermined weighting process for each color mixture component.
  • the ninth aspect of the present invention it is possible to effectively suppress the occurrence of color breakup even when displaying an image that may cause color breakup for a plurality of color mixture components.
  • the tenth aspect of the present invention when displaying an image in which color breakup is difficult to visually recognize, all light sources are turned off during the extended subframe period. For this reason, the effect that power consumption is reduced is obtained. In addition, since a black display period is inserted in one frame period, occurrence of a phenomenon called “motion blur” or the like at the time of moving image display is suppressed. As described above, power consumption is reduced and display quality is improved.
  • the eleventh aspect of the present invention when displaying an image in which color breakup is difficult to be visually recognized, the light source is prevented from being unnecessarily turned on in the extended subframe period, and the power consumption is reduced.
  • the light source of any one color is relatively By driving a plurality of times with a small current, power consumption can be effectively reduced. Further, since not all light sources are turned off during the extended subframe period, occurrence of flicker is also suppressed.
  • the color mixture component in which color breakage is strongly visually recognized changes according to the change in the target image
  • the color mixture component included in the light emitted from the light source unit during the extended subframe period is It gradually changes over multiple frame periods. For this reason, the occurrence of flickering on the screen when the target image changes is suppressed.
  • the same effect as that of the first aspect of the present invention can be achieved in the image display method.
  • FIG. 1 is a block diagram illustrating an overall configuration of a liquid crystal display device according to a first embodiment of the present invention. It is a figure which shows the structure of the frame period in the said 1st Embodiment.
  • FIG. 6 is a diagram for explaining color mixture components in the first embodiment.
  • the said 1st Embodiment it is a schematic diagram for demonstrating the display color in each sub-frame.
  • the said 1st Embodiment it is a figure for demonstrating how to obtain the display color in an expansion sub-frame.
  • it is a figure for demonstrating how to obtain the display color in an expansion sub-frame.
  • FIG. 5 is a flowchart illustrating a procedure of first pixel area acquisition processing in the first embodiment.
  • FIG. 6 is a diagram for describing blurring processing in the first embodiment.
  • FIG. 6 is a diagram for describing blurring processing in the first embodiment.
  • FIG. 6 is a diagram for describing blurring processing in the first embodiment.
  • FIG. 6 is a diagram for describing identification of a first reference pixel in the first embodiment.
  • it is a figure for demonstrating how to obtain
  • the said 1st Embodiment it is a figure for demonstrating how to obtain
  • region. 6 is a flowchart illustrating a procedure of second pixel area acquisition processing in the first embodiment.
  • it is a figure for demonstrating saturation.
  • it is a figure for demonstrating the magnitude
  • it is a figure for demonstrating the magnitude
  • FIG. 1 is a block diagram showing the overall configuration of the liquid crystal display device according to the first embodiment of the present invention.
  • the liquid crystal display device includes a display unit 100, a backlight unit 200, a panel drive circuit 300, and a subframe image generation unit 400.
  • the subframe image generation unit 400 includes a frame rate conversion unit 42, a video signal generation unit 44, and an image analysis unit 46.
  • the image analysis unit 46 includes a color breakup intensity calculation unit 462 and a light source control signal generation output unit (light source control unit) 464.
  • the backlight unit 200 controls LEDs of three colors of red (R), green (G), and blue (B) as a backlight (light source unit) and the states (lighted state / lighted state) of these LEDs. And an LED control circuit. Usually, a plurality of LEDs of each color are provided.
  • the display unit 100 is provided with a plurality of source bus lines (video signal lines) SL and a plurality of gate bus lines (scanning signal lines) GL.
  • a pixel formation portion for forming a pixel is provided corresponding to each intersection of the source bus line and the gate bus line. That is, the display unit 100 includes a plurality of pixel formation units. The plurality of pixel forming portions are arranged in a matrix to form a pixel array.
  • a TFT 10 which is a switching element having a gate terminal connected to a gate bus line GL passing through a corresponding intersection and a source terminal connected to a source bus line SL passing through the intersection, and the TFT 10
  • a liquid crystal capacitor formed by the pixel electrode 11 connected to the drain terminal, the common electrode 14 and the auxiliary capacitance electrode 15 commonly provided in the plurality of pixel formation portions, and the pixel electrode 11 and the common electrode 14. 12 and an auxiliary capacitor 13 formed by the pixel electrode 11 and the auxiliary capacitor electrode 15 are included.
  • the liquid crystal capacitor 12 and the auxiliary capacitor 13 constitute a pixel capacitor. Note that only the components corresponding to one pixel formation portion are shown in the display portion 100 of FIG.
  • one frame period includes a red monochromatic subframe, a green monochromatic subframe, It consists of four subframes, a blue monochrome subframe and an extended subframe.
  • red single-color subframe only the red LED is lit and a red display is performed.
  • green monochromatic subframe only the green LED is lit and green is displayed.
  • blue single-color subframe only the blue LED is turned on and blue display is performed.
  • each color LED can take an arbitrary state. Typically, in the extended subframe, any two color LEDs or all color LEDs are lit. When one of the two color LEDs is turned on, a mixed color display of the two colors is performed. When all color LEDs are turned on, white display is performed.
  • the frame rate conversion unit 42 converts the frame rate of the input image signal DIN given from the outside.
  • a 60 Hz input image signal DIN is supplied to the frame rate conversion unit 42, and 240 Hz data is output from the frame rate conversion unit 42 as target image data. Therefore, the frame rate (display frame rate) when an image is displayed on the display unit 100 is 240 Hz.
  • the same frame image may be used repeatedly, or a temporally interpolated image estimated by motion detection processing with emphasis on smoothness with respect to motion may be used. You may make it use, and you may make it use the image calculated
  • the specific method for converting the frame rate is not limited.
  • the frame rate of the input image signal DIN is not limited to 60 Hz, and may be 15 Hz, 24 Hz, 50 Hz, or the like, for example.
  • a display device for displaying a still image such as a digital photo frame (display device for digital photo display)
  • an image signal read from a previously held memory may be an input image signal. is there.
  • the frame rate conversion unit 42 is not required by setting the reading speed from the memory according to the display frame rate.
  • the color breakup intensity calculation unit 462 in the image analysis unit 46 Based on the target image data DAT output from the frame rate conversion unit 42, the color breakup intensity calculation unit 462 in the image analysis unit 46 generates color breakup for each of the color mixture components that can be included in the light emitted from the backlight.
  • the color cracking strength which is an index of ease, is obtained.
  • LEDs of three colors of red, green, and blue are employed as the light source, so that the mixed light of the white component, the yellow component, the magenta component, and the cyan component is included in the light emitted from the backlight. Ingredients may be included. Accordingly, the color break strength calculation unit 462 obtains the color break strength for each of the four color mixture components.
  • the white component is a mixed color component of a red component, a green component, and a blue component.
  • the yellow component is a mixed color component of a red component and a green component.
  • the magenta component is a mixed color component of a red component and a blue component.
  • the cyan component is a mixed color component of a green component and a blue component. A detailed description of how to determine the color breakup strength will be described later.
  • the light source control signal generation / output unit 464 in the image analysis unit 46 is based on the target image data DAT output from the frame rate conversion unit 42 and the color breakup strength for each color mixture component obtained by the color breakup strength calculation unit 462.
  • the light emission amounts of the three color LEDs in each subframe are obtained, and the light emission data DL indicating the light emission amounts and the backlight unit 200 so that each LED is in a state corresponding to the light emission amount (lighted state / lighted state).
  • a light source control signal S for controlling the operation is output.
  • the light source control signal S may be a signal for instructing the lighting state / extinguishing state of each LED (on / off in the time direction), or a signal for instructing the luminance of each LED. Or a combination thereof.
  • the video signal generation unit 44 Based on the target image data DAT output from the frame rate conversion unit 42 and the light emission data DL output from the light source control signal generation output unit 464, the video signal generation unit 44 performs the time aperture ratio of the liquid crystal in each pixel forming unit.
  • the digital video signal DV which is a signal for controlling the image, is generated and output.
  • the time aperture ratio corresponds to a temporal integration value of the transmittance of the liquid crystal.
  • the panel driving circuit 300 selectively drives the gate bus lines GL one by one and applies a driving video signal to each source bus line SL based on the digital video signal DV output from the video signal generation unit 44. . As a result, charges are accumulated in the pixel capacitance of each pixel formation portion based on the driving video signal.
  • the backlight unit 200 controls the state of each LED based on the light source control signal S output from the light source control signal generation output unit 464.
  • the display state of the screen is switched for each subframe, and an image based on the input image signal DIN is displayed on the display unit 100.
  • a display color (color of LED to be lit) in each subframe will be described.
  • the color mixture component will be described with reference to FIG.
  • the sizes of the single color components of red (R), green (G), and blue (B) are indicated by the length in the vertical direction.
  • one pixel in the target image has three components: a red component having a size indicated by an arrow 50R, a green component having a size indicated by an arrow 50G, and a blue component having a size indicated by an arrow 50B. Assume that it is composed of monochromatic components.
  • the pixel is composed of a white component having a size indicated by an arrow 51, a yellow component having a size indicated by an arrow 52, and a red component having a size indicated by an arrow 53”
  • the white component is a mixed color component of three colors including a red component, a green component, and a blue component
  • the yellow component is a mixed color component of two colors including a red component and a green component.
  • FIG. 4 is a schematic diagram for explaining display colors in each subframe.
  • red display is performed in the red single-color subframe
  • green display is performed in the green single-color subframe
  • blue display is performed in the blue single-color subframe.
  • two-color mixed display or three-color mixed display (white display) is performed based on the color breakup intensity for each color mixture component obtained by the color breakup intensity calculating unit 462. Is called.
  • FIG. 4 shows an example in which red and green mixed color display (yellow display) is performed.
  • first pixel region Z1 (hereinafter, referred to as “first pixel region”) having a certain color mixture component (referred to as “color mixture component M”) as the maximum color mixture component in the target image.
  • a region (hereinafter, referred to as “a”) having one or more pixels in which the size (component value) of the maximum monochromatic component is smaller than the size (component value) of the mixed color component M in the first pixel region Z1.
  • the display color in the extended subframe is determined to satisfy the following 1 to 5.
  • the size (component value) of the single color component or the mixed color component is preferably calculated as an integral value obtained from the lighting period of the backlight and the change curve of the transmittance of the liquid crystal.
  • a luminance value obtained by applying a signal gradation or gamma conversion thereto may be employed.
  • the distance between the first pixel area Z1 and the second pixel area Z2 may be the distance between the centers of gravity of both, or may be the distance between the parts where they are closest to each other.
  • the method for obtaining the first pixel region Z1 the method for obtaining the second pixel region Z2, the method for obtaining the color breakup strength, and the state of each color LED in the extended subframe will be described in detail.
  • the determination method shown below is an example and this invention is not limited to this.
  • the first pixel region Z1 is obtained for each color mixture component. That is, in the present embodiment, the first pixel region Z1 is obtained for each of the four color mixture components of the white component, the yellow component, the magenta component, and the cyan component.
  • FIG. 8 is a flowchart showing a procedure of processing for obtaining the first pixel region Z1 when an arbitrary color mixture component is set as the “component of interest” (hereinafter referred to as “first pixel region acquisition processing”).
  • first pixel region acquisition processing First, with respect to the entire target image, a component value distribution indicating the distribution of the size (component value) of the component of interest is acquired (step S10).
  • step S10 the following “blurring process” is performed on the component value distribution obtained in step S10 (step S12).
  • the average value of the component values of the target component for a plurality of pixels included in a certain rectangular or circular range centered on the target pixel is the target pixel in the target pixel.
  • the component value of the component For example, it is assumed that, for each color mixture component, the average value of the component values of 9 pixels including the pixel of interest and the surrounding 8 pixels is set to the component value of the pixel of interest by the blurring process. In this case, if the component value distribution as shown in FIG. 9 is acquired in step S10, the component value distribution as shown in FIG. 10 is obtained by the blurring process. For example, focusing on the pixel indicated by reference numeral 63, the component value before blurring processing is 50.
  • the reason for performing the blurring process is that, for each color mixture component, the average value of the component values of the pixels in a relatively large range is smaller than the size of the component values of the pixels in a small range. This is because the degree of contribution to the occurrence of is large.
  • the blurring processing method is not limited to the above method.
  • the average value of the component values of the target component (after weighting) for a plurality of pixels included in a certain rectangular or circular range centered on the target pixel may be the component value of the target component in the target pixel.
  • Pixel having component values a1 to a25 exist in the thick frame area indicated by reference numeral 64 as shown in FIG.
  • the component value Po after the blurring process for the target pixel may be obtained, for example, as follows.
  • A3 a1 + a2 + a3 + a4 + a5 + a6 + a10 + a11 + a15 + a16 + a20 + a21 + a22 + a23 + a24 + a25
  • Po (A1 ⁇ 5 + A2 ⁇ 1.5 + A3 ⁇ 0.5) / 25
  • weighting may be performed based on a Gaussian function distribution.
  • first reference pixel a process for specifying a pixel to be used as a reference in the first pixel region Z1 (hereinafter referred to as “first reference pixel”) is performed (step S14).
  • the pixel having the largest component value in the component value distribution after the blurring process is set as the first reference pixel.
  • the pixel denoted by reference numeral 61 is the first reference pixel.
  • the first reference pixel is obtained in consideration of the component values of pixels adjacent to those pixels. For example, in the example shown in FIG.
  • pixels having the maximum component value (200) in the upper left region 66 of the target image and the lower right region 68 of the target image (the pixel indicated by reference numeral 67 and the pixel indicated by reference numeral 69).
  • the pixel indicated by reference numeral 67 and the pixel indicated by reference numeral 69 Exists.
  • the average value of the component values of the eight pixels around the pixel indicated by reference numeral 67 is 185
  • the component value of the eight pixels around the pixel indicated by reference numeral 69 is obtained.
  • the average value of 176 is 176. Accordingly, the pixel indicated by reference numeral 67 in the upper left area 66 of the screen is the first reference pixel.
  • step S16 After the first reference pixel is specified in step S14, the component values of the first reference pixel and the surrounding pixels (adjacent pixels) are compared, and the difference from the component value of the first reference pixel or (first reference pixel) Pixels whose ratio (of the difference with respect to the component value of the pixel) falls within a predetermined range are extracted (step S16).
  • a region composed of the pixels extracted in step S16 is defined as a first pixel region Z1.
  • step S16 the number of pixels in the first pixel region Z1 (the area of the first pixel region Z1 is calculated based on this number of pixels) and the average value of the component values in the first pixel region Z1 are obtained. It is done.
  • the pixel denoted by reference numeral 71 is the first reference pixel.
  • a pixel in a thick frame region indicated by reference numeral 72 in FIG. 14 is extracted.
  • the thick frame area indicated by reference numeral 72 in FIG. 14 becomes the first pixel area Z1.
  • FIG. 15 is a flowchart showing a procedure of a process for obtaining the second pixel area (hereinafter referred to as “second pixel area acquisition process”).
  • second pixel area acquisition process a component value distribution in the entire target image is acquired based on the size (component value) of the maximum monochrome component in each pixel (step S20). Note that an average value of the sizes (component values) of the three monochrome components in each pixel may be obtained, and a component value distribution in the entire target image may be acquired based on the average value.
  • the blurring process is performed on the component value distribution obtained in step S20 as in step S12 in the first pixel area acquisition process (step S22).
  • a process for specifying a pixel to be used as a reference in the second pixel region Z2 (hereinafter referred to as “second reference pixel”) is performed (step S24).
  • the pixel having the smallest component value in the component value distribution after the blurring process is set as the second reference pixel.
  • the second reference pixel is obtained in consideration of the component values of pixels adjacent to those pixels. This may be obtained in the same manner as in the case where there are a plurality of pixels having the largest component value in step S14 of the first pixel region acquisition process.
  • step S24 After the second reference pixel is specified in step S24, the component values of the second reference pixel and the surrounding pixels (adjacent pixels) are compared, and the difference from the component value of the second reference pixel or (second reference A pixel whose ratio (difference with respect to the component value of the pixel) falls within a predetermined range is extracted (step S26).
  • An area composed of the pixels extracted in step S26 is set as a second pixel area Z2.
  • step S26 the number of pixels in the second pixel region Z2 (the area of the second pixel region Z2 is calculated based on the number of pixels), the average value of the component values in the second pixel region Z2, and An average value of saturation in the second pixel region Z2 is obtained.
  • the saturation is the difference between the maximum monochrome component size and the minimum monochrome component size (see FIG. 16) in each pixel.
  • the color breakup strength is obtained for each color mixture component. That is, in the present embodiment, the color breakup strength is obtained for each of the four color mixture components of the white component, the yellow component, the magenta component, and the cyan component.
  • V K * F1 (C) * G1 (M) * G2 (S) * F2 (A) * G3 (D)
  • C represents the average value of the component values of the component of interest in the first pixel region Z1
  • M represents the component value of the maximum monochrome component in the second pixel region Z2
  • S represents the second pixel region Z2.
  • A represents the area of the second pixel region Z2
  • D represents the distance between the first pixel region Z1 and the second pixel region Z2.
  • K represents a predetermined coefficient for the component of interest
  • F1 () and F2 () represent an increasing function
  • G1 (), G2 (), and G3 () represent a decreasing function.
  • a function having some value as a variable (argument) may be used.
  • K in the above equation (1) is determined for each color mixture component in consideration of the ease of visually recognizing color breakup.
  • color breakage is more visible in cyan than magenta, and color breakage is more visible in yellow than cyan.
  • color breaks are more visible in the mixed color of the three colors than in the mixed color of the two colors. Therefore, it is preferable that K is determined so that the color mixture strength in which color breakage is easily visually recognized becomes higher.
  • ⁇ 1.2.4 LED status of each color in the extended subframe> A description will be given of how the state of each color LED in the extended subframe is changed.
  • maximum color mixture component only the LEDs of the color constituting the color mixture component having the highest color breaking strength (hereinafter referred to as “maximum color mixture component”) are turned on. For example, if the maximum color mixture component is a yellow component, a red LED and a green LED are lit in the extended subframe, and if the maximum color mixture component is a white component, all color LEDs are displayed in the extended subframe. Lights up. Further, as shown in FIG. 17, the size of the maximum color mixture component included in the light emitted from the backlight in the extended subframe is increased as the color breakup strength for the maximum color mixture component increases, and the maximum color mixture component. The smaller the color cracking strength, the smaller.
  • the light emission amount in the extended subframe of the color LED that constitutes the maximum color mixture component may be set to the maximum light emission amount in the simplest case. Further, when the transmittance of the liquid crystal at the pixel with the largest size (component value) of the maximum color mixture component in the entire target image is maximized, the light emission amount in the extended subframe is set so that a desired luminance is obtained at the pixel. You may decide.
  • the color cracking strength is obtained by the above equation (1). Therefore, when a certain target image is used as a reference target image, an image including a larger maximum color mixture component is displayed in the first pixel region Z1 than the reference target image (the first image in FIG. 18). (See the case), the size of the maximum color mixture component (hereinafter referred to as “maximum component extended emission amount” for convenience) included in the light emitted from the backlight in the extended subframe is determined when the reference target image is displayed. (Refer to the reference target image display time in FIG. 18). On the other hand, when an image including the maximum color mixture component having a smaller size is displayed in the first pixel area Z1 compared to the reference target image (see the second case in FIG.
  • the maximum component expansion is performed.
  • the amount of light emission is made smaller than when the reference target image is displayed.
  • the maximum component extended light emission amount is set when the reference target image is displayed. Larger than.
  • the maximum component extended light emission amount is set when the reference target image is displayed. Is made smaller.
  • the maximum component extended light emission amount is set larger than when the reference target image is displayed. .
  • the maximum component extended light emission amount is made smaller than when the reference target image is displayed. . Further, when an image having a larger area of the second pixel region Z2 than the reference target image is displayed, the maximum component extended light emission amount is made larger than when the reference target image is displayed. On the other hand, when an image with a smaller area of the second pixel region Z2 is displayed compared to the reference target image, the maximum component extended light emission amount is made smaller than when the reference target image is displayed.
  • the maximum component extended light emission amount is It is made larger than when it is displayed.
  • the maximum component extended light emission amount is determined by the reference target image. It is made smaller than when it is displayed.
  • one frame period is composed of three subframes for monochromatic display and extended subframes capable of mixed color display, and the display colors in the extended subframes Is an index of the likelihood of color breakup and is determined based on the color breakup strength determined for each color mixture component.
  • the LED of the color constituting the color mixture component (maximum color mixture component) having the highest color breakup intensity is turned on.
  • the color splitting strength for the maximum color mixture component increases, more maximum color mixture components are included in the light emitted from the backlight in the extended subframe.
  • the color breakup strength is a relationship between a region (first pixel region) containing a large amount of color mixture components that cause color breakup in the target image and a region (second pixel region) containing little color mixture components. Is required in consideration of For this reason, the occurrence of color breakup is effectively suppressed when displaying an image in which color breakup appears strongly locally. Also, as can be seen from the above equation (1) (see K in the equation), when calculating the color breakup strength, a weighting process is performed in consideration of the ease with which the color breakup of each color mixture component is visually recognized by a person. Has been. Therefore, according to this embodiment, the occurrence of color breakup is more effectively suppressed. As described above, a liquid crystal display device using a field sequential method that can more effectively suppress the occurrence of color breakup is realized.
  • the color breakup strength may be obtained by an expression obtained by removing K from the above expression (1), that is, the following expression (2).
  • V F1 (C) ⁇ G1 (M) ⁇ G2 (S) ⁇ F2 (A) ⁇ G3 (D) (2) Note that in the above formula (2), only one of the five functions may be included, or a combination of two or more arbitrary functions from the above five functions may be used. .
  • the LEDs of colors other than the color constituting the maximum color mixture component are completely turned off in the extended subframe. Is not limited to this.
  • the display of the colors constituting the color mixture components other than the maximum color mixture component may be performed during a period of about 10% or less of the extended subframe. For example, as shown in FIG. 19, white display may be performed during a partial period of the extended subframe.
  • Second Embodiment> ⁇ 2.1 Configuration and operation> Since the configuration of the liquid crystal display device and the configuration of one frame period are the same as those of the first embodiment, description thereof will be omitted (see FIGS. 1 and 2). Further, since the method for obtaining the first pixel region, the method for obtaining the second pixel region, and the method for obtaining the color breakup strength are the same as those in the first embodiment, description thereof is omitted.
  • the light source control signal generation output unit 464 has a predetermined magnitude (hereinafter referred to as “comparison level”) for the color breakup intensity for all color mixture components that can be included in the light emitted from the backlight. ),
  • the light source control signal S is output in the extended subframe so that the LEDs of all colors are turned off as shown in FIG.
  • the LEDs of all colors are turned off in the extended subframe.
  • the present invention is not limited to this.
  • any one LED may be turned on.
  • the LED in the single color subframe for the color to be turned on in the extended subframe, the LED is turned on with a light emission amount smaller than the original light emission amount according to the light emission amount in the extended subframe. For example, when a green LED is turned on in the extended subframe, the green LED is turned on at the original half light emission amount in the green monochromatic subframe, and the green light is emitted in the extended subframe with the same light emission amount. It is only necessary that the LED is turned on (see FIG. 21).
  • the LED of any one color is originally However, it may be driven twice with a current of less than half the current. Thereby, power consumption is effectively reduced. Furthermore, the occurrence of flicker is suppressed compared to the second embodiment.
  • two extended subframes are provided in one frame period, but the number of extended subframes is not limited.
  • the backlight is composed of red (R), green (G), and blue (B) LEDs
  • four color mixture components white component, yellow component, magenta component, cyan component
  • N color mixture components can be included in the light emitted from the backlight, as shown in FIG. 25, one frame period is composed of a plurality of single-color subframes and N extended subframes. You can make it.
  • the color mixture component in which color breakup is strongly recognized varies depending on the target image. For this reason, the color mixture component in which color breakage is strongly recognized may change according to the change of the target image, at the timing when the display image is switched during the display of the still image or during the display of the moving image. In such a case, if the display color in the extended subframe is rapidly changed, flicker may be visually recognized on the screen. Therefore, in the present embodiment, the light source control signal generation / output unit 464 has a light source so that the display color in the extended subframe is gradually changed when the color mixture component in which the color break is strongly recognized in the target image changes. A control signal S is output. Note that the configuration of the liquid crystal display device and the configuration of one frame period are the same as those in the first embodiment, and a description thereof will be omitted (see FIGS. 1 and 2).
  • the display color in the extended subframe is changed over a period of 5 frames. Specifically, first, the size of the yellow component in the extended subframe is gradually reduced (period from t0 to t2). Thereafter, the size of the cyan component in the extended subframe is gradually increased (period from t3 to t5). Note that the blue LED is lit for a short period from t0 to t2, and the red LED is lit for a short period from t3 to t5, but they may be completely extinguished.
  • the size (component values) of the red, green, and blue components at t0 Ti i is an integer from 0 to M
  • R0, G0, and B0 are red, green, and blue components at tM (component values) are R1, G1, and B1, respectively.
  • the sizes (component values) Ri, Gi, and Bi of the red component, green component, and blue component in are respectively determined as follows.
  • Ri R0 ⁇ f (M ⁇ i, M) + R1 ⁇ f (i, M)
  • Gi Large (Ri, Bi)
  • Bi B0 ⁇ f (M ⁇ i, M) + B1 ⁇ f (i, M)
  • Large (A, B) is a function for selecting the larger value of A and B.
  • the display color in the extended subframe gradually changes over a plurality of frame periods. For this reason, the occurrence of flickering on the screen when the target image changes is suppressed. This makes it possible to suppress the occurrence of color breakup while suppressing flickering on the screen.
  • the liquid crystal display device has been described as an example, but the present invention is not limited to this.
  • the present invention is also applied to a display device other than a liquid crystal display device as long as it has a light source unit composed of light sources of a plurality of colors and adopts a method of switching the color of a light source in a lighting state for each subframe period. Can do.

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Abstract

L'invention concerne un dispositif d'affichage d'image qui utilise le procédé séquentiel de trames et qui est capable de supprimer plus efficacement l'occurrence de distorsion de couleurs. Une période de trame est configurée à partir de sous-trames d'éclairage monochrome et d'une sous-trame étendue, dans laquelle une source d'éclairage multi-colore peut endosser des états arbitraires. Une unité de calcul d'intensité de distorsion de couleurs (462) calcule pour chaque composant de couleurs mélangées une intensité de distorsion de couleurs représentant une sensibilité à la distorsion de couleurs. Une unité de génération/production de signaux de commande de source d'éclairage (464) commande les sources d'éclairage de manière que plus est importante l'intensité de distorsion de couleurs du composant de couleurs mélangées à intensité de distorsion de couleurs la plus importante, plus est grande la quantité dudit composant comprise dans la lumière émise par une unité de source d'éclairage dans la sous-trame étendue. Lorsqu'un composant de couleurs mélangées arbitraire est établi en tant que composant cible et s'il existe une première région de pixels à afficher qui contient le composant cible et s'il existe une seconde région de pixels à afficher dans laquelle le composant monochrome le plus grand est plus petit que le composant cible de la première région de pixels, alors plus la superficie de la seconde région de pixels est grande, plus l'intensité de distorsion de couleurs du composant cible est élevée.
PCT/JP2012/050685 2011-01-20 2012-01-16 Dispositif et procédé d'affichage d'image Ceased WO2012099040A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006301043A (ja) * 2005-04-18 2006-11-02 Agilent Technol Inc ディスプレイ装置
JP2007206698A (ja) * 2006-02-02 2007-08-16 Samsung Electronics Co Ltd フィールドシーケンシャル映像表示装置、及びその駆動方法
JP2008268324A (ja) * 2007-04-17 2008-11-06 Seiko Epson Corp 表示装置、表示装置の駆動方法および電子機器
JP2009092745A (ja) * 2007-10-04 2009-04-30 Ｎｅｃディスプレイソリューションズ株式会社 映像表示装置及びその光源駆動方法
JP2009103885A (ja) * 2007-10-23 2009-05-14 Seiko Epson Corp 表示装置の駆動方法及び回路、並びに電気光学装置及び電子機器
JP2009282098A (ja) * 2008-05-20 2009-12-03 Sony Corp 表示装置、表示装置の駆動方法および電子機器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006301043A (ja) * 2005-04-18 2006-11-02 Agilent Technol Inc ディスプレイ装置
JP2007206698A (ja) * 2006-02-02 2007-08-16 Samsung Electronics Co Ltd フィールドシーケンシャル映像表示装置、及びその駆動方法
JP2008268324A (ja) * 2007-04-17 2008-11-06 Seiko Epson Corp 表示装置、表示装置の駆動方法および電子機器
JP2009092745A (ja) * 2007-10-04 2009-04-30 Ｎｅｃディスプレイソリューションズ株式会社 映像表示装置及びその光源駆動方法
JP2009103885A (ja) * 2007-10-23 2009-05-14 Seiko Epson Corp 表示装置の駆動方法及び回路、並びに電気光学装置及び電子機器
JP2009282098A (ja) * 2008-05-20 2009-12-03 Sony Corp 表示装置、表示装置の駆動方法および電子機器

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