Source: https://patents.google.com/patent/WO2009101727A1/en
Timestamp: 2018-05-24 23:46:53
Document Index: 202400819

Matched Legal Cases: ['art 12', 'art 13', 'art 13', 'art 15', 'art 15', 'art 12', 'art 12', 'art 13', 'art 15', 'art 13', 'art 13', 'art 19', 'art 19', 'art 15', 'art 19', 'art 19', 'art 21', 'art 9', 'art 9', 'art 13', 'art 21', 'art 15', 'art 15', 'art 15', 'art 15', 'art 22', 'art 22', 'art 22', 'art 22', 'art 22', 'art 22', 'art 26', 'art 26', 'art 27', 'art 13', 'art) 26', 'art 24', 'art) 15', 'art 30', 'art) 15', 'art 32', 'art 30', 'art 30', 'art) 15', 'art 32', 'art) 15', 'art 15', 'art 30', 'art) 15', 'art 15']

WO2009101727A1 - Display device - Google Patents
WO2009101727A1
WO2009101727A1 PCT/JP2008/068304 JP2008068304W WO2009101727A1 WO 2009101727 A1 WO2009101727 A1 WO 2009101727A1 JP 2008068304 W JP2008068304 W JP 2008068304W WO 2009101727 A1 WO2009101727 A1 WO 2009101727A1
PCT/JP2008/068304
A liquid crystal display device with high color reproduction ability when an area active back light is driven is provided. The liquid crystal display device (1) uses video signal input from the outside to control to drive a liquid crystal panel (2) and a back light device (3). A plurality of illuminating areas (Ha) are set on a LED substrate (7) for a plurality of display areas provided on the liquid crystal panel (2) in the back light device (3), and area active back light drive takes place to drive to light up light-emitting diodes (8) in the unit of the illuminating areas. When a back light data processing part (lighting control part) (15) determines that a brightness signal value instructed for a blue light-emitting diode (a light source of a predetermined color) (8b) is larger than a brightness signal value instructed for other light-emitting diodes (8r, 8g) and also determines that a value of the brightness signal value instructed for the blue light-emitting diode (8b) multiplied by a predetermined ratio is equal to or larger than the brightness signal value instructed for the other light-emitting diodes (8r, 8g), it lights up the other diodes (8r, 8g) using the brightness signal value instructed for the blue diode (8b).
The present invention relates to a display device, particularly to a non-luminous display device such as a liquid crystal display device.
Recently, for example, a liquid crystal display device, thin in comparison to cathode ray tube of the conventional, as a flat panel display having features such as light weight, LCD TVs, monitors, and is widely used in mobile phones. Such liquid crystal display device, includes a backlight device that emits light, and a liquid crystal panel that displays a desired image by serving a shutter to the light from a light source provided in the backlight device there.
Further, in the backlight device, but is classified roughly into a direct type and an edge light type depending on how the arrangement of the light source with respect to the liquid crystal panel, a liquid crystal display device having a liquid crystal panel of 20 inches or more, rather than an edge light type high brightness and size easily direct backlight device achieving are commonly used. Further, in the direct type backlight device, a cold cathode fluorescent tubes of a plurality of which are interposed diffusing plate is disposed to face the liquid crystal panel (CCFL: Cold Cathode Fluorescent Lamp) having a lamp (discharge tube) such as It was the mainstream. However, such a discharge tube, includes a mercury, has been difficult perform a protective recycling and the environment of the discharge tube to be discarded. Therefore, mercury-free light-emitting diode (LED: Light Emitting Diode) backlight apparatus using the light source have been developed and put into practical use.
Further, in a conventional liquid crystal display device using the LED backlight device as described above, for example, Japanese Patent as described in 2006-133721 JP, red (R), green (G), and blue ( and the LED unit is used consisting of three colors LED that emits the color light of B), in this conventional liquid crystal display device, the plurality of LED units are arrayed in a matrix. Further, in this conventional liquid crystal display device, the LED unit, and three green LED, respectively enhance color mixing of the white light by using two red and blue LED, color unevenness, luminance unevenness It has been considered can be suppressed.
Further, in a conventional liquid crystal display device using the LED backlight device as described above, for example, as described in JP 2005-338857, as well as divide the liquid crystal panel into a plurality of areas (areas) in accordance with the divided areas, it is also provided that selectively area active drive in which a drive unit for controlling the brightness of the generated light is configured to be implemented by LED. Then, in this conventional liquid crystal display device, as compared with the backlight device using cold cathode fluorescent tube, and improving the image quality of the liquid crystal panel, and has been possible to reduce power consumption.
Further, in a conventional liquid crystal display device corresponding to the area active drive such as described above, for example, as described in Japanese Patent No. 3523170, the RGB input signal and a backlight brightness level determined from an input signal value the calculates the tristimulus values ​​XYZ based obtains a corrected XYZ was corrected by the correction value and the color correction values ​​resulting from the tristimulus values ​​XYZ in backlight illumination distribution. Furthermore, in this conventional liquid crystal display device, (X, Y, Z) from (R, G, B) by performing an inverse transformation to the signal level R "G" B "to the driver of the liquid crystal panel it then. have obtained been proposed for obtaining, in this conventional liquid crystal display device, by using the XYZ matrix as described above, was made to be eliminated chromaticity shift due to the difference in color of light emitted by the light source.
Although generally uses a LED in the backlight device, for example, Japanese LED as shown in 2006-106437 Patent Publication can enlarge the color reproduction range than in the CCFL, in nature, such as Pointer's Color and as an almost comprehensive a means of existing color.
Incidentally, in the conventional liquid crystal display device as described above, when it is operably configured area active drive, generally using RGB LED in a backlight device, the white expressed by adjusting the luminance balance among the RGB which was. RGB Thus the control method of the backlight device, which independently drives for example a black and white area active drive or RGB LED units of RGB LED units driven by a white gray scale (gradation) for each of the RGB colors independent area active drive is being put to practical use.
Specifically, in the black and white area active drive, in any of the brightness maximum value of RGB contained in an input video signal, aligns the remaining color luminance value (luminance signal), the RGB LED unit It has been driven. Also, in the RGB independent area active drive, in accordance with the luminance value of each color of RGB contained in an input video signal, the luminance signal of the LED is generated corresponding in RGB LED unit, the LED is driven It had become way.
The RGB independent area active drive is compared with the black and white area active drive, when the image close to monochromatic flows, excellent color reproduction capability for color emit only of the backlight corresponding to the monochromatic and emit unwanted color is a highly preferred drive method for the effect to reduce power consumption because no.
However, in the conventional liquid crystal display device using the RGB independent area active drive, as described above, the transmission characteristics (CF characteristics), etc. of the color filters used in liquid crystal panel, that improve the display quality becomes difficult it was a. In particular, in the conventional liquid crystal display device, when the above-mentioned area active drive is performed, it becomes easily visible color change due to such light from adjacent areas (leakage light) (color shift) is, the display quality It was hardly done to improve.
Here, with reference to FIGS. 15 and 16, it will be described the problem of the conventional liquid crystal display device.
Figure 15 is a graph showing the spectral transmittance distribution of the color filter generally used in a liquid crystal display device (CF characteristics) and spectral distribution of the light emitting diodes of RGB (emission wavelength characteristics). Figure 16 is, in the conventional liquid crystal display device, a diagram illustrating a specific problem in the display image when carrying out the area active drive.
It will be described first problem of emission quality due spectral transmittance distribution (CF characteristics), etc. of the color filters.
As illustrated in curve 50 of FIG. 15, LED of red (R), green (G), blue (B) are respectively 635 nm, 520 nm, and a wavelength of about 450nm and a peak wavelength, a width wavelengths It emits. These R, LED unit configured G, and B LED is generally the cold cathode fluorescent tube having a steep wavelength band having significantly different emission spectra. Therefore, the wavelength of light emitted from the LED emits light, can be extended wavelength that can be expressed in the image than the conventional cold cathode fluorescent tube, it is possible to increase the color reproduction range of the CIE chromaticity diagram. In particular, for the wavelength of G, the main wavelength can be increased the most color reproduction range in the vicinity of 520 nm (Note, RGB color coordinates (x when a combination of CF and LED of FIG. 15, y), respectively, R (0.70,0.30), a G (0.16,0.73), B (0.15,0.03).).
However, on the other hand, color filters of red (R), green (G), blue (B), the curve of FIG. 15 60r, as illustrated 60 g, and 60b, respectively 635 nm, 535 nm, and a wavelength of about 465nm having transmission characteristics that best transmit light. Then, with the characteristics of transmitting light in the emitted wide wavelength range than the wavelength width of the light the LED. Thus, for example, the color filter of B (curve 60b) not only B LED transmits light of a wavelength emitted, will transmit a portion of light of a wavelength LED of G is emitted. The light LED of G emits light, will transmits G color filters of the color filter (curve 60 g) and B (curve 60b). This relationship also occurs in relation to other color filters and other colors LED of. Thus, there is a region that overlaps the spectral transmittance distribution of a particular color filter in the spectral distribution of a plurality of LED, which may cause deterioration of display quality due to the overlapping of the distribution (characteristics).
Next, when area active drive is performed, a color change (color shift) due like to light (leakage light) from an adjacent area will be described liable to be visually recognized.
For example, using the area active drive, when displaying bright white cloud floats image blue sky, as shown in FIG. 16, the blue sky 950 and the clouds 960a, the boundary portion 970a and 960b, to 970b, the chromaticity shift in accordance with there is an unnatural image is displayed (here, the blue sky, R = 112 at BLUE SKY 8 bit RGB signal Macbeth chart, G = 135, B = 169, white cloud (white) is a 8 bit RGB signal R = 249, which is G = 248, B = 248.).
To be more specific, in the area active drive, the blue sky color chromaticity (x; 0.25, y; 0.26) with respect to, for blue sky 950, can be displayed with a uniform sky blue (reproduced) there, while an empty 950 and clouds 960a, each boundary portion between 960b 970a, 970b is white light (all RGB LED from the RGB LEDs of the LED unit emitting light below the respective clouds 960a, 960b of pixel of composed white light with light, especially light) LED on G, so that the blue light from the LED included in the LED unit emitting light below the pixel of the sky 950 B are mixed together. Each boundary portion 970a, 970b, from the relationship between transmission characteristics and the LED properties of the color filters of B and G, the green light included in the white light will be transmitted. Therefore, y values ​​of 0.01 high (x; 0.25, y; 0.27) is a display, the original of the same color empty empty image in the display plane, air is generated with different chromaticity it may become unnatural display.
Thus, in the conventional liquid crystal display device, the area active drive, the LED brightness is different for each area, the color change at the boundary of the area (color shift) is liable to be visually recognized is generated.
In particular, if the LED spectral distribution of the G as shown in FIG. 15 is shifted to the transmission area side of the spectral transmittance distribution of the color filter of B, when the LED G is the largest luminance value on (each LED when magnitude relationship G >> R, the B light-emitting luminance weight), made from the color filter of B in the LED light G leaks, color shift look bigger. Therefore, it is especially undesirable where LED light G leaks from the color filter of B.
Each color spectral transmittance characteristics of raising the color purity of the color filters in order to resolve this behavior is also a method of complete isolation. However, for the G and B generally overlapping color filter wavelength bands, increasing the color purity of the color filter, attempts to complete separation of the emission wavelength of the LED having broad wavelength characteristics, is much reduced in the transmitted luminance weight undesirably occur.
In view of the above problems, the present invention, even when performing area active drive, and an object thereof is to provide a display device capable of improving display quality.
To achieve the above object, a display device according to the present invention, a backlight unit having a light emitting portion for emitting illumination light, using the illumination light from the backlight unit, information color display capable a display device having a configured display unit,
A plurality of pixels is provided on the display unit, the color filter is provided comprising a plurality of colors to the each pixel,
A plurality of illumination areas provided in the light emitting portion,
Together provided for each of said illumination area, a plurality of light sources for emitting a color of light corresponding to the color of the color filter,
Using the instruction signal inputted from outside, comprising a lighting control unit that controls each lighting drive of the plurality of light sources in each of the plurality of illumination areas,
Of the color filter composed of a plurality of colors provided on each of the pixels, a color filter having a predetermined color has a characteristic to transmit each light of a predetermined color of light sources and other light sources corresponding to the color filter ,
The lighting control unit, in each of the plurality of illumination areas, it is determined that the luminance signal value instructed for the predetermined color of the light source is greater than the luminance signal value instructed for other light sources, and determine that the value obtained by multiplying a predetermined ratio to the luminance signal value instructed for the predetermined color of the light source, which is the luminance signal value or a value instructed to the other light sources when, by using the luminance signal value instructed for the predetermined color of the light source, is characterized in that the turning on operation of the other light sources.
In a display device configured above, a plurality of light sources for emitting light of a color corresponding to the color of the color filter composed of a plurality of colors for each of the illumination areas are provided. Further, in the color filter composed of a plurality of colors, a color filter having a predetermined color, it has a characteristic of transmitting the respective light of a predetermined color of light sources and other light sources corresponding to the color filter. In each illumination area, determines that a brightness signal value instructed for a given color of the light source is greater than the luminance signal value instructed for other light sources, and wherein the predetermined color of the light source value obtained by multiplying a predetermined ratio to the luminance signal value instructed for the, when it is determined that it is the luminance signal value or a value instructed to the other light sources, a predetermined color using the indicated luminance signal value for the light source, the lighting control unit for lighting operation of the other light source is installed. Thus, the unlike the conventional example, even when performing area active drive, it is possible to prevent the color shift due like light from the adjacent illuminating area is visible. As a result, unlike the conventional example, even when performing area active drive, it is possible to construct a display device capable of improving display quality.
In the above display device, the display unit has a plurality of display areas which light from the plurality of illumination areas is incident respectively are set,
Using the input image signal, a display control unit for controlling the drive of the display unit for each pixel,
The lighting control unit, using the input video signal, for each of the illumination area, and determines a luminance value of light emitted from the corresponding light source,
Wherein the display control unit uses the luminance value of the illumination each area from the lighting control unit corrects an input video signal, and pixel drive control of the display unit based on a video signal after correction it is preferable to perform to.
In this case, as compared with the display device using a backlight device having discharge tubes such as a cold cathode fluorescent tube, high image quality, it constitutes a low power consumption area active drive compatible display device.
In the above display device, the display control unit uses the data of the preset PSF (point spread function), the luminance value of the illumination each area from the lighting control unit may be corrected.
In this case, the display control unit can display the information displayed on the display unit at a more appropriate brightness, it is possible to enhance the display quality.
In the above display device, the light source is preferably light-emitting diodes are used.
In this case, with excellent color reproducibility and long life, a compact light source can be easily configured, it is possible to easily constitute a display device miniaturized high performance.
In the above display device, the light source, red, green, and red respectively emitting blue light, green, and blue light emitting diodes are used,
The lighting control unit, in each of the plurality of illumination areas, it is determined that the luminance signal value instructed for the blue light-emitting diode is greater than the luminance signal value instructed for the light emitting diode of the green and that the value which the multiplied by a predetermined ratio to the luminance signal value instructed for the blue light source, which is the luminance signal value or a value instructed to the light emitting diode of the green when it is determined, by using the luminance signal value instructed for the blue light-emitting diodes, it may be the green light emitting diode is lit operation.
In this case, the lighting control unit is relatively close to the wavelength, for easy blue light and green light relatively cause a decrease in display quality only from practicing the discrimination processing described above, reduce the processing load of the lighting control unit it is possible to, the lighting control unit it is possible to perform the lighting control of the light emitting diodes at high speed.
In the above display apparatus, in the lighting control unit, based on predetermined CF characteristics and predetermined emission characteristics of the light source of the color filter, it is preferable that the predetermined ratio determined in advance are used.
In this case, the lighting control unit according to a predetermined CF characteristics and predetermined emission characteristics, it is possible to perform the lighting control of the light sources of the three colors more appropriately.
In the above display device, provided with a storage unit for storing the predetermined ratio of a plurality of types,
Based on the instruction signal from the outside, the said stored in the storage unit a plurality of types of selecting a predetermined ratio of one type from a predetermined ratio, selection instructing unit is provided to be output to the lighting control unit it is preferable to have.
In this case, the lighting control unit, becomes a predetermined ratio in accordance with the instruction signal is selected and output, the lighting control unit with a predetermined ratio that is selected, the plurality of each illumination area it is possible to appropriately control each lighting drive of the plurality of light sources.
In the above display device, the indication signal may be a display mode indication signal for designating a display mode in the display unit.
In this case, the user is selected optimum predetermined ratio in accordance with the display mode desired, can be appropriately performed in accordance with the display mode of the display on the display unit user desires.
According to the present invention, even when performing area active drive, it is possible to provide a display device capable of improving display quality.
It is a diagram illustrating a liquid crystal display device according to a first embodiment of the present invention. Is a plan view showing an arrangement example of LED substrates in the backlight device. Is a plan view showing an arrangement example of LED units on the LED substrate. It is a diagram illustrating a specific configuration example of the LED unit. It is a diagram illustrating another configuration example of the LED unit. It is a diagram illustrating a configuration of a main part of the liquid crystal display device. It is a block diagram showing a specific configuration of the data delay processing part shown in FIG. It is a block diagram showing a specific configuration of the backlight data processing part shown in FIG. It is a block diagram showing a specific configuration of an LED output data operation part shown in FIG. It is a flowchart showing a processing operation in the LED output data arithmetic unit. It is a flowchart showing another processing operation in the LED output data arithmetic unit. It is a diagram illustrating a specific example of a display image displayed by the liquid crystal display device. It is a diagram illustrating a main configuration of a liquid crystal display device according to a second embodiment of the present invention. It is a block diagram showing a specific configuration of the LUT control part shown in FIG. 13. It is a graph showing a liquid crystal display device in the spectral transmittance distribution of the color filter generally used (CF characteristics) and spectral distribution of the light emitting diodes of RGB (emission wavelength characteristics). In conventional liquid crystal display device, a diagram illustrating a specific problem in the display image when carrying out the area active drive.
Hereinafter, the preferred embodiments of the display device of the present invention will be described with reference to the drawings. In the following description, it will be exemplified a case where the present invention is applied to a transmission type liquid crystal display device. Further, the dimensions of constituent members in each figure do not faithfully represent the actual dimensions of the components and dimensional ratios and the like of the components.
Figure 1 is a diagram illustrating a liquid crystal display device according to a first embodiment of the present invention. In the figure, the liquid crystal display device 1 of this embodiment, under the liquid crystal panel 2, the non-display side of the liquid crystal panel 2 (FIG as a display portion for the upper figure is installed as a viewing side (display surface side) It is disposed on a side), and a backlight device 3 as a backlight part that generates illumination light for illuminating the liquid crystal panel 2 is provided. Further, in the present embodiment, the interior of the housing 4, the liquid crystal panel 2 and the backlight device 3 is housed in a state of being integrated as a liquid crystal display device 1 of the transmission type. Further, in the liquid crystal display device 1 of the present embodiment, a video signal input from the outside, the display control unit and the lighting control unit performs drive control of the liquid crystal panel 2 and the backlight device 3 are provided respectively ( details of which will be described later.).
The liquid crystal panel 2 includes a pair of transparent substrates 2a, and 2b, the transparent substrate 2a, and a liquid crystal layer 2c and a color filter (CF) 2d provided between the 2b. Further, the liquid crystal panel 2, a plurality of pixels are provided, with the illumination light from the backlight device 3, and is capable of displaying information such as characters and images in a full-color image. Further, the liquid crystal panel 2, as described later in detail, and a plurality of display areas set in the display surface.
A backlight device 3 is an optical sheet group 5 and a diffusion plate 6, red (R), green (G), and the LED substrate 7 mounting the LED unit 8 including the three color light emitting diodes of blue (B) It is provided. The optical sheet group 5, for example, polarizing sheet 7 and a prism (condensing) includes sheet 8, these optical sheets, such as brightness enhancement of the illumination light from the backlight device 3 is performed as appropriate, and so as to improve the display performance of the liquid crystal panel 2.
In the backlight device 3, a plurality of LED substrates 7 are provided in a matrix, a plurality of LED units 8 are installed on each LED substrate 7. Further, in the backlight device 3, for a plurality of display areas provided on the liquid crystal panel 2, a plurality of illumination areas where light of the light emitting diode as a light source is incident, each of the light-emitting portion that emits the illumination light is set to a plurality of LED substrates 7, area active backlight drive for the light emitting diode lighting driven is to be carried out in the illumination area units.
Here, with reference to FIGS. 2 to 4, the LED substrate 7 and the LED unit 8 of this embodiment will be described.
Figure 2 is a plan view showing an arrangement example of LED substrates in the backlight device, and FIG. 3 is a plan view showing an arrangement example of LED units on the LED substrate. Figure 4 is a diagram illustrating a specific configuration example of the LED unit.
As illustrated in FIG. 2, the backlight device 3, two rows, a total of 16 provided in eight columns LED substrate 7 (1), 7 (2), ..., 7 (15), 7 (16 ) (hereinafter, occasionally represented by "7".) it is placed. Further, in the LED substrate 7, as illustrated in FIG. 3, two rows, 16 columns are divided into a total of 32 regions, each region, LED unit 8 is mounted. Further, 32 areas, the backlight device 3 which is set to the above illumination area Ha1, Ha2, ..., Ha31, Ha32 (hereinafter, occasionally represented by a "Ha".) The constituting respectively.
In FIG. 3, in order to clearly illustrate the respective illumination areas Ha, are shown separated from one another by a vertical bar and a horizontal line in the figure, in fact, each of the illumination areas Ha are borders or the partition member such as not separated from each other by. However, for example, on the LED substrate 7 provided with a partition member, it can be mutually separated by constituting each lighting area Ha.
As illustrated in FIG. 4, each illumination area Ha, the LED unit 8 having RGB light-emitting diodes 8r positioned at vertexes of a triangle, 8 g, and 8b are provided. Further, the respective illuminating areas Ha are set in the display surface of the liquid crystal panel 2 is provided so as to correspond to the display area Pa, for a plurality of pixels P included in the display area Pa, LED units 8 so that the light is incident from. Note that the above-mentioned display surface, for example, 1920 × 1080 pixels are provided, on the one display area Pa, contains pixels 4050 pieces (= 1920 × 1080 ÷ 512 (= 16 × 32)) .
Further, the light-emitting diodes 8r, 8 g, 8b constitute light sources, these light-emitting diodes 8r, 8 g, 8b is to illuminate the display area Pa corresponding red light, green light, and blue light, respectively It has become.
The configuration of the LED unit 8 of this embodiment is not limited to those shown in FIG. 4, as illustrated in FIG. 5, for example, in consideration of the luminous efficiency of the RGB light-emitting diodes, one it is also possible to use a blue light-emitting diode 8b, the LED unit 8 having a respective two red and green light emitting diodes 8r1,8r2 and 8G1,8g2.
In the above description, a case has been described using an LED substrate 7, for example by integrating the installation of the LED substrate 7 by directly placing the LED units on the inner surface of the housing 4, a thinner and the backlight device. Further, each installation number of the LED substrates 7 and the LED units 8 or appropriately changed, may be subjected to a set illumination area Ha and the display areas Pa at a ratio other than 1: 1.
Further, the division number of the LED unit 8 may be 20 without example 10 × be limited to 32 the 16 ×.
However, if the number of light-emitting diodes is extremely small with respect to the size of the liquid crystal panel 2, low light or to the display surface, LED characteristics variation, unevenness of the luminance distribution by the optical distance spread of the adjacent LED units since it is impossible to prevent in LCD correction operation, for example with respect to the liquid crystal panel 2 of about 40 to 70 inches, it is preferable to place 500 or more LED units 8.
Moreover, LED unit 8 of the present embodiment is preferably formed of a light-emitting diode can be increased as much as possible the color reproduction range of the CIE chromaticity diagram. That is, if explained in the dominant wavelength, G is 510 ~ 530 nm in the vicinity of an inflection point on the CIE curve (about 520nm before and after), B is 430 ~ 460 nm, R is 630 ~ 650 nm is preferred.
Here the range setting of the wavelength, the dominant wavelength dominant wavelength of 430nm smaller values ​​and R and B does not use a 650nm greater than is obtained by considering the influence of human visibility and CF. In other words, the human visual sensitivity takes a peak at 555 nm, B, extremely short wavelength side of the main wavelength of R, to design the long wavelength side, because it causes a decrease in visibility, decrease in emission power efficiency (consumption undesirably causes an increase, etc.) of power. For further B and R light-emitting diode may be any value that can be adjusted to be about 100% covers the color reproduction range of NTSC (National Television System Committee), which is adopted as the color television broadcasting system.
Incidentally, while as far as possible covers the color reproduction range as dominant wavelength of G is Pointer's Color, in order to reduce as much as possible the influence of the transmission to the CF of B than the emission wavelength of G, a main wavelength of 520 ~ 530 nm it is particularly preferable to use a range of.
Further, in the present embodiment, the RGB-CF characteristics that are commonly used, light transmitted through the CF is, colors existing in nature, a wide color reproduction range so as to substantially encompass e.g. Pointer's Color formed, also visibility is also selecting the wavelength of the LED to account. That is, as illustrated in FIG. 13 uses a light emitting diode which R = 635nm, G = 520nm, the wavelength of B = 450 nm dominant wavelength.
The color filter (CF) 2d uses a color filter having a spectral transmittance characteristic shown in FIG. 13 for example. Method of color filter, a method of construction in RGB3 colors, but in addition to RGB3 colors method of increasing the color reproduction range is a multiple primary color scheme add CF such as yellow or cyan, the multi-primary color system, color (for example, display the tristimulus values ​​of the target XYZ) for the number of combinations and algorithms are complex, in the present embodiment, a liquid crystal CF most simple constructed RGB3 colors, using RGB3-color light source corresponding thereto It has achieved a wide color reproduction range Te.
Then, as shown in curve 60r, 60 g, and 60b in FIG. 13, respectively 635 nm, the color filter (CF) 2d is, 535 nm, and the most transmittance good wavelength region of about 465 nm, respectively 580 ~ 700 nm, 475 ~ 605 nm, with the transmittance characteristics of 400 to 0.1 or more of the transmittance 530 nm (if the maximum transmittance was 1). That has the characteristics of transmitting light in a wide wavelength range than the wavelength width of emitted light of the light emitting diode. Therefore, a relationship in which there is a region that overlaps the spectral transmittance distribution of the color filter of the spectral distribution and B of light-emitting diode 8g of G.
Next, with reference also to FIGS. 6-9, performs drive control of each of the liquid crystal display device 1 of the present embodiment will be described the display control unit and the lighting control unit.
Figure 6 is a diagram illustrating a configuration of a main part of the liquid crystal display device, FIG. 7 is a block diagram showing a specific configuration of the data delay processing part shown in FIG. Figure 8 is a block diagram showing a specific configuration of the backlight data processing part shown in FIG. 6, FIG. 9 is a block diagram showing a specific configuration of an LED output data operation part shown in FIG.
As shown in FIG. 6, the liquid crystal display device 1, LUT constituting an image signal input unit 9 for receiving and processing a video signal input from the outside, a storage unit in which predetermined data is stored in advance (Look- and Up Table) 10, and the RGB signal processing unit 11 is provided which is connected to the video signal input section 9. Further, the liquid crystal display device 1, the color signal correcting part 12 are sequentially connected to the RGB signal processing unit 11, a data delay processing part 13, and a driver control section 14, a color signal correcting unit 12 and the data delay processing part 13 a backlight data processing part 15 connected between the connected G (gate) driver 16 and S (source) driver 17 is provided to the driver controller 14.
Then, the liquid crystal display device 1, according to the video signal input to the video signal input section 9, by the driver controller 14 outputs an instruction signal to the G driver 16 and the S driver 17, the liquid crystal panel 2 pixels is driven, and, by the backlight data processing part 15 outputs an instruction signal to the backlight device 3, the light-emitting diodes 8r of the LED units 8, 8 g, 8b are adapted to drive the lighting.
The video signal input unit 9, a color signal indicating a display color on the display image from an antenna not shown, the luminance signal the luminance of each pixel, and a composite video signal including a like synchronizing signal is input. RGB addition, the RGB signal processing unit 11, the composite video signal from the video signal input unit 9, and converted into RGB separate signals by performing chroma processing, and matrix conversion processing, RGB signal processing unit 11, which converts the It outputs a separate signal to the color signal correcting part 12.
The color signal correction portion 12, with respect to the RGB separate signals are determined based on such color reproduction range or the display mode of the liquid crystal panel 2, applies predetermined correction processing, the corrected video signal (R ' G'B 'is converted to the separate signal). Specifically, the color signal correction portion 12 is adapted measurement result of the intensity of outside light (amount of light) is inputted from the optical sensor provided in the liquid crystal display device 1 (not shown), color signal correction portion 12 uses the measurement result, a change in the color reproduction range due to the influence of external light on the liquid crystal panel 2 is calculated, color conversion processing is performed so that the optimum display color in the state of external light .
Further, the color signal correcting part 12 reads a specific color color signals, such as human skin, is entered more users or correcting the signal value to a color feel preferred, such as from a remote controller accompanying the liquid crystal display device 1 depending on the display mode, and is configured or raise or lower the brightness of the entire display surface. Then, the color signal corrector 12, the R'G'B 'separate signal data delay processing part 13 and a frame (display image) units after performing referring to γ ​​processing γ data LUT10 the (linearized) and outputs to the backlight data processing part 15.
Data delay processing part 13, in order to match the operation timing of the operation timing and the backlight device 3 of the liquid crystal panel 2, a processing unit that delays the data of the instruction signal is output to the liquid crystal panel 2 side, for example, ASIC ( Application Specific Integrated Circuit) using is configured.
Specifically, the data delay processing part 13, as shown in FIG. 7, the delay processing section 18, an LED image brightness creating part 19, a target color correction arithmetic unit 20, a video luminance signal output unit 21 It is provided. The delay processing section 18, the color signals R'G'B 'separate signal (video signal) is input from the correcting unit 12, a predetermined time the video signal, with a delay, substantially the delay processing of the data It is adapted to perform in specific.
The LED image brightness creating part 19, so that the luminance signal of each LED unit 8 from the backlight data processing part 15 is input. The luminance signal of each LED unit 8, the corresponding LED unit 8 includes the light-emitting diodes 8r are, 8 g, the luminance value of 8b is indicated. Moreover, LED image luminance creating unit 19 subjects the input luminance signal of the LED unit 8, PSF; acquires data (Point Spread Function PSF) from LUT 10. Then, LED image brightness creating part 19, the light-emitting diodes 8r being instructed, 8 g, and the luminance value of 8b, by using the PSF of the data obtained, LED brightness value considering the data of PSF, i.e. all each light-emitting diodes 8r corresponding to the pixels (e.g., 1920 × 1080 pixels), 8 g, and calculates a gradation signal data 8b, and outputs a target color correction arithmetic unit 20.
The data of the PSF, each light-emitting diodes 8r, 8 g, the light from 8b, a numerical value obtained by measuring or calculating the spread of light visible through the liquid crystal panel 2 including an optical sheet group 5, previously stored in the LUT 10. Further, by using the data of the PSF, it is possible to display the information displayed on the LCD panel (display section) 2 in a more appropriate brightness, it is possible to enhance the display quality. Further, the LUT 10, gamma data and the light emitting diodes 8r, 8 g, tone characteristic data (linear characteristics) of 8b, etc. are stored.
Target color correction arithmetic unit 20 uses the predetermined CF characteristics of the color filter, so as to correct the input video signal. Specifically, the target color correction arithmetic unit 20, the input and R'G'B 'separate signal from the delay processing section 18 (video signal), and the gradation signal data from the LED image brightness creating part 19 It is adapted to be. Then, the target color correction arithmetic unit 20, to the R'G'B 'separate signal (numerator) of each pixel, divided by the light-emitting diodes 8r, 8 g, 8b tone signal data (denominator) corresponding to the pixel by, thereby obtaining a to be output from the LCD signal driver side R "G" B "video brightness signal.
Video luminance signal output unit 21, to the corrected the R "G" B "video brightness signal from the target color correction arithmetic unit 20 acquires the gamma data from the LUT 10 (white temperature data with respect to gray scale), gamma performing tone correction. the video brightness signal output part 21 outputs a video brightness signal to the driver controller 14.
In the present embodiment, it is assumed that the video signal entered from the video signal input part 9 considering a TV broadcasting signal is input is the inverse γ processing. Therefore, if if the video signal such as a TV that has entered from the video signal input part 9 is input with a linear gray scale, it is also possible to omit the implementation of a process γ listed in the present embodiment.
Driver control unit 14 uses the video luminance signal from the video brightness signal output unit 21 generates and outputs a respective command signal to the G (gate) driver 16 and S (source) driver 17. In addition, the G driver 16 and the S driver 17 are connected to the plurality of gate lines provided in the liquid crystal panel 2 (not shown) and a plurality of signal lines (not shown). Then, G driver 16 and the S driver 17 in accordance with an instruction signal from the driver control unit 14, by outputting each gate signal and a source signal to the gate lines and the signal lines, the liquid crystal panel 2 is driven for each pixel Te, an image is displayed on the display surface.
LED image luminance creating unit 19, the target color correction arithmetic unit 20, a video luminance signal output unit 21, and a driver control section 14, using the luminance values ​​of the illumination each area from the lighting control unit will be described later (backlight data processing part) Te, it corrects an input video signal, and has a display control unit that performs the pixel drive control of the display unit based on the corrected video signal (liquid crystal panel).
In the above description, LED image luminance creating unit 19, the target color correction arithmetic unit 20, and has been described as being installed video luminance signal output unit 21 to the inside of the data delay processing part 13, the present embodiment this is not limited to, for example, provided with a delay processing section 18 separately, LED image luminance creating unit 19, the target color correction arithmetic unit 20, and the video brightness signal output part 21 and the driver control unit 14 and a display control unit it may be provided integrally as.
Further, the color signal correction portion 12, as shown in FIG. 6, is connected the backlight data processing part 15, R'G'B 'separate signal (video signal) to the backlight data processing part 15 It is adapted to be input. Further, the backlight data processing part 15, for example, ASIC is used and the backlight data processing unit 15 uses the input video signal, enters the display area Pa corresponding plurality of respective illumination areas Ha the luminance value of the light, to determine for each of the light sources (light emitting diodes), constituting the lighting control unit for controlling the driving of the backlight device 3.
That is, the backlight data processing part 15 subjects the input video signal, with reference to the LUT 10, the light-emitting diodes 8r, 8 g, and is configured to output the PWM signal value for 8b to the LED substrates 7 . In the present embodiment, by the the lighting control section and the display control unit, compared to a liquid crystal display device using a backlight device having discharge tubes such as a cold cathode fluorescent tube, high image quality, low power consumption and to be able to configure the liquid crystal display device 1 of the area active drive corresponding.
Specifically, back to the write data processing unit 15, as shown in FIG. 8, the color signal correction unit image luminance extracting section 22 which are sequentially connected to 12, LED output data arithmetic unit 23, and LED (PWM) output unit 24 is provided. Further, the backlight data processing portion 15, the luminance in each LED unit 8 for each illuminating area Ha, and the luminance signal value instructed for the blue light-emitting diode 8b, which is instructed to green light-emitting diode 8g It compares the signal value, using the comparison result, by lighting operation the green light-emitting diode 8 g, adapted thereby improving the light emission quality (described later in detail.).
The image brightness extracting part 22, based on the R'G'B 'image signal, for example, to extract the maximum luminance of each color of RGB of a display image in each display area Pa. In other words, the image brightness extracting part 22 'from the image signals, R'G'B in the display area Pa corresponding to each illuminating area Ha' R'G'B extracts the maximum value of the luminance signal, corresponding illumination light-emitting diodes 8r in area Ha, and outputs 8 g, the LED output data arithmetic unit 23 as a reference indication value of the luminance values ​​of 8b.
Besides the above description, based on the image brightness extracting part 22 the R'G'B 'image signal, for each display area Pa, and calculates a luminance average value of each color of RGB in the corresponding illuminating area Ha It may be a light emitting diode 8r, 8 g, the reference indication value of the luminance values ​​of 8b in the lighting area. Further, the image brightness extracting part 22, by mixing averaging both the luminance maximum and luminance average value may be output to the offset calculating section 23 as the reference indication value. However, as described above, towards the case of using the luminance maximum value as a reference indication value it is preferable in that it can be easily made to have a peak luminance in the display image.
Moreover, it picked up if there is noise in the image input from outside, when extracting the maximum value of the R'G'B 'brightness signal of the display area Pa, the noise signal (e.g., maximum brightness signal value) and it will not be extracted the maximum accurate luminance signal. Therefore, as a method of removing (relaxing) the noise signal, for example, by dividing the pixels in the display area Pa every 20 pixels, the maximum value of the values ​​obtained by respectively averaging, R'G'B in the display area Pa ' It may be a maximum value of the luminance signal.
LED output data arithmetic unit 23 based on the maximum value of the R'G'B 'brightness signal for each illuminating area Ha from the image brightness extracting part 22 (maximum brightness value), the light emitting diode of the corresponding LED unit 8 8r, 8 g, with obtaining the luminance signal 8b, obtained light-emitting diodes 8r, 8 g, relative 8b luminance signal, is configured to perform the predetermined correction processing.
Specifically, the LED output data arithmetic unit 23, as shown in FIG. 9, by using the video signal inputted from the outside (instruction signal), the luminance of the light emitted from each of the plurality of illumination areas Ha luminance calculator 25 obtains the calculated values, and the brightness calculating unit 25 of the calculation result emission of each illumination area Ha based on diodes 8r, 8 g, to determine the brightness level of 8b, luminance determines the necessity of its lighting operation level determining unit 26 is provided. Also, LED output data arithmetic unit 23, light-emitting diodes 8r corresponding to the basis of the determination result of the brightness level determination unit 26, 8 g, relative to 8b, the lighting instruction unit 27 for instructing the lighting operation, the luminance calculation unit 25 against the calculation result, the correction unit 28 for performing a predetermined correction process, all the light-emitting diodes 8r in the previous emission operation (display operation), 8 g, the 8b luminance signal data (luminance calculated) predetermined such and a storage unit 29 for storing data.
Luminance calculation unit 25, based on the brightness maximum value for each RGB from the image brightness extracting part 22, the corresponding illumination areas Ha, that is determined emitting diodes 8r of the LED units 8, 8 g, the brightness calculated value of 8b. Also, the luminance calculation value, the light-emitting diodes 8r, 8 g, relative to 8b, a said luminance signal value instructed by the input video signal, using the processing sequence of the subsequent brightness level determining part 26 it is the data.
Luminance level determination unit 26 determines light-emitting diodes 8r of each LED unit 8 from the brightness calculating unit 25, 8 g, based on the luminance calculated value of 8b, corresponding light emitting diodes 8r, 8 g, the necessity of lighting operation of 8b to. The luminance level determination section 26, for each LED unit 8 (illuminating area Ha), based on the brightness calculated value of light-emitting diodes 8b, compared the magnitude of the luminance calculated values ​​of the light-emitting diode 8g (level), It has the comparison result so as to lighting operation of the light-emitting diode 8g based on (described later in detail.).
Also, the brightness level determination unit 26, by using the value of the minimum offset brightness which is previously stored in the LUT 10 (e.g., 1% of the emission maximum possible brightness of the LED), the target color correction arithmetic unit 20 described above R "G" B "so that the video luminance signal can be obtained reliably. that is, the brightness level determining part 26 obtains the value of the minimum offset brightness of a corresponding color from LUT 10, the light-emitting diode 8r , 8 g, if the value of any of the tone signal data 8b is less than the value of the minimum offset brightness, replaces the luminance value of the light-emitting diodes is less than the value on the obtained value.
By performing the replacement process described above, the target color correction arithmetic unit 20, light-emitting diodes 8r, 8 g, 8b luminance values ​​of the (gradation signal data) denominator, in performing the division described above, " 0 "and with avoidance of insufficient precision and errors caused by the use of a value in the vicinity, it is possible to avoid small characteristic variations such as an LED light emission and the LED board current supply capability of, R in the target color correction arithmetic unit 20 the "G" B "video brightness signal can be reliably calculated.
Incidentally, it is preferable that not too large value of the minimum offset brightness, for example the previously set to approximately 0.1% to 10% of the emission maximum possible brightness preferred.
Lighting indication part 27, based on the determination result from the brightness level determining section 26, the light emitting diodes 8r of each corresponding LED unit 8, 8 g, relative to 8b, to instruct the lighting operation.
Correcting unit 28, for each illumination area Ha (LED unit 8), by referring to the storage unit 29, as consistent with the previous brightness calculated value determined by the luminance calculation unit 25 is secured, the It is configured to correct the brightness calculated value determined by the luminance calculation unit 25. Thus, in the backlight device 3 of the present embodiment, in each of the illumination areas Ha, can be prevented from the previous lighting operation luminance change from becoming extremely large, light emission quality can be prevented from being lowered.
The correction unit 28, for each illumination area Ha, so that the luminance balance between the illumination area Ha adjacent becomes a value within a predetermined balance range, the luminance calculation value determined by the luminance calculation unit 25 It is configured to correct. Thus, in the backlight device 3 of the present embodiment, in each of the illumination areas Ha, it is possible to prevent a large luminance change between the illumination area Ha ambient occurs, emission quality can be prevented from decreasing be able to.
Also, LED output data arithmetic unit 23, to the LED (PWM) output unit 24 and the data delay processing part 13, and outputs a luminance signal of each LED unit 8 after correction calculated by the correction unit 28.
LED (PWM) output unit 24, a luminance signal of each LED unit 8 from the LED output data arithmetic unit 23, by using the PWM control data from the LUT 10, the light-emitting diodes 8r corresponding LED unit 8, 8 g, 8b generates a PWM signal for driving the outputs to the corresponding LED substrate 7. Thus, in the LED substrate 7, in accordance with the PWM signal, the light-emitting diodes 8r, 8 g, 8b is emitted.
In the above description, the light-emitting diodes 8r by PWM dimming using a PWM signal, 8 g, was described for the case of driving the 8b, this embodiment is not limited thereto, for example, current dimming each light-emitting diodes 8r using (here means a gradation control method according to varying by the input gradation signal LED current values), 8 g, may be driven 8b.
However, as described above, towards the case of using the PWM dimming is preferred than using current dimming. That, LED color temperature is located depends on the operating current, while obtaining desired brightness, to maintain faithful color reproduction drives the LED with a PWM signal to suppress the change in color it is because it is necessary.
In addition to the above description, LED (PWM) using a detection result of the sensor means, such as a temperature sensor and a timer provided in the liquid crystal display device 1 to the output unit 24, a luminance signal from the LED output data arithmetic unit 23 the structure for correcting may be provided. That, LED (PWM) output unit 24, using the detection results of the temperature sensor, the light-emitting diodes 8r due to changes in ambient temperature, 8 g, or to correct the change in 8b luminous efficiency, the lighting time from the timer measurement results using respective light emitting diodes 8r due to aging, 8 g, may be added configure features or to correct such changes and color changes 8b luminous efficiency.
Referring now to FIG. 10, the operation of the liquid crystal display device 1 of the present embodiment. In the following description, light emitting diodes 8r in each LED unit 8 in the LED output data arithmetic unit 23, 8 g, the lighting operation of 8b mainly described.
Figure 10 is a flowchart showing a processing operation in the LED output data arithmetic unit.
As shown in step S1 of FIG. 10, the LED output data arithmetic unit 23 for each illumination area Ha luminance calculation unit 25, based on the brightness maximum value for each RGB, the corresponding LED unit 8 emitting diodes 8r, 8 g It calculates the brightness calculated value of 8b, and outputs the luminance level determination section 26.
Next, the brightness level determination unit 26, in each LED unit 8, the light emitting diodes 8r, 8 g, of 8b, luminance calculated values ​​of the light-emitting diode 8b (B-LED brightness signal value) of whether the maximum determination and (step S2), and if it is determined that it is not the maximum, the process proceeds to step S5 described later.
On the other hand, in step S2, the brightness calculated value of light-emitting diode 8b is determined to be a maximum, the brightness level determination unit 26, to the value obtained by multiplying a predetermined ratio to calculate brightness value of the light-emitting diode 8b, the light emitting diode brightness calculated value of 8g to determine whether it (G-LED brightness signal value) or more (step S3). That is, the brightness level determining unit 26, light emission luminance calculated value of the diode 8g is determined whether it is pre-stored the predetermined ratio is a light emitting diode 8b value or by multiplying the luminance calculation value in LUT10 Te, calculate brightness value of the light-emitting diode 8g is less than a value obtained by multiplying a predetermined ratio to calculate brightness value of the light-emitting diode 8b (i.e., a small influence of the LED brightness of G with respect to CF of B) If it is determined that the , the process proceeds to step S5 which will be described later.
The predetermined ratio used in Step S3, the predetermined CF characteristics and light-emitting diode 8b of the color filter 2d, based on a predetermined emission characteristics of 8 g, in which predetermined. Specifically, a predetermined ratio, by performing such tests or simulation using the actual product of the liquid crystal display device 1, is determined the value of the appropriate ratio, are stored in advance LUT10 to. Thus, the brightness level determining unit 26, in accordance with the predetermined CF characteristics and predetermined emission characteristics, light-emitting diodes 8b, it is possible to perform the lighting control of 8g more appropriately.
On the other hand, in step S3, (the greater the influence of the LED brightness of G with respect to CF of B) emission value obtained by multiplying the predetermined ratio to calculate brightness value of the diode 8b is greater than or equal to the brightness calculated value of the light-emitting diode 8g that When determining the brightness level determining unit 26, the brightness calculated value of light-emitting diode 8g is to be the same value as the luminance calculation value of the light-emitting diodes 8b, it changes the brightness calculated value of the light-emitting diode 8g (step S4).
As described above, in the brightness level determining part (lighting control part) 26, a wavelength is relatively close, for easy blue light and green light causes deterioration of emission quality relatively only to carry out the determination processing described above from, it is possible to reduce the processing load of the lighting control unit, lighting control unit is preferably in that it is possible to perform the lighting control of the light emitting diodes at high speed.
Note that the light-emitting diodes 8r, since the influence of the interference of the wavelength of the light-emitting diode 8b is small, the brightness level determining unit 26, light-emitting diodes 8b, not running comparison of the brightness calculated value of 8r. However, this embodiment is not limited thereto, as shown in steps S6 and S7 in FIG. 11 in accordance with the relationship between the characteristics of the color filter and the light-emitting diode, the same processing as the steps S3 and S4, and performed on the luminance calculated value of the light-emitting diodes 8r, may be a lighting control of the light-emitting diode 8r allowed more accurately performed.
That is, light is emitted when the value obtained by multiplying a predetermined ratio to the luminance calculation value of the diode 8b is judged to be at least luminance calculated value of the light-emitting diodes 8r, light emitting diodes brightness calculated value of 8r light-emitting diode 8b luminance Calculated so as to have the same value as may be changed to calculate brightness values ​​of the light-emitting diode 8r. The predetermined ratio used in the step S6, be determined using predetermined emission characteristics of the light-emitting diode 8r is preferable in that perform the lighting control of the light-emitting diodes 8r more appropriately.
Thereafter, the LED output data arithmetic unit 23, for each corrector 28 is illumination area Ha, as consistent with the previous brightness calculated value is ensured, and the brightness balance between the illumination area Ha adjacent as but a value within a predetermined balance range, light emitting diodes 8r, 8 g, after correcting for the luminance calculated value of 8b (step S5), and these luminance calculated values ​​LED (PWM) output part 24 and the data delay is output to the processing unit 13.
As described above, in the present embodiment is constructed as described, for each of the illuminating areas Ha, RGB light-emitting diodes (light sources) 8r, 8 g, the LED unit (light source) 8 including the 8b are provided. In each illumination area Ha, the brightness calculated value of the blue light-emitting diode 8b luminance calculated value of (predetermined color of the light source) (luminance signal value) other light-emitting diodes 8r, 8 g (other light sources) (luminance signal determine larger than the value), and, when the value obtained by multiplying a predetermined ratio to the luminance calculated value of the blue light-emitting diode 8b is, it is determined that this is a green light-emitting diode 8g luminance calculated value or more, using the luminance calculation values ​​of the blue light-emitting diode 8b, the backlight data processing part for lighting operation the green light-emitting diode 8 g (lighting control part) 15 is provided. Thus, the unlike the conventional example, even when performing area active drive, it is possible to prevent the color shift due to such light from the illumination area Ha adjacent is viewed. As a result, in the present embodiment, unlike the conventional example, even when performing area active drive, it is possible to improve color reproduction capability, a liquid crystal display device (display device) 1 capable of improving the display quality can do.
Specifically, as illustrated in FIG. 12, the air 30 can display natural sky blue with the same chromaticity within the display plane (reproduced). That is, the in each boundary portion between the white clouds 31, 32 empty 30, the processing operation shown in step S4 in FIG. 10 is executed, in the respective boundary portions is visually recognized unnecessarily blue color change is prevented, and are generated color misregistration is suppressed due to the LED characteristics relationship of the color filter, a G B, and as much as possible suppressed that unnatural images are displayed.
Figure 13 is a diagram illustrating a main configuration of a liquid crystal display device according to a second embodiment of the present invention, FIG 14 is a block diagram showing a specific configuration of the LUT control part shown in FIG. 13. In the figure, the main difference between the present embodiment and the first embodiment is provided with a LUT control unit for controlling the LUT, based on the instruction signal from the outside, the output to the backlight data processing part from the LUT in that to change the predetermined ratio to be. It should be noted that elements common to the first embodiment are denoted by like reference numerals and will not be repeated description.
That is, as shown in FIG. 13, in the liquid crystal display device 1 of the present embodiment is connected to the LUT 10, LUT control unit 30 is provided for controlling the LUT 10. The LUT control part 30, as illustrated in FIG. 14, the video display mode storage unit 31, is provided with a LUT value change processing unit 32, according to a display mode instruction signal from outside (instruction signal) Te is output from the LUT10 the backlight data processing part (lighting control part) 15, and is configured to change the predetermined ratio.
Specifically, in the liquid crystal display device 1 of the present embodiment, the liquid crystal panel and (video) display modes in the (display unit) 2 is more set, depending on the desired user, one display mode appropriate It is adapted to be selected. More specifically, in the liquid crystal display device 1 of the present embodiment, in addition to the standard mode of the first embodiment (standard display mode), for example a dynamic mode, movie mode, and PC (Personal Computer) predetermined ratio are different display modes such as the mode is configured to be selected. In these display modes, the value of a specific predetermined ratio, standard mode, the dynamic mode, movie mode, and the value is for example 0.6 (60%) in the PC mode, 0.5 (50%), 0 .7 (70%), and are set respectively to 1.0 (100%). The value of predetermined ratio in each of these display modes, by performing such tests or simulation using the actual product of the liquid crystal display device 1, is previously set for each display mode, the LUT value change processing part 32 It is stored in advance.
In the dynamic mode, as compared with the standard mode, the display emphasizing the contrast is performed in the liquid crystal panel 2. Further, in the movie mode, as compared with the standard mode, it displays suitable for tone reproduction is performed in the liquid crystal panel 2, in the PC mode, monochrome (display) drive is performed in the liquid crystal panel 2.
Further, the LUT control part 30, for example via a remote controller provided in the liquid crystal display device 1 is configured to display mode desired by the user is inputted as the display mode indication signal. Then, the LUT control part 30 stores a display mode specified by the display mode indication signal video display mode storage unit 31, and notifies a signal indicating the display mode stored in the LUT value change processing unit 32.
LUT value change processing unit 32, together with the LUT 10, thereby constituting a storage unit for storing a plurality of types of predetermined ratio, based on the display mode instruction signal from outside (instruction signal) stored in the storage unit select one kind of predetermined ratio from a plurality of types of predetermined ratios, selection instructing unit functions to output to the backlight data processing part (lighting control part) 15 is given. That, LUT value change processing part 32, as described above, stores beforehand four types of predetermined ratios corresponding to four display modes. Then, based on the signal input from the video display mode storage unit 31, when determining the display mode desired by the user, selects a predetermined ratio in the discriminated display mode, and stores the output in LUT10 the LUT10 . Then, LUT 10, the predetermined ratio stored is properly outputs a predetermined ratio to the the backlight data processing part (lighting control part) 15 as used in the arithmetic processing in the backlight data processing part 15.
With the above configuration, this embodiment can achieve the same action and effect as the first embodiment. Further, in the present embodiment, provided with a LUT control part 30 for controlling the LUT 10, is output on the basis of the display mode instruction signal from outside (instruction signals), the backlight data processing part (lighting control part) 15 from LUT 10 that have changed the predetermined ratio. Thus, in this embodiment, to the backlight data processing portion 15, becomes a predetermined ratio in accordance with the instruction signal is output after being selected, the backlight data processing part 15 given ratio chosen is with, it is possible to properly control the plurality of light emitting diodes (light sources) 8r, 8 g, each lighting drive of 8b in each of the plurality of illumination areas Ha. Further, since the display mode indication signal to which the display mode instruction signal specifying a display mode of the liquid crystal panel (display unit) 2, in the present embodiment, the optimum predetermined ratio in accordance with the display mode desired by the user is selected, it is possible to properly perform in accordance with the display on the liquid crystal panel 2 in the display mode desired by the user.
For example, in the above description, the present invention has been described as being applied to the transmission type liquid crystal display device, the backlight device of the present invention is not limited thereto, by utilizing light from a light source, an image it can be applied to various display devices having a display section of the non-light-emitting type that displays information such as characters. Specifically, it is possible to use a display device of the present invention preferably a transflective liquid crystal display device, or the liquid crystal panel in a projection display device such as a rear projection using the light valve.
In the above description, as shown respectively in steps S4 and S7 in FIG. 11, the case has been described where the changing G-LED brightness signal value and the R-LED brightness signal value to each B-LED brightness signal value the invention determines that a brightness signal value instructed for a given color of the light source is greater than the luminance signal value instructed for other light sources, and an instruction for a given color of the light source the value obtained by multiplying a predetermined ratio to the luminance signal value, when it is determined that the luminance signal value or values ​​indicated for other light sources, directed against a given color of the light source using the luminance signal value, as long as it is turned operate the other light sources. Specifically, for example, in step S4, a value obtained by multiplying a predetermined ratio to the B-LED brightness signal value, as a G-LED brightness signal value may be turned operate G-LED. Similarly, in step S7, the B-LED brightness signal value a value obtained by multiplying a predetermined ratio, as R-LED brightness signal value may be turned operate R-LED.
In the above description has described case where the direct-type backlight device, the backlight device of the present invention (backlight unit) is not limited to this, for example, an edge light type or a lighting area it is also possible to configure a tandem other type backlight device provided with a light guide plate for guiding light from the light source for each.
The ones in the above description, a case has been described using RGB light-emitting diodes as the light source, the present invention using a plurality of light sources whose emission colors of light corresponding to the color of the color filter composed of a plurality of colors as long, it may also be used such as other light emitting devices and PDP (Plasma Display Panel) source or a discharge tube other points, such as such as an organic EL (Electronic Luminescence). It is also possible to use a hybrid light source mix point light source or a discharge tube.
However, as described above, towards the case of using a light emitting diode, it is excellent in color reproducibility and cost competitiveness, becomes configurable compact light sources readily long life, miniaturized backlight performance preferable in that it is possible to easily configure the device. Further, as described above, the red, green, and better in the case where the blue light-emitting diodes used is preferable in that it is possible to easily configure an excellent backlight device color reproducibility.
In the above description, by using the video signal lighting control unit (backlight data processing part) is input, along with the provided in each illumination area, each lighting drive of the color mixture which can be three-color light source into white light It has been described for controlling, lighting control unit of the present invention, by using the instruction signal from the outside, nothing like are not limited as long as it controls each lighting drive of the plurality of light sources of each lighting area.
Furthermore, in the above description, the description has been given of the blue light-emitting diodes and other light-emitting diode, the relationship between the spectral distribution and the spectral transmittance distribution of the color filter of the light emitting diode, a predetermined color of light-emitting diodes other than blue even for other light emitting diode can be used.
In the above description, the value of predetermined ratio in the LUT, PSF data configuration has been described for previously storing a predetermined data, such as tone characteristic data γ Data and light emitting diodes, the present invention is to is not limited, for example, it may be stored each of these data to a separate LUT.
Further, in the description of the second embodiment has described case where the storage unit for storing a plurality of types of predetermined ratio by the LUT and the LUT value change processing unit, a storage unit of the present invention is limited to not intended to be, it is also possible to use other storage devices such as a semiconductor memory or a hard disk drive.
Further, in the description of the second embodiment, and the storage unit in the LUT value change processing unit, based on an instruction signal from the external, one type of the predetermined plurality of types of predetermined ratios stored in the storage unit select the ratio has been described for the case where a impart a function of a selection instruction unit for outputting to the lighting control unit, the present invention is not limited to this, separate the selection instruction unit and storage unit it may be configured to.
The present invention, even when performing area active drive, it is useful for a display device capable of improving display quality.
A backlight unit having a light emitting portion for emitting illumination light, using said illumination light from the backlight unit, comprising the information display device having a color display can configured the display unit,
The lighting control unit, in each of the plurality of illumination areas, it is determined that the luminance signal value instructed for the predetermined color of the light source is greater than the luminance signal value instructed for other light sources, and determine that the value obtained by multiplying a predetermined ratio to the luminance signal value instructed for the predetermined color of the light source, which is the luminance signal value or a value instructed to the other light sources when, by using the luminance signal value instructed for the predetermined color of the light source, and turns operating the other light sources,
Display device characterized by.
Wherein the display unit includes a plurality of display areas which light from the plurality of illumination areas is incident respectively are set,
Wherein the display control unit uses the luminance value of the illumination each area from the lighting control unit corrects an input video signal, and pixel drive control of the display unit based on a video signal after correction the display device according to claim 1 carried out.
Wherein the display control unit uses the data of the preset PSF (point spread function), the display device according to claim 2 for correcting the luminance value of the illumination each area from the lighting control unit.
Said light source, a display device according to any one of claims 1 to 3, the light emitting diode is used.
It said light source, red, green, and red respectively emitting blue light, green, and blue light emitting diodes are used,
The lighting control unit, in each of the plurality of illumination areas, it is determined that the luminance signal value instructed for the blue light-emitting diode is greater than the luminance signal value instructed for the light emitting diode of the green and that the value which the multiplied by a predetermined ratio to the luminance signal value instructed for the blue light source, which is the luminance signal value or a value instructed to the light emitting diode of the green when it is determined, by using the luminance signal value instructed for the blue light-emitting diode display device according to any one of claims 1 to 4 for lighting operation the green light-emitting diode.
Wherein the lighting control unit, on the basis of the predetermined CF characteristics and predetermined emission characteristics of the light source of the color filter, predetermined according to any one of the predetermined claims ratio is used 1-5 of the display device.
With a storage unit for storing a plurality of types the predetermined ratio,
Based on the instruction signal from the outside, the said stored in the storage unit a plurality of types of selecting a predetermined ratio of one type from a predetermined ratio, selection instructing unit is provided to be output to the lighting control unit display device according to any one of claims 1 to 6 are.
The instruction signal is, the display device according to claim 7 which is a display mode indication signal for designating a display mode in the display unit.
PCT/JP2008/068304 2008-02-14 2008-10-08 Display device WO2009101727A1 (en)
JP2008-033213 2008-02-14
JP2009553333A JP4714297B2 (en) 2008-02-14 2008-10-08 Display device
CN 200880126528 CN101939691B (en) 2008-02-14 2008-10-08 Display device
EP20080872484 EP2246731A4 (en) 2008-02-14 2008-10-08 Display device
US12867691 US20100309107A1 (en) 2008-02-14 2008-10-08 Display device
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EP2246731A1 (en) 2010-11-03 application
US20100309107A1 (en) 2010-12-09 application
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JP4714297B2 (en) 2011-06-29 grant
RU2443006C1 (en) 2012-02-20 grant
CN101939691B (en) 2012-06-20 grant
JPWO2009101727A1 (en) 2011-06-02 application
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