CN101303839A - Liquid crystal display device and image display method thereof - Google Patents
Liquid crystal display device and image display method thereof Download PDFInfo
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Abstract
A backlight device is divided into multiple regions, and has a configuration in which light emitted from a light source of each of the regions is allowed to leak to other regions. A maximum gradation detector detects a maximum gradation of a regional image signal displayed on each of the regions of the liquid crystal panel. An image gain calculator obtains a gain to be multiplied to each regional image signal. An emission luminance calculator obtains an emission luminance of light to be emitted by each light source, by using an operation expression according to the emission luminance of light to be emitted by the backlight device. At this time, if the emission luminance takes a negative value as a result of calculation, the emission luminance calculator makes a correction so that the emission luminance can take a value equal to or greater than 0.
Description
Technical field
The present invention relates to a kind of liquid crystal indicator with back lighting device, and the control back lighting device in luminosity backlight and the image display method of show image signal.
Background technology
In the liquid crystal indicator that uses the liquid crystal panel display image, liquid crystal panel self is not luminous, therefore at for example back side of liquid crystal panel back lighting device is set.Liquid crystal panel can be in cut-off state that light is blocked and the conducting state that makes light transmission by state that does not apply voltage and the state that applies voltage.Therefore, by control a plurality of pixels that are provided with on the liquid crystal panel are applied the state of voltage, thereby drive a plurality of pixels in the mode of electronic shutter, to controlling from the light quantity of the light transmission liquid crystal panel that sends backlight, thus display image.
Backlight as what on back lighting device, use, be main flow with cold-cathode tube (CCFL (ColdCathode Fluorescent Lamp)) in the past, in the back lighting device that uses CCFL, it is general no matter the lightness of the signal of video signal that shows on the liquid crystal panel how, all makes CCFL be in constant illuminating state.
In the electric power that liquid crystal indicator consumes, the shared ratio of the consumption electric power of back lighting device is big, in the existing liquid crystal indicator that is in constant illuminating state all the time backlight, has the big problem of electric power that consumes.In order to address this problem, proposed various with light emitting diode (LED (Light Emitting Diode)) as backlight, and can change the scheme of the luminosity of LED according to the lightness of signal of video signal.
For example disclose in following non-patent literature 1 and patent documentation 1～3, the back lighting device that will have a plurality of LED is divided into a plurality of zones, and controls luminosity backlight according to the lightness of signal of video signal respectively according to each zone.In addition, in non-patent literature 1, this technology is called self-adaptation light modulation (Adaptive Dimming).
Non-patent literature 1:T.Shirai, S.Shimizukawa, T.Shiga, and S.Mikoshiba, 44.4:RGB-LED Backlights for LCD-TVs with 0D, 1D, and 2DAdaptive Dimming, 1520 SID, 06 DIGEST
Patent documentation 1: the open 2005-258403 communique of Jap.P.
Patent documentation 2: the open 2006-30588 communique of Jap.P.
Patent documentation 3: the open 2006-145886 communique of Jap.P.
In the existing liquid crystal indicator of in above-mentioned non-patent literature 1, putting down in writing, the be blocked wall of light of each zone that is divided into the back lighting device in a plurality of zones separates, each zone backlight, according to each zone respectively under state fully independently, according to the lightness control luminosity of signal of video signal.The predominant wavelength of the individuality of each element decision lightness and tone has deviation among the LED, and is also inequality for the degree of every kind of misalignment of red (R), green (G), blue (B).Therefore, if each zone of back lighting device is separated each other fully, then lightness and tone produce deviation on each zone, and there is the different problem of state of the image that shows on the liquid crystal panel and original image in its result.
Lightness and the emission wavelength of LED have temperature dependency, and particularly the LED of R is accompanied by the temperature rising of element, and light quantity reduces, and wavelength is elongated.In addition, the characteristic difference of the deterioration element of each R, G, B, that cause by the variation that produces in time.Therefore, the problems referred to above are according to the temperature variation of the element of LED or the variation that produces in time and significantly producing.
With each zone fully in the separated structures, be difficult to determine which zone is the pixel that is positioned at the top, border of adjacent area belong to.This be because, the making precision of back lighting device is compared very coarse with the making precision of liquid crystal panel.Therefore can't adopt the structure of record in the above-mentioned non-patent literature 1 at all.
In addition, record as above-mentioned non-patent literature 1 or above-mentioned patent documentation 1～3, by adopting back lighting device is divided into a plurality of zones, and control the structure of luminosity backlight respectively according to each zone according to the lightness of signal of video signal, can cut down consumption electric power, consume electric power but require further to cut down.
Summary of the invention
The present invention considers the problems referred to above point, the image display method that its purpose is to provide a kind of liquid crystal indicator and is used for this device, back lighting device is being divided into a plurality of zones, and according to the lightness of signal of video signal, control respectively according to each zone under the situation of luminosity backlight, the lightness separately of each zone or the deviation of tone can be suppressed, the quality of the image that shows on the liquid crystal panel can be improved.In addition, its purpose is to provide a kind of liquid crystal indicator of the consumption electric power that can further cut down back lighting device and is used for the image display method of this device.
The present invention in order to solve the problem of above-mentioned prior art, provides a kind of liquid crystal indicator, it is characterized in that comprising: liquid crystal panel (34), show image signal; Back lighting device (35), be configured in the rear side of above-mentioned liquid crystal panel, be divided into a plurality of zones, above-mentioned a plurality of zone has the light source of light that sends the above-mentioned liquid crystal panel of irradiation respectively, and has light that permission sends from above-mentioned a plurality of zones light source separately and escape to other regional structures beyond the self zone; Maximum gray scale detection portion (11), according to each predetermined unit interval, on a plurality of zones of the above-mentioned liquid crystal panel corresponding with a plurality of zones of above-mentioned back lighting device respectively the first maximum gray scale of each regional signal of video signal of demonstration detect; Image gain operational part (12), try to achieve and the suitable value of value that obtains divided by the above-mentioned first maximum gray scale with the second maximum gray scale, as the gain to the signal of video signal of each above-mentioned zone, the wherein said second maximum gray scale is obtained by the above-mentioned signal of video signal of the figure place decision of above-mentioned signal of video signal; Multiplier (14) multiply by the above-mentioned gain of being tried to achieve by above-mentioned image gain operational part with the signal of video signal of each above-mentioned zone, as the signal of video signal output that shows on the above-mentioned liquid crystal panel; And luminosity operational part (22), be made as high-high brightness with above-mentioned light source in the brightness of the light that will the above-mentioned a plurality of zones from above-mentioned back lighting device sends respectively and multiply by first luminosity that the inverse of the above-mentioned gain of being tried to achieve by above-mentioned image gain operational part obtains, and be to obtain this first luminosity and the brightness of the light that should send separately respectively when being made as second luminosity with the light source in the above-mentioned a plurality of zones in the above-mentioned back lighting device, utilize the arithmetic expression that multiply by first coefficient with above-mentioned first luminosity, when trying to achieve above-mentioned second luminosity, on above-mentioned second luminosity is calculating is under the situation of negative value, so that after the mode that above-mentioned second luminosity is the value more than 0 proofreaies and correct above-mentioned first luminosity, try to achieve above-mentioned second luminosity, wherein above-mentioned first coefficient escapes to self zone other regional light quantities in addition based on the light that sends from above-mentioned a plurality of zones light source separately.
At this, preferred, above-mentioned image gain operational part according to above-mentioned first luminosity of having been proofreaied and correct by above-mentioned luminosity operational part, is tried to achieve above-mentioned gain.
In addition, preferred, above-mentioned arithmetic expression is the matrix operation formula.
In said structure, preferred, a plurality of zones of above-mentioned liquid crystal panel are the zones with the one dimension division in vertical direction of above-mentioned liquid crystal panel.
At this moment, preferably include non-homogeneous handling part (21), a plurality of zones above-mentioned first luminosity separately with above-mentioned back lighting device multiply by second coefficient, above-mentioned first luminosity is become inhomogeneous, so that the zone of the central portion of the vertical direction that is positioned at a plurality of zones that one dimension arranges from above-mentioned liquid crystal panel begins till the zone that is positioned at upper and lower end parts, the luminance step scalariform ground on the above-mentioned liquid crystal panel reduces.
In addition, preferred in said structure, a plurality of zones of above-mentioned liquid crystal panel are above-mentioned liquid crystal panel to be reached the vertical direction both sides in the horizontal direction go up the zone of dividing by two dimension.
At this moment, preferably include non-homogeneous handling part (21), a plurality of zones above-mentioned first luminosity separately with above-mentioned back lighting device multiply by second coefficient, above-mentioned first luminosity is become inhomogeneous, so that the zone of the central portion of the horizontal direction in a plurality of zones that are positioned at two-dimensional arrangements from above-mentioned liquid crystal panel begins till the zone that is positioned at left and right end portions, luminance step scalariform ground on the above-mentioned liquid crystal panel reduces, and begin till the zone that is positioned at upper and lower end parts from the zone of the central portion that is positioned at vertical direction, the luminance step scalariform ground on the above-mentioned liquid crystal panel reduces.
Preferably, above-mentioned second coefficient is the value more than 0.8, below 1.0.
Preferably, the above-mentioned light source of above-mentioned back lighting device is a light emitting diode.
And then, the present invention is in order to solve the problem of above-mentioned prior art, a kind of image display method is provided, it is characterized in that, the signal of video signal that shows on the liquid crystal panel is made as and each corresponding regional signal of video signal of a plurality of zones of setting on above-mentioned liquid crystal panel, and according to each predetermined unit interval, the first maximum gray scale to each regional signal of video signal of showing respectively on above-mentioned a plurality of zones detects, try to achieve and the suitable value of value that obtains divided by the above-mentioned first maximum gray scale with the second maximum gray scale, as gain to the signal of video signal of each above-mentioned zone, the wherein said second maximum gray scale is obtained by the above-mentioned signal of video signal of the figure place decision of above-mentioned signal of video signal, signal of video signal with each above-mentioned zone multiply by above-mentioned gain, and supply to above-mentioned liquid crystal panel, a plurality of zones of the back lighting device of above-mentioned liquid crystal panel and above-mentioned liquid crystal panel are divided into a plurality of zones accordingly, be made as high-high brightness with above-mentioned light source in the brightness of the light that will the above-mentioned a plurality of zones light source separately from above-mentioned back lighting device sends and multiply by first luminosity that the inverse of above-mentioned gain obtains, and be to obtain this first luminosity and the brightness of the light that should send separately respectively when being made as second luminosity with the light source in the above-mentioned a plurality of zones in the above-mentioned back lighting device, utilize the arithmetic expression that multiply by first coefficient with above-mentioned first luminosity, try to achieve above-mentioned second luminosity, wherein above-mentioned first coefficient escapes to self zone other regional light quantities in addition based on the light that sends from above-mentioned a plurality of zones light source separately, at this moment, on above-mentioned second luminosity is calculating is under the situation of negative value, so that the mode that above-mentioned second luminosity is the value more than 0 is tried to achieve above-mentioned second luminosity after above-mentioned first luminosity is proofreaied and correct, make above-mentioned a plurality of zones light source separately in the above-mentioned back lighting device luminous the time, on a plurality of zones of above-mentioned liquid crystal panel, show the signal of video signal of each above-mentioned zone that multiply by above-mentioned gain respectively with above-mentioned second luminosity.
At this, preferred, try to achieve above-mentioned gain according to above-mentioned first luminosity of having proofreaied and correct.
In addition, preferred, above-mentioned arithmetic expression is the matrix operation formula.
In said structure, preferred, a plurality of zones of above-mentioned liquid crystal panel are the zones with the one dimension division in vertical direction of above-mentioned liquid crystal panel.
At this moment, preferably, a plurality of zones above-mentioned first luminosity separately with above-mentioned back lighting device multiply by second coefficient, above-mentioned first luminosity is become inhomogeneous, so that the zone of the central portion of the vertical direction that is positioned at a plurality of zones that one dimension arranges from above-mentioned liquid crystal panel begins till the zone that is positioned at upper and lower end parts, the luminance step scalariform ground on the above-mentioned liquid crystal panel reduces.
In addition, preferred in said structure, a plurality of zones of above-mentioned liquid crystal panel are above-mentioned liquid crystal panel to be reached the vertical direction both sides in the horizontal direction go up the zone that two dimension is divided.
At this moment, preferably, a plurality of zones above-mentioned first luminosity separately with above-mentioned back lighting device multiply by second coefficient, above-mentioned first luminosity is become inhomogeneous, so that the zone of the central portion of the horizontal direction in a plurality of zones that are positioned at two-dimensional arrangements from above-mentioned liquid crystal panel begins till the zone that is positioned at left and right end portions, luminance step scalariform ground on the above-mentioned liquid crystal panel reduces, and begin till the zone that is positioned at upper and lower end parts from the zone of the central portion that is positioned at vertical direction, the luminance step scalariform ground on the above-mentioned liquid crystal panel reduces.
Preferably, above-mentioned second coefficient is the value more than 0.8, below 1.0.
Preferably, the above-mentioned light source of above-mentioned back lighting device is a light emitting diode, and the drive signal by having carried out pulse-length modulation according to above-mentioned second luminosity, and above-mentioned light source is driven.
According to liquid crystal indicator of the present invention and be used for the image display method of this device, back lighting device is being divided into a plurality of zones, and according to the lightness of signal of video signal, control respectively according to each zone under the situation of luminosity backlight, the lightness separately of each zone or the deviation of tone can be suppressed, the quality of the image that shows on the liquid crystal panel can be improved.In addition, making under the uneven situation of first luminosity, can further cut down the consumption electric power of back lighting device.
Description of drawings
Fig. 1 is the integrally-built block diagram of the liquid crystal indicator that relates to of expression first embodiment of the present invention.
Fig. 2 is the skeleton view of the corresponding relation in the summary zone of representing the zone of liquid crystal panel 34 and back lighting device 35.
Fig. 3 is the figure that is used to illustrate the calculating process of the gain of being tried to achieve by image gain operational part 12.
Fig. 4 is the figure of first structure example of expression back lighting device 35.
Fig. 5 is the figure of second structure example of expression back lighting device 35.
Fig. 6 is the vertical view of structure example of the light source 352 of expression back lighting device 35.
Fig. 7 is the figure of example of Region Segmentation of the two dimension of expression back lighting device 35.
Fig. 8 is the figure of non-homogeneousization processing that is used for the non-homogeneousization handling part 21 of key diagram 1.
Fig. 9 is the figure of light leak that is used for illustrating the zone of back lighting device 35.
Figure 10 is the figure of the brightness on each zone when lighting separately, each zone of expression back lighting device 35.
Figure 11 is the figure of the matrix operation formula used in first～the 4th embodiment during with back lighting device 35 one dimension cut zone of expression.
Figure 12 is the figure of the matrix operation formula used in first～the 4th embodiment during with back lighting device 35 one dimension cut zone of expression.
Figure 13 is the figure of expression with the general matrix operation formula of matrix operation formula of Figure 11, Figure 12.
Figure 14 is the figure of the light leak when representing back lighting device 35 two-dimentional cut zone.
Figure 15 is the figure of the matrix operation formula used in first～the 4th embodiment during with back lighting device 35 two-dimentional cut zone of expression.
Figure 16 is the figure of the matrix operation formula used in first～the 4th embodiment during with back lighting device 35 two-dimentional cut zone of expression.
Figure 17 is the figure of expression with the general matrix operation formula of matrix operation formula of Figure 15, Figure 16.
Figure 18 is the process flow diagram of the step of the action of the liquid crystal indicator that relates to of expression first embodiment of the present invention and image display method.
Figure 19 is the process flow diagram of variation of the step of the action of the liquid crystal indicator that relates to of expression first embodiment of the present invention and image display method.
Figure 20 is the process flow diagram of other variation of the step of the action of the liquid crystal indicator that relates to of expression first embodiment of the present invention and image display method.
Figure 21 is the integrally-built block diagram of the liquid crystal indicator that relates to of expression second embodiment of the present invention.
Figure 22 is the figure that is used to illustrate second embodiment of the present invention.
Figure 23 is the figure that expression is converted to the luminosity of light source the matrix operation formula of luminous quantity.
Figure 24 is the figure of the calculating formula of the expression matrix operation formula that is used to illustrate Figure 23.
Figure 25 is the figure that expression is converted to the luminosity of light source the matrix operation formula of luminous quantity.
Figure 26 is the integrally-built block diagram of the liquid crystal indicator that relates to of expression the 3rd embodiment of the present invention.
Figure 27 is the figure that is used to illustrate the 3rd embodiment of the present invention.
Figure 28 is the figure of correction that is used for illustrating the luminosity of the 3rd embodiment of the present invention.
Figure 29 is the figure of correction that is used for illustrating the luminosity of the 3rd embodiment of the present invention.
Figure 30 is the performance plot of the liquid crystal indicator that is used to illustrate that the 4th embodiment of the present invention relates to.
Figure 31 is the performance plot of the liquid crystal indicator that is used to illustrate that the 4th embodiment of the present invention relates to.
Figure 32 is the performance plot of the liquid crystal indicator that is used to illustrate that the 4th embodiment of the present invention relates to.
Figure 33 is the performance plot of attenuation coefficient k and the relation that consumes the electric power relative value in the liquid crystal indicator that relates to of expression the 4th embodiment of the present invention.
Embodiment
First embodiment
Below, with reference to accompanying drawing, liquid crystal indicator that first embodiment of the present invention is related to and the image display method that is used for this device describe.Fig. 1 is the integrally-built block diagram of the liquid crystal indicator that relates to of expression first embodiment of the present invention.In Fig. 1, the signal of video signal that shows on the liquid crystal panel 34 in aftermentioned Liquid Crystal Module portion 30 is fed into maximum gray scale detection portion 11 and the frame memory 13 in the signal of video signal handling part 10.As explanation hereinafter, back lighting device 35 is divided into a plurality of zones, and liquid crystal panel 34 is divided into a plurality of zones accordingly with each zone of back lighting device 35, and according to each zone of liquid crystal panel 34, lightness backlight (light quantity) is controlled respectively.
Fig. 2 is an example of the Region Segmentation on liquid crystal panel 34 and the back lighting device 35, is the skeleton view of the corresponding relation in the summary zone of representing the zone of liquid crystal panel 34 and back lighting device 35.At this,, be configured such that the state that liquid crystal panel 34 separates with back lighting device 35 for easy understanding.As shown in Figure 2, back lighting device 35 is divided into regional 35a～35d, and regional 35a～35d has backlight respectively.Liquid crystal panel 34 for example has a plurality of pixels that are made of horizontal direction 1920 pixels, vertical direction 1080 pixels, and this has the liquid crystal panel 34 of a plurality of pixels and the regional 35a～35d of back lighting device 35 is divided into regional 34a～34d accordingly.In this example, liquid crystal panel 34 is divided into four regional 34a～34d by one dimension in vertical direction, and therefore 270 pixels of vertical direction are contained in a zone.Certainly, on the pixel quantity of vertical direction, also can how much there be deviation among four regional 34a～34d.
Regional 34a～34d on the liquid crystal panel 34 divides each regional physical separation, (is regional 34a～34d) at this but be set with a plurality of zones on liquid crystal panel 34.And, the signal of video signal of supplying with to liquid crystal panel 34, with a plurality of zones of setting on the liquid crystal panel 34 accordingly, processed as each regional signal of video signal that these a plurality of zones show separately.In a plurality of zones of setting on liquid crystal panel 34, lightness backlight is controlled separately respectively.
In example shown in Figure 2, liquid crystal panel 34 is divided into four zones in vertical direction, therewith accordingly, back lighting device 35 is divided into four zones in vertical direction, be more zone but also can divide (differentiation).In addition, as described later, also liquid crystal panel 34 can be divided into a plurality of zones on vertical direction and horizontal direction both sides, and therewith accordingly, back lighting device 35 be divided into a plurality of zones on vertical direction and horizontal direction both sides.The region quantity of preferred division (differentiation) is many, compares with only dividing (differentiation) in vertical direction, preferably divides on vertical direction and horizontal direction both sides (differentiation).At this,, be divided into the action of routine key diagram 1 with four of vertical direction shown in Figure 2 for simplification will be described.
Return Fig. 1, maximum gray scale detection portion 11 is detected the maximum gray scale of the signal of video signal of the last demonstration of each regional 34a～34d of liquid crystal panel 34 respectively according to each frame of signal of video signal.Preferably each frame according to signal of video signal detects maximum gray scale, but also can according to circumstances detect respectively according to per two frames, detects maximum gray scale respectively according to each predetermined unit interval and gets final product.The data of the maximum gray scale of each the regional 34a～34d of expression that is detected by maximum gray scale detection portion 11 supply to images gain operational part 12 in the signal of video signal handling part 10 and the non-homogeneousization handling part 21 in the backlight illumination control part 20.The gain that the signal of video signal of image gain operational part 12 calculating as follows and the last demonstration of regional 34a～34d multiplies each other.
Fig. 3 is the figure that is used to illustrate the calculating process of the gain of being tried to achieve by image gain operational part 12.Try to achieve respectively according to each signal of video signal that each the regional 34a～34d to liquid crystal panel 34 supplies with the gain that signal of video signal multiplies each other.Therefore, the below computing of Shuo Ming gain, subtend zone each signal of video signal that 34a～34d supplies with carries out.In addition, in Fig. 3, the input signal that transverse axis is represented (signal of video signal) is 8, and the expression input signal is got the situation of the value of gray scale 0～255.In addition, the display brightness (display gray scale) of the liquid crystal panel 34 that the longitudinal axis is represented is ignored the transmitance of liquid crystal panel 34, and gets 0～255 value for convenience and describe.The figure place of signal of video signal is not limited to 8, for example also can be 10.
Curve C v1 shown in Fig. 3 (A) represents gray scale is that 0～255 input signal with what kind of display brightness is presented on the liquid crystal panel 34.Curve C v1 is is x at transverse axis, when the longitudinal axis is y, y is the gamma curve that is commonly referred to as gamma 2.2～2.4 by the curve that 2.2 powers～2.4 times tables show of x.According to the kind of liquid crystal panel 34, there is the different situation of gamma curve Cv1 of Fig. 3 (A).
At this, as an example, shown in Fig. 3 (B), consider that the maximum gray scale of input signal is 127, input signal is got the situation of the value of gray scale 0～127.The display brightness of the liquid crystal panel 34 of this moment becomes the curve of being represented by curve C v2, and display brightness is got 0～56 value.At this moment, think that the gray scale 255 with high-high brightness backlight is luminous.High-high brightness backlight is meant, when signal of video signal is maximum gray scale 255 (i.e. white), and the brightness that should send backlight.If the signal of video signal of representing with curve C v2 among Fig. 3 (B) multiply by about 4.5 gain, then become the curve C v3 shown in Fig. 3 (C).It is to obtain by 255/56 that gain gets about 4.5.Under the state of Fig. 3 (C), also think backlight luminous with high-high brightness.
Under this state, the signal of video signal with characteristic of being represented by curve C v3 is not the original signal of video signal with characteristic of being represented by curve C v2 among Fig. 3 (B), in addition, and the electric power that consumes backlight meaninglessly.Therefore, as if about 1/4.5 times that luminosity backlight is made as high-high brightness, then shown in Fig. 3 (D), the curve C v3 of display brightness 0～255 becomes the curve C v4 of display brightness 0～56.Thus, the signal of video signal with characteristic of being represented by curve C v4 is of equal value in fact with the original signal of video signal with characteristic of being represented by curve C v2, and consumption electric power backlight reduces.
Promptly, be made as Gmax1 as if the maximum gray scale in 1 image duration of the signal of video signal that will show respectively on regional 34a～34d, to be made as Gmax0 by the obtained maximum gray scale of signal of video signal of the figure place of signal of video signal decision, then image gain operational part 12 gain that the Gmax0/Gmax1 of each regional 34a～34d is multiplied each other as the signal of video signal with the last demonstration of regional 34a～34d.Gmax1/Gmax0 as the inverse of gain G max0/Gmax1 in backlight illumination control part 20, uses when controlling brightness backlight.If the pattern difference of the signal of video signal of the last demonstration of regional 34a～34d, then regional 34a～34d maximum gray scale Gmax1 separately is different certainly, so Gmax0/Gmax1 has nothing in common with each other on regional 34a～34d.Structure and action to backlight illumination control part 20 is elaborated later.
In Fig. 1, the gain of each the regional 34a～34d that is obtained by image gain operational part 12 is imported into multiplier 14.The signal of video signal that regional 34a～34d that multiplier 14 usefulness are exported from frame memory 13 shows multiply by gain and output separately.
Be fed into the sequential control portion 31 of Liquid Crystal Module portion 30 from the signal of video signal of multiplier 14 outputs.Liquid crystal panel 34 has above-mentioned a plurality of pixel 341, is connected with data signal line drive division 32 on the data signal line of pixel 341, is connected with signal line drive division 33 on the signal line.The signal of video signal that is imported into sequential control portion 31 is fed into data signal line drive division 32.Sequential control portion 31 is by data signal line drive division 32 and signal line drive division 33, and control writes signal of video signal the sequential of liquid crystal panel 34.The pixel data that constitutes each row of the signal of video signal that is input in the data signal line drive division 32 passes through the driving of 33 pairs of signal lines of signal line drive division, is written to the pixel of each row line by line successively.Thus, each frame of signal of video signal is presented on the liquid crystal panel 34 successively.
At this, the concrete structure example of back lighting device 35 is described.Fig. 4 and Fig. 2 similarly represent back lighting device 35 is divided in vertical direction the example in four zones.First structure example of back lighting device shown in Figure 4 35 is called back lighting device 35A, and second structure example of the back lighting device 35 that aftermentioned is shown in Figure 5 is called back lighting device 35B.In addition, back lighting device 35 is general designations of back lighting device 35A, 35B and other structure example.Fig. 4 (A) is the vertical view of back lighting device 35A, and Fig. 4 (B) is the sectional view of expression state that back lighting device 35A is blocked in vertical direction.
Shown in Fig. 4 (A), (B), back lighting device 35A makes light source backlight 352 arrange in the horizontal direction and the structure of installing having on the rectangle framework 351 of the predetermined degree of depth.Light source 352 for example is LED.Zone 35a～35d is divided with the predetermined height outstanding differentiation wall 353 higher than the upper space (top) of light source 352 each other by the bottom surface from framework 351.The surface inboard and differentiation wall 353 of framework 351 is covered by reflector plate.
On the top of framework 351 diffuser plate 354 that makes the light diffusion is installed, three optical sheet classes 355 for example are installed on diffuser plate 354.Optical sheet class 355 is diffusion sheet, prismatic lens (Prism Sheet) that will light be spread and the parts that are called as a plurality of combinations such as brightness rising film of DBEF (Dual Brightness EnhancementFilm).The height no show of the differentiation wall 353 that is made of reflector plate is to diffuser plate 354, and therefore regional 35a～35d separates fully, is not state completely independent from one another.That is, in back lighting device 35A, the light that its structure allows to send from regional 35a～35d light source 352 separately escapes to other zones.Shown in hereinafter describing in detail, in the first embodiment, consider to escape to other regional light quantities from each regional 35a～35d, the brightness of the light that sends from regional 35a～35d is controlled.
Fig. 5 is illustrated in liquid crystal panel 34 is divided into four zones in vertical direction, and then is divided into four in the horizontal direction when regional, promptly liquid crystal panel 34 two dimensions is being divided into 16 back lighting device 35B as second structure example of back lighting device 35 when regional.Fig. 5 (A) is the vertical view of back lighting device 35B, and Fig. 5 (B) is the sectional view of expression state that back lighting device 35B is blocked in vertical direction, the sectional view of Fig. 5 (C) state that to be expression block back lighting device 35B in the horizontal direction.At this, the state that the row in the zone, left part of Fig. 5 (A) are blocked in Fig. 5 (B) expression, the state that the row of the upper end region of Fig. 5 (A) is blocked in Fig. 5 (C) expression.In addition, in Fig. 5, the part identical with Fig. 4 is marked with same label, and suitably omits its explanation.
LED is the high light source of directive property, and therefore when LED was used as light source 352, the differentiation wall 353 that the sheet that is reflected covers can be lower than the state of Fig. 4, Fig. 5 record, according to circumstances also can remove.Also can be by cover the element of light source 352 by dome-type lens, obtain the effect identical with setting area bulkhead 353.As light source backlight, also can be the light source beyond the LED, also can use CCFL or external electrode fluorescent lamp other light sources such as (EEFL).But LED controls luminosity and light-emitting area easily, therefore as the light source 352 that uses in the first embodiment, and preferred LED.The concrete structure of back lighting device 35 is not limited to Fig. 4 or structure shown in Figure 5.
Fig. 4, light source 352 formations specific as follows shown in Figure 5.First structure example of the light source 352 shown in Fig. 6 (A), the LED 357G with LED 357B, the G of LED 357R, the B of LED 357G, the R of G on substrate 356 installs in proper order with this.Substrate 356 for example is aluminium base or glass epoxy substrate.Fig. 4, light source 352 shown in Figure 5 are equivalent to make the light source 352 of a plurality of these Fig. 6 (A) to be arranged as a light source that is listed as.Second structure example of the light source 352 shown in Fig. 6 (B), the LED 357G with LED 357B, the G of LED 357G, the B of LED 357R, the G of R on substrate 356 is installed as rhombus.Fig. 4, light source 352 shown in Figure 5 are equivalent to make the light source 352 of a plurality of these Fig. 6 (B) to be arranged as a light source that is listed as.
The 3rd structure example of the light source 352 shown in Fig. 6 (C) is equipped with the led chip 358 of LED 357B of LED 357G, B that 12 one have LED 357R, the G of R on substrate 356.Fig. 4, light source 352 shown in Figure 5 are equivalent to make the light source 352 of a plurality of these Fig. 6 (C) to be arranged as the light source of row.The 4th structure example of the light source 3 52 shown in Fig. 6 (D) is equipped with the LED 357W of two white (W) on substrate 356.Fig. 4, light source 352 shown in Figure 5 are equivalent to make the light source 352 of a plurality of these Fig. 6 (D) to be arranged as the light source of row.In addition, as LED 357W, following type is arranged: use the light that obtains white from the fluorophor of the optical excitation yellow of the LED of B radiation; With use ultraviolet ray excited R, the G from LED radiation, the fluorophor of B to obtain the light of white, can be any type wherein.
Next, return Fig. 1, the structure and the action of backlight illumination control part 20 described.Backlight illumination control part 20 also has luminosity operational part 22, white balance adjustment part 23, reaches PWM timing sequence generating portion 24 except non-homogeneousization handling part 21., describe as back lighting device 35 also in order to simplify at this with back lighting device 35A shown in Figure 4.If high-high brightness backlight is made as Bmax, then the regional 35a～35d of back lighting device 35 brightness that should send backlight separately gets final product for multiply by the Gmax1/Gmax0 that tries to achieve respectively according to each regional 34a～34d with high-high brightness Bmax.Like this, non-homogeneousization handling part 21 is tried to achieve the brightness B that should send backlight of regional 35a～35d
1～B
4
Luminosity B on this calculates
1～B
4, not the brightness directly over the light source 352 when luminous as light source backlight 352, but the brightness of the light that sends from back lighting device 35.That is, in the structure example of Fig. 4, Fig. 5, luminosity B
1～B
4Brightness for optical sheet class 355 tops.In addition, the luminosity in the calculating that will should send from a zone of back lighting device 35 is referred to as B.In the following description, the Luminance Distribution of establishing the light that sends from the regional 35a～35d of back lighting device is roughly the same and describe in each zone, and the different situation of Luminance Distribution in a zone is still also arranged.At this moment, the lightness on the arbitrfary point in zone is luminosity B
1～B
4Get final product.
In the past, the gray scale of the signal of video signal all as if regional 34a～34d was identical, then the luminosity B of regional 35a～35d
1～B
4All identical.That is the luminosity B that will calculate this moment,
1～B
4Directly as actual luminosity.Relative therewith, in the first embodiment, the luminosity B that non-homogeneousization handling part 21 will calculate
1～B
4Multiply by non-homogeneousization coefficient p
1～p
4, will become p from the brightness of the actual light that sends of regional 35a～35d
1B
1, p
2B
2, p
3B
3, p
4B
4Coefficient p
1～p
4For greater than the value below 0,1.The inventor finds, with on the whole image of liquid crystal panel 34, make the luminosity that directly sends in the calculating backlight and compare, make backlightly with the luminosity that reduces some than the luminosity on calculating when luminous at the picture periphery, the quality of the image that shows on the liquid crystal panel 34 improves.
Therefore, in the regional one dimension with back lighting device 35 is divided into four parts the example of Fig. 4, preferably make luminosity B from regional 35a, 35d corresponding in regional 35a～35d with the upper and lower end parts of picture
1, B
4Recently from the luminosity B of regional 35b, 35c
2, B
3Low.Particularly, as an example, with p
1Be made as 0.8, with p
2, p
3Be made as 1, with p
4Be made as 0.8.
Under the complete white state of display white on the whole liquid crystal panel 34, if the brightness of regional 34b, the 34c of liquid crystal panel 34 is 500[cd/m
2], then on regional 34a, 34d 400[cd/m
2].Therefore, the consumption electric power on regional 35a, the 35d of back lighting device 35 can cut down 20%.Like this, in the first embodiment,, can not reduce the quality of the image that shows on the liquid crystal panel 34, quality be improved, and can cut down the consumption electric power of back lighting device 35 by non-homogeneousization handling part 21 is set.Consider the quality of image and this two aspect of reduction that consumes electric power, coefficient p
1～p
4Preferably more than 0.8, below 1.0.That is, the coefficient p that will multiply each other with luminosity backlight at the picture central part is made as 1, in the picture periphery will be set in scope till lower limit is 0.8 with the coefficient p that luminosity multiplies each other.
And then the non-homogeneousization coefficient p to liquid crystal panel 34 and back lighting device 35 two-dimentional cut zone the time describes.At this, be example to reach the situation that is divided into eight zones on the vertical direction both sides in the horizontal direction, promptly the situation that is divided into 64 zones with two dimension is an example.As shown in Figure 7, the zone of Ci Shi back lighting device 35 is 35a1～35a8,35b1～35b8,35c1～35c8,35d1～35d8,35e1～35e8,35f1～35f8,35g1～35g8,35h1～35h8.Though illustrate especially, liquid crystal panel 34 is divided into 64 zones accordingly with 64 zones of back lighting device 35.
Fig. 8 (A) be with 4 row regional 35c1～35c8,35d1～35d8 of the central portion of the vertical direction of back lighting device 35,8 zone calculating separately of horizontal direction on 35e1～35e8, the 35f1～35f8 on the example of the coefficient p that multiplies each other of luminosity.The left and right directions of Fig. 8 (A) is the position of horizontal direction, and the left side is the picture left part, and the right side is the picture right part.In this example, for 4 zones coefficient p is made as 1 as the central portion of horizontal direction, for the zone that is positioned at about it coefficient p is made as 0.9, for the zone of left and right end portions coefficient p is made as 0.8.
Preferred coefficient p reduces along with being 1 the central portion left and right end portions near picture from coefficient p successively steppedly.At this moment, preferred coefficient p left-right symmetric.At this, though the coefficient p on four zones of central portion is made as 1, but also the coefficient p on two zones of central portion can be made as 1, and from be positioned at two zones about the zone begin coefficient p to be reduced successively till the zone of left and right end portions in less than the scope till 1 the value to 0.8.In addition, cutting apart number when the odd number, coefficient p is that the zone of 1 horizontal direction also can only have one.The characteristic of the horizontal direction of coefficient p can suitably be set at and make on the picture of reality and to produce optimal image quality.
Fig. 8 (B) be with 4 column region 35a3～35h3 of the central portion of the horizontal direction of back lighting device 35,35a4～35h4,35a5～35h5,35a6～35h6 on 8 zone calculating separately of vertical direction on the example of the coefficient p that multiplies each other of luminosity.The left and right directions of Fig. 8 (B) is the position of vertical direction, and the left side is the picture upper end, and the right side is the picture bottom.In this example, for four zones coefficient p is made as 1 as the central portion of vertical direction, for being positioned at its zone up and down coefficient p is made as 0.9, for the zone of upper and lower end parts coefficient p is made as 0.8.
In vertical direction, also preferred coefficient p reduces along with being 1 the central portion upper and lower end parts near picture from coefficient p successively steppedly.At this moment, preferred coefficient p is symmetrical up and down.At this, though the coefficient p on four zones of central portion is made as 1, but also the coefficient p on two zones of central portion can be made as 1, and begin coefficient p to be reduced successively till the zone of upper and lower end parts in less than the scope till 1 the value to 0.8 from the zone up and down that is positioned at two zones.In addition, cutting apart number when the odd number, coefficient p is that the zone of 1 vertical direction also can only have one.The characteristic of the vertical direction of coefficient p can suitably be set at and make on the picture of reality and to produce optimal image quality.In addition, also can make the characteristic of horizontal direction of coefficient p different with the characteristic of vertical direction.
Like this, from the non-homogeneousization handling part 21 of Fig. 1, obtain representing the data of the luminosity of the light that in fact should send from each zone of back lighting device 35.Supply with the coefficient p that uses the non-homogeneousization handling part 21 from control part 50.Control part 50 can be made of microcomputer, and coefficient p can change arbitrarily.The data of representing this luminosity are imported into luminosity operational part 22, the brightness of the light that each light source 352 of following computing should send.At first, for having the back lighting device 35A of regional 35a～35d, and the luminosity of the light that in fact should send from regional 35a～35d is p to back lighting device 35
1B
1, p
2B
2, p
3B
3, p
4B
4The time the operational method of brightness of light source 352 light that should send describe.
Fig. 9 (A) is with the state of the horizontal commentaries on classics of sectional view of Fig. 4 (B), has omitted optical sheet class 355 at this.Luminosity from the light of regional 35a～35d is p
1B
1, p
2B
2, p
3B
3, p
4B
4, and establish p
1B
1=B
1', p
2B
2=B
2', p
3B
3=B
3', p
4B
4=B
4'.The luminosity B ' that puts on " ' " is meant the luminosity of having been implemented non-homogeneousization processing by non-homogeneousization handling part 21, and the luminosity B that does not put on " ' " is meant the luminosity of not implementing non-homogeneousization processing.Luminosity directly over the independent light source 352 when luminous of regional 35a～35d light source 352 separately is made as Bo
1, Bo
2, Bo
3, Bo
4As mentioned above, the light that allows to send from regional 35a～35d light source 352 separately escapes to other zones, so B
1', B
2', B
3', B
4' not with luminosity Bo
1, Bo
2, Bo
3, Bo
4Identical.In addition, the decay of the light that diffuser plate 354 or optical sheet class 355 cause is very weak, it is not considered.In addition, the luminosity directly over the independent light source 352 when luminous of the light source 352 in a zone of back lighting device 35 is referred to as Bo.
Shown in Fig. 9 (A), when all light source of regional 35a～35d 352 was luminous, the light that sends from each light source 352 became luminosity Bo
1, Bo
2, Bo
3, Bo
4K light leak L doubly
1Escape to adjacent areas.K is the attenuation coefficient of light when spilling, and is the value greater than 0, less than 1.Other regional light leaks beyond the subtend light-emitting zone are further analyzed.When Fig. 9 (B) expression only has the light source 352 of regional 35a luminous to the state of regional 35b～35d light leak.From the light source 352 of regional 35a with luminosity Bo
1The light that sends becomes brightness k Bo
1Light leak L
1, escape to regional 35b.Brightness k Bo
1Light leak L
1Further become k light leak doubly, therefore become k
2Bo
1Light leak L
2, escape to regional 35c.Brightness k
2Bo
1Light leak L
2Further become k light leak doubly, therefore become k
3Bo
1Light leak L
3, escape to regional 35d.
Under the situation of this Fig. 9 (B), roughly send luminosity Bo from regional 3 5a
1Light.From regional 35b by brightness k Bo
1Light leak L
1Luminous, from regional 35c by brightness k
2Bo
1Light leak L
2Luminous, from regional 35d by brightness k
3Bo
1Light leak L
3Luminous.
The brightness of the light that sends from regional 35a～35d when the light source 352 of regional 35a～35d is lighted separately respectively as shown in figure 10.The brightness of the light that sends from each regional 35a～35d when the light source 352 that regional 35a～35d is all is lighted is for all brightness of the total of additions on longitudinal direction of the brightness shown in the table of Figure 10.That is, the brightness of the light that sends from regional 35a is Bo
1+ kBo
2+ k
2Bo
3+ k
3Bo
4, the brightness of the light that sends from regional 35b is k Bo
1+ Bo
2+ k Bo
3+ k
2Bo
4The brightness of the light that sends from regional 35c is k
2Bo
1+ k Bo
2+ Bo
3+ k Bo
4, the brightness of the light that sends from regional 35d is k
3Bo
1+ k
2Bo
2+ k Bo
3+ Bo
4The luminosity of the light that should send from regional 35a～35d is B
1'～B
4', therefore as can be known can be with Bo in regional 35a
1+ k Bo
2+ k
2Bo
3+ k
3Bo
4Be made as B
1', in regional 35b with k Bo
1+ Bo
2+ k Bo
3+ k
2Bo
4Be made as B
2', in regional 35c with k
2Bo
1+ k Bo
2+ Bo
3+ k Bo
4Be made as B
3', in regional 35d with k
3Bo
1+ k
2Bo
2+ k Bo
3+ Bo
4Be made as B
4'.
Formula (1) shown in Figure 11 (A) will be used for from the luminosity Bo of the light that is sent by light source 352
1, Bo
2, Bo
3, Bo
4Obtain luminosity B
1', B
2', B
3', B
4' change type show with the matrix operation formula.Formula (2) shown in Figure 11 (B) will be used for from luminosity B
1', B
2', B
3', B
4' obtain luminosity Bo
1, Bo
2, Bo
3, Bo
4Change type show with the matrix operation formula.Formula (3) shown in Figure 11 (C) in order to calculate easily on the circuit in luminosity operational part 22, is put in order formula (2).Constant a, b, the c of formula (4) representation formula (3) shown in Figure 11 (D).From the formula (3) of Figure 11 (C) as can be known, luminosity Bo
1, Bo
2, Bo
3, Bo
4, the coefficient (conversion coefficient) that can escape to self zone other regional light quantities in addition by the light that sends based on the light source 352 from regional 35a～35d multiply by luminosity B
1', B
2', B
3', B
4' try to achieve.
Owing to can measure a zone from back lighting device 35 to the light leak L of adjacent areas
1, therefore can try to achieve in advance in the value of Fig. 9, attenuation coefficient k illustrated in fig. 10.Therefore, can be according to the formula (3) of Figure 11 (C) and the formula (4) of Figure 11 (D), correctly calculate the luminosity Bo of the light that regional 35a～35d light source 352 separately should send
1, Bo
2, Bo
3, Bo
4
In addition, to attenuation coefficient k hour of the light leak of adjacent areas, the above item of 2 powers of k is reduced to negligible degree.At this moment, can suppose that also the light that sends from a zone only escapes to adjacent areas, carries out approximate treatment.That is, also 2 items more than the power of k can be made as 0 calculates.In addition, according to the structure of back lighting device 35, also exist the light that sends from a zone with k
2Doubly ..., k
n(at this n=3) different decay mode situation about spilling doubly, but can measure in advance to each regional light leak therefore in this case, also can correctly calculate the luminosity Bo of the light that light source 352 should send
1, Bo
2, Bo
3, Bo
4This point is also identical under the situation of the different Fig. 5 of the method for Region Segmentation or Fig. 7.
In addition, back lighting device 35 is being divided in vertical direction 8 when regional, if the luminosity of the light that should send from 8 zones is B
1'～B
8', the luminosity directly over the independent light source 352 when luminous of the light source on 8 zones 352 is made as Bo
1～Bo
8, luminosity Bo then
1～Bo
8Can calculate according to formula shown in Figure 12 (5).And then, be divided into n zone (n is the integer more than 2), then luminosity B in vertical direction if be generalized to
1'～B
n' obtain luminosity Bo with the formula (6) shown in Figure 13 (A)
1～Bo
n, can calculate according to the formula (7) shown in Figure 13 (B).
Next, the computing method of the brightness of the light that light source 352 should send during for back lighting device 35B shown in Figure 5 to back lighting device 35 describe.As shown in figure 14, the light source 352 of establishing regional 35a1～35a4,35b1～35b4 from back lighting device 35B, 35c1～35c4,35d1～35d4 escape to the light leak of adjacent areas on the horizontal direction be the light that sends from light source 352 m doubly.The attenuation coefficient m of horizontal direction is the value greater than 0, less than 1.Escape to the light leak of adjacent areas on the vertical direction, with the situation of back lighting device 35A similarly, be the light that sends from light source 352 k doubly.To be made as B from the luminosity of regional 35a1～35a4, the 35b1～35b4 of back lighting device 35B, light that in fact 35c1～35c4,35d1～35d4 should send
11'～B
14', B
21'～B
24', B
31'～B
34', B
41'～B
44'.In order to obtain this luminosity B
11'～B
14', B
21'～B
24', B
31'～B
34', B
41'～B
44', the luminosity of the light that the light source 352 that each is regional should send is made as Bo
11～Bo
14, Bo
21～Bo
24, Bo
31～Bo
34, Bo
41～Bo
44
If will be at Fig. 9, illustrated in fig. 10ly considered that the computing method of the luminosity of light leak also are applicable to horizontal direction, then matrix operation formula as shown in figure 15.Formula (8) shown in Figure 15 (A) is the luminosity Bo that is used for from the light that is sent by light source 352
11～Bo
44Obtain luminosity B
11'～B
44' the change type of matrix operation formula.Formula (9) shown in Figure 15 (B) is to be used for from luminosity B
11'～B
44' obtain luminosity Bo
11～Bo
44The change type of matrix operation formula.If formula (9) is put in order, then become the formula (10) shown in Figure 15 (C).Constant a, b, c, d, e, the f of formula (11) representation formula (10) shown in Figure 15 (D).Under the situation of Figure 14, the value of attenuation coefficient k, m also can be tried to achieve in advance, therefore can be according to the formula (10) of Figure 15 (C) and the formula (11) of Figure 15 (D), correctly calculate the luminosity Bo of the light that regional 35a1～35d4 light source 352 separately should send
11～Bo
44
In that being reached in the horizontal direction, back lighting device 35 is divided into 8 on the vertical direction both sides when regional, if the luminosity of the light that should send from 64 zones is B
11'～B
88', the luminosity directly over the independent light source 352 when luminous of the light source on 64 zones 352 is made as Bo
11～Bo
88, luminosity B then
11'～B
88' obtain luminosity Bo with the formula (12) shown in Figure 16 (A)
11～Bo
88Can calculate according to the formula (13) shown in Figure 16 (B).And then, be divided into n zone (n is the integer more than 2), then luminosity Bo on the vertical direction both sides if be generalized to reach in the horizontal direction
11～Bo
N, nCan utilize luminosity B
11'～B
N, n' calculate according to formula shown in Figure 17 (14).Though omitted diagram, but be divided into nh zone (nh is the integer 2 or more) in the horizontal direction, being divided into nv in vertical direction, regional (nv is the integer more than 2, and be the value different with nh) situation under, equally also can be by using the matrix operation formula, correctly calculate the luminosity of the light that each light source 352 should send.
Return Fig. 1, supply with attenuation coefficient k, the m that uses the luminosity operational part 22 from control part 50.Attenuation coefficient k, m can change arbitrarily.The data of the luminosity of the light that each light source 352 in a plurality of zones of the back lighting device 35 that expression as above obtains should send supply to white balance adjustment part 23.To the colour temperature data of white balance adjustment part 23 input from the colour temperature of the temperature data of the temperature of the expression back lighting device 35 of temperature sensor 37 outputs and the light that sends from the expression of color sensor 38 outputs from back lighting device 35.
As mentioned above, if the temperature variation of back lighting device 35, then the brightness of the light that sends from LED (the particularly LED of R) changes.Therefore, white balance adjustment part 23 according to temperature data and colour temperature data, is adjusted the light quantity of the LED of R, G, B when light source 352 is three-color LED, is adjusted into best white balance.In addition, the white balance of back lighting device 35 also can be adjusted according to the external control signal Sct1 that supplies with from control part 50.In addition, the variation of the white balance backlight that the variation that produces in the temperature variation of light source 352 or long-time back causes hour also can be removed white balance adjustment part 23.
The data of the luminosity of the light that each light source 352 from a plurality of zones of the expression back lighting device 35 of white balance adjustment part 23 output should send supply to PWM timing sequence generating portion 24.When light source 352 was LED, versicolor LED's was luminous for example according to the modulated pulse width modulating signal Be Controlled of pulse width.The PWM time series data that PWM timing sequence generating portion 24 will comprise the sequential that produces pulse width modulating signal and be used to adjust the pulse width of luminous quantity (fluorescent lifetime) supplies to backlight drive portion 36.Backlight drive portion 36 produces the drive signal as pulse width modulating signal according to the PWM time series data of input, and the light source 352 (LED) of back lighting device 35 is driven.
At this, represented example, but also can control the luminosity of LED by the current value that LED is flow through in adjustment by the pulse width modulating signal driving LED.At this moment, the timing sequence generating portion of the time series data that produces the sequential be used to determine LED upper reaches excess current and current value can be set, to replace PWM timing sequence generating portion 24.In addition, when light source 352 is light source beyond the LED, the control of the luminous quantity corresponding can be carried out, the timing sequence generating portion that produces the time series data corresponding can be used with the kind of light source with the kind of light source.
In Fig. 1, backlight illumination control part 20 is independent with control part 50, but circuit in the backlight illumination control part 20 all or part of also can be set in control part 50.In addition, for example maximum gray scale detection portion 11 in the structure of Fig. 1, image gain operational part 12, and the part of backlight illumination control part 20 can constitute by hardware, also can constitute by software, also can be the structure that both are mixed.Need not to illustrate separately, synchronized with each other from the control of the demonstration on liquid crystal panel 34 of each frame of the signal of video signal of signal of video signal handling part 10 output, the backlight illumination corresponding with backlight illumination control part 20 and the high-high brightness of signal of video signal each frame.In Fig. 1, omitted the diagram that is used to make both synchronous structures.
Utilize Figure 18, to the action of the liquid crystal indicator shown in Figure 1 of above explanation, and liquid crystal indicator shown in Figure 1 in the step of the image display method that carries out illustrate separately.In Figure 18, maximum gray scale of signal of video signal detects in maximum gray scale detection portion 11 to each zone in a plurality of zones of liquid crystal panel 34 in step S11.Image gains operational part 12 in step S12, the gain that the signal of video signal that each zone of computing and liquid crystal panel 34 upward shows multiplies each other.Liquid Crystal Module 30 is presented at each the regional signal of video signal that multiply by gain on the liquid crystal panel 34 in step S13.With this step S12, S13 execution in step S14～S17 side by side.
In structure shown in Figure 1, try to achieve the luminosity B ' that has implemented non-homogeneousization processing by non-homogeneousization handling part 21, luminosity operational part 22 is tried to achieve luminosity Bo according to this luminosity B ', but also can implement non-homogeneousization processing after trying to achieve luminosity Bo by luminosity operational part 22.That is, also can be with non-homogeneousization handling part 21 and 22 exchanges of luminosity operational part.Utilize Figure 19 that action and the step of this moment are described.
In Figure 19, step S21～S23 is identical with step S11～S13 of Figure 18.Luminosity control part 22 is in step S24, try to achieve the luminosity B of the light that should send from a plurality of zones of back lighting device 35, in step S26, according to the arithmetic expression of having used luminosity B and conversion coefficient, try to achieve the luminosity Bo of the light that the light source 352 in a plurality of zones of back lighting device 35 self should send.Non-homogeneousization handling part 21 multiply by coefficient p as luminosity Bo ' with luminosity Bo in step S25.And, PWM timing sequence generating portion 24 and backlight drive portion 36 in step S27, with the synchronous state of step S23 under, make the light source 352 in a plurality of zones of back lighting device 35 luminous with luminosity Bo '.
Yet, the non-homogeneousization processing of non-homogeneousization handling part 21, want the consumption electric power of back lighting device 35 than above-mentioned non-patent literature 1 or above-mentioned patent documentation 1～3 in the structure of record be essential when further cutting down, but, also non-homogeneousization handling part 21 can be omitted consuming electric power can be identical the time with the structure put down in writing in these documents.Utilize Figure 20 that action and the step of this moment are described.In Figure 20, step S31～S33 is identical with step S11～S13 of Figure 18.Luminosity operational part 22 is in step S34, try to achieve the luminosity B of the light that should send from a plurality of zones of back lighting device 35, at step S36, according to the arithmetic expression of having used luminosity B and conversion coefficient, try to achieve the luminosity Bo of the light that the light source 352 in a plurality of zones of back lighting device 35 self should send.And, PWM timing sequence generating portion 24 and backlight drive portion 36 in step S37, with the synchronous state of step S33 under, make the light source 352 in a plurality of zones of back lighting device 35 luminous with luminosity Bo.
As mentioned above, in the liquid crystal indicator that first embodiment relates to, back lighting device 35 has the permission light that separately light source 352 sends from a plurality of zones and escapes to other regional structures beyond the self zone, therefore need not the zone of liquid crystal panel 34 and back lighting device 35 corresponding accurately.In addition, can correctly calculate the luminosity B that should send respectively according to the luminosity Bo that makes the independent light source 352 when luminous of each regional light source 352 self from a plurality of zones of back lighting device 35.Therefore, the brightness backlight of shining on a plurality of zones on the liquid crystal panel 34 can accurately be controlled according to the lightness of the signal of video signal that shows on this zone.
And then, each zone of back lighting device 35 is not complete independence, utilization has considered that the arithmetic expression that escapes to other the regional structures beyond the self zone from the light that light source 352 sends tries to achieve luminosity Bo, therefore lightness or tone are not easy to produce deviation in a plurality of zones on liquid crystal panel 34, can improve the quality of the image that shows on the liquid crystal panel 34.
Second embodiment
Figure 21 is the integrally-built block diagram of the liquid crystal indicator that relates to of expression second embodiment of the present invention.In Figure 21, the part identical with Fig. 1 is marked with same label, and suitably omits its explanation.In addition, in Figure 21,, omitted the non-homogeneousization handling part 21 among Fig. 1, but also can be the structure that has non-homogeneousization handling part 21 with first embodiment equally in order to simplify.
As mentioned above, in the first embodiment, try to achieve the luminosity Bo of the light that the light source 352 in a plurality of zones of back lighting device 35 self should send according to luminosity operational part 22, thereby make the light source 352 in a plurality of zones luminous.This luminosity Bo is the brightness value on each regional central point.Figure 22 (A) expression only has back lighting device 35 is divided into regional 35b among the back lighting device 35A in 4 zones Luminance Distribution when luminous in vertical direction shown in Fig. 4 (A).At regional 35b with the luminosity Bo shown in Figure 22 (A)
2When luminous, luminosity is k Bo in regional 35a, 35c
2, luminosity is k in regional 35d
2Bo
2, become illustrated Luminance Distribution.The luminous quantity of the light that sends from the light source 352 of regional 35b of this moment can be expressed as in Figure 22 (B) and coat hatched zone.That is, the luminous quantity of the light shown in Figure 22 (B) can be expressed as the integrated value of the light (light beam) of the scope of being represented by the Luminance Distribution of Figure 22 (A).
Compare with the luminosity B that tries to achieve the light that should send according to luminosity Bo, preferably according to trying to achieve as luminous quantity from the light of the luminous integrated value of light source 352 from a plurality of zones from the light of each regional light source 352 self.Therefore, in second embodiment shown in Figure 21, between luminosity operational part 22 and white balance adjustment part 23, be provided with luminosity Bo is converted to luminous quantity operational part 25 as the luminous quantity Boig of integrated value.Luminous quantity Boig can try to achieve simply according to the arithmetic expression that is converted to luminous quantity Boig from luminosity Bo.
Figure 23 (A) is that the situation with back lighting device 35A is the arithmetic expression of an example.Figure 23 (B) is the constant s in the formula (15) shown in Figure 23 (A)
1～s
4, constant s
1～s
4Can utilize attenuation coefficient k to be expressed as formula (16).In addition, Figure 23 (A), (B) represent to be converted to from luminosity Bo the arithmetic expression of luminous quantity Boig with approximate expression.When for example the regional 35a in back lighting device 35A was luminous, the integrated value of the light of irradiation on the liquid crystal panel 34 can be approx by formula shown in Figure 24 (17) expression, k
3Very little, therefore, then can represent by formula (18) if it is ignored.In addition, when the regional 35b in back lighting device 35A was luminous, the integrated value of the light of irradiation on the liquid crystal panel 34 can if formula (19) is rewritten, then become formula (20) approx by formula (19) expression.When back lighting device 35 being divided in vertical direction a plurality of zone, the coefficient s that multiplies each other with the luminosity Bo in the zone that is positioned at upper and lower end parts is 1+k, and the coefficient s that multiplies each other with each regional luminosity Bo in the zone that is clipped in upper and lower end parts is (1+k)/(1-k).
Figure 25 (A) is the arithmetic expression of trying to achieve luminous quantity Boig during according to Fig. 5, back lighting device 35B shown in Figure 14 according to luminosity Bo.Constant s in the formula (21) shown in Figure 25 (A)
1～s
4Be the formula (16) shown in Figure 23 (B), constant t
1～t
4Can utilize attenuation coefficient m to be expressed as Figure 25 (B) formula (22).In that being reached in the horizontal direction, back lighting device 35 is divided on the vertical direction both sides a plurality of whens zone, the coefficient s that multiplies each other with the luminosity Bo in the zone that is positioned at upper and lower end parts is 1+k, the coefficient s that multiplies each other with each regional luminosity Bo in the zone that is clipped in upper and lower end parts is (1+k)/(1-k), the coefficient t that multiplies each other with the luminosity Bo in the zone that is positioned at left and right end portions is 1+m, and the coefficient t that multiplies each other with each regional luminosity Bo in the zone that is clipped in left and right end portions is (1+m)/(1-m).
In Figure 21, supply to PWM timing sequence generating portion 24 via white balance adjustment part 23 from the data of the expression luminous quantity Boig of luminous quantity operational part 25 output.PWM timing sequence generating portion 24, according to the data of expression luminous quantity Boig, the PWM time series data that generation is adjusted the pulse width of the pulse width modulating signal of backlight drive portion 36 generations.Like this, in second embodiment, the luminous quantity Boig that backlight drive portion 36 should send according to each the regional light source 352 in the back lighting device 35, therefore each regional light source 352 is driven, can correctly control than first embodiment the luminosity B of the light that should send from a plurality of zones.
In addition, utilizing the arithmetic expression that is converted to luminous quantity Boig from luminosity Bo of Figure 23～Figure 25 explanation is as mentioned above with the approximate arithmetic expression of trying to achieve of luminous quantity Boig, there be not the integrated value of perfect representation as the light of coating hatched zone shown in Figure 22 (B), even but approximate arithmetic expression also can obtain the luminous quantity Boig suitable with the integrated value of light.And then, also can utilize the complex calculations formula, try to achieve the integrated value of more correct light.
The 3rd embodiment
Figure 26 is the integrally-built block diagram of the liquid crystal indicator that relates to of expression the 3rd embodiment of the present invention.In Figure 26, the part identical with Fig. 1 is marked with same label, and suitably omits its explanation.In addition, in Figure 26,, omitted the non-homogeneousization handling part 21 among Fig. 1, but also can be the structure that has non-homogeneousization handling part 21 with first embodiment equally in order to simplify.In addition, in Figure 26, have the luminous quantity operational part 25 identical, but also can be the structure of removing luminous quantity operational part 25 with second embodiment.
Figure 27 (A) is the situation that liquid crystal panel 34 and regional 35a～35d of back lighting device 35A are divided into regional 34a～34d accordingly, and the gray scale of representing regional 34a, 34b, 34d is that 0 (being black) and regional 34c are the situation of maximum gray scale 255 (i.e. white).The luminosity B of the light that should send from regional 35a～35d of back lighting device 35A of this moment is depicted as B as Figure 27 (B)
1, B
2, B
3, B
4At this moment, the luminosity Bo of the light that the light source 352 of regional 35a～35d of back lighting device 35A self should send is depicted as Bo as Figure 27 (C) on calculating
1, Bo
2, Bo
3, Bo
4, become negative value at regional 35a, 35b, 35d.The 3rd embodiment has been taked measure when trying to achieve luminosity Bo, do not make light source 352 with the negative luminous impossible state of brightness value so that do not produce.
Therefore, in the 3rd embodiment, at luminosity B
1～B
nDuring condition shown in the coincidence formula (23), with luminosity B
1～B
nCorrection is to try to achieve luminosity Bo after satisfying the value of the formula (24) of Figure 28 (B).Do not make luminosity Bo become negative value, the formula (25) that satisfies Figure 28 (C) at least gets final product.Shown in formula (24), allow to make the gray-scale value of luminosity B greater than formula (25), be not only because in order to make luminosity Bo not become negative value and luminosity B to be proofreaied and correct, also luminosity B increased because also can visually not produce.
Figure 29 is illustrated in and back lighting device 35 is reached the luminosity Bo that is divided into a plurality of whens zone on the vertical direction both sides in the horizontal direction becomes the condition of negative value and the corrected value of luminosity B.Be marked on i zone arbitrarily that subscript i on the luminosity B represents vertical direction, j represent horizontal direction arbitrarily j regional.Luminosity Bo becomes the condition of the luminosity B of negative value in a plurality of zones that formula (26) expression of Figure 29 (A) is arranged in vertical direction on calculating.When the condition shown in the luminosity B coincidence formula (26), try to achieve luminosity Bo after luminosity B proofreaied and correct value for the formula (27) that satisfies Figure 29 (B), (C) or formula (28).
And then luminosity Bo becomes the condition of the luminosity B of negative value in a plurality of zones that formula (29) expression of Figure 29 (D) is arranged in the horizontal direction on calculating.Shown in formula (29), under the situation in the horizontal direction, luminosity Bo becomes negative value on calculating condition is determined by attenuation coefficient m.When the condition shown in the luminosity B coincidence formula (29), try to achieve luminosity Bo after luminosity B proofreaied and correct value for the formula (30) that satisfies Figure 29 (E), (F) or formula (31).
Figure 27 (D) expression is the luminosity B that does not produce the luminosity Bo of the negative value shown in Figure 27 (C) with gray level correction.If use the luminosity B shown in this Figure 27 (D) to try to achieve luminosity Bo, then shown in Figure 27 (E), luminosity Bo can not be a negative value.In addition, according to the formula (25) of Figure 28 (C) luminosity B is proofreaied and correct so that negative luminosity Bo correction is the situation of gray-scale value 0 in this expression.
Return Figure 26, the structure and the action of the 3rd embodiment described.In first embodiment shown in Figure 1, image gain operational part 12 utilizes from the data of the maximum gray scale in each zone of the expression liquid crystal panel 34 of maximum gray scale detection portion 11 inputs and tries to achieve gain, but the 3rd embodiment shown in Figure 26 is following structure.In Figure 26, as the explanation in Figure 28, Figure 29, luminosity operational part 22 is to calculate when becoming the luminosity B of negative value at luminosity Bo, and B proofreaies and correct to luminosity, so that luminosity Bo is at gray-scale value more than 0.And luminosity operational part 22 is tried to achieve luminosity Bo according to the luminosity B that is corrected, and supplies to luminance operational part 25.The luminosity B that this is corrected is fed into image gain operational part 12.Image gain operational part 12 is according to the luminosity B that is corrected, the gain that computing and signal of video signal multiply each other.
No matter when image gain operational part 12 utilizes the data of the maximum gray scale of each regional signal of video signal of expression to try to achieve gain, when still the luminosity B that is corrected in utilization tries to achieve gain, image gain operational part 12 will with use the suitable value of value that obtains divided by the maximum gray scale of each regional signal of video signal by the obtained maximum gray scale of the signal of video signal of the figure place decision of signal of video signal, as the gain of each regional signal of video signal is tried to achieve.
In the 3rd embodiment, do not need to supply with to image gain operational part 12 data of the maximum gray scale in each zone of expression from maximum gray scale detection portion 11.Represent gain operational part 12 as the arrow of with dashed lines in Figure 26 from maximum gray scale detection portion 11 to image, also can with first embodiment similarly, supply with the data of the maximum gray scale in each zone of expression to image gain operational part 12 from maximum gray scale detection portion 11.In the time of also can only on luminosity Bo is calculating, becoming negative value, utilize the luminosity B that is corrected to replace the data of the maximum gray scale of expression to try to achieve gain.
The 4th embodiment
The one-piece construction of the liquid crystal indicator that the 4th embodiment of the present invention relates to is any one of above-mentioned first～the 3rd embodiment.The structure of the 4th embodiment is, the Luminance Distribution the characteristic how light that sends from the light source 352 of back lighting device 35 is set more preferably analyzed, and adopted the light source 352 with this preferred Luminance Distribution characteristic.
The Luminance Distribution characteristic of the light that a light source 352 in the zone of Figure 30 (A) expression from back lighting device 35 sends.For easy understanding, light source 352 is made as pointolite.Luminance Distribution characteristic shown in this Figure 30 (A), for example with each zone of back lighting device 35A, the 35B of Fig. 4, Fig. 5 is blocked in vertical direction and characteristic when observing is suitable.In Figure 30 (A), the longitudinal axis is a brightness value, and transverse axis is the distance apart from light source 352.Being standardized as 1 in this maximal value with brightness value (center brightness) also illustrates.W is the width of the vertical direction in a zone.The curve that this Luminance Distribution characteristic is represented is made as Luminance Distribution function f (x).
The inventor is carrying out various result of experiment discoveries, for example in a zone that makes back lighting device 35 when luminous, according to the state of Luminance Distribution function f (x), the border ladder is recognized on border that should the zone on liquid crystal panel 34, damages the image quality of the image that shows on the liquid crystal panel 34.The differentiation function f ' that Figure 30 (B) expression has been carried out differential to Luminance Distribution function f (x) (x).Result of experiment is judged, and differentiation function f ' maximal value (the differential maximal value of brightness differentiation function f (x)) (x) exerts an influence to the identification degree of border ladder.
As shown in table 1 below, a plurality of light sources 352 that the inventor will have as the fc1～fc8 of the different Luminance Distribution function f (x) of Luminance Distribution characteristic optionally are used for back lighting device 352, and the identification degree that the non-boundary ladder is arranged is investigated.
Table 1
| fc1 | fc2 | fc3 | fc4 | fc5 | fc6 | fc7 | fc8 | |
| The differential maximal value | 1.2 | 1.4 | 1.6 | 1.8 | 2.0 | 2.2 | 2.5 | 3.0 |
| The border ladder | Do not have | Do not have | Do not have | Do not have | Do not have | Have | Have | Have |
Fc1, fc3, fc5, fc7, fc8 in Luminance Distribution function f c1～fc8 in Figure 31 (A) expression table 1, Figure 31 (B) expression Luminance Distribution function f c1, fc3, fc5, differentiation function f ' c1, the f ' c3 of fc7, fc8, f ' c5, f ' c7, f ' c8.As shown in table 1, for the border that makes the zone is not recognizable as the border ladder, need to use light source 352: expression differentiation function f ' absolute value (x) with following Luminance Distribution characteristic | f ' (x) | maximal value | f ' (x) max| in the Luminance Distribution function f (x) below 2.0.Certainly, needing maximal value | f ' (x) lower limit of max| surpasses 0.That is, need differentiation function f ' absolute value (x) | f ' (x) | maximal value | f ' (x) max| satisfy 0＜| f ' is max|≤2.0 (x).
Characteristic when this has represented the zone blocked in vertical direction and has observed, but owing to being the center along with decaying away from light source 352 and spread in concentric circles ground from the light of light source 352 with light source 352, therefore horizontal direction beyond vertical direction or any direction are all identical when observing from the Luminance Distribution characteristic of the light of light source 352.
Like this, in the liquid crystal indicator of the 4th embodiment, light source 352 as back lighting device 35, the maximal value of the absolute value of the differential value of the variable quantity of the slope of the Luminance Distribution function f (x) that the curve of use expression Luminance Distribution characteristic is represented is at the light source below 2.0, even therefore in a plurality of zones of back lighting device 35, only make part zone luminous, the border ladder can not recognized in the border in zone yet, can not damage the image quality of the image that shows on the liquid crystal panel 34.
And then, the desirable Luminance Distribution characteristic of the reduction effect of the consumption electric power of having considered back lighting device 35 is described.Figure 32 is the Luminance Distribution function f (x) identical with Figure 30 (A).Shown in figure 32, be standardized as at 1 o'clock, escape to adjacent areas from the light of this light source 352 with attenuation coefficient k, so the center brightness of adjacent areas be k in center brightness with light source 352.Figure 33 is expression attenuation coefficient k and consumes the figure of the relation of electric power relative value.In Figure 33, transverse axis is attenuation coefficient k, and the longitudinal axis is for consuming the electric power relative value, and irrespectively the consumption electric power when luminous is made as 100% with the luminosity of maximum with the gray scale that makes back lighting device 35 and signal of video signal.In addition, in Figure 33, Img1 and Img2 are the characteristic of the attenuation coefficient k in the still frame that differs from one another of expression pattern with the relation that consumes the electric power relative value.
As shown in figure 33, by carrying out brilliance control, consume electric power and cut down as the back lighting device 35 that illustrates in first embodiment.At this moment, as can be seen from Figure 33, be scope below 0.3 at attenuation coefficient k, even attenuation coefficient k increases, consume electric power and can not change significantly, but surpass 0.3 scope at attenuation coefficient k, be accompanied by the increase of attenuation coefficient k, consume electric power and increase greatly.Therefore, if consider the reduction effect of the consumption electric power of back lighting device 35, we can say that then preferred attenuation coefficient k is below 0.3.At this, the attenuation coefficient k of vertical direction is illustrated, but also is identical for the attenuation coefficient m of horizontal direction.That is, escape to and self zone in the horizontal direction or on the vertical direction during adjacent areas at the light that sends from a plurality of zones light source separately, the center brightness that preferably center brightness of self zone is made as 1 o'clock adjacent area surpasses 0, below 0.3.
The present invention is not limited to first of above explanation～the 4th embodiment, can carry out various changes in the scope that does not break away from main points of the present invention.The area in a plurality of zones of liquid crystal panel 34 and back lighting device 35 is identical in first～the 4th embodiment, but also can on purpose make area inequality.In addition, except liquid crystal indicator, when having occurred needing the image display device of back lighting device, the present invention can certainly use in this image display device.
Claims (20)
1. a liquid crystal indicator is characterized in that, comprising:
Liquid crystal panel, the show image signal;
Back lighting device, be configured in the rear side of above-mentioned liquid crystal panel, be divided into a plurality of zones, above-mentioned a plurality of zone has the light source of light that sends the above-mentioned liquid crystal panel of irradiation respectively, and has light that permission sends from above-mentioned a plurality of zones light source separately and escape to other regional structures beyond the self zone;
Maximum gray scale detection portion, according to each predetermined unit interval, on a plurality of zones of the above-mentioned liquid crystal panel corresponding with a plurality of zones of above-mentioned back lighting device respectively the first maximum gray scale of each regional signal of video signal of demonstration detect;
Image gain operational part, try to achieve and the suitable value of value that obtains divided by the above-mentioned first maximum gray scale with the second maximum gray scale, as the gain to the signal of video signal of each above-mentioned zone, the wherein said second maximum gray scale is obtained by the above-mentioned signal of video signal of the figure place decision of above-mentioned signal of video signal;
Multiplier multiply by the above-mentioned gain of being tried to achieve by above-mentioned image gain operational part with the signal of video signal of each above-mentioned zone, as the signal of video signal output that shows on the above-mentioned liquid crystal panel; And
The luminosity operational part, be made as high-high brightness with above-mentioned light source in the brightness of the light that will the above-mentioned a plurality of zones from above-mentioned back lighting device sends respectively and multiply by first luminosity that the inverse of the above-mentioned gain of being tried to achieve by above-mentioned image gain operational part obtains, and be to obtain this first luminosity and the brightness of the light that should send separately respectively when being made as second luminosity with the light source in the above-mentioned a plurality of zones in the above-mentioned back lighting device, utilize the arithmetic expression that multiply by first coefficient with above-mentioned first luminosity, try to achieve above-mentioned second luminosity, wherein above-mentioned first coefficient escapes to self zone other regional light quantities in addition based on the light that sends from above-mentioned a plurality of zones light source separately.
2. liquid crystal indicator according to claim 1 is characterized in that, comprising:
The luminous quantity operational part according to above-mentioned second luminosity, is tried to achieve the light on the above-mentioned liquid crystal panel was sent and shone in above-mentioned a plurality of zones in above-mentioned back lighting device respectively from the light source of self zone luminous quantity; With
Backlight drive portion drives above-mentioned back lighting device, so that the above-mentioned a plurality of zones light source separately in the above-mentioned back lighting device sends the light of the luminous quantity that is obtained by above-mentioned luminous quantity operational part.
3. liquid crystal indicator according to claim 1 and 2 is characterized in that,
Above-mentioned luminosity operational part, when utilizing above-mentioned arithmetic expression to try to achieve above-mentioned second luminosity, on above-mentioned second luminosity is calculating is under the situation of negative value, so that after the mode that above-mentioned second luminosity is the value more than 0 proofreaies and correct above-mentioned first luminosity, try to achieve above-mentioned second luminosity.
4. liquid crystal indicator according to claim 3 is characterized in that,
Above-mentioned image gain operational part according to above-mentioned first luminosity of having been proofreaied and correct by above-mentioned luminosity operational part, is tried to achieve above-mentioned gain.
5. liquid crystal indicator according to claim 1 and 2 is characterized in that,
Above-mentioned light source has following characteristic: the maximal value of absolute value that the curve of the Luminance Distribution characteristic of the light that expression is sent from each light source has carried out the differential value of differential surpasses 0 and below 2.0.
6. liquid crystal indicator according to claim 5 is characterized in that,
Above-mentioned back lighting device when the light that sends from above-mentioned a plurality of zones light source separately escapes to the self zone adjacent areas, was made as 1 o'clock in the center brightness with self zone, and the center brightness of adjacent areas is above 0 and below 0.3.
7. liquid crystal indicator according to claim 1 and 2 is characterized in that,
Above-mentioned arithmetic expression is the matrix operation formula.
8. liquid crystal indicator according to claim 1 and 2 is characterized in that,
A plurality of zones of above-mentioned liquid crystal panel are the zones with the one dimension division in vertical direction of above-mentioned liquid crystal panel.
9. liquid crystal indicator according to claim 1 and 2 is characterized in that,
A plurality of zones of above-mentioned liquid crystal panel are above-mentioned liquid crystal panel to be reached the vertical direction both sides in the horizontal direction go up the zone that two dimension is divided.
10. liquid crystal indicator according to claim 8 is characterized in that,
Comprise non-homogeneous handling part, a plurality of zones above-mentioned first luminosity separately with above-mentioned back lighting device multiply by second coefficient, above-mentioned first luminosity is become inhomogeneous, so that the zone of the central portion of the vertical direction that is positioned at a plurality of zones that one dimension arranges from above-mentioned liquid crystal panel begins till the zone that is positioned at upper and lower end parts, the luminance step scalariform ground on the above-mentioned liquid crystal panel reduces.
11. liquid crystal indicator according to claim 9 is characterized in that,
Comprise non-homogeneous handling part, a plurality of zones above-mentioned first luminosity separately with above-mentioned back lighting device multiply by second coefficient, above-mentioned first luminosity is become inhomogeneous, so that the zone of the central portion of the horizontal direction in a plurality of zones that are positioned at two-dimensional arrangements from above-mentioned liquid crystal panel begins till the zone that is positioned at left and right end portions, luminance step scalariform ground on the above-mentioned liquid crystal panel reduces, and begin till the zone that is positioned at upper and lower end parts from the zone of the central portion that is positioned at vertical direction, the luminance step scalariform ground on the above-mentioned liquid crystal panel reduces.
12. liquid crystal indicator according to claim 10 is characterized in that,
Above-mentioned second coefficient is the value more than 0.8, below 1.0.
13. liquid crystal indicator according to claim 11 is characterized in that,
Above-mentioned second coefficient is the value more than 0.8, below 1.0.
14. liquid crystal indicator according to claim 1 and 2 is characterized in that,
The above-mentioned light source of above-mentioned back lighting device is a light emitting diode.
15. an image display method is characterized in that,
The signal of video signal that shows on the liquid crystal panel is made as and each corresponding regional signal of video signal of a plurality of zones of setting on above-mentioned liquid crystal panel, and according to each predetermined unit interval, the first maximum gray scale to each regional signal of video signal of showing respectively on above-mentioned a plurality of zones detects
Try to achieve and the suitable value of value that obtains divided by the above-mentioned first maximum gray scale with the second maximum gray scale, as gain to the signal of video signal of each above-mentioned zone, the wherein said second maximum gray scale is obtained by the above-mentioned signal of video signal of the figure place decision of above-mentioned signal of video signal
Signal of video signal with each above-mentioned zone multiply by above-mentioned gain, and supplies to above-mentioned liquid crystal panel,
A plurality of zones of the back lighting device of above-mentioned liquid crystal panel and above-mentioned liquid crystal panel are divided into a plurality of zones accordingly, be made as high-high brightness with above-mentioned light source in the brightness of the light that will the above-mentioned a plurality of zones light source separately from above-mentioned back lighting device sends and multiply by first luminosity that the inverse of above-mentioned gain obtains, and be to obtain this first luminosity and the brightness of the light that should send separately respectively when being made as second luminosity with the light source in the above-mentioned a plurality of zones in the above-mentioned back lighting device, utilize the arithmetic expression that multiply by first coefficient with above-mentioned first luminosity, try to achieve above-mentioned second luminosity, wherein above-mentioned first coefficient escapes to self zone other regional light quantities in addition based on the light that sends from above-mentioned a plurality of zones light source separately
The a plurality of zones light source separately that makes above-mentioned back lighting device luminous the time, shows the signal of video signal of each above-mentioned zone that multiply by above-mentioned gain with above-mentioned second luminosity respectively on a plurality of zones of above-mentioned liquid crystal panel.
16. an image display method is characterized in that,
The signal of video signal that shows on the liquid crystal panel is made as and each corresponding regional signal of video signal of a plurality of zones of setting on above-mentioned liquid crystal panel, and according to each predetermined unit interval, the first maximum gray scale to each regional signal of video signal of showing respectively on above-mentioned a plurality of zones detects
Try to achieve and the suitable value of value that obtains divided by the above-mentioned first maximum gray scale with the second maximum gray scale, as gain to the signal of video signal of each above-mentioned zone, the wherein said second maximum gray scale is obtained by the above-mentioned signal of video signal of the figure place decision of above-mentioned signal of video signal
Signal of video signal with each above-mentioned zone multiply by above-mentioned gain, and supplies to above-mentioned liquid crystal panel,
A plurality of zones of the back lighting device of above-mentioned liquid crystal panel and above-mentioned liquid crystal panel are divided into a plurality of zones accordingly, be made as high-high brightness with above-mentioned light source in the brightness of the light that will the above-mentioned a plurality of zones light source separately from above-mentioned back lighting device sends and multiply by first luminosity that the inverse of above-mentioned gain obtains, and be to obtain this first luminosity and the brightness of the light that should send separately respectively when being made as second luminosity with the light source in the above-mentioned a plurality of zones in the above-mentioned back lighting device, utilize the arithmetic expression that multiply by first coefficient with above-mentioned first luminosity, try to achieve above-mentioned second luminosity, wherein above-mentioned first coefficient escapes to self zone other regional light quantities in addition based on the light that sends from above-mentioned a plurality of zones light source separately
According to above-mentioned second luminosity, try to achieve the luminous quantity that sends and shine the light on the above-mentioned liquid crystal panel in the above-mentioned a plurality of zones in above-mentioned back lighting device respectively from the light source of self zone,
Make above-mentioned a plurality of zones light source separately in the above-mentioned back lighting device luminous the time, on a plurality of zones of above-mentioned liquid crystal panel, show the signal of video signal of each above-mentioned zone that multiply by above-mentioned gain respectively with above-mentioned luminous quantity.
17. according to claim 15 or 16 described image display methods, it is characterized in that,
When utilizing above-mentioned arithmetic expression to try to achieve above-mentioned second luminosity, on calculating, above-mentioned second luminosity becomes under the situation of negative value, so that the mode that above-mentioned second luminosity is the value more than 0 is tried to achieve above-mentioned second luminosity after above-mentioned first luminosity is proofreaied and correct.
18. image display method according to claim 17 is characterized in that,
Try to achieve above-mentioned gain according to above-mentioned first luminosity of having proofreaied and correct.
19. according to claim 15 or 16 described image display methods, it is characterized in that,
As each light source in the above-mentioned back lighting device, the maximal value of absolute value that makes the curve of the Luminance Distribution characteristic with light that expression is sent from each light source carry out the differential value of differential surpasses 0 and at the light source of the characteristic below 2.0, luminous with above-mentioned second luminosity, and on a plurality of zones of above-mentioned liquid crystal panel, show the signal of video signal of each above-mentioned zone multiply by above-mentioned gain respectively.
20. image display method according to claim 19 is characterized in that,
Above-mentioned back lighting device when the light that sends from above-mentioned a plurality of zones light source separately escapes to the self zone adjacent areas, was made as 1 o'clock in the center brightness with self zone, and the center brightness of adjacent areas is above 0 and below 0.3.
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