WO2006025120A1 - 画像表示装置および画像表示方法 - Google Patents
画像表示装置および画像表示方法 Download PDFInfo
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- WO2006025120A1 WO2006025120A1 PCT/JP2004/014625 JP2004014625W WO2006025120A1 WO 2006025120 A1 WO2006025120 A1 WO 2006025120A1 JP 2004014625 W JP2004014625 W JP 2004014625W WO 2006025120 A1 WO2006025120 A1 WO 2006025120A1
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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
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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
- 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
-
- 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
-
- 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
-
- 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
- G09G2320/066—Adjustment of display parameters for control of contrast
-
- 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
-
- 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
- G09G3/2003—Display of colours
Definitions
- the present invention relates to an image display device and an image display method, and in particular, adjusts brightness, image data, and the like according to an input image signal.
- An image display apparatus using a light-receiving light modulation element such as a liquid crystal panel improves the contrast of an image by adjusting the brightness of a knock light source according to an image signal.
- the contrast of the displayed image is adjusted by adjusting the brightness of the light source according to the change of the DC level so that the average brightness level of the displayed image does not change during the contrast adjustment. We are trying to improve.
- the present invention has been made to solve the above-described problems.
- An object is to provide a display method.
- An image display apparatus is an image display apparatus that includes light modulation means for inputting image data and forming an image by modulating light from a light source based on the image data.
- Color information detecting means for detecting the amount of chromatic color components of the image represented by the image data;
- Light source control data generating means for generating light source control data for controlling the luminance of the light source based on the amount of the chromatic color component
- Light source control means for controlling the luminance of the light source based on the light source control data. It is a thing.
- ⁇ 1 It is a block diagram showing a configuration of an embodiment of an image display device according to the present invention.
- FIG. 2 is a block diagram showing an internal configuration of a color information detection unit.
- FIG. 3 is a diagram showing an example of characteristics of luminance control data.
- FIG. 4 is a diagram for explaining the operation of the image display device according to the present invention.
- FIG. 5 is a flowchart showing processing in the image display apparatus according to the present invention.
- FIG. 6 is a block diagram illustrating an example of an internal configuration of a color information detection unit.
- FIG. 7 is a block diagram illustrating an example of an internal configuration of a color information detection unit.
- FIG. 8 is a block diagram illustrating an example of an internal configuration of a color information detection unit.
- FIG. 13 is a block diagram showing an internal configuration of a color information detection unit.
- FIG. 14 is a block diagram showing an internal configuration of a light source control data generation unit.
- FIG. 15 is a diagram showing an example of characteristics of luminance control data.
- FIG. 16 is a block diagram showing an internal configuration of a light source control data generation unit.
- ⁇ 17 It is a block diagram showing a configuration of an embodiment of an image display device according to the present invention.
- FIG. 18 is a block diagram illustrating an example of an internal configuration of a color information detection unit.
- FIG. 19 is a block diagram illustrating an example of an internal configuration of a light source control data generation unit.
- FIG. 20 is a block diagram showing a configuration of an embodiment of an image display device according to the present invention.
- FIG. 21 is a diagram showing an example of characteristics of image control data.
- FIG. 23 is a flowchart showing processing in the image display apparatus according to the present invention.
- 24 A block diagram showing a configuration of an embodiment of an image display device according to the present invention.
- FIG. 25 is a diagram illustrating an example of characteristics of image control data.
- FIG. 26 is a diagram for explaining the operation of the image display device according to the present invention.
- FIG. 27 is a flowchart showing processing in the image display apparatus according to the present invention.
- FIG. 28 is a block diagram showing a configuration of an embodiment of an image display device according to the present invention.
- FIG. 29 is a block diagram showing a configuration of an embodiment of an image display device according to the present invention.
- FIG. 30 is a block diagram showing a configuration of an embodiment of an image display device according to the present invention.
- FIG. 1 is a block diagram showing a configuration of an image display apparatus according to an embodiment of the present invention.
- the image display apparatus shown in FIG. 1 includes a reception unit 2, a color information detection unit 3, a light source control data generation unit 4, a light source control unit 5, a modulation unit 6, and a light source 7.
- the modulation unit 6 is composed of a display device that modulates light from the light source 7 to form an image. Specifically, it can be constituted by a liquid crystal panel, a projector using a liquid crystal panel, a projector using a reflective light modulation element (DMD) provided with a minute mirror element corresponding to a pixel, and the like.
- DMD reflective light modulation element
- the receiving unit 2 receives an image signal in a predetermined format used by a television or a computer via the input terminal 1, converts the received image signal into image data composed of RGB color data, and outputs the image data.
- the receiver 2 is configured with an A / D converter or the like when an analog image signal is input, and is configured with a predetermined demodulator when a modulated image signal is input. To do.
- the image data output from the reception unit 2 is input to the color information detection unit 3 and the modulation unit 6.
- the color information detection unit 3 detects the size of the chromatic color component of the input image data in units of one screen (one frame) and outputs it to the light source control data generation unit 4.
- FIG. 2 is a block diagram showing an internal configuration of the color information detection unit 3.
- the color information detection unit 3 shown in FIG. 2 includes a maximum value detection unit 8, a minimum value detection unit 9, a subtractor 10, and an average value calculation unit 11.
- the maximum value detector 8 detects the maximum value of the RGB color data for each pixel and outputs it as maximum value data.
- the minimum value detection unit 9 detects the value of the minimum of RGB color data for each pixel and outputs it as minimum value data. This minimum value data represents the amount of the achromatic component in the image data.
- the maximum value data and the minimum value data output from the maximum value detection unit 8 and the minimum value detection unit 9 are sent to the subtractor 10.
- the subtracter 10 reduces the chromaticity at each pixel by subtracting the minimum value data from the maximum value data power. Calculate the size of the color component.
- the chromatic color component is related to the saturation of the image data. Generally, the larger the chromatic color component, the higher the saturation of the image.
- the magnitude of the chromatic color component in each pixel output from the subtracter 10 is input to the average value calculation unit 11.
- the average value calculation unit 11 calculates the average value of chromatic color components of each pixel in one frame as chromatic color data CHR representing the amount of chromatic color components in the frame.
- the chromatic color data CHR calculated by the average value calculation unit 11 is sent to the light source control data generation unit 4.
- the light source control data generating unit 4 outputs light source control data k used when displaying the frame based on the chromatic color data CHR.
- the light source control data k is used when driving the light source 7 and is controlled so that the light source 7 becomes brighter as the value of the light source control data k increases.
- FIG. 3 is a diagram showing an example of the relationship between the chromatic color data CHR and the light source control data k.
- the chromatic color data CHR is compared with two preset threshold values SHO and SH1, and if it is smaller than the threshold value SHO, the light source control data k is 1, and if it is larger than the threshold value SH1, the light source control data k is X and SHO ⁇
- SHO threshold value
- SH1 the threshold value
- CHR ⁇ SHl the value is between 1 and x.
- the light source control data k is 1, the light source 7 is driven to have a standard luminance, and when it is larger than 1, the light source 7 is driven to have a higher luminance than the standard.
- the light source 7 is driven to have the maximum luminance.
- the amount of the chromatic color component is larger than the threshold value SH1
- the light source 7 is higher than the standard luminance, and may have any luminance as long as it has a luminance! /.
- the light source control data k generated by the light source control data generation unit 4 is sent to the light source control unit 5.
- the light source controller 5 controls the brightness of the light source 7 by adjusting the number of pulses (pulse frequency) or pulse width of the drive current or drive voltage of the light source 7 based on the light source control data k.
- the modulator 6 modulates the illumination light from the light source 7 based on the image data output from the receiver 2 to form a display image.
- FIG. 4 is a diagram for explaining the operation of the image display device shown in FIG. FIG. 4 (a) shows the color reproduction range of a conventional image display device, and FIG. 4 (b) shows the color reproduction range when the processing according to the present invention is performed.
- the luminance of the light source 7 is controlled based on the light source control data k generated based on the relationship shown in FIG. Therefore, when the amount of the chromatic color component is large, the luminance of the illumination light increases.
- the high saturation region is displayed brighter, so that the visual color reproduction range of the display image can be expanded.
- FIG. 5 is a flowchart showing the operation of the image display apparatus according to the embodiment of the present invention described above.
- image data is received (ST1), and the amount of chromatic color components for one frame is detected as color information of the received image data (ST2).
- light source control data is generated based on the detected color information (ST3), and the luminance of the light source is controlled based on the generated light source control data (ST4).
- the light of the light source whose luminance is adjusted based on the light source control data is optically modulated for each pixel to display an image (ST5).
- the image display device controls the luminance of the light source based on the amount (saturation) of the chromatic color component of the display image.
- the amount of chromatic components is V
- the luminance of the light source is set to an average level
- the amount of chromatic components is large
- the luminance of the light source is increased.
- the high saturation area can be displayed brighter and the visual color reproduction range can be expanded.
- by increasing the difference in visual brightness between a black and white image and a pure color image a display image with more vivid colors can be obtained.
- the color of the display image can be made clear without increasing the color purity of the color filter used in the modulation element, it is possible to suppress an increase in power consumption of the light source.
- the color information detection unit 3 determines the maximum and minimum values of RGB color data. Ability to average the difference to obtain the chromatic color data CHR.
- FIG. 6 is a block diagram showing another configuration of the color information detection unit 3.
- the color information detection unit 3 shown in FIG. 6 includes a frequency distribution calculation unit 12.
- the size of the chromatic color component of each pixel calculated by the subtracter 10 is input to the frequency distribution calculation unit 12.
- the frequency distribution calculation unit 12 obtains the frequency distribution of the chromatic color component in one frame, obtains the frequency distribution power chromatic color data CH R and outputs it to the light source control data generation unit 4.
- the maximum value of the chromatic color component, a value near the maximum value, or a value indicating the half of the frequency is obtained from the frequency distribution for one frame and used as chromatic color data.
- the light source control data k may be obtained based on the average value of the chromatic color data CHR in a plurality of frames. Also, by adding the average value (integral term) of chromatic color data CHR in multiple frames and chromatic color data (proportional term) for one frame at an arbitrary ratio, a time constant is provided for the change in light source control data k. By providing such a time constant, it is possible to prevent the brightness of the light source 7 from changing abruptly and make the brightness change smoother.
- the chromatic color data CHR may be calculated based on pixels in a partial area in the display image.
- FIG. 7 is a block diagram showing another configuration of the color information detection unit 3.
- the color information detection unit 3 shown in FIG. 7 includes frequency distribution calculation units 37 and 38 and a frequency distribution comparison unit 39.
- the maximum value data and the minimum value data output from the maximum value detection unit 8 and the minimum value detection unit 9 are sent to the frequency distribution calculation units 37 and 38, respectively.
- the frequency distribution calculation units 37 and 38 obtain the frequency distribution for one frame of the maximum value data and the minimum value data, respectively.
- the frequency distribution of the maximum value data and the minimum value data calculated by the frequency distribution calculation units 37 and 38 is sent to the frequency distribution comparison unit 39.
- the amount of the chromatic color component for one frame is determined when the frequency distribution of the maximum value data is concentrated in the high gradation region and the frequency distribution of the minimum value data is concentrated in the low gradation region.
- the number increases when the frequency distribution of the maximum value data and the frequency distribution of the minimum value data are the same. Therefore, it is based on a comparison between the frequency distribution of the maximum value data and the frequency distribution of the minimum value data. Therefore, the amount of chromatic color components for one frame can be obtained.
- the frequency distribution comparison unit 39 obtains the amount of the chromatic color component in one frame by comparing the frequency distribution of the maximum value data and the minimum value data, and outputs the chromatic color data CHR.
- the cumulative frequency of the maximum value data is obtained from the high gradation side, and this cumulative frequency is compared with a preset first threshold value, and the gradation number exceeding the threshold value is obtained as the maximum gradation data.
- the cumulative frequency of the minimum value data is also calculated for the low gradation side force, and this cumulative frequency is compared with the second threshold value, and the gray level number exceeding the threshold value is determined as the minimum gray level data of the minimum value data.
- the difference between the maximum gray level data and the minimum gray level data may be used as the chromatic color data CHR. Note that the maximum gradation data and the minimum gradation data may be directly obtained without using the threshold value.
- the difference power between the average value of the maximum value data calculated using the frequency distribution of the maximum value data and the average value of the minimum value data calculated using the frequency distribution of the minimum value data Find the amount of ingredients.
- FIG. 8 is a block diagram showing another configuration of the color information detection unit 3.
- the color information detection unit 3 shown in FIG. 8 includes average value calculation units 40 and 41 and an average value comparison unit 42.
- the average value calculation unit 40 obtains an average value in one frame of the maximum value data output from the maximum value detection unit 8.
- the average value calculation unit 41 obtains an average value in one frame of the minimum value data output from the minimum value detection unit 9.
- the average value of the maximum value data and the minimum value data is sent to the average value comparison unit 42.
- the average value comparison unit 42 calculates the difference between the average values of the maximum value data and the minimum value data to obtain the amount of chromatic color components in one frame, and outputs chromatic color data CHR.
- FIG. 9 is a block diagram showing another configuration of the image display device shown in FIG.
- the image display device shown in FIG. 9 further includes an area signal generator 13.
- the area signal generation unit 13 generates an area designation signal s for designating a predetermined area of the display image based on the vertical synchronization signal and horizontal synchronization signal of the image data, and outputs the area designation signal s to the color information detection unit 14.
- the color information detection unit 14 generates chromatic color data CHR based on the amount of chromatic color components in the region specified by the region specifying signal s. Other operations are the same as those of the image display device shown in FIG.
- chromatic color data CHR in a specific region based on the region designation signal s.
- more appropriate luminance adjustment can be performed according to the amount of the chromatic color component in the region of interest of the viewer such as the center of the screen.
- Brightness control can be performed when displaying a movie stored on a DVD or the like.
- the area signal generation unit 13 may detect an area representing a specific luminance or a specific color and output a signal specifying the detected area as the area specifying signal s.
- FIG. 10 is a block diagram showing another configuration of the image display device shown in FIG.
- the image display apparatus shown in FIG. 10 further includes an OSD signal receiving unit 16 and an image composition unit 17.
- the OSD signal receiving unit 13 receives a character generated outside the image display device or an image signal composing a graph status (hereinafter referred to as an OSD signal), and character information represented by the received OSD signal is stored in the image combining unit 17.
- an area designation signal s indicating an area other than the part where the character image is displayed is generated and output to the color information detection unit 14.
- the image composition unit 17 synthesizes character information represented by the OSD signal with the image data output from the reception unit 2 to generate a new image.
- the R, G, B color data representing the image generated by the image composition unit 17 is sent to the color information detection unit 14 and the modulation unit 6.
- the color information detection unit 14 detects the amount of the chromatic color component in the region other than the display portion of the character information based on the region designation signal output from the OSD signal reception unit 16. Other operations are the same as those of the image display device in FIG.
- the brightness of the light source 7 is adjusted appropriately without being affected by the character information superimposed on the display image by the OSD signal. can do.
- FIG. 11 is a diagram showing another configuration of the image display device shown in FIG.
- the image display device shown in FIG. 11 includes an OSD signal generator 18 that generates an OSD signal.
- the OSD signal generator 18 generates an OSD signal representing symbols, characters, etc. displayed during channel display or remote control operation, and outputs the OSD signal to the image compositing unit 17 as well as the symbols represented by the OSD signal,
- An area designation signal s indicating an area other than the character display area is generated and output to the color information detection unit 14.
- Other operations are the same as those of the image display apparatus shown in FIG.
- FIG. 12 is a block diagram showing another embodiment of the image display device according to the present invention.
- FIG. 13 is a block diagram showing the internal configuration of the color information detection unit 19 in the image display apparatus shown in FIG.
- the color information detection unit 19 shown in FIG. 13 includes a minimum value detection unit 9, subtractors 21, 22, 23, and average value calculation units 24, 25, 26.
- the subtracters 21, 22, and 23 receive G, R, and B color data that constitute image data, respectively, and the minimum value detection unit 9 receives all RGB color data.
- the minimum value detection unit 9 detects the minimum color data among the RGB color data, and outputs the minimum color data to the subtracters 21, 22, and 23.
- the subtractor 21 also subtracts the minimum value data from the color data G force, and outputs the subtraction value to the average value calculation unit 24 as data representing the amount of the green chromatic color component.
- the subtractor 22 subtracts the minimum value data from the color data R, and outputs the subtraction value to the average value calculation unit 25 as data representing the amount of the red chromatic color component.
- the subtracter 23 subtracts the minimum value data from the color data B, and outputs the subtraction value to the average value calculation unit 26 as data representing the amount of the chromatic color component of blue.
- data representing the amount of red, green, and blue chromatic components in the unit pixel is zero.
- the average value calculation units 24, 25, and 26 calculate the average value of the chromatic color components of green, red, and blue for each pixel in one frame, and the chromatic color data Ga, Ra , Ba and output to the light source control data generation unit 20 in the subsequent stage.
- FIG. 14 is a block diagram showing an internal configuration of the light source control data generation unit 20.
- the light source control data generation unit 20 shown in FIG. 14 includes data generation units 27, 28, 29, and a data selection unit 30.
- the data generators 27, 28, 29 generate light source control data Gk, Rk, Bk based on the chromatic color data Ga, Ra, Ba.
- FIG. 15 is a diagram showing the relationship between the chromatic color data Ga, Ra, Ba and the light source control data Gk, Rk, Bk.
- the chromatic color data Gk, Rk, and Bk for green, red, and blue are respectively compared with two preset threshold values SHgO, SHgl, SHrO, SHrl, and SHbO, SHbl. These thresholds are set so that SHgO> SHrO> SHbO, SHgl> SHrl> SHbl.
- the light source control data Gk when the chromatic color data Gk is smaller than the threshold value SHgO, the light source control data Gk is 1, and when it is larger than the threshold value SHgl, it is xl.
- the chromatic color data Gk force HgO ⁇ Gk ⁇ SHgl the light source control data Gk is a value between 1 and xl.
- the chromatic color data Rk and Bk force when the chromatic color data Rk and Bk force are smaller than the S threshold SHrO and SHbO, the light source control data Rk and Bk are 1, respectively, and larger than the thresholds SHrl and SHbl.
- the light source control data Rk and Bk are x2 and x3, respectively.
- the light source control data Rk, Bk are values between 1 and x2, 1—x3, respectively.
- the values xl, x2, and x3 of the light source control data are set to satisfy xl ⁇ x2 ⁇ x3.
- the light source control data Gk, Rk, Bk are input to the data selection unit 30.
- the data selection unit 30 selects the maximum data among the light source control data Gk, Rk, and Bk and outputs the selected data to the light source control unit 5 at the subsequent stage.
- the light source control unit 5 controls the luminance of the light source 7 based on the selected light source control data.
- the human visual sensitivity to brightness is G> R> B
- the maximum of the light source IJ data Gk, Rk, Bk shown in Fig. 15 is large / xl. J
- the relationship can be set so that xl ⁇ x2 ⁇ x3.
- SHgO> SHrO> SHbO, SHgl> SHrl> SHbl it is possible to adjust the brightness appropriately considering the visual sensitivity.
- the characteristics of the light source control data Gk, Rk, and Bk shown in FIG. 15 are examples, and can be set as appropriate.
- the maximum value x3 of the light source control data Bk is an arbitrary value as long as the luminance of the light source 7 is higher than the standard.
- FIG. 16 is a block diagram showing another configuration of the light source control data generation unit 20 in the image display apparatus shown in FIG.
- the light source control data generation unit 20 shown in FIG. 16 includes a maximum value detection unit 31. Other configurations are the same as the light source control data generation unit 20 shown in FIG. 14.
- the maximum value detection unit 31 selects the largest data among the chromatic color data Ga, Ra, Ba calculated by the color information detection unit 19. Then, a light source control data selection signal for designating luminance control data corresponding to the selected chromatic color data is generated and output to the data selection unit 32.
- the data selection unit 32 is based on the light source control data selection signal output from the maximum value detection unit 31.
- the light source control data Gk, Rk, and Bk specified are selected and output.
- the amount of the chromatic component of each color that is actually detected can be increased. Based on this, the luminance of the light source 7 is adjusted, so that the light source control data Gk, Rk, and Bk are accurately selected. Further, the degree of freedom in setting the light source control data is increased.
- FIG. 17 is a block diagram showing another embodiment of the image display device according to the present invention.
- FIG. 18 is a block diagram showing the internal configuration of the color information detection unit 33 in the image display device shown in FIG.
- the color information detection unit 33 shown in FIG. 18 includes a maximum value detection unit 8, a minimum value detection unit 9, a subtractor 10, an average value calculation unit 11, and a frequency distribution calculation unit 35.
- RGB value data constituting image data is input to maximum value detection unit 8, minimum value detection unit 9, and frequency distribution calculation unit 35.
- the maximum value detection unit 8 detects the maximum value of the RGB color data constituting the image data for each pixel and outputs it as maximum value data.
- the minimum value detection unit 9 detects the smallest value of the RGB color data for each pixel and outputs it as minimum value data.
- the subtracter 10 subtracts the minimum value data from the maximum value data, and calculates the size of the chromatic color component in each pixel.
- the average value calculation unit 11 calculates the average value of the chromatic color components of each pixel in one frame, and calculates it as chromatic color data CHR representing the amount of the chromatic color component in the frame.
- the chromatic color data CHR calculated by the average value calculator 11 is sent to the light source control data generator 34.
- the frequency distribution calculation unit 35 calculates the frequency distribution (histogram) of each RGB color data, and sends the frequency distribution data HD indicating the calculated frequency distribution to the light source control data generation unit 34.
- FIG. 19 is a block diagram showing an internal configuration of the light source control data generation unit 34.
- the light source control data generation unit 34 shown in FIG. 19 includes data generation units 27, 28, 29 and a data processing unit 36.
- the chromatic color data CHR output by the color information detection unit 33 is input to the data generation units 27, 28 and 29, and the frequency distribution data HD is input to the data force check unit 36.
- the data generation units 27, 28, and 29 output three types of light source control data Gk, Rk, and Bk preset for the chromatic color data CHR, and send them to the data force control unit 36.
- the characteristics of the light source control data Rk, Gk, Bk can be set based on the relationship shown in FIG.
- the data force checking unit 36 selects or checks the light source control data Gk, Rk, Bk based on the frequency distribution data HD indicating the frequency distribution of each RGB color data, thereby generating the light source control data. Generate. Specifically, colors with many chromatic components, such as R, G, B, which are the three primary colors of light, and C, M, Y, which are complementary colors, are obtained, and light source control data is obtained based on these ratios. Select one of Gk, Rk, and Bk for output, or select two light source control data, and multiply the selected light source control data by a coefficient corresponding to the ratio of the chromatic component of each color. Add and output. For example, if the frequency distribution power 3 ⁇ 4 and 0 indicate high saturation, light source control data Gk and Rk are selected, and light source control is performed by multiplying and calculating Gk and Rk according to the distribution status of the frequency distribution Calculate data k.
- the light source control data k generated by the data processing unit 36 is sent to the light source control unit 5.
- the light source control unit 5 controls the luminance of the light source 7 based on the light source control data.
- the luminance of the light source 7 is set to be different for each kind of chromatic color component, for example, three primary colors of light such as R, G, B, C, M, and Y and their complementary colors. Therefore, it is possible to set an appropriate brightness for each chromatic color component ratio of each screen.
- the data processing unit 36 selects or checks the light source control data Gk, Rk, Bk based on the frequency distribution of R, G, B.
- the present invention is not limited to this, and the light source control data k may be obtained by performing calculations based on the values of the light source control data Gk, Rk, and Bk. For example, a coefficient set for each light source control data according to the frequency distribution data HD may be added to the light source control data Gk, Rk, Bk.
- FIG. 20 is a block diagram showing another embodiment of the image display device according to the present invention.
- the image display apparatus shown in FIG. 20 includes a receiving unit 2, a light source control data generation unit 4, a color information detection unit 43, an image control data generation unit 44, an image control unit 45, a light source control unit 5, a modulation unit 6, and a light source. 7 is provided.
- the image data output from the reception unit 2 is input to the color information detection unit 43 and the image control unit 45.
- the color information detection unit 43 detects the amount of chromatic color components in one frame of image data. And the amount of the detected chromatic color component is sent to the light source control data generation unit 4 as chromatic color data CHR.
- the light source control data generation unit 4 outputs light source control data k based on the chromatic color data CHR.
- the light source control data k is sent to the light source control unit 5 and the image control data generation unit 44.
- the light source control unit 5 controls the luminance of the light source 7 based on the light source control data k.
- the color information detection unit 43 detects the amount of the chromatic color component in each pixel of one frame, and the chromatic color data CHRp representing the amount of the chromatic color component in each detected pixel is the image control data generation unit. Output to 44. Based on the chromatic color data CHRp and the light source control data k, the image control data generation unit 44 cancels the luminance change of the light source 7 controlled based on the light source control data k for pixels with a small amount of chromatic color components. Such image control data j is generated for each pixel.
- FIG. 21 is a diagram showing the relationship between the chromatic color data CHRp and the image control data j.
- the chromatic color data CHRp is compared with two preset threshold values SH2 and SH3. If the chromatic color data CHRp is smaller than the threshold value SH2, the light source control data j is y. j is 1, and when SH2 ⁇ CHRp ⁇ SH3, the value is between y ⁇ 1.
- the value y of the control data is set so as to cancel the brightness change of the light source 7 controlled based on the light source control data k. That is, the value y of the control data changes depending on the value of the light source control data k.
- the image control data j is sent to the image control unit 45.
- the image control unit 45 corrects the tone of each pixel of the image specified by the image data output from the receiving unit 2 based on the image control data j, and outputs the corrected tone to the modulating unit 6.
- the gradation of each pixel is adjusted so as to cancel the brightness of the light source 7 controlled based on the light source control data k when the amount of the chromatic color component in the pixel is small.
- the image data adjustment by the image control unit 45 may be performed on the RGB image data. However, the image data may be converted into RGB image data after converting the luminance data and the color data into force data. Good.
- the modulation unit 6 modulates the illumination light from the light source 7 based on the image data adjusted by the image control unit 45 to form an image.
- FIG. 22 is a diagram showing a color reproduction range of the image display device according to the present embodiment shown in FIG.
- the broken line shown in FIG. 22 indicates the color reproduction range of the conventional image display device.
- the luminance of the light source 7 is increased when the amount of the chromatic color component in one frame is large, and the brightness of the light source 7 is canceled for the pixel with the small amount of chromatic color component.
- the gradation of the image data is corrected. This makes it possible to display more vivid colors by increasing the brightness of pixels with high saturation V and low brightness, while reducing the brightness of pixels with low saturation and low saturation. As shown, a wider color reproduction range can be realized.
- FIG. 23 is a diagram showing a flow chart for explaining the operation of the image display apparatus according to the present embodiment.
- image data is received (ST11), and the amount of chromatic color components in each pixel in one frame is detected as color information of the received image data (ST12).
- light source control data is generated based on the detected color information (ST13), and the luminance of the light source is controlled based on the generated light source control data (ST14).
- image control data for correcting the gradation of each pixel in the image data based on the amount of the chromatic color component of each pixel detected in ST12 and the light source control data generated in ST13 Specifically, image control data for canceling the brightness of the light source controlled by the light source control data is generated for a pixel having a small amount of chromatic color component (ST15).
- the image display device when the amount of chromatic color components in one frame is large, the luminance of light source 7 is increased and the amount of chromatic color components is increased. For pixels with few pixels, the gradation of the image data is corrected so that the brightness of the light source 7 is canceled.For pixels with high saturation, the brightness is increased to display more vividly, and for pixels with low saturation, By reducing the brightness, a wider color reproduction range can be realized as shown by the solid line in FIG.
- the color of the display image can be made clear without increasing the color purity of the color filter used in the modulation element, it is possible to suppress an increase in power consumption of the light source.
- FIG. 24 is a block diagram showing another embodiment of the image display device according to the present invention.
- the image display device shown in FIG. 24 includes a reception unit 2, a color information detection unit 3, a light source control data generation unit 4, an image control data generation unit 47, an image control unit 48, a light source control unit 5, a modulation unit 6, and a light source 7 It has.
- the image data output from the reception unit 2 is input to the color information detection unit 3, the luminance information detection unit 46, and the image control unit 48.
- the color information detection unit 3 detects the amount of the chromatic color component in one frame of the image data, and sends the detected amount of the chromatic color component to the light source control data generation unit 4 as the chromatic color data CHR.
- the light source control data generation unit 4 outputs light source control data k based on the chromatic color data CHR.
- the light source control data k is sent to the light source control unit 5 and the image control data generation unit 47.
- the light source control unit 5 controls the luminance of the light source 7 based on the light source control data k.
- the luminance information detection unit 46 detects the amount of luminance component in each pixel of one frame, and outputs luminance data Yp representing the amount of detected luminance component of each pixel to the image control data generation unit 47. Based on the luminance data Yp and the light source control data k, the image control data generation unit 47 generates image control data i that cancels the luminance change of the light source 7 controlled by the light source control data, for pixels with a small amount of luminance component. To do.
- FIG. 25 is a diagram showing the relationship between the luminance data Yp and the image control data i.
- the luminance data Yp is compared with two preset threshold values SH4 and SH5.
- the light source control data i is z
- the luminance data Yp is larger than the threshold value SH5
- the light source control data is obtained.
- I is 1, and when SH4 ⁇ Yp ⁇ SH5, the value is between z ⁇ 1.
- the value z of the control data is set so as to cancel the luminance change of the light source 7 controlled based on the light source control data k. That is, the control data value z varies depending on the light source control data k value. To do.
- the image control data i is sent to the image control unit 48.
- the image control unit 48 adjusts the gradation of each pixel in the image data output from the receiving unit 2 based on the image control data i, and outputs it to the modulation unit 6.
- the gradation of each pixel is adjusted so as to cancel the luminance change of the light source 7 controlled based on the light source control data k when the amount of the luminance component in the pixel is small.
- the image data adjustment by the image control unit 48 may be performed on the RGB image data. However, the image data may be converted into the RGB image data after adjustment is performed by converting the luminance data and the color data. .
- the modulation unit 6 modulates the illumination light from the light source 7 based on the image data adjusted by the image control unit 48 to form an image.
- FIG. 26 is a diagram showing a color reproduction range of the image display device according to the present embodiment.
- the broken line in Fig. 26 shows the color reproduction range of the conventional image display device.
- the luminance of the light source 7 is increased when the amount of luminance component in one frame is large, and the brightness of the light source 7 is canceled for pixels with a small amount of luminance component.
- the gradation of the image data is corrected so that the pixels with higher saturation and higher brightness can be displayed more vividly and the brightness of dark pixels can be reduced.
- the solid line in Fig. 22 a wide color reproduction range can be realized.
- FIG. 27 is a diagram showing a flowchart for explaining the operation of the image display device according to the embodiment of the present invention.
- image data is received (ST21), and the amount of chromatic color components in each pixel in one frame is detected as color information of the received image data (ST22).
- light source control data is generated based on the detected color information (ST23), and the brightness of the light source is controlled based on the generated light source control data (ST24).
- the amount of luminance component of the image data received in ST21 is detected (ST25). Based on the detected amount of luminance component of each pixel and the light source control data generated in ST23! /, Image control data for correcting the gradation of each pixel in the image data, and more specifically, an image for canceling the brightness of the light source controlled by the light source control data for pixels with a small amount of luminance component Control data is generated (ST26).
- the image display device increases the luminance of the light source 7 when the amount of the luminance component in one frame is large, and the light source for the pixel with the small amount of luminance component. Since the gradation of the image data is corrected so as to cancel out the brightness of 7, the brightness of pixels with high saturation is increased by increasing the brightness, and the brightness of dark pixels is suppressed by reducing the brightness. A wide color reproduction range can be realized as shown by the solid line in FIG. In particular, it is possible to improve the contrast of an image with many chromatic color components by suppressing the increase in brightness (black float) in dark pixels.
- FIG. 28 is a block diagram showing another embodiment of the image display device according to the present invention.
- the image display apparatus shown in FIG. 28 includes a reception unit 2, a color information detection unit 3, a light source control data generation unit 4, a light source control unit 5, modulation units 6, 49, and a light source 7.
- the image data output from the reception unit 2 is input to the color information detection unit 3 and the modulation unit 6.
- the color information detection unit 3 detects the amount of the chromatic color component in one frame of the image data, and sends the detected amount of the chromatic color component to the light source control data generation unit 4 as the chromatic color data CHR.
- the light source control data generation unit 4 outputs light source control data k based on the chromatic color data CHR.
- the light source control data k is sent to the light source control unit 5.
- the light source control unit 5 generates a control signal for the modulation unit 49 based on the light source control data k.
- the modulation unit 49 controls the luminance of the illumination light incident on the modulation unit 6 by modulating the light emitted from the light source 7 based on the control signal generated by the light source control unit 5.
- the modulation unit 6 forms an image by modulating the illumination light whose luminance has been adjusted by the modulation unit 49 based on the image data output from the reception unit 2.
- the luminance adjustment of the light source 7 is performed by the modulation unit 49. Therefore, the luminance adjustment according to the chromatic color component of the image is performed using a light source with a constant output luminance. It can be carried out.
- the luminance of the illumination light incident on the modulation unit 6 is set to an average level, and when the amount of the chromatic color component is large, the luminance of the illumination light is increased.
- the high saturation area can be displayed brighter and the visual color reproduction range can be expanded.
- a display image with more vivid colors can be obtained.
- the color of the display image can be sharpened without increasing the color purity of the color filter used in the modulation element, it is possible to suppress an increase in power consumption of the light source.
- FIG. 29 is a block diagram showing another embodiment of the image display device according to the present invention.
- the image display apparatus shown in FIG. 29 includes a reception unit 2, a color information detection unit 3, a display control data generation unit 51, a display control unit 52, and a display unit 50.
- As the display unit 50 plasma 'display panel (PDP), CRT, organic EL display, field' emission 'display (FED), LED display and! /, Self-luminous display device can be used. .
- the image data output from the receiving unit 2 is input to the color information detecting unit 3 and the display unit 50.
- the color information detection unit 3 detects the amount of the chromatic color component in one frame of the image data, and sends the detected amount of the chromatic color component to the display control data generation unit 51 as the chromatic color data CHR.
- the display control data generation unit 51 generates display control data for controlling the overall brightness (average luminance level) of the display unit 50 based on the chromatic color data CHR, and sends the display control data to the display control data generation unit 51. This display control data is generated so as to increase the brightness of the entire display unit 50 for an image with many chromatic color components in one frame.
- the display control unit 52 adjusts the brightness of the entire display screen by controlling the amount of voltage or current supplied to the display unit 50 based on the display control data.
- a display device that performs pulse control such as PDP
- the brightness of the screen is adjusted by adjusting the voltage or current pulse number (pulse frequency) and the pulse width ratio of the display unit 50.
- the display unit 50 displays an image based on the image data output from the receiving unit 2. The image is displayed.
- the brightness of the entire display unit 50 is adjusted based on the amount of chromatic color components for one frame.
- the color reproduction range of can be expanded. Further, by increasing the difference in visual brightness between a black and white image and a pure color image, a display image with more vivid colors can be obtained.
- FIG. 30 is a block diagram showing another embodiment of the image display device according to the present invention.
- the image display apparatus shown in FIG. 30 includes a reception unit 2, a color information detection unit 53, an image control data generation unit 54, an image control unit 55, and a display unit 56.
- the display unit 56 any display device such as the liquid crystal panel, plasma 'display' panel, or organic EL display exemplified in the first and seventh embodiments can be used.
- the image data output from the reception unit 2 is input to the color information detection unit 53 and the image control unit 55.
- the color information detection unit 53 detects the amount of chromatic color components in one frame of image data and the amount of chromatic color components of each pixel, and outputs them to the image control data generation unit 54.
- the image control data generation unit 54 generates image control data for correcting the gradation of the image data based on the amount of the chromatic color component detected by the color information detection unit 53. Specifically, when the amount of chromatic color components in one frame is large, image control data for correcting the gradation of image data is generated so that pixels with a large amount of chromatic color components are displayed brighter. .
- the image control data generated by the image control data generation unit 54 is sent to the image control unit 55.
- the image control unit 55 corrects the gradation of each pixel of the image data output from the receiving unit 2 based on the image control data.
- the display unit 56 displays an image based on the image data whose gradation has been corrected by the image control unit 55.
- the operation of other configurations is the same as that of the first embodiment.
- the image display device when the amount of chromatic color components in one frame is large, the image is displayed so that the amount of chromatic color components is large and the pixels are displayed brighter. Since the gradation of the data is corrected, as in the first embodiment, the brightness of the high saturation area is By increasing the degree, it is possible to widen the visual color reproduction range and obtain a vivid display image. Further, by increasing the difference in visual brightness between a black and white image and a pure color image, a display image with more vivid colors can be obtained.
- the image display device and the image display method according to the present invention adjust the brightness of an image based on the amount of chromatic color components, so that a brightly displayed color is displayed with a high saturation color. An image can be obtained.
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2005
- 2005-08-08 US US11/631,934 patent/US8243104B2/en active Active
- 2005-08-08 KR KR1020077004849A patent/KR100854219B1/ko active IP Right Grant
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- 2005-08-08 JP JP2006531626A patent/JP3922306B2/ja active Active
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WO2006025190A1 (ja) | 2006-03-09 |
TW200617840A (en) | 2006-06-01 |
KR20070053723A (ko) | 2007-05-25 |
JP3922306B2 (ja) | 2007-05-30 |
US20070247391A1 (en) | 2007-10-25 |
TWI308311B (en) | 2009-04-01 |
JPWO2006025190A1 (ja) | 2008-05-08 |
US8243104B2 (en) | 2012-08-14 |
KR100854219B1 (ko) | 2008-08-25 |
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