WO2013046984A1 - Dispositif d'affichage à cristaux liquides - Google Patents

Dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2013046984A1
WO2013046984A1 PCT/JP2012/070822 JP2012070822W WO2013046984A1 WO 2013046984 A1 WO2013046984 A1 WO 2013046984A1 JP 2012070822 W JP2012070822 W JP 2012070822W WO 2013046984 A1 WO2013046984 A1 WO 2013046984A1
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liquid crystal
gradation
image
display device
crystal display
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PCT/JP2012/070822
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English (en)
Japanese (ja)
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弘之 鍋澤
左川　学
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シャープ株式会社
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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
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • G09G3/003—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background to produce spatial visual effects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
    • H04N13/341—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using temporal multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/398—Synchronisation thereof; Control thereof
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
    • G02B30/24—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type involving temporal multiplexing, e.g. using sequentially activated left and right shutters
    • 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
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G02F1/13318—Circuits comprising a photodetector
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/58—Arrangements comprising a monitoring photodetector
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/30—Gray scale
    • 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
    • G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic 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
    • G09G2320/0271—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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/041—Temperature compensation
    • 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
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/356—Image reproducers having separate monoscopic and stereoscopic modes

Definitions

  • the present invention relates to a liquid crystal display device capable of visually recognizing a stereoscopic image.
  • a display device that allows an observer to perceive video displayed on a screen as a three-dimensional image.
  • a time-division display method in which an image for the right eye and an image for the left eye are alternately displayed on the entire screen in a short cycle is used.
  • the observer observes the right-eye image with the right eye and the left-eye image with the left eye while wearing active shutter glasses that alternately block the left-eye field and the right-eye field.
  • active shutter glasses that alternately block the left-eye field and the right-eye field.
  • crosstalk occurs due to characteristics of the display device and shutter glasses such as a lack of liquid crystal response speed when a liquid crystal panel is used for a screen and a lack of contrast of a liquid crystal shutter in shutter glasses. is there.
  • Crosstalk is a phenomenon in which part of the right-eye image leaks into the left eye and part of the left-eye image leaks into the right eye.
  • Patent Document 1 discloses a display device capable of suppressing the occurrence of crosstalk and a tailing phenomenon by appropriately executing overdrive processing (also referred to as overshoot processing) using different parameters (see FIG. 1). 27).
  • the first image based on the first image signal and the second image based on the second image signal are alternately displayed one frame at a time or two or more frames continuously, and a predetermined image is displayed.
  • Display unit 110 that sequentially switches in a cycle and displays line-sequentially in the image display area, and performs overdrive processing using a plurality of different parameters, and gradations of two or more consecutive first and second images
  • An overdrive processing unit 135 that selects a parameter to be applied to the overdrive processing for an image displayed in the subsequent frames according to the difference.
  • crosstalk can be reduced by executing the overdrive process when displaying a stereoscopic image.
  • JP 2011-090079 A Japanese Patent Publication “JP 2011-090079 A (published May 6, 2011)”
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal display device capable of appropriately reducing crosstalk generated when a stereoscopic image is observed.
  • the liquid crystal display device provides A liquid crystal display device including a liquid crystal panel capable of alternately displaying a left-eye image and a right-eye image for each display period of the left-eye image and the right-eye image by time division, A video processing circuit that generates an image signal for displaying an image on the liquid crystal panel based on an externally input video signal, and an external light detection unit that detects illuminance around the liquid crystal panel, The video processing circuit generates the image signal so that a gradation range that can be displayed on the liquid crystal panel decreases as the ambient illuminance acquired from the outside light detection unit decreases.
  • the image signal is generated so that the gradation range that can be displayed on the liquid crystal panel is reduced. That is, the input video signal is corrected so that the difference (applied voltage difference) between the lowest gradation (for example, black) and the highest gradation (for example, white) is small. Therefore, the movable range of the liquid crystal molecules becomes small. Thereby, since the response speed of the liquid crystal is increased, it is possible to reduce crosstalk that occurs when a stereoscopic image is observed.
  • an image signal is generated according to the ambient illuminance.
  • the video signal is corrected so that the difference between the lowest gradation and the highest gradation becomes smaller as the ambient illuminance becomes smaller (darker).
  • the response speed of the liquid crystal can be increased to reduce crosstalk, and display quality suitable for ambient illuminance can be obtained.
  • the liquid crystal display device provides A first display mode that is visible as a planar image, and a three-dimensional image by alternately displaying a left-eye image and a right-eye image for each display period of the left-eye image and the right-eye image by time division
  • a liquid crystal display device including a liquid crystal panel, including a second display mode visible as
  • a video processing circuit for generating an image signal for displaying an image on the liquid crystal panel based on an externally input video signal;
  • the video processing circuit is configured such that a gradation range that can be displayed on the liquid crystal panel in the second display mode is smaller than a gradation range that can be displayed on the liquid crystal panel in the first display mode.
  • the image signal is generated.
  • the gradation range (difference between the lowest gradation and the highest gradation) that can be displayed on the liquid crystal panel in 3D display (second display mode) is displayed on the liquid crystal panel in 2D display (first display mode). It becomes smaller than the possible gradation range. Thereby, in 3D display, the response speed of the liquid crystal is increased, so that crosstalk can be reduced.
  • the response speed can be increased by reducing the gradation range in 2D display, the afterimage can be reduced and the moving image performance can be improved.
  • the video signal processing circuit is configured to reduce the gradation range that can be displayed on the liquid crystal panel as the ambient illuminance acquired from the outside light detection unit decreases. It is the structure which produces
  • the video processing circuit can display the gradation range that can be displayed on the liquid crystal panel in the second display mode, and can be displayed on the liquid crystal panel in the first display mode.
  • the image signal is generated so as to be smaller than the gradation range. Thereby, crosstalk can be reduced appropriately.
  • FIG. 1 It is a block diagram which shows typically schematic structure of the liquid crystal display device which concerns on this Embodiment.
  • (A) is an image for the right eye and an image for the left eye observed through the active shutter glasses when the response speed of the liquid crystal is fast, and (b) is a composite image obtained by synthesizing the image of (a).
  • (A) is an image for the right eye and an image for the left eye observed through the active shutter glasses when the response speed of the liquid crystal is slow, and (b) is a composite image obtained by synthesizing the image of (a).
  • FIG. 5 is a graph showing the relationship between ambient illuminance and correction parameters in the liquid crystal display device according to Example 1.
  • FIG. 4 is a graph showing a relationship between a time required for an input gradation to change from 0 gradation to 255 gradation and a movable range of liquid crystal molecules in the liquid crystal display device according to Example 1; 5 is a graph showing a relationship between a correction parameter P and crosstalk in the liquid crystal display device according to Example 1.
  • 6 is a graph showing the relationship between ambient illuminance and correction parameters in a liquid crystal display device according to Example 2.
  • 6 is a graph showing the relationship between ambient illuminance and correction parameters in a liquid crystal display device according to Example 3.
  • FIG. 10 is a block diagram schematically showing a schematic configuration of a liquid crystal display device according to Example 4.
  • Example 4 In the liquid crystal display device which concerns on Example 4, it is a graph which shows the change of the backlight brightness
  • 6 is a graph showing a relationship between a lighting duty ratio and crosstalk in a liquid crystal display device according to Example 4;
  • 10 is a graph showing a relationship between a correction parameter and crosstalk in a liquid crystal display device according to Example 4;
  • FIG. 10 is a block diagram schematically showing a schematic configuration of a liquid crystal display device according to Example 5.
  • 5 is a graph showing an example of a relationship between an input gradation and a correction gradation in the liquid crystal display device according to the present embodiment.
  • 6 is a graph showing another example of the relationship between the input gradation and the correction gradation in the liquid crystal display device according to the present embodiment.
  • 6 is a graph showing another example of the relationship between the input gradation and the correction gradation in the liquid crystal display device according to the present embodiment.
  • 6 is a graph showing another example of the relationship between the input gradation and the correction gradation in the liquid crystal display device according to the present embodiment.
  • 6 is a graph showing another example of the relationship between the input gradation and the correction gradation in the liquid crystal display device according to the present embodiment.
  • 6 is a graph showing another example of the relationship between the input gradation and the correction gradation in the liquid crystal display device according to the present embodiment.
  • It is a block diagram which shows the structure of the other video processing circuit in the liquid crystal display device which concerns on this Embodiment.
  • 5 is a graph showing the relationship between the temperature of a liquid crystal panel and response time in the liquid crystal display device according to the present embodiment. 5 is a graph showing the relationship between the temperature of a liquid crystal panel and response time in the liquid crystal display device according to the present embodiment. It is a block diagram which shows typically schematic structure of the conventional liquid crystal display device. It is a graph which shows the relationship between an input gradation and a liquid crystal applied voltage in the conventional liquid crystal display device.
  • FIG. 1 is a block diagram schematically showing a schematic configuration of the liquid crystal display device according to the present embodiment.
  • the present liquid crystal display device displays a left-eye image and a right-eye image alternately in a time-sharing manner for each display period of the left-eye image and the right-eye image, and allows a viewer to perceive a stereoscopic image. have.
  • the liquid crystal display device 10 includes a video processing circuit 1, an external light detection unit 2, a 3D processing circuit 3, a panel control circuit 4, a backlight control circuit 5, a liquid crystal panel 6, a backlight 7, and a memory unit 8.
  • the video processing circuit 1 receives a video signal from an external tuner (not shown), and external light information (ambient illuminance) acquired from the external light detection unit 2 for the received video signal (also referred to as an input video signal). Perform correction based on. Specifically, the correction parameter corresponding to the ambient illuminance is acquired from the memory unit 8, and the corrected video signal (input gradation) is multiplied by the acquired correction parameter by multiplying the acquired correction parameter by the gradation corresponding to the input video signal (input gradation). Also referred to as a corrected video signal, and a gradation corresponding to the corrected video signal is referred to as a corrected gradation).
  • the video processing circuit 1 outputs the calculated corrected video signal to the 3D processing circuit 3 and also outputs a control signal for controlling the driving of the backlight 7 to the backlight control circuit 5. Details of the video processing circuit 1 will be described later.
  • the outside light detection unit 2 can apply a known technique such as a photosensor (OPC).
  • the 3D processing circuit 3 When the 3D processing circuit 3 causes the observer to perceive a stereoscopic image, based on the corrected video signal acquired from the video processing circuit 1, the right-eye image observed by the viewer's right eye and the left-eye observed by the left eye An ophthalmic image is generated. That is, when the input video signal input from the tuner has a stereoscopic image format, the right eye image and the left eye image are divided and generated from the corrected video signal. When the input video signal input from the tuner has a normal format, a right eye image and a left eye image are newly generated for each frame from the corrected video signal. Then, the 3D processing circuit 3 transmits the right-eye image and the left-eye image to the panel control circuit 4 as one frame image.
  • the frame image signals (corrected video signals) of the right-eye image and the left-eye image are alternately and sequentially transmitted to the panel control circuit 4.
  • a well-known technique can be applied to the method for generating the image for the right eye and the image for the left eye.
  • the 3D processing circuit 3 outputs a control signal (L / R signal) for controlling the opening / closing operation of the active shutter glasses to the active shutter glasses.
  • the active shutter glasses open and close so that the left eye field of view is blocked when the L signal is received, and the right eye field of view is blocked when the R signal is received.
  • the panel control circuit 4 causes the liquid crystal panel 6 to sequentially display an image for one frame corresponding to the frame image signal based on the frame image signal sequentially transmitted from the 3D processing circuit 3 at a constant cycle. Specifically, the panel control circuit 4 drives various drive circuits (gate driver, source driver, etc.) and applies gradations (correction levels) corresponding to the frame image signal to each pixel electrode provided in the liquid crystal panel 6. Supply the voltage according to the adjustment. Thereby, in each pixel of the liquid crystal panel 6, the light transmittance is determined for each pixel, and the light from the backlight 7 is transmitted, whereby an image is displayed on the front surface of the liquid crystal panel 6. Here, the right eye image and the left eye image are alternately displayed.
  • the backlight control circuit 5 adjusts the luminance of the light source (for example, LED) of the backlight 7.
  • the backlight control circuit 5 supplies a backlight lighting current to the LED according to the control signal acquired from the video processing circuit 1.
  • the backlight lighting current is a pulse current.
  • the LED repeats ON / OFF at a speed that cannot be recognized by human eyes according to the lighting duty ratio of the pulse current.
  • the backlight luminance is set to a constant value according to the input video signal (input gradation).
  • the backlight 7 is disposed on the back surface of the liquid crystal panel 6 for displaying an image, and as a light source, for example, a plurality of W (white) LEDs or a plurality of RGB (red, green, blue) three-color LEDs (hereinafter referred to as “LED”) It is simply a lighting device provided with LED).
  • the backlight 7 is a direct type, and LEDs are two-dimensionally arranged on the surface facing the liquid crystal panel 6. Further, as the backlight 7, it is possible to adopt an edge light type other than the direct type.
  • FIG. 2A is an image for the right eye and an image for the left eye observed through the active shutter glasses when the response speed of the liquid crystal is fast
  • FIG. 2B is an image of FIG. Is a combined image
  • FIG. 3A is an image for the right eye and an image for the left eye observed through the active shutter glasses when the response speed of the liquid crystal is slow
  • FIG. 3B is a diagram of FIG. It is a synthesized image obtained by synthesizing images. 2 and 3, for the sake of convenience, description will be made with an image in which white (gradation 255: light transmittance 100%) and black (gradation 0: light transmittance 0%) are combined.
  • the right-eye image P1R and the left-eye image P1L are alternately displayed on the front surface of the liquid crystal panel.
  • the right-eye image P1R and the left-eye image P1L are displayed in the image display area 20 of the liquid crystal panel.
  • the image display area 20 and the right-eye image P1R are displayed in an overlapping manner.
  • the image display area 20 and the left-eye image P1L are displayed in an overlapping manner.
  • the image display area 20 will be described as a left area 20L, a center area 20C, and a right area 20R from the left.
  • the right-eye image P1R is an image in which the left region 20L is white (gradation 255) and the central region 20C and the right region 20R are black (gradation 0).
  • the left-eye image P1L is an image in which the left region 20L and the central region 20C are white (gradation 255) and the right region 20R is black (gradation 0).
  • the liquid crystal panel always displays an image of white (gradation 255) in the left region 20L and always black (gradation 0) in the right region 20R. .
  • the center region 20C when the right-eye image P1R is displayed, it is a black (gradation 0) image, and when the left-eye image P1L is displayed, it is white (gradation 255).
  • the central region 20C displays a black (gradation 0) image for the right eye image P1R and a white (gradation 255) image for the left eye image P1L. That is, in the central region 20C, when the right eye image P1R and the left eye image P1L are switched, the light transmittance also changes.
  • white or black can be accurately displayed in the central region 20C as shown in FIG.
  • FIG. 2B is not represented as a stereoscopic image, but is actually recognized as a stereoscopic image.
  • FIG. 3A shows a right-eye image P2R and a left-eye image P2L.
  • the image display area 20 of the liquid crystal panel is displayed in an overlapping manner, and the frame image signal sent to the liquid crystal display device is the right-eye image P1R shown in FIG. This is the same as that for the image P1L.
  • the image displayed in the left region 20L of the image display region 20 is white (gradation 255) when the right eye image P2R and the left eye image P2L are displayed.
  • 20R both are black (gradation 0). Since the left region 20L and the right region 20R always display images of the same gradation, there is no influence or very small influence on the response speed of the liquid crystal panel.
  • the right eye image P2R is black and the left eye image P2L is white (the same as (a) of FIG. 2), and is affected by the response speed of the liquid crystal panel. That is, when the response speed of the liquid crystal panel is slow, the light transmittance of the liquid crystal panel cannot be changed sufficiently when the images are switched.
  • the images displayed in the right region 20R and the left region 20L, which are less affected by the response speed, are displayed as frame image signals, but in the central region 20C.
  • the change in the light transmittance of the liquid crystal panel is not in time until the backlight is turned on. That is, the central region 20C is white (light transmittance 100%) in the left-eye image P2L that is the previous image, but is black (light transmittance 0%) in the right-eye image P2R that is the current image.
  • the change (response) of the light transmittance of the liquid crystal panel is not in time, and instead of black, it becomes dark gray (white black Bw).
  • the image displayed in the central region 20C is not gray but light gray (blackish white Wb).
  • the change in the transmittance of the liquid crystal panel does not catch up with the lighting of the backlight, and the ratio of the front frame (image of the opposite eye) remaining in the image that should be seen and mixed is shown using the formula shown in FIG. calculate.
  • the method of calculating the crosstalk value is not limited to this, and other known methods can be used.
  • the liquid crystal display device 10 corrects a video signal input from the outside by the video processing circuit 1 to increase the response speed of the liquid crystal panel 6 and observe a stereoscopic image.
  • the crosstalk generated at the time is appropriately reduced.
  • FIG. 5 is a block diagram showing the configuration of the video processing circuit 1.
  • the video processing circuit 1 includes an image quality adjustment unit 11 that corrects an image contour of a video signal, a color adjustment unit 12 that corrects an RGB balance of the video signal, a gradation correction unit 13, a luminance adjustment unit 14, a gamma adjustment unit 15, and A video interpolation unit 16 is provided.
  • a well-known technique can be applied to the image quality adjustment unit 11, the hue adjustment unit 12, the gamma adjustment unit 15, and the video interpolation unit 16.
  • the gradation correction unit 13 acquires external light information (ambient illuminance) from the external light detection unit 2 and acquires correction parameters corresponding to the acquired ambient illuminance from the memory unit 8.
  • the memory unit 8 stores a correction table in which ambient illuminance and correction parameters are associated with each other.
  • the correction parameter is set to change linearly with respect to the change in ambient illuminance, as shown in the graph of FIG.
  • the correction parameter is set to a value smaller than 1, and increases in proportion to the size of the ambient illuminance.
  • the correction parameter is not limited to this, and other setting methods of the correction parameter will be described later.
  • the gradation correction unit 13 performs a process of multiplying the input video signal (video signal after image quality adjustment and hue adjustment) by the correction parameter acquired from the memory unit 8. Thereby, the gradation (correction gradation) of the corrected video signal becomes smaller than the gradation (input gradation) of the original video signal. That is, the gradation range (dynamic range) that can be displayed on the liquid crystal panel 6 is reduced. For example, when the display gradation is 0 to 255 gradation and the correction parameter P is set to 0.8, when the input gradation is 255 gradation, the correction gradation is 204 gradations, and the solid line graph in FIG. As shown, the gradation range that can be displayed on the liquid crystal panel 6 is 0 to 204 gradations. In FIG. 18, a dotted line graph indicates a case where gradation is not corrected.
  • the display gradation is 0 to 255 gradations.
  • the liquid crystal transmittance correlates with the movable range of the liquid crystal molecules. The smaller the liquid crystal transmittance (that is, the smaller the ambient illuminance S and the correction parameter P), the smaller the movable range of the liquid crystal molecules (see FIG. 8). ).
  • FIG. 9 is a graph showing the relationship between the time required for the input gradation to change from 0 gradation to 255 gradation and the movable range of the liquid crystal molecules.
  • FIG. 10 is a graph showing the relationship between the correction parameter P and crosstalk. As can be seen from this figure, the crosstalk decreases as the correction parameter P decreases.
  • the luminance of the backlight 7 is fixed to a predetermined value.
  • the gradation (input gradation) of the video signal is set so that the gradation range that can be displayed on the liquid crystal panel 6 is reduced, that is, the lowest gradation (black) and the highest gradation. Since the difference (applied voltage difference, dynamic range) from (white) is corrected, the movable range of the liquid crystal molecules is reduced. As a result, the response speed of the liquid crystal is increased, so that crosstalk can be reduced.
  • the display luminance is set higher (brighter) as the ambient illuminance is higher (brighter), and the display luminance is set lower (darker) as the ambient illuminance is lower (darker). It is desirable.
  • correction is performed so that the gradation range (difference between the lowest gradation and the highest gradation) becomes smaller as the ambient illuminance becomes smaller (darker). That is, as the ambient illuminance decreases (darkens), the display brightness decreases. Therefore, according to the present liquid crystal display device 10, the response speed of the liquid crystal can be increased to reduce crosstalk, and display quality suitable for external light (ambient illuminance) can be obtained.
  • the correction parameter in the video processing circuit 1 according to the first embodiment is set so as to change nonlinearly (multiple-order function change) with respect to the change in ambient illuminance.
  • FIG. 11 is a graph showing the relationship between ambient illuminance and correction parameters. Even if the correction parameters set in this way are used, the same effect as in the first embodiment can be obtained.
  • the function expression of the correction parameter is set corresponding to the ambient illuminance. For example, when the ambient illuminance is divided into three areas (illuminance: small, medium, large), the area of the ambient illuminance is “small” and “large”, and the change in the graph is moderate, and the area where the ambient illuminance is “medium” Then, the function equation of the correction parameter can be set so that the change of the graph becomes steep.
  • the correction parameter is set to change stepwise (threshold change) with respect to the change in ambient illuminance.
  • FIG. 12 is a graph showing the relationship between ambient illuminance and correction parameters.
  • FIG. 13 is a block diagram schematically illustrating a schematic configuration of the liquid crystal display device 10 according to the fourth embodiment.
  • the backlight control circuit 5 generates a backlight lighting current based on the control signal acquired from the video processing circuit 1 and the ambient illuminance acquired from the external light detection unit 2.
  • FIG. 14 is a graph showing changes in backlight luminance with respect to ambient illuminance. Note that the magnitude of the backlight luminance is determined by adjusting the lighting duty ratio (pulse width) of the pulse current. For example, if the pulse width is increased, the backlight luminance is increased (brighter), and if the pulse width is decreased, the backlight luminance is decreased (darker).
  • FIG. 16 is a graph showing the relationship between correction parameters and crosstalk. As shown in this figure, it can be seen that the crosstalk can be further reduced by reducing the lighting duty ratio. Note that the configuration for adjusting the backlight luminance according to the fourth embodiment can also be applied to the liquid crystal display devices according to the second and third embodiments.
  • FIG. 17 is a block diagram schematically illustrating a schematic configuration of the liquid crystal display device 10 according to the fifth embodiment.
  • external light information (ambient illuminance) acquired by the external light detection unit 2 in the liquid crystal display device 10 shown in FIG. 1 is input to the backlight control circuit 5. That is, in the liquid crystal display device 10 according to the fifth embodiment, external light information is not input to the video processing circuit 1.
  • the backlight control circuit 5 generates a backlight lighting current based on the control signal acquired from the video processing circuit 1 and the external light information acquired from the external light detection unit 2 as in the fourth embodiment.
  • the video processing circuit 1 performs a process of correcting the input video signal regardless of the ambient illuminance.
  • the video processing circuit 1 uses the correction parameters that are different between 2D display (first display mode) visible as a planar image and 3D display (second display mode) visible as a stereoscopic image.
  • a signal (correction gradation) is generated.
  • the 2D display correction parameter (first correction parameter) and the 3D display correction parameter (second correction parameter) are respectively stored in the memory unit 8.
  • the video processing circuit 1 acquires a correction parameter for 2D display from the memory unit 8 to calculate a correction gradation, and 3D from the outside.
  • the correction gradation for 3D display is acquired from the memory unit 8 and the correction gradation is calculated.
  • both the correction parameter for 2D display and the correction parameter for 3D display can be set to a value smaller than 1 (a different value or the same value). Therefore, it is possible to reduce the trailing afterimage at the time of 2D display and improve the moving image performance, and to reduce the crosstalk at the time of 3D display.
  • the liquid crystal display device 10 according to the fifth embodiment may include a configuration for adjusting the backlight luminance according to the fourth embodiment.
  • the values (formulas) shown in the first to fourth embodiments can be used as the correction parameters for 2D display and the correction parameters for 3D display.
  • the correction parameter in 3D display is set to a value smaller than 1, the correction gradation for the input gradation at a certain ambient illuminance is, for example, the graph of FIG. As shown in 1), it changes linearly with the high gradation side cut.
  • the liquid crystal display device 10 of the present invention is not limited to this.
  • another example of the correction of the frame image signal in the liquid crystal display device 10 according to the present invention will be described with reference to the drawings.
  • FIG. 19 shows the correction gradation for the input gradation at a certain ambient illuminance, with the low gradation side cut off.
  • the correction parameter in this case can be expressed as a function of the graph shown in FIG. That is, as a correction parameter, a correction function corresponding to the ambient illuminance is stored in the memory unit 8, and the video processing circuit 1 uses the correction function stored in the memory unit 8 and corresponding to the ambient illuminance to Keys can be calculated.
  • FIG. 20 shows the correction gradation for the input gradation at a certain ambient illuminance, in which both the high gradation side and the low gradation side are cut.
  • the correction gradation is corrected to 16 gradations when the input gradation is 0 gradation
  • the correction gradation is corrected to 239 gradations when the input gradation is 255 gradations.
  • the gradation changes linearly with the high gradation side and the low gradation side cut.
  • the correction parameter in this case can be expressed as a function of the graph shown in FIG.
  • the correction gradation has an offset with respect to the input gradation by multiplying the input gradation by the correction parameter. That is, the video processing circuit 1 generates an image signal (corrected gradation) so as to cut at least one of the high gradation side and the low gradation side of the input video signal.
  • the correction function relating to the correction gradation can be appropriately set according to the ambient illuminance and the use of the liquid crystal display device 10. For example, it can be set as a function shown in the graphs of FIGS. 21 and 22 show nonlinear functions.
  • FIG. 23 shows a linear (polygonal line type) function in which the gradient is switched at a certain value (here, 32 gradations) on the low gradation side. That is, when the input gradation is 0 gradation, it is corrected to 32 gradations, and when the input gradation is 32 gradations, it is corrected to 44 gradations.
  • the correction gradation changes linearly between 32 gradations and 44 gradations, and the input gradation exceeds 32 gradations
  • the correction gradation changes linearly between 44 gradations and 255 gradations.
  • the video processing circuit 1 can obtain a correction gradation corresponding to the input gradation with reference to the correction table corresponding to the ambient illuminance of the memory unit 8.
  • the correction parameter is set to a predetermined value (predetermined function) regardless of the ambient illuminance
  • the correction level corresponding to the input gradation is referred to with reference to the predetermined correction table in the memory unit 8. It can be set as the structure which acquires a key.
  • the video processing circuit 1 further includes a frame memory management unit 17, a frame memory 18, and an overshoot processing unit 19 (tone transition emphasis) as shown in FIG. And an overshoot process (gradation transition emphasis process) for setting the output gradation of the current frame based on the input gradation of the current frame and the gradation of the previous frame.
  • an overshoot process for setting the output gradation of the current frame based on the input gradation of the current frame and the gradation of the previous frame.
  • the image quality adjustment unit 11, the hue adjustment unit 12, the luminance adjustment unit 14, the gamma adjustment unit 15, and the video interpolation unit 16 are omitted.
  • the corrected video signal (hereinafter referred to as image data) output from the gradation correction unit 13 is first input to the frame memory management unit 17.
  • the frame memory management unit 17 stores the input image data of the current frame in the frame memory 18.
  • the frame memory management unit 17 reads the image data of the previous frame already stored in the frame memory 18 and outputs the image data to the overshoot processing unit 19 together with the input image data of the current frame.
  • the overshoot processing unit 19 refers to the overshoot table stored in the memory unit 8 based on the image data of the previous frame acquired from the frame memory management unit 17 and the image data of the current frame.
  • the image data (output gradation) of the overshoot period in the current frame corresponding to each pixel is determined (set).
  • the memory unit 8 stores a table corresponding to each pixel of RGB.
  • the response speed can be increased by displaying an image based on the output gradation set in this way. Further, in the liquid crystal display device 10 of the present invention, for example, as shown in FIG. 18, the maximum gradation (white) can be lowered, so that overshoot processing can be appropriately performed in all gradation ranges.
  • FIG. 25 shows the time required to change from 0 gradation (black) to 255 gradation (white) according to the temperature of the liquid crystal panel
  • FIG. 26 shows the 255th floor according to the temperature of the liquid crystal panel. The time until the tone changes to 0 gradation is shown.
  • the video processing circuit 1 further includes a panel temperature acquisition unit (not shown) that acquires the temperature of the liquid crystal panel 6.
  • the gradation of the video signal may be corrected based on the ambient illuminance.
  • the value of the correction parameter is increased as the temperature of the liquid crystal panel 6 is lower than the temperature during the steady operation of the liquid crystal display device 10.
  • the liquid crystal display device 10 may be configured to perform an overshoot process in addition to the above configuration (panel temperature acquisition unit).
  • the video processing circuit generates the image signal by multiplying the gradation of the video signal by a correction parameter determined according to the ambient illuminance.
  • the correction parameter is preferably set to a value smaller than 1.
  • the correction parameter may be configured to increase in proportion to the size of the ambient illuminance as the ambient illuminance increases.
  • the correction parameter may be configured to increase according to a multi-order function as the ambient illuminance increases.
  • the correction parameter may be configured to increase stepwise as the ambient illuminance increases.
  • the video processing circuit may be configured to generate the image signal so as to cut at least one of a high gradation and a low gradation of the video signal. .
  • the liquid crystal display device may include a backlight including a light source, and the luminance of the backlight may be adjusted according to the ambient illuminance.
  • the video processing circuit multiplies the gray level of the video signal by a first correction parameter determined corresponding to the first display mode.
  • the image signal is obtained by multiplying the gradation of the video signal by a second correction parameter determined corresponding to the second display mode. It can also be configured to generate.
  • the first correction parameter is set to 1 and the second correction parameter is set to a value smaller than 1.
  • the video processing circuit in the second display mode, is configured to cut the image signal so as to cut at least one of the high gradation and the low gradation of the video signal. It can also be set as the structure which produces
  • the video processing circuit further includes a panel temperature acquisition unit that acquires the temperature of the liquid crystal panel, and the video processing circuit acquires the liquid crystal acquired from the panel temperature acquisition unit.
  • the image signal may be generated such that the gradation range that can be displayed on the liquid crystal panel decreases as the panel temperature and the ambient illuminance acquired from the external light detection unit decrease.
  • the video processing circuit further includes a panel temperature acquisition unit that acquires the temperature of the liquid crystal panel, and the video processing circuit acquires the liquid crystal acquired from the panel temperature acquisition unit.
  • the image signal may be generated so that the gradation range that can be displayed on the liquid crystal panel decreases as the panel temperature decreases.
  • the video processing circuit performs gradation transition enhancement processing for setting the output gradation of the current frame based on the input gradation of the current frame and the gradation of the previous frame.
  • the gradation transition enhancement processing unit can set the output gradation for the image signal.
  • the highest gradation (white) can be reduced, so that overshoot processing can be appropriately performed.
  • the present invention can be used as a display device for devices such as a thin television device, a thin display device, and a mobile phone.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (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 Display Device Control (AREA)

Abstract

Selon la présente invention, un circuit de traitement vidéo (1) dans un dispositif d'affichage à cristaux liquides (10) génère des signaux d'image, de telle sorte que plus l'éclairage ambiant obtenu à partir d'une unité de détection de lumière extérieure (2) est petit, plus la plage de gradation qui peut être affichée par un panneau de cristaux liquides (6) est petite. Par suite, la présente invention porte sur un dispositif d'affichage à cristaux liquides apte à réduire de manière appropriée une interférence généré lors de l'observation d'une image tridimensionnelle.
PCT/JP2012/070822 2011-09-26 2012-08-16 Dispositif d'affichage à cristaux liquides WO2013046984A1 (fr)

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JP2019054513A (ja) * 2017-09-12 2019-04-04 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． ３ｄ映像提供方法及び装置
CN109584714A (zh) * 2018-11-30 2019-04-05 Oppo广东移动通信有限公司 显示屏与电子设备

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JP2011090079A (ja) * 2009-10-21 2011-05-06 Sony Corp 表示装置、表示方法およびコンピュータプログラム
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JP2011090079A (ja) * 2009-10-21 2011-05-06 Sony Corp 表示装置、表示方法およびコンピュータプログラム
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JP2019054513A (ja) * 2017-09-12 2019-04-04 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． ３ｄ映像提供方法及び装置
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CN109584714A (zh) * 2018-11-30 2019-04-05 Oppo广东移动通信有限公司 显示屏与电子设备
CN109584714B (zh) * 2018-11-30 2021-04-16 Oppo广东移动通信有限公司 显示屏与电子设备

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