WO2009157224A1 - 液晶表示装置の制御装置、液晶表示装置、液晶表示装置の制御方法、プログラムおよび記録媒体 - Google Patents
液晶表示装置の制御装置、液晶表示装置、液晶表示装置の制御方法、プログラムおよび記録媒体 Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
- G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0232—Special driving of display border areas
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0238—Improving the black level
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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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
- G09G2340/00—Aspects of display data processing
- G09G2340/04—Changes in size, position or resolution of an image
- G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
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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
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
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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
Definitions
- the present invention relates to a control device and a control method for a liquid crystal display device having a backlight.
- Patent Document 1 discloses a technique for dividing image data into a plurality of video regions and controlling the luminance of a backlight corresponding to each region according to the APL (average luminance) of each divided region. Yes.
- Patent Document 2 discloses a technique for correcting display image data in accordance with the brightness distribution of a backlight.
- Japanese Patent Gazette Patent No. 3766231 (published on November 24, 2000)
- Japanese Patent Publication Japanese Patent Laid-Open No. 2005-309338 (published on November 4, 2005)”
- the aspect ratio of the number of pixels (dot number) of the display image in the image data input to the liquid crystal display device may be different from the aspect ratio of the number of pixels of the display screen of the liquid crystal display device.
- the number of vertical and horizontal dots is not fixed as a standard format (standard), and 4096 dots in digital cinema.
- the aspect ratio is different for each image, such that a resolution of 2160 lines is used and a resolution of 3840 dots ⁇ 2160 lines is used in high vision.
- a resolution of 2048 ⁇ 1080, a resolution of 1920 ⁇ 1080, or the like is generally used.
- the number of vertical and horizontal pixels on the display screen (liquid crystal display panel) of the liquid crystal display device is determined at the time of manufacture.
- image data having various aspect ratios when image data having various aspect ratios is displayed on a common liquid crystal display device, the aspect ratio of the image data differs from the aspect ratio of the display screen of the liquid crystal display device depending on the image data.
- the conventional technique described above has a problem that the brightness of the backlight cannot be appropriately controlled at the boundary between the image display area and the image non-display area in the display screen, and the display quality of the image is deteriorated. It was.
- the luminance distribution of the light sources has a wide spread, so the luminance distribution in the liquid crystal display panel is obtained by superimposing the luminance distributions of the plurality of light sources. Become. For this reason, if the luminance of the light source in the image non-display area is set to 0, the video displayed near the boundary between the image display area and the image display area adjacent to the image non-display area becomes insufficient in luminance. It may become a thing.
- 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 including a liquid crystal display panel and a backlight unit having a plurality of light sources arranged on the back surface of the liquid crystal display panel.
- the display quality at the boundary between the image display area and the image non-display area is improved.
- a control device for a liquid crystal display device of the present invention comprises a liquid crystal display panel and a backlight unit having a plurality of light sources arranged in a matrix on the back side of the liquid crystal display panel.
- a liquid crystal display control device for controlling the operation of the liquid crystal display device, a liquid crystal control unit for controlling each pixel of the liquid crystal display panel based on the input image data, and each light source based on the input image data.
- the peripheral edge of the input image data or the image data obtained by performing predetermined processing on the input image data An image size adjustment unit for generating size-adjusted image data having an aspect ratio corresponding to the aspect ratio of the liquid crystal display panel by adding dummy image data to the unit
- the backlight control unit divides the size-adjusted image data into a plurality of blocks respectively corresponding to the arrangement positions of the light sources, and a light source corresponding to an image display area that is an image display area corresponding to the input image data.
- the light source to be obtained is obtained by further dividing the average luminance level of each pixel included in the block of the image display area adjacent to the block corresponding to the light source or the block of the image display area adjacent to the block corresponding to the light source. Based on the average luminance level of the small blocks adjacent to the block in the image non-display area corresponding to the light source. There are is characterized by determining the light emission luminance.
- the backlight control unit is configured to use the gradation value of each pixel included in the block corresponding to the light source.
- the light emission luminance is determined based on the maximum value of the image display area adjacent to the block corresponding to the light source The average luminance level of each pixel included in the block or the image non-display area corresponding to the light source among the plurality of small blocks obtained by further dividing the block of the image display area adjacent to the block corresponding to the light source.
- the light emission luminance is determined based on the average luminance level of the small blocks adjacent to the block. Thereby, it is possible to prevent the display quality from being deteriorated due to insufficient brightness of the irradiation light from the backlight unit in the image display area adjacent to the image non-display area.
- the backlight control unit displays an image closest to the block corresponding to the light source for a light source corresponding to the non-display area of the light source that has no block in the image display area adjacent to the block corresponding to the light source.
- the light emission luminance may be determined based on the average luminance level of the block.
- the light emission luminance of the light source having no block in the image display area adjacent to the block corresponding to the light source is set to the block in the nearest image display area or the image display area.
- the backlight control unit sets the emission luminance of each light source corresponding to the block of the image non-display area at a distance from the image display area. It is good also as a structure set so that it may become so dark that it increases.
- the influence of the light source on the display characteristics of the image display area becomes smaller as the position of the light source is farther from the image display area. Therefore, by setting the light emission luminance of each light source corresponding to the block of the image non-display area so that it becomes darker as the distance from the image display area increases, the display quality of the image display area is suppressed and the image non-display area is suppressed.
- the power consumption can be reduced by lowering the light emission luminance of the light source corresponding to.
- a luminance distribution data generation unit that generates luminance distribution data in the liquid crystal display panel by irradiation light from each light source when the light sources emit light with the light emission luminance determined by the backlight control unit
- the liquid crystal control unit includes a correction unit that corrects the input image data based on the luminance distribution data, and controls each pixel of the liquid crystal display panel based on the image data corrected by the correction unit. It is good.
- the liquid crystal control unit corrects the input image data based on the luminance distribution data by the correction unit, and controls each pixel of the liquid crystal display panel based on the corrected image data. Thereby, the luminance distribution of the display image visually recognized by the user can be appropriately controlled.
- the image size adjustment unit may add the dummy image data so that an image corresponding to the input image data is displayed at substantially the center of the liquid crystal display panel.
- the image corresponding to the input image data can be displayed at the approximate center of the liquid crystal display panel.
- the liquid crystal display device of the present invention includes a liquid crystal display panel, a backlight unit having a plurality of light sources arranged in a matrix on the back side of the liquid crystal display panel, and any of the control devices described above.
- a method for controlling a liquid crystal display device of the present invention includes a liquid crystal display panel and a backlight unit having a plurality of light sources arranged in a matrix on the back side of the liquid crystal display panel.
- a liquid crystal display device control method for controlling the operation of the liquid crystal display device comprising: a liquid crystal control step for controlling each pixel of the liquid crystal display panel based on input image data; and a method for controlling each light source based on input image data.
- the backlight control process for controlling the light emission state differs from the aspect ratio of the input image data and the aspect ratio of the liquid crystal display panel, the peripheral edge of the input image data or the image data obtained by performing a predetermined process on the input image data
- the backlight control step includes a step of dividing the size-adjusted image data into a plurality of blocks respectively corresponding to the arrangement positions of the light sources, and an image display region which is an image display region corresponding to the input image data And a display area of an image corresponding to the dummy image data, and a step of determining a light emission luminance based on a maximum value among gradation values of each pixel included in a block corresponding to the light source.
- the average luminance level of each pixel included in the block of the image display area adjacent to the block corresponding to the light source, or the block of the image display area adjacent to the block corresponding to the light source is characterized by a step of determining a light emission luminance based on the average luminance level of the click.
- each pixel included in the block of the image display area adjacent to the block corresponding to the light source Of the small block adjacent to the block of the image non-display area corresponding to the light source among a plurality of small blocks obtained by further dividing the block of the image display area adjacent to the block corresponding to the light source. Determining emission brightness based on the average brightness level. Thereby, it is possible to prevent the display quality from being deteriorated due to insufficient brightness of the irradiation light from the backlight unit in the image display area adjacent to the image non-display area.
- the image processing apparatus may be realized by a computer.
- Possible recording media are also included in the scope of the present invention.
- FIG. 1 is a block diagram illustrating a schematic configuration of a liquid crystal display device according to an embodiment of the present invention.
- (A) And (b) is explanatory drawing which shows the example of the coupling
- (A) And (b) is explanatory drawing which shows an example of the production
- (A) is explanatory drawing which shows an example of the image displayed on a liquid crystal display panel
- (b) is the liquid crystal display panel by the irradiation light of the backlight unit by which the light emission state was controlled based on the image of (a). It is explanatory drawing which shows luminance distribution.
- FIG. 2 is a block diagram illustrating a schematic configuration of an upscale circuit provided in the liquid crystal display device illustrated in FIG. 1.
- FIG. 2 is a block diagram illustrating a schematic configuration of an edge detection circuit provided in the liquid crystal display device illustrated in FIG. 1.
- summary of the difference calculation process performed in the liquid crystal display device shown in FIG. It is explanatory drawing which shows an example of the result of having performed the difference calculation process in the liquid crystal display device shown in FIG.
- FIG. 1 is a block diagram showing a schematic configuration of a liquid crystal display device 100 according to the present embodiment. As shown in this figure, the liquid crystal display device 100 includes a control device 1, a liquid crystal display panel 2, and a backlight unit 3.
- the liquid crystal display panel 2 is for displaying an image according to the image data.
- a panel having a display size of 4096 ⁇ 2160 dots is used.
- the present invention is not limited to this, and various conventionally known liquid crystal display panels can be used.
- the backlight unit 3 is provided on the back side with respect to the display surface of the liquid crystal display panel 2 and irradiates the liquid crystal display panel 2 with light for display, and includes a plurality of LEDs (light sources) as light sources. Yes.
- a backlight unit including LEDs arranged in an 8 ⁇ 4 matrix as a light source is used.
- the number of LEDs is not limited to this, and for example, a configuration having a larger number of LEDs may be adopted.
- this embodiment demonstrates the case where LED is used for a light source, the light source of this invention is not limited to this, For example, other light emitting elements, such as EL (Electro-Luminescence) light emitting element, are used.
- this embodiment demonstrates the case where what is called a direct illuminating device which arrange
- an edge light type illumination in which a single light guide plate is provided below the light emitting surface of the lighting device, and a plurality of light source substrates are arranged in parallel to at least one of the four sides surrounding the light guide plate.
- Another type of lighting device such as a tandem type in which a light guide plate is provided for each device or light emitting element may be used.
- the control device 1 includes a preprocessing circuit 10, division circuits 11 a and 11 b, upscale circuits 12 a to 12 d, a down converter 13, correction circuits 14 a to 14 d, a liquid crystal drive circuit 15, a display map generation circuit 16, and an LED resolution signal generation circuit 17. , A luminance distribution data generation circuit 18, an LED drive circuit 19, and switches SW1, SW2a to SW2d.
- dummy image data for example, black pixels
- the preprocessing circuit 10 performs dummy operations on the right and left sides of the input image data so that the position of the image corresponding to the input image data is shifted to the right by 128 dots from the left end of the display screen of the liquid crystal display panel 2. Add image data.
- the preprocessing circuit 10 outputs the image data after the adjustment processing to the dividing circuit 11a and the down converter 13 when the input image data is 4K2K class image data, and the input image data is an image of 2K1K class or less. If it is data, it is output to the dividing circuit 11b and the display map generating circuit 16.
- the image data input to the control device 1 is divided image data obtained by dividing the original image data (4K2K class image data) into a plurality of pieces according to the display area
- the divided image data is subjected to the adjustment process described above and output to the dividing circuit 11a, and image data obtained by combining the divided image data after the adjustment process is output to the down converter 13.
- the dividing circuit 11a outputs the divided image data input from the preprocessing circuit 10 to the correction circuits 14a to 14d, respectively.
- a non-display area is not generated between the divided image data or the display position of each divided image data is not shifted.
- An additional position of dummy image data for each divided image data is set for each divided image data. For example, as shown in FIG. 2A, when dummy image data is uniformly added to the right side and the lower side of each divided image data, a non-display area is generated between the divided image data.
- the division circuit 11a shows the position where the dummy image data is added so that a non-display area is not generated between the divided image data and the display position of each divided image data is not shifted. Control for each area.
- the preprocessing circuit 10 determines that the input image is input when the image data input to the control device 1 is image data for one screen and the aspect ratio of the input image data is different from the aspect ratio of the liquid crystal display panel 2. Dummy image data (for example, black pixels) is added around the image corresponding to the input image data so that the data is displayed at the center of the display screen of the liquid crystal display panel 2.
- the aspect ratio (size) of the image data for example, for the horizontal size, the number of clock signals during the period in which the data enable signal is at a high level after the horizontal synchronization signal is input is counted. Can be detected. Further, the vertical size can be detected by counting the number of times the data enable signal is switched from the low level to the high level after the vertical synchronization signal is input.
- the division circuit (first division unit) 11a When the image data input from the preprocessing circuit 10 is a video signal H of 4K2K class (resolution of about 4000 dots ⁇ 2000 dots), the division circuit (first division unit) 11a outputs a predetermined number of the video signals H.
- the image data is divided into image data for each display area (four in this embodiment), and the divided image data is output to the correction circuits 14a to 14d via the switches SW2a to SW2d.
- the dividing circuit 11a converts the image data into the upper left, upper right, lower left, and lower right image data (each 1920 ⁇ 1080 dots). ).
- the number of image divisions and the arrangement positions of the divided regions are not limited to this.
- the divided areas may be divided so that they are arranged in the horizontal direction, or the divided areas may be divided so that they are arranged in the vertical direction.
- Which division method is adopted may be selected in view of characteristics of each division method, circuit technology at the time of implementation, liquid crystal panel technology, and the like.
- the image data is divided into four upper left, upper right, lower left, and lower right image data as in the present embodiment, the image data of each area becomes 2K1K image data, and is therefore used in a conventional 2K1K class display device.
- the driving method can be applied as it is, and the same signal processing circuit (signal processing LSI) as the conventional one used in the 2K1K class can be used. Therefore, there is an advantage that the manufacturing cost and the development cost can be reduced.
- the dividing circuit 11a converts each divided image data into a correction circuit via the switches SW2a to SW2d. Output to 14a to 14d.
- the switches SW2a to SW2d are divided into a dividing circuit 11a and correction circuits 14a to 14d when the image data input to the control device 1 is a plurality of divided image data for the 4K2K class video signal H or 4K2K class image data.
- a control unit (not shown) is connected so that the upscale circuits 12a to 12d and the correction circuits 14a to 14d are respectively connected when the video signal L is 2K1K class (resolution of about 2000 dots ⁇ 1000 dots) or less. It is switched by.
- the downconverter (downconverter) 13 downconverts the video signal H into image data of 2K1K class (1920 ⁇ 1080 dots in this embodiment). (Reduction conversion) and output to the display map generation circuit 16 via the switch SW1.
- the down-conversion method is not particularly limited. For example, an average value of four pixels of the input image signal may be set as a value of one pixel at a position corresponding to these four pixels in the output image signal.
- the switch SW1 generates a display map for the video signal output from the down converter 13 when the image data input to the control device 1 is a plurality of divided image data for the 4K2K class video signal H or 4K2K class image data.
- the video signal L is input to the circuit 16 and is a 2K1K class video signal L, the video signal L is switched by a control unit (not shown) so as to be input to the display map generation circuit 16.
- the dividing circuit (second dividing unit) 11b divides the 2K1K class video signal L input to the control apparatus 1 into image data of a predetermined number of regions, and outputs the divided image data to the upscale circuits 12a to 12d, respectively. To do.
- 2K1K class high-definition data is input as the video signal L and is divided into four regions of image data in the upper left, upper right, lower left, and lower right.
- the number of image divisions and the arrangement positions of the divided regions are not limited to this.
- the upscaling circuits (upscaling units) 12a to 12d each receive the image data divided by the dividing circuit 11b, and perform upscaling processing on the input image data.
- the upscale circuits 12a to 12d output the image data subjected to the upscale processing to the correction circuits 14a to 14d via the switches SW2a to SW2d, respectively. Details of the image data division processing and upscaling processing will be described later.
- the correction circuits (correction units) 14 a to 14 d correct the image data according to the luminance distribution data input from the luminance distribution data generation circuit 18 described later, and output the corrected image data to the liquid crystal drive circuit 15. That is, in the LED backlight system in which a plurality of LEDs are arranged on the back surface of the liquid crystal display panel, a luminance distribution is generated such that the luminance increases immediately above each LED and decreases as the distance from the LED increases. Further, the luminance distribution generated in each part of the liquid crystal display panel 2 by the LED backlight is obtained by superimposing the luminance distributions of the respective LEDs.
- the correction circuits 14a to 14d reduce the transmittance of the liquid crystal at a position directly above the LED according to the luminance distribution data input from the luminance distribution data generation circuit 18, and increase the transmittance as the distance from the correction circuit 14a to 14d increases. Correct the image data.
- FIG. 3 shows the gradation value of the input image signal at the target pixel and the display image when the liquid crystal display panel has an input gradation of 64 gradations (0 to 63) and a gradation luminance characteristic of ⁇ 2.2. It is a graph showing the relationship with the luminance, the solid line is when the luminance of the incident light from the backlight to the target pixel is 100%, and the broken line is the case where the luminance of the incident light from the backlight to the target pixel is 30% An example is shown. In the example shown in this figure, when the gradation value of the input image signal is 20, and the luminance of the backlight is 100%, the luminance of the display image is about 8%.
- FIG. 4 shows an input image when the input gradation is 64 gradations (0 to 63), the gradation luminance characteristic of the liquid crystal display panel is ⁇ 2.2, and the backlight luminance is set to 30%. It is a graph which shows the relationship between the gradation value of a signal, and a correction gradation value. As shown in this figure, even if the backlight brightness is 30%, the gradation values 0 to 32 of the input image signal are corrected (converted) to 0 to 55 without changing the brightness of the display image. Display can be made. In addition, this makes it possible to increase the contrast by lowering the display brightness when displaying a black image. In addition, power consumption can be reduced by reducing the luminance of the backlight.
- the configuration is not limited to the configuration in which the corrected gradation value is calculated, for example, an LUT (Look Up Table) indicating the relationship between the input gradation value and the corrected gradation value is prepared for each backlight luminance.
- the corrected gradation value may be determined based on this LUT. Also, depending on the LSI to be designed, such an exponential calculation may not be appropriately processed. In such a case, it is preferable to perform gradation conversion by LUT.
- the corrected gradation value is calculated using an exponential operation. It is often more efficient to determine a combination of an appropriate LUT and interpolation operation than to do this.
- the liquid crystal drive circuit (liquid crystal drive unit) 15 controls the liquid crystal display panel 2 based on the image data input from the correction circuits 14a to 14d, and displays an image corresponding to the image data on the liquid crystal display panel 2.
- the liquid crystal driving circuit 15 is described as one block. However, the present invention is not limited to this, and the liquid crystal driving circuit 15 may be configured by a plurality of blocks.
- liquid crystal drive circuits 15a to 15d may be provided corresponding to the correction circuits 14a to 14d, and the divided regions in the liquid crystal display panel 2 may be driven by the liquid crystal drive circuits.
- each region can be easily matched, which has the advantage of good controllability, but the number of input / output pins increases.
- the circuit size (IC size) becomes large.
- the chip size can be reduced (in particular, in the case of the present embodiment, each divided area is a 2K1K class, so that the conventional 2K1K class display device is provided.
- the display map generation circuit (display map generation unit) 16 is configured so that when the aspect ratio of the image data input via the switch SW1 is different from the aspect ratio of the number of LEDs provided in the backlight unit 3, both of these aspect ratios are displayed. Adjust the size of the image data so that the ratio is close. That is, the position corresponding to the image data input via the switch SW1 is specified on the position on the area corresponding to each LED of the backlight unit 3, and the image is input via the switch SW1. Mapping image data is generated by mapping the image data onto the image data of an integral multiple of the resolution according to the arrangement of each LED provided in the backlight unit 3 according to the above-described specific result.
- the dummy image data is added to the image data as necessary so that these two aspect ratios coincide with each other. You may do it.
- the dummy image data may be copied from adjacent pixel data as shown in FIG. 5, or may be an average value of a block composed of a plurality of pixels including adjacent pixels.
- the LED resolution signal generation circuit (LED luminance setting unit) 17 generates a luminance signal of LED resolution (8 ⁇ 4 in the present embodiment) based on the mapping image data input from the display map generation circuit 16, and luminance distribution data This is output to the generation circuit 18 and the LED drive circuit 19.
- the LED resolution signal generation circuit 17 converts each pixel of the mapping image data (2048 ⁇ 1080 dots) input from the display map generation circuit 16 into the backlight unit 3. Is divided into a plurality of blocks (8 ⁇ 4 blocks) corresponding to each LED. Therefore, each block includes data for 256 ⁇ 270 pixels in the mapping image data. For the block corresponding to the image display area, the luminance signal for each block is set based on the maximum gradation value among the gradation values of the pixels included in each block. That is, among the blocks shown in FIG.
- the maximum luminance value in each block is used as the reference luminance.
- a luminance signal corresponding to each block is set based on the reference luminance value.
- the LED resolution signal generation circuit 17 generates a block in an area (image non-display area) where there is no image data in the liquid crystal display panel 2 that occurs when the aspect ratio of the input image data is different from the aspect ratio of the liquid crystal display panel 2. Generates a luminance signal based on the average luminance level (APL) in the block in the image display area adjacent to the block or the average luminance level (APL) in a part of the block adjacent to the image non-display area.
- APL average luminance level
- the block of the image display area adjacent to the block of the image non-display area is further divided into a plurality of small blocks.
- the data for 85 ⁇ 90 pixels or 86 ⁇ 90 pixels in FIG. is calculated for each of the small blocks adjacent to the block in the non-image display area (for example, the small blocks A3, A6, and A9 for the block a7).
- APL average luminance level
- the blocks a1, b1, c1, d1, a8, b8, c8, and d8 which are blocks of the image non-display area, each small block adjacent to the image non-display area in the block of the image display area adjacent to each of these blocks.
- the maximum value of the average luminance levels of the blocks or the average value of the average luminance levels of these small blocks is set as a reference luminance value, and a luminance signal is set based on this reference luminance value. Therefore, in the example of FIG. 6B, the luminance signal corresponding to the block a8 has the maximum value among the average luminance levels of the small blocks A3, A6, A9 or the average luminance level of the small blocks A3, A6, A9.
- the luminance signal set based on the average value and corresponding to the block b8 is set to the maximum value among the average luminance levels of the small blocks B3, B6, B9 or the average value of the average luminance levels of the small blocks B3, B6, B9. Set based on.
- the luminance signals corresponding to the blocks a1, b1, c1, d1, c8, d8 are also set in the same way.
- the luminance corresponding to this block a9 may be set in the same manner as the luminance signal corresponding to the block a8, and a coefficient corresponding to the distance from the image display area is set to the average value or the maximum value of the average luminance levels of the small blocks A3, A6, A9.
- a luminance signal corresponding to the block a9 may be set based on the multiplied value. In this case, the coefficient is appropriately set according to the luminance distribution characteristics of the emitted light of each LED so that the LEDs arranged on the back surface of the image non-display area do not adversely affect the image quality of the image display area. Good.
- the luminance distribution of each LED provided in the backlight unit 3 has a broadness, and the luminance distribution in the liquid crystal display panel is obtained by superimposing the luminance distributions of a plurality of LEDs.
- FIG. 7 shows the irradiation light from the backlights of the blocks b1 to b7 in the liquid crystal display panel when only the LEDs arranged immediately below the block b4 shown in FIG. 6A are turned on and the other LEDs are turned off. It is a graph which shows the luminance distribution by. FIG. 7 shows the luminance of each small block arranged in the horizontal direction when each block is divided into 3 ⁇ 3 small blocks.
- the luminance of the small block at the center in block b4 is the highest (brighter), and the luminance is lower (darker) the further away from it.
- FIG. 8 shows the backlight of the blocks b1 to b7 in the liquid crystal display panel when only the LEDs arranged immediately below the blocks b1 to b7 shown in FIG. 6A are turned on and the other LEDs are turned off. It is a graph which shows the luminance distribution by the irradiation light of. FIG. 8 shows the luminance of each small block arranged in the horizontal direction when each block is divided into 3 ⁇ 3 small blocks.
- substantially the same luminance is obtained for the blocks b3 to b5, while the luminance in the blocks b1, b2, b6, and b7 is lower than that of the blocks b3 to b5.
- the brightness of the blocks b3 to b5 is much higher than when only the LEDs arranged immediately below the block b4 are turned on.
- the luminance distribution in the liquid crystal display panel is obtained by superimposing the luminance distributions of a plurality of LEDs.
- the maximum value of the luminance signal corresponding to each block is the liquid crystal display when all the LEDs arranged immediately below the 3 ⁇ 3 block centering on the block are turned on at 100%.
- a value corresponding to the luminance due to the irradiation light from the backlight unit 3 of the block in the panel is set.
- the present invention is not limited to this.
- the maximum value of the luminance signal corresponding to each block may be set higher than in the above case.
- the lower part may be set lower than the above case.
- the luminance of the light emitted from the backlight of each block in the liquid crystal display panel is affected by each neighboring block, it is sufficient to change the light emission luminance of the LED arranged immediately below the adjacent block. In some cases, the required brightness cannot be secured. For this reason, it is preferable to set the luminance signal so that it does not change suddenly in each block by passing it through a low-pass filter.
- the calculation may be complicated in order to appropriately calculate the luminance of each block in consideration of the influence of the LED arranged immediately below each peripheral block, and the appropriate calculation may not always be performed. Since there is a table prepared by storing combinations of the reference luminance values determined for each block and the luminance signal setting values of the blocks corresponding to these combinations, each table set using this table is prepared. A set value of the luminance signal of the block may be set. In addition, the set value of the luminance signal of each block set using the table may be further smoothed by a low-pass filter.
- a white backlight is used, and the luminance of the white backlight is controlled using luminance information obtained from image data.
- the present invention is not limited to this.
- it is good also as a structure provided with the backlight of each color of RGB, and controlling the brightness
- the contrast is improved, but also the contrast between colors in the same area can be expanded, so that a vivid video with higher color purity can be created.
- the independence between colors can be enhanced by matching the emission spectrum of the backlight with the color filter absorption spectrum.
- each block is divided into 9 blocks of 3 ⁇ 3.
- the present invention is not limited to this. While there is an advantage that luminance discontinuity due to the backlight is less likely to occur as the number of divisions increases, there is a problem that the circuit scale increases when the number of divisions increases excessively. Therefore, the number of divisions may be set as appropriate in consideration of these characteristics.
- each block has 8 ⁇ in the case where 128 ⁇ 128 pixels exist in each block. There was no problem that could be visually recognized even in the case of 8 divided into 64. Further, when reproducing a DVD image (an image of about 720 ⁇ 480 dots) and the like, there is no particular problem even with a division number of about 4 ⁇ 4. It should be noted that a pure 4K video (originally generated as 4K2K class video data) preferably has a number of divisions of 16 ⁇ 16 or more in order to display a higher quality image.
- the LED resolution (the number of LEDs arranged) is set to 8 ⁇ 4 for convenience of explanation.
- the present invention is not limited to this, and the LED resolution may be increased to improve the image quality.
- the LED resolution is about 64 ⁇ 32 to 16 ⁇ 8 so that the block corresponding to one LED corresponds to a pixel of about 64 dots ⁇ 64 dots to 256 dots to 256 dots in 4K2K class image data. It is preferable to set to.
- the LED resolution By setting the LED resolution to 16 ⁇ 8 or more, it is possible to prevent the user from visually recognizing the difference in luminance between the blocks and to make the user visually recognize a sharp image.
- the LED resolution is preferably set to 64 ⁇ 32 or less.
- the shape of the block corresponding to each LED is not limited to a square, and may be appropriately set according to the number of members and the convenience of arrangement.
- Luminance data (luminance distribution data) of each pixel obtained by superimposing the luminance distributions generated on the display panel 2 is generated, and the generated luminance distribution data is divided for each display area in the liquid crystal display panel 2 to correct the correction circuit 14a. To 14d.
- FIG. 9A shows an example of image data displayed on the liquid crystal display panel 2
- FIG. 9B shows an example of luminance distribution data corresponding to this image data.
- the LED drive circuit (LED drive unit) 19 controls the brightness of each LED based on the LED resolution brightness signal generated by the LED resolution signal generation circuit 17. That is, the LED drive circuit 19 controls the light emission luminance of each LED so as to be a luminance corresponding to the luminance of the dot corresponding to each LED in the luminance signal.
- FIG. 10 is an explanatory diagram schematically showing processing in the control device 1 in this case.
- the preprocessing circuit 10 generates image data Q1, Q2, Q3, and Q4 obtained by expanding each image data P1, P2, P3, and P4 to 2040 dots ⁇ 1080 dots, and outputs the generated image data to the down converter 13 and the dividing circuit 11a. .
- the dividing circuit 11a outputs the image data Q1, Q2, Q3 and Q4 to the correction circuits 14a to 14d via the switches SW2a to SW2d.
- the preprocessing circuit 10 performs the above-mentioned expansion by right-justifying the upper left and lower left image data and adding dummy image data (for example, black pixels) on the left side, and for the upper right and lower right image data.
- the above-mentioned expansion is performed by left-justifying and assigning dummy image data (for example, black pixels) on the right side. If the vertical size of the input image data is different from the vertical size of the liquid crystal display panel, the upper left and upper right image data is bottom-padded and dummy image data is added to the upper left, and the lower left and lower right For the image data, the dummy image data may be added to the lower side.
- dummy image data for example, black pixels
- the down converter 13 down-converts 4096 ⁇ 2160 dot image data obtained by combining the image data Q1, Q2, Q3, and Q4, generates 1920 ⁇ 1080 dot image data R1, and displays it via the switch SW1. Output to the map generation circuit 16.
- the display map generation circuit 16 performs mapping processing that matches the aspect ratio of the input image data with the aspect ratio of the backlight unit 3, and generates mapping image data R2. At this time, for an area where no image data exists, image data of peripheral pixels may be copied, or an average value of image data of a plurality of pixels including the peripheral pixels may be used.
- the LED resolution signal generation circuit 17 generates a luminance signal S1 of LED resolution based on the mapping image data generated by the display map generation circuit 16, and uses the generated luminance signal S1 as the luminance distribution data generation circuit 18 and the LED. Output to the drive circuit 19.
- the method for generating the luminance signal S1 is as described above.
- the luminance distribution data generation circuit 18 is a luminance distribution (in the liquid crystal display panel 2 by light emitted from each LED when the LEDs are driven based on the LED resolution luminance signal S1 input from the LED resolution signal generation circuit 17 ( (Luminance of each pixel) T is calculated, and the calculated luminance distribution T is divided for each display area in the liquid crystal display panel 2 to generate luminance distribution signals T1 to T4 for each area, and output them to the correction circuits 14a to 14d. .
- the correction circuits 14a to 14d correct the gradation levels of the image data Q1 to Q4 according to the luminance distribution signals T1 to T4 input from the luminance distribution data generation circuit 18, and drive the corrected image data U1 to U4 by liquid crystal Output to the circuit 15.
- the liquid crystal drive circuit 15 displays an image corresponding to the image data U1 to U4 input from the correction circuits 14a to 14d in each display area of the liquid crystal display panel 2.
- the LED drive circuit 19 controls the light emission state of each LED according to the luminance signal input from the LED resolution signal generation circuit 17.
- the preprocessing circuit 10 adds dummy image data (for example, black pixels) to the image data P1 of 1920 dots ⁇ 1080 dots, and an image of 2048 ⁇ 1080 dots having the same aspect ratio as that of the liquid crystal display panel 2. Extends to data PX1. At this time, the preprocessing circuit 10 adds dummy image data to the peripheral portion of the image data P1 so that the image corresponding to the image data P1 is finally displayed near the center of the display area of the liquid crystal display panel 2. .
- the image data PX1 generated by the preprocessing circuit 10 is output to the dividing circuit 11b and the display map generating circuit 16.
- the display map generation circuit 16 performs mapping processing that matches the aspect ratio of the input image data with the aspect ratio of the backlight unit 3, and generates mapping image data R2. At this time, for an area where no image data exists, image data of peripheral pixels may be copied, or an average value of image data of a plurality of pixels including the peripheral pixels may be used.
- the LED resolution signal generation circuit 17 generates a luminance signal S1 of LED resolution based on the mapping image data generated by the display map generation circuit 16, and uses the generated luminance signal S1 as the luminance distribution data generation circuit 18 and the LED. Output to the drive circuit 19.
- the method for generating the luminance signal S1 is as described above.
- the luminance distribution data generation circuit 18 calculates a luminance distribution (luminance of each pixel) T in the liquid crystal display panel 2 when each LED is driven based on the LED resolution luminance signal S1 input from the LED resolution signal generation circuit 17. Then, the calculated luminance distribution T is divided for each display area in the liquid crystal display panel 2, and the luminance distribution signals T1 to T4 of each display area are output to the correction circuits 14a to 14d, respectively.
- the dividing circuit 11b divides the image data P1 input from the preprocessing circuit 10 into image data corresponding to the four areas of the upper left, lower left, upper right, and lower right, and each of the divided image data QX1 to Qx4 is divided. Output to the upscale circuits 12a to 12d.
- the upscale circuits 12a to 12d upconvert the divided image data QX1 to QX4 into image data of 2048 ⁇ 1080 dots, respectively, and output them to the correction circuits 14a to 14d. Details of the dividing process in the dividing circuit 11b and the upscaling processes in the upscale circuits 12a to 12d will be described later.
- the correction circuits 14a to 14d correct the gradation levels of the image data Q1 to Q4 according to the luminance distribution signals T1 to T4 input from the luminance distribution data generation circuit 18, and drive the corrected image data U1 to U4 by liquid crystal Output to the circuit 15.
- the liquid crystal drive circuit 15 displays an image corresponding to the image data U1 to U4 input from the correction circuits 14a to 14d in each display area of the liquid crystal display panel 2.
- the LED drive circuit 19 controls the light emission state of each LED according to the luminance signal input from the LED resolution signal generation circuit 17.
- the correction circuit is divided into four systems of the correction circuits 14a to 14d.
- the present invention is not limited to this.
- the luminance distribution data generation circuit 18 outputs the luminance distribution T for the entire area of the liquid crystal display panel 2 to the correction circuit, and the correction circuit corrects the gradation values of the image data Q1 to Q4 based on the luminance distribution T. Then, the corrected image data U1 to U4 may be output to the liquid crystal driving circuit 15.
- the backlight unit 3 may be one that can independently control the luminance of each color of RGB, or may be one that cannot perform luminance control for each color, such as a white LED or CCFL.
- the display map generation circuit 16 converts the input RGB color space image data into YUV color space image data
- the luminance distribution data generation circuit 18 may convert data in the YUV color space into data in the RGB color space and output the data to the correction circuits 14a to 14d.
- FIG. 11 is an explanatory diagram schematically showing processing in the dividing circuit 11b and the upscale circuits 12a to 12d.
- the dividing circuit 11b converts this input image data into four divided image data of (1K + ⁇ ) ⁇ (0.5K + ⁇ ). To divide.
- the broken line portion ( ⁇ portion) shown in FIG. 11 is an overlap portion with other adjacent divided image data.
- the upscale circuits 12a to 12d perform interpolation processing (upscale processing) on each divided image data divided as described above, and generate 2K1K post-interpolation image data (upscaled image data).
- the upscale circuits 12a to 12d perform the above interpolation processing in parallel.
- the correction circuits 14a to 14d perform the above-described correction processing on each post-interpolation image data interpolated by the upscale circuits 12a to 12d, and the liquid crystal driving circuit 15 stores and corrects each of the post-interpolation processing and correction processing.
- a divided video signal corresponding to the subsequent image data is generated, and an image corresponding to each divided video signal is displayed in each divided region of the liquid crystal display panel 2.
- FIG. 12 is a block diagram showing a schematic configuration of the upscale circuits 12a to 12d.
- each of the upscale circuits 12a to 12d includes an edge detection circuit 21 and an interpolation circuit 22.
- the edge detection circuit 21 detects the position and direction of the edge in the divided image data.
- the interpolation circuit 22 performs an interpolation process using different interpolation methods for the edge portion and the portion other than the edge portion. Specifically, for the edge portion, interpolation is performed using the average value of the pixel values of pixels adjacent in the edge direction, and for other than the edge portion, interpolation is performed using the weighted average value of the pixel values of pixels adjacent to all directions. To do.
- FIG. 13 is a block diagram showing a schematic configuration of the edge detection circuit 21.
- the edge detection circuit 21 includes a difference circuit 31, a filter rotation circuit 32, a direction setting circuit 33, an averaging circuit 34, a correlation calculation circuit 35, and an edge identification circuit 36.
- the difference circuit 31 calculates a difference image data by performing a difference calculation using a difference filter on the input image data, and outputs the calculated difference image data to the averaging circuit 34 and the correlation calculation circuit 35.
- a differential filter in which a filter coefficient is set for each dot of 3 dots ⁇ 3 dots is applied to a 5 dot ⁇ 5 dot block centered on the target pixel in the input image data. Applying this, a difference calculation result of 3 dots ⁇ 3 dots centered on the target pixel is obtained.
- the pixel value of each dot in the input image data is dij (i and j are integers of 1 to 3)
- the difference filter is aij
- the pixel value of each dot in the difference calculation result is bkl (k , L is an integer from 1 to 3)
- the difference filter aij is a 1: 2: 1 filter shown below,
- the difference filter aij is not limited to this, and any filter can be used as long as it can extract an edge in an image by calculation using a differentiation or difference of gradation values near the target pixel.
- the following 3: 2: 3, 1: 1: 1, or 1: 6: 1 filter may be used.
- Etc. may be used.
- the difference filter is expressed as a: b: a as described above, the greater the weight of b, the more accurately the neighborhood of the pixel of interest can be evaluated, but the weaker against noise.
- the smaller the weight of b the easier it is to miss a small change, although the state around the pixel of interest can be comprehensively captured.
- the filter coefficient of the difference filter may be appropriately selected according to the target image characteristics. For example, in a content such as a photograph that is essentially dense and less blurry, it is easier to grasp the feature when the weight of b is larger.
- a 3 dot ⁇ 3 dot filter is used as the difference filter.
- the present invention is not limited to this.
- a 5 dot ⁇ 5 dot or 7 dot ⁇ 7 dot difference filter may be used.
- the filter rotation circuit 32 performs a rotation process on the difference filter used in the difference circuit 31.
- the direction setting circuit 33 controls the rotation of the difference filter by the filter rotation circuit 32 and outputs a signal indicating the application state of the difference filter to the edge identification circuit 36.
- the difference calculation is performed on the input image data using the difference filter aij to perform horizontal edge detection processing, and then the filter obtained by rotating the difference filter aij by 90 degrees is used.
- the vertical edge is detected by performing the difference calculation again on the input image data.
- the edge detection processing in the horizontal direction and the vertical direction may be performed in parallel.
- the difference circuit 31, the filter rotation circuit 32, the direction setting circuit 33, the averaging circuit 34, the correlation calculation circuit 35, Two sets of edge identification circuits 36 may be provided.
- FIG. 15 shows an image with sharp edges in the vertical direction (image A), an image with thin lines extending in the vertical direction (image B), an image with messy lines (image C), and 1 for each of these images.
- FIG. 6 is an explanatory diagram showing a result of performing a difference calculation in the horizontal direction and the vertical direction using a difference filter of 2: 1: 1;
- the pattern of 3 dots ⁇ 3 dots around the target pixel (center pixel) in the input image data is the same, and the difference calculation result (median value) in the horizontal direction of the target pixel is 4 in all cases.
- the ratio of the average value for the 3 dot ⁇ 3 dot block centered on the target pixel in the horizontal difference calculation result to the median value is 0.67 for image A, 0.33 for image B, and 0.33 for image C.
- the numerical value is larger as there is a clear edge (or an image close to the edge). That is, the thin line image B may be an edge but may be a pattern (texture), and the average value of the difference calculation result (a value indicating edge property (edge-likeness)) is half that of the image A. There is only a degree. Further, the image C of the messy line cannot be distinguished whether it is a real edge or noise, and the average value of the difference calculation results is about 1/3 compared to the image A.
- edge detection process may be performed, and the processing result may be databased as an exception process when an erroneous detection occurs in edge detection using 3 dot ⁇ 3 dot difference image data.
- edge detection with higher accuracy can be performed. For example, even an edge that is buried in a texture with high periodicity can be detected appropriately.
- FIG. 16 shows a sharp edge image (image D), a thin line image (image E) extending in the diagonal direction, a messy line image (image F), and 1 for each of these images. : It is explanatory drawing which shows the result of having performed the difference calculation of the horizontal direction and the vertical direction using the difference filter of 2: 1.
- the ratio of the average value for the 3 dot ⁇ 3 dot block centered on the target pixel to the median value is 0.67 for image D and 0 for image E.
- the numerical value increases as there is a clear edge (or an image close to the edge).
- the ratio of the average value to the median value for the 3 dot ⁇ 3 dot block is 0.06, and it is difficult to be recognized as an edge.
- FIG. 17 shows an image with an edge with an inclination 1/2 (image G), an image with an edge with inclination 1 (image H), an image with an edge with inclination 2 (image I), and 1: 2 for each of these images: It is explanatory drawing which shows the result of having performed the difference calculation of the horizontal direction and the vertical direction using 1 difference filter. Since each image in FIG. 17 is an edge portion image, the ratio of the average value to the median value of the 3 dot ⁇ 3 dot block centered on the target pixel in the difference calculation results in the horizontal direction and the vertical direction is increased. Yes.
- the ratio of the median value of the difference calculation results in the horizontal direction and the median value of the difference calculation results in the vertical direction in these images is 2/4 for the image G, 3/3 for the image H, and 4/2 for the image I. And coincides with the inclination of the edge in each image.
- the median value the value of the pixel of interest
- the slope of the edge is calculated on the basis of the ratio. As for the edge in the horizontal direction or the vertical direction, since either the median value in the difference calculation result in the horizontal direction or the median value in the difference calculation result in the horizontal direction is 0, the edge direction can be easily determined.
- the averaging circuit 34 Based on the difference image data bij input from the difference circuit 31, the averaging circuit 34 generates averaged image data in which the pixel value of the target pixel is a value obtained by averaging the pixel values of the target pixel and its surrounding pixels. To do.
- the above averaging process may be performed by a filter process using a low-pass filter (LPF) of 2 dots ⁇ 2 dots, for example, as shown in FIG.
- LPF low-pass filter
- a filter coefficient is set for each dot of 2 dots ⁇ 2 dots and a low pass filter is applied to a 3 dot ⁇ 3 dot block in the difference image data input from the difference circuit 31.
- An average processing result of 2 dots ⁇ 2 dots is obtained.
- the above-described averaging operation is performed such that the pixel value of each dot in the difference image data is bij (i and j are integers of 1 to 3), the low-pass filter is cij, and the pixel value of each dot in the averaged image data is b. If 'ij,
- the averaging circuit 34 calculates b13, b23, b31, b32, and b33 by sequentially shifting a 3 dot ⁇ 3 dot block in the difference image data by one dot at a time. That is, averaged image data is calculated for a total of nine pixels including the target pixel and the surrounding eight pixels. Then, the averaged image data of these nine pixels is output to the correlation calculation circuit 35.
- the edge identification circuit 36 determines whether or not the target pixel is an edge pixel by comparing the correlation value R for the target pixel input from the correlation calculation circuit 35 with a preset threshold Th. .
- the above-mentioned threshold value Th calculates the correlation value R of each pixel based on a large number of sample images, the correlation value R calculated for the pixels in the edge portion, and the correlation value R calculated for the pixels other than the edge portion. May be set in advance by conducting an experiment to compare the two.
- FIG. 19 is an explanatory diagram showing the concept of edge identification processing by the edge identification circuit 36.
- the difference image data reflects the influence of the edge portion and noise, so that the edge detection is performed using only the difference image data. Is affected by this noise.
- the difference image data obtained by performing the above-described difference calculation on this input image data has a non-zero value, and becomes zero when there is no gradation change.
- the value of the difference image data is a non-zero value.
- noise can be removed from the difference image data as shown in FIG.
- noise that exists in only one dot within the averaging range is erased by the averaging process. Further, if the averaging range is increased to 3 dots ⁇ 3 dots, 4 dots ⁇ 4 dots, 5 dots ⁇ 5 dots, minute noise, texture, and the like can be erased.
- the edge portion remains as it is even after the averaging process, so that the correlation value R increases in the edge portion, and conversely in the other portions than the edge portion.
- the value R becomes smaller.
- the correlation value R has a value of 1 or a value close to 1 at the edge portion, and becomes a value abruptly smaller than the correlation value of the edge portion except for the edge portion. Therefore, the edge portion can be detected with very high accuracy by checking in advance the range in which the correlation value changes abruptly through experiments or the like and setting the threshold Th within this range.
- the edge identification circuit 36 detects the edge direction (edge extension direction) using the result of the difference calculation process in the horizontal direction and the result of the difference calculation process in the vertical direction, and the detection result is interpolated by the interpolation circuit. 22 for output.
- the value of the ratio a may vary due to the influence of noise included in the input image data. For this reason, it is not always necessary to calculate the angle ⁇ strictly for the edge direction, and any one of the five patterns shown in FIG. 20 or any of the nine patterns including an intermediate inclination of these five patterns. It only has to be classified. Therefore, in order to simplify the detection process of the edge direction and reduce the circuit scale required for the detection of the edge direction, the value of the ratio a does not necessarily have to be directly calculated. It may be determined which one of the five patterns shown in FIG.
- a 5 dot ⁇ 5 dot filter may be used to detect the inclination in the edge direction.
- the interpolation circuit 22 performs an interpolation process suitable for each characteristic on the edge part and the part other than the edge based on the edge detection result of the edge identification circuit 36.
- FIGS. 21A and 21B When the resolution of the input image data is upscaled twice in the horizontal direction and the vertical direction, two types of interpolation methods shown in FIGS. 21A and 21B can be considered.
- the value (luminance) of each pixel (reference point: ⁇ in the figure) in the input image data is left as it is, and pixels between these pixels are left as they are. This is a method of interpolating ( ⁇ mark in the figure).
- the second method is a method of interpolating 4 pixels ( ⁇ mark in the drawing) around each pixel (reference point: ⁇ mark in the drawing) in the input image data. is there.
- the pixel value (luminance) of each pixel in the input image data does not remain after the interpolation process.
- the present invention is not limited to this, and the second method can also be used.
- FIG. 22 is an explanatory diagram for explaining an interpolation method for an edge portion, and shows an example of interpolation for an edge portion in an oblique direction having a slope of 1.
- FIG. 22 is an explanatory diagram for explaining an interpolation method for an edge portion, and shows an example of interpolation for an edge portion in an oblique direction having a slope of 1.
- interpolation method shown in this figure, first, four pixels around the pixel to be interpolated are selected. It should be noted that the interpolation calculation can be facilitated by selecting four pixels so as to form each vertex of the parallelogram including a line segment parallel to the tilt direction.
- pixels B, E, F, and I are selected as peripheral pixels
- pixels D, E, H, and I are selected as peripheral pixels.
- the pixels adjacent in the edge direction are selected as peripheral pixels.
- an average value of values obtained by multiplying the pixel values of the surrounding four pixels by a coefficient set for each pixel according to the inclination may be used.
- z ((3 ⁇ E + F) / 4 + (H + 3 ⁇ I)) / 2
- y ((3 ⁇ E + D) / 4 + (3 ⁇ H + I) / 4 ) / 2
- x (B + I) / 2.
- a value corresponding to the above 5 pattern or 9 pattern that can be expressed by a block of 3 dots ⁇ 3 dots may be set in advance by approximation calculation or the like.
- a texture-oriented interpolation method in which the edge is not conspicuous is applied.
- Texture emphasis here refers to processing that is relatively resistant to noise, with emphasis on tone and hue maintenance and continuity of tone change.
- various conventionally known methods such as a bilinear method, a bicubic method, and a lanczos filter method (LANCZOS method) can be used.
- LANCZOS method when the upscale enlargement factor is constant (in this embodiment, the enlargement factor is double), the LANCZOS method is known as an excellent and simple filter and is suitable.
- each display area in the liquid crystal display panel 2 is controlled based on a plurality of divided image data obtained by dividing the image data for one screen according to the display area of the liquid crystal display panel 2. Then, the operation of each LED in the backlight unit 3 is controlled based on the image data for one screen that is not divided.
- the aspect ratio of the input image data and the aspect ratio of the liquid crystal display panel 2 are different, and there is no image non-display in which there is no corresponding input image data in the display screen of the liquid crystal display panel 2.
- the luminance of the LED corresponding to the non-image display region is set based on the average luminance (APL) at the end of the image display region.
- the aspect ratio of the input image data and the aspect ratio of the liquid crystal display panel 2 are different, and there is no image non-display in which there is no corresponding input image data in the display screen of the liquid crystal display panel 2.
- the display map generation circuit 16 determines mapping position in the display screen to display an image corresponding to the input image data, generates mapping image data (display map information), and this mapping image. The light emission brightness of each LED is set based on the data, and each divided image data is corrected.
- the display map generation circuit 16 has each position in each divided image data for displaying an image according to the input image data on the liquid crystal display panel 2 and each position in the image data to be used for controlling the LEDs that are not divided. Position information is generated as display map information so that and match each other. Thereby, even if the aspect ratio of the input image data is different from the aspect ratio of the liquid crystal display panel 2, an image corresponding to the input image data can be appropriately displayed. Moreover, the light emission state of each LED can be appropriately controlled according to the display position of the image corresponding to the input image data.
- the target pixel is an edge portion based on difference image data and averaged image data calculated based on 5 dot ⁇ 5 dot image data centered on the target pixel in the input image data.
- Judge whether or not. Therefore, when the input image data is divided into a plurality of regions, each of the divided image data obtained by simply dividing the input image data into four is divided into two boundary portions included in the image data of the divided regions adjacent to the divided image data.
- the edge portion in each divided image data is It can be detected with high accuracy.
- the number of pixels in the horizontal direction of the input image data is nx and the number of pixels in the vertical direction is ny
- the number of pixels in each divided area is set to nx / 2 + 2 in the horizontal direction and ny + 2 in the vertical direction.
- Edge detection and upscaling can be performed with high accuracy without considering the interaction with the region.
- the circuit scale can be reduced and the processing time can be shortened. That is, since it is not necessary to track the edge of the entire image as in the prior art, it is not necessary to pass the information of the entire image to each divided upscale circuit for edge determination. Therefore, edge detection can be performed with high accuracy in each upscale circuit without considering the interaction with other divided regions.
- each circuit (each block) constituting the control device 1 may be realized by software using a processor such as a CPU. That is, the control device 1 includes a CPU (central processing unit) that executes instructions of a control program that realizes each function, a ROM (read only memory) that stores the program, a RAM (random access memory) that expands the program, It is good also as a structure provided with memory
- an object of the present invention is to provide a recording medium in which a program code (execution format program, intermediate code program, source program) of a control program of the control device 1 which is software for realizing the above-described functions is recorded so as to be readable by a computer. This is achieved by supplying to the control device 1 and reading and executing the program code recorded on the recording medium by the computer (or CPU or MPU).
- a program code execution format program, intermediate code program, source program
- Examples of the recording medium include tapes such as magnetic tapes and cassette tapes, magnetic disks such as floppy (registered trademark) disks / hard disks, and disks including optical disks such as CD-ROM / MO / MD / DVD / CD-R.
- Card system such as IC card, IC card (including memory card) / optical card, or semiconductor memory system such as mask ROM / EPROM / EEPROM / flash ROM.
- control device 1 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network.
- the communication network is not particularly limited.
- the Internet intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication. A net or the like is available.
- the transmission medium constituting the communication network is not particularly limited.
- wired such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL line, etc.
- infrared rays such as IrDA and remote control, Bluetooth (Registered trademark), 802.11 wireless, HDR, mobile phone network, satellite line, terrestrial digital network, and the like can also be used.
- the present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.
- each circuit (each block) of the control device 1 may be realized by using software, may be configured by hardware logic, or hardware that performs a part of processing. And a calculation unit that executes software for controlling the hardware and performing the remaining processing may be used.
- the present invention can be applied to a control device and a control method for a liquid crystal display device having a backlight.
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Abstract
Description
2 液晶表示パネル
3 バックライトユニット
10 前処理回路(画像サイズ調整部、画像復元部)
11a 分割回路(液晶制御部)
11b 分割回路(液晶制御部)
12a~12d アップスケール回路(液晶制御部)
13 ダウンコンバータ(液晶制御部)
14a~14d 補正回路(液晶制御部)
15 液晶駆動回路(液晶制御部)
16 表示マップ生成回路(バックライト制御部)
17 LED解像度信号生成回路(バックライト制御部部)
18 輝度分布データ生成回路(バックライト制御部)
19 LED駆動回路(バックライト制御部)
21 エッジ検出回路
22 補間回路(補間処理部)
31 差分回路(差分演算部)
32 フィルタ回転回路
33 方向設定回路
34 平均化回路(平均化処理部)
35 相関演算回路(相関演算部)
36 エッジ識別回路
100 液晶表示装置
図1は、本実施形態にかかる液晶表示装置100の概略構成を示すブロック図である。この図に示すように、液晶表示装置100は、制御装置1、液晶表示パネル2、およびバックライトユニット3を備えている。
次に、制御装置1における処理の流れについて説明する。まず、制御装置1に対して、3840×2160ドットの画像データを左上、左下、右上、および右下の4つの領域に対応する1920ドット×1080ドットの4つの画像データP1,P2,P3、P4に分割した画像データが入力された場合の例について説明する。図10はこの場合の制御装置1における処理を概略的に示した説明図である。
次に、分割回路11bにおける画像データの分割方法、およびアップスケール回路12a~12dにおけるアップスケール処理について説明する。
Claims (9)
- 液晶表示パネルと、上記液晶表示パネルの背面側にマトリクス状に配置された複数の光源を有するバックライトユニットとを備えた液晶表示装置の動作を制御する液晶表示装置の制御装置であって、
入力画像データに基づいて上記液晶表示パネルの各画素を制御する液晶制御部と、
入力画像データに基づいて上記各光源の発光状態を制御するバックライト制御部と、
入力画像データの縦横比と上記液晶表示パネルの縦横比とが異なる場合に、上記入力画像データまたは入力画像データに所定の処理を施した画像データの周縁部にダミー画像データを付加して上記液晶表示パネルの縦横比に応じた縦横比を有するサイズ調整画像データを生成する画像サイズ調整部とを備え、
上記バックライト制御部は、
上記サイズ調整画像データを上記各光源の配置位置にそれぞれ対応する複数のブロックに分割し、
上記入力画像データに対応する画像の表示領域である画像表示領域に対応する光源については当該光源に対応するブロックに含まれる各画素の階調値のうちの最大値に基づいて発光輝度を決定し、
上記ダミー画像データに対応する画像の表示領域である画像非表示領域に対応する光源については、当該光源に対応するブロックに隣接する画像表示領域のブロックに含まれる各画素の平均輝度レベル、または当該光源に対応するブロックに隣接する画像表示領域のブロックをさらに分割して得られる複数の小ブロックのうち当該光源に対応する画像非表示領域のブロックに隣接する小ブロックの平均輝度レベルに基づいて発光輝度を決定することを特徴とする液晶表示装置の制御装置。 - 上記バックライト制御部は、
画像非表示領域に対応する光源のうち、当該光源に対応するブロックに隣接する画像表示領域のブロックがない光源について、当該光源に対応するブロックから最も近い画像表示領域のブロックに含まれる各画素の平均輝度レベル、またはこの画像表示領域のブロックをさらに分割して得られる複数の小ブロックのうち当該光源に対応する画像非表示領域側に位置する一部の小ブロックの平均輝度レベルに基づいて発光輝度を決定することを特徴とする請求項1に記載の液晶表示装置の制御装置。 - 上記バックライト制御部は、
画像表示領域から遠ざかる方向に画像非表示領域のブロックが複数並ぶ場合に、画像非表示領域のブロックに対応する各光源の発光輝度を、画像表示領域から距離が増すほど暗くなるように設定することを特徴とする請求項2に記載の液晶表示装置の制御装置。 - 上記各光源を上記バックライト制御部によって決定された発光輝度で発光させたときの各光源からの照射光による上記液晶表示パネルでの輝度分布データを生成する輝度分布データ生成部を備え、
上記液晶制御部は、上記入力画像データを上記輝度分布データに基づいて補正する補正部を備えており、上記補正部によって補正された画像データに基づいて上記液晶表示パネルの各画素を制御することを特徴とする請求項1から3のいずれか1項に記載の液晶表示装置の制御装置。 - 上記画像サイズ調整部は、
入力画像データに対応する画像が上記液晶表示パネルの略中央に表示されるように上記ダミー画像データを付加することを特徴とする請求項1から4のいずれか1項に記載の液晶表示装置の制御装置。 - 液晶表示パネルと、上記液晶表示パネルの背面側にマトリクス状に配置された複数の光源を有するバックライトユニットと、請求項1から5のいずれか1項に記載の制御装置とを備えていることを特徴とする液晶表示装置。
- 液晶表示パネルと、上記液晶表示パネルの背面側にマトリクス状に配置された複数の光源を有するバックライトユニットとを備えた液晶表示装置の動作を制御する液晶表示装置の制御方法であって、
入力画像データに基づいて上記液晶表示パネルの各画素を制御する液晶制御工程と、
入力画像データに基づいて上記各光源の発光状態を制御するバックライト制御工程と、
入力画像データの縦横比と上記液晶表示パネルの縦横比とが異なる場合に、上記入力画像データまたは入力画像データに所定の処理を施した画像データの周縁部にダミー画像データを付加して上記液晶表示パネルの縦横比に応じた縦横比を有するサイズ調整画像データを生成する画像サイズ調整工程とを含み、
上記バックライト制御工程は、
上記サイズ調整画像データを上記各光源の配置位置にそれぞれ対応する複数のブロックに分割する工程と、
上記入力画像データに対応する画像の表示領域である画像表示領域に対応する光源について、当該光源に対応するブロックに含まれる各画素の階調値のうちの最大値に基づいて発光輝度を決定する工程と、
上記ダミー画像データに対応する画像の表示領域である画像非表示領域に対応する光源について、当該光源に対応するブロックに隣接する画像表示領域のブロックに含まれる各画素の平均輝度レベル、または当該光源に対応するブロックに隣接する画像表示領域のブロックをさらに分割して得られる複数の小ブロックのうち当該光源に対応する画像非表示領域のブロックに隣接する各小ブロックの平均輝度レベルに基づいて発光輝度を決定する工程とを含むことを特徴とする液晶表示装置の制御方法。 - 請求項1から5のいずれか1項に記載の制御装置を動作させるプログラムであって、コンピュータを上記各部として機能させるためのプログラム。
- 請求項8に記載のプログラムを記録したコンピュータ読み取り可能な記録媒体。
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US20110037785A1 (en) | 2011-02-17 |
EP2290435A4 (en) | 2011-06-15 |
JPWO2009157224A1 (ja) | 2011-12-08 |
RU2471214C2 (ru) | 2012-12-27 |
US8917293B2 (en) | 2014-12-23 |
BRPI0914855A2 (pt) | 2019-09-24 |
EP2290435B1 (en) | 2019-05-22 |
CN102016699A (zh) | 2011-04-13 |
JP4806102B2 (ja) | 2011-11-02 |
RU2010144182A (ru) | 2012-08-10 |
CN102016699B (zh) | 2012-11-21 |
EP2290435A1 (en) | 2011-03-02 |
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