CN100524446C - Image display device and image display method - Google Patents
Image display device and image display method Download PDFInfo
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- CN100524446C CN100524446C CNB2007101123901A CN200710112390A CN100524446C CN 100524446 C CN100524446 C CN 100524446C CN B2007101123901 A CNB2007101123901 A CN B2007101123901A CN 200710112390 A CN200710112390 A CN 200710112390A CN 100524446 C CN100524446 C CN 100524446C
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Abstract
An image display device comprises the following five units. A histogram generating unit generates histogram data based on an image signal. An amount-of-light control unit controls an amount-of-light adjustment unit so that the amount of light decreases as a ratio corresponding to a black color increase based on the histogram data. A holding unit holds first gradient correction data which is used to decide a character of an output gradient with respect to an input gradient of the image signal. An additional data generating unit generates additional data including one or more values which each increases as the ratio increases and adds the one or more values into the first gradient correction data in order to increase one or more gradients in a middle gradient region of the image signal.
Description
Technical field
The present invention relates to image display and image display method, particularly image display and the image display method that links and revise signal of video signal with fader control according to the light quantity of signal of video signal control light source.
Background technology
In recent years, as image display, be representative with the Braun tube display device (CRT) as main flow in the past, projection display equipment, liquid crystal indicator (LCD), plasma display system (PDP) etc. become main flow.Wherein, projection display equipment need be used for light is incided light source in the optical modulation element, and LCD need be as the light source of (backlight) backlight.
As an example, open in 2003-No. 36063 communiques (patent documentation 1) the Jap.P. spy, put down in writing image display with light source.
2003-No. 36063 communiques of [patent documentation 1] TOHKEMY
Projection display equipment and LCD are on the basis of the characteristic with light source, and the light from light source when darker image can drain on the show image, and the black of show image can dissociate, and the problem that is difficult to show black is arranged.
Summary of the invention
So, the purpose of this invention is to provide a kind of image display and image display method that the black table of show image can be shown original black, can show the image of contrast sense.
To achieve the above object, the invention provides the technical scheme of following (a)～(g).
(a) a kind of image display is characterized in that, possesses: display part (7,8) shows the signal of video signal of importing; Light source (71,86) produces the light that is used for showing at above-mentioned display part above-mentioned signal of video signal; Light quantity adjusting portion (72,82), the light quantity of regulating above-mentioned light source; Histogram generating unit (21) according to the luminance signal composition of above-mentioned signal of video signal, will be divided into a plurality of gray scales by every preset time unit from the minimum brightness to the high-high brightness, generate the histogram data of the distribution of each gray scale of expression; Maintaining part (31) keeps the 1st gray scale correction data, and the decision of the 1st gray scale correction data is with respect to the characteristic of the output gray level of the input gray level of above-mentioned signal of video signal; Fader control portion (3,79,82) according to above-mentioned histogram data, controls above-mentioned light quantity adjusting portion, so that along with the ratio of the gray scale of every above-mentioned preset time unit representation black becomes the light quantity that reduces above-mentioned light source greatly; Additional data generating unit (31), generation is used for for the gray scale in the predetermined middle gray zone of improving above-mentioned signal of video signal by each gray scale in above-mentioned middle gray zone data to the additional usefulness of above-mentioned the 1st gray scale correction data, promptly becomes with the ratio of the gray scale of seeing every above-mentioned preset time unit representation black according to above-mentioned straight ten thousand diagram datas and becomes big additional data greatly; And gray scale correction portion (42) according to above-mentioned the 1st gray scale correction data or the 2nd gray scale correction data that above-mentioned the 1st gray scale correction data have been added above-mentioned additional data, is revised the gray scale of above-mentioned signal of video signal; Also possess: enhancement process portion (41,410), carry out the emphasizing contour of above-mentioned signal of video signal; Control part (3) is controlled above-mentioned enhancement process portion, so that increase along with the ratio of the gray scale of every above-mentioned schedule time unit representation black becomes the emphasizing contour that makes greatly above-mentioned signal of video signal according to above-mentioned histogram data.
(b) a kind of image display is characterized in that, possesses: display part shows the signal of video signal of importing; Light source produces the light that is used for showing at above-mentioned display part above-mentioned signal of video signal; The light quantity adjusting portion, the light quantity of regulating above-mentioned light source; Enhancement process portion carries out the emphasizing contour of above-mentioned signal of video signal; The histogram generating unit, the luminance signal composition according to the signal of video signal after emphasizing through above-mentioned enhancement process contouring will be divided into a plurality of gray scales by every preset time unit from the minimum brightness to the high-high brightness, generate the histogram data of the distribution of each gray scale of expression; Maintaining part keeps the 1st gray scale correction data, and the decision of the 1st gray scale correction data is with respect to the characteristic of the output gray level of the input gray level of above-mentioned signal of video signal; Fader control portion according to above-mentioned histogram data, controls above-mentioned light quantity adjusting portion, so that along with the ratio of the gray scale of every above-mentioned preset time unit representation black becomes the light quantity that reduces above-mentioned light source greatly; The additional data generating unit, generation is used for for the gray scale in the predetermined middle gray zone of improving above-mentioned signal of video signal by each gray scale in above-mentioned middle gray zone data to the additional usefulness of above-mentioned the 1st gray scale correction data, promptly becomes big additional data according to above-mentioned histogram data greatly along with the ratio of the gray scale of every above-mentioned preset time unit representation black becomes; And the gray scale correction portion according to above-mentioned the 1st gray scale correction data or the 2nd gray scale correction data that above-mentioned the 1st gray scale correction data have been added above-mentioned additional data, is revised the gray scale of above-mentioned signal of video signal; Control part is controlled above-mentioned enhancement process portion, so that increase along with the ratio of the gray scale of every above-mentioned schedule time unit representation black becomes the emphasizing contour that makes greatly above-mentioned signal of video signal according to above-mentioned histogram data.
As (a) or (b) described image display, it is characterized in that (c) signal of video signal of above-mentioned enhancement process portion after with emphasizing contour supplies in the above-mentioned gray scale correction portion.
(d) as each described image display in (a)～(c), it is characterized in that, above-mentioned additional data generating unit generates above-mentioned additional data, so that in the gray areas that comprises above-mentioned middle gray zone, the residual quantity of the above-mentioned additional data between adjacent gray scale is below the predefined value.
(e) as each described image display in (a)～(d), it is characterized in that having: optical modulation element (74), according to the light of above-mentioned signal of video signal modulation incident; And white-balance correction portion (78), revise the white balance of above-mentioned signal of video signal, supply in the above-mentioned optical modulation element; Above-mentioned light source produces the above-mentioned light that incides in the above-mentioned optical modulation element; Above-mentioned light quantity adjusting portion is to regulate the aperture (72) of the amount of above-mentioned light; Also has the white balance control part (3) of correction of controlling the white spirit weighing apparatus of above-mentioned white-balance correction portion according to the amount of the light by said aperture.
As each described image display in (a)～(d), it is characterized in that (f) above-mentioned display part has display panels (85); Above-mentioned light source is the backlight (86) that produces the light that incides above-mentioned display panels.
(g) a kind of image display method, it is characterized in that, luminance signal composition according to the signal of video signal that is shown in display part will be divided into a plurality of gray scales by every preset time unit from the minimum brightness to the high-high brightness, generate the histogram data of the distribution of each gray scale of expression; According to above-mentioned histogram data, obtain the ratio of the gray scale of every above-mentioned preset time unit representation black; Along with the ratio change of the gray scale of representing above-mentioned black is big, reduce to be used for showing the light quantity that the light source of the light of above-mentioned signal of video signal sends at above-mentioned display part from generation; Control, so that improve the gray scale in the predetermined middle gray zone the above-mentioned signal of video signal along with reducing the light quantity of sending from above-mentioned light source; Also control, so that increase the degree of the emphasizing contour that above-mentioned signal of video signal is implemented along with reducing the light quantity of sending from above-mentioned light source.
The effect of invention:, can enrich the performance of the black of show image, the image that reproduction has the contrast sense according to the present invention.
Description of drawings
Fig. 1 is the block diagram of the 1st embodiment of expression image display involved in the present invention.
Fig. 2 is the block diagram of the display part 7 of expression first embodiment.
Fig. 3 (A) is the figure of the switching of expression aperture 72 (B).
Fig. 4 is the figure of an example of the distribution of expression luminance signal.
Fig. 5 is the figure of the fader control of expression first embodiment.
Fig. 6 is the figure of an example of expression enhancement process.
Fig. 7 (A) is the figure of an example of expression dynamic gamma processing (B).
Fig. 8 (A) is the figure of an example of expression residual quantity restriction processing (B).
Fig. 9 is the figure of the correction example of expression gamma curve.
Figure 10 is the table of transmissivity of each light quantity of the expression aperture opening ratio of aperture 72 and R, G, B.
Figure 11 is the figure of correction example of the motivation value of expression R signal.
Figure 12 is the figure of correction example of the motivation value of expression G signal.
Figure 13 (A) is the figure of expression IIR structure of filter and characteristic (B).
Figure 14 is the block diagram of second embodiment of expression image display involved in the present invention.
Figure 15 is the block diagram of the 3rd embodiment of expression image display involved in the present invention.
Figure 16 is the figure of the fader control of expression the 3rd embodiment.
Embodiment
＜the first embodiment 〉
Below, with reference to accompanying drawing embodiments of the present invention are described.Fig. 1 is the block diagram of expression as the image display 10 of the 1st embodiment of the present invention.Image display 10 is projection display equipments.Image display 10 possesses image feature test section 2, control part (CPU) 3, signal of video signal handling part 4, initial value configuration part 5, D/A transformation component 6 and display part 7.
Be input to input signal of video signal in the image display 10 (brightness signal Y, colour difference signal B-Y and R-Y) be fed in image feature test section 2 and the signal of video signal handling part 4.The input signal of video signal both can be the interleaved signal of field unit, also can be the progressive-scan signal of frame unit.In the present embodiment, with frame unit's input progressive-scan signal.
For example per 1 picture (1 frame) of the input signal of video signal that 2 pairs of image feature test sections are supplied to generates the data (detection signal) of the feature of expression image, to control part 3 outputs.In addition, do not need to generate detection signal, can generate detection signal yet according to the pixel of the predetermined zone that is included in the middle section that for example comprises picture (detection block) according to the whole pixel of 1 frame.
In the present embodiment, image feature test section 2 possesses histogram detector 21, will represent that histogrammic data export as detection signal.Histogram detector 21 will be imported the gray scale (Bands Tone of the luminance signal composition Y (input luminance signal Y) of signal of video signal) by every preset time unit (per 1 frame) minimum brightness is divided into a plurality of gray scales to high-high brightness, counting is present in the quantity of the pixel in each gray scale, generates the histogram data of the distribution of each gray scale of expression.
Signal of video signal handling part 4 possesses enhancement process portion 41, gray scale correction portion 42 and matrixing portion 43.4 pairs of input signal of video signal of being supplied with of signal of video signal handling part are implemented correction described later according to the control data that control part 3 generates, and modified image signal is supplied with to display part 7.The correction of in signal of video signal handling part 4 the input signal of video signal being implemented is the correction with the fader control interlock of display part 7 described later.
Initial value configuration part 5 maintains the initial set value of the light quantity that is used for setting the light source that display part 7 possessed.Initial set value is the value that is used for setting the light quantity of light source, for example is current value.In advance when the dispatching from the factory of image display 10 or the settings such as menu operation by the user.
D/A transformation component 6 will be a simulating signal by the fader control data conversion of control part 3 outputs, to display part 7 outputs.Display part 7 makes based on the fader control of fader control data and the demonstration interlock of the signal of video signal of exporting from signal of video signal handling part 4.
The block diagram of expression display part 7 among Fig. 2.Display part 7 possesses light source (lamp) 71, look decomposition portion 73, optical modulation element 74R, 74G, 74B, look synthetic portion 75, projection lens 76, screen 77, element drives portion 78, mechanical aperture 72 and aperture drive division 79.
The light that has synthesized LRm, LGm, LBm in the synthetic portion 75 of look is projected on the screen 77 by projection lens 76 via aperture 72.Aperture 72 is to regulate the parts incide the light in the projection lens 76, is not limited to position shown in Figure 2, if till inciding projection lens 76 to light from light source 71 generations between the position just passable.
Look decomposition portion 73 is made of dichronic mirror and catoptron etc., and look synthetic portion 75 is made of catoptron and synthetic prisms etc.
Image feature test section 2 and signal of video signal handling part 4 are owing to being the unit of pixel and handling fairly simple information processing, so generally realized by the hardware that can carry out high speed processing.On the other hand, control part 3 is owing to be frame unit and need handle with complex calculations and carry out video recording analysis, so generally realized by the software that uses CPU etc.
The light quantity of＜aperture 72 is regulated 〉
The control part 3 of first embodiment is according to the detection signal that generates in image feature test section 2, generates the fader control data of the switching that is used for controlling aperture 72 as shown below like that.
Fig. 3 is that expression is accompanied by the switching of aperture 72 and the figure of light quantity by aperture 72.Dot the light quantity that produces from light source 71, be in other incomplete structures between light source 71 and the aperture 72.
Fig. 3 (A) expression makes aperture 72 be the state of standard-sized sheet, and the whole of light quantity that aperture 72 produces light source 71 pass through.That is, the light quantity that incides in the projection lens 76 equals the light quantity that light source 71 produces.State after aperture 72 is dwindled in Fig. 3 (B) expression, by aperture 72 is dwindled, the light quantity by aperture 72 becomes and lacks than the light quantity of sending from light source 71.
Fig. 4 is the figure of expression from an example of the detection signal of image feature test section 2 outputs.The detection signal of present embodiment is the histogrammic data of expression as narrating.It is 256 gray scales (8) that histogram detector 21 makes input luminance signal Y, uses its high-order 4, generates the histogram data H[i of 16 gray scales (gray scale " 0 "～" 15 ")] (i=0～15).Histogram when here, expression input signal of video signal is represented the image of people under starry sky.
The transverse axis of Fig. 4 is represented gray scale i (i=0～15), and the longitudinal axis is represented the histogram data H[i of the input luminance signal Y among each gray scale i].The histogram data (H[0], H[1]) that Fig. 4 represents gray scale " 0 " Yu the gray scale " 1 " of black-side at most, then in the middle gray zone with gray scale i=10 be peak value, the histogram data of gray scale before and after it is more.
Damping capacity Ldec is the ratio of the light quantity of being covered by aperture 72 by the switching of regulating aperture 72 shown in Fig. 3 (B) like that, can be with representing with respect to the light quantity light quantity of sending from light source 71, that send from light source 71 and the difference of light quantity by aperture 72.
Be under 0% the situation at damping capacity Ldec, identical by the light quantity of aperture 72 with the light quantity of sending from light source 71.Be under 100% the situation at damping capacity Ldec, the light quantity by aperture 72 is 0, and aperture 72 is states of full cut-off.
In the present embodiment, making damping capacity Ldec till ratio from 0 to the 1st value P1 (control starting point) as the gray scale " 0 " of black information and gray scale " 1 " (H[0]+H[1]) is 0%, till the 1st value P1 to the 2 value P2, make damping capacity Ldec be increased to predetermined value L1 from 0%, be worth from the 2nd that to make damping capacity Ldec till the 3rd value be certain value L1, make damping capacity Ldec be increased to 100% till being worth 1 from the 3rd from certain value L1.That is,, be made as light quantity by aperture 72 such damping capacity Ldec that tails off along with the ratio (black information) of the gray scale that is equivalent to black becomes big.
The aperture control data be fed in the D/A transformation component 6 and by the D/A conversion, export to aperture drive division 79.Aperture drive division 79 drives aperture 72 according to the aperture control data of simulating signal.Control part 3 and aperture drive division 79 are fader control portions of control aperture 72 (light quantity adjusting portion).
As shown in Figure 5, in the present embodiment, because damping capacity Ldec is set at, the light quantity that tails off, promptly incides in the projection lens 76 by the light quantity of aperture 72 tails off along with input signal of video signal deepening (ratio that is equivalent to the gray scale of black becomes big), so can prevent from the image of dark to become eye-catching from the spilling of light of light source 71.
＜link and handle in the signal of video signal of fader control
For example scene, the people who represents to narrate the star of such night sky at the input signal of video signal is under the situation of the scene in the dark, if only carry out the fader control of above-mentioned aperture 72 light quantity of the signal of video signal integral body that incides in the projection lens 76 is tailed off, invisible problem that the radiance that star then can take place loses, people's face becomes.Thereby, need be accompanied by the processing of the input luminance signal Y of middle brightness～high brightness (middle gray zone) that fader control correction is equivalent to star and people's face.
So, as with the correction of fader control interlock in the processing of input luminance signal Y of brightness～high brightness, carry out the processing of (1) described later enhancement process (emphasizing contour processings) and (2) dynamic gamma.In addition, as described later, if control aperture 72 then white balance is destroyed, so would also carry out the processing that (3) revise white balance.In the present embodiment, then represent that with the input signal of video signal situation that the people is in the image starry sky under is an example, the processing of (1)～(3) is described successively.
(1) enhancement process
Enhancement process is to emphasize the processing of the profile of signal of video signal.Enhancement process generally is to the additional method of taking composition (シ ユ-ト composition) of signal of video signal, in addition, by regulating the gain of taking composition, the degree of emphasizing that can adjustment profile.
In the present embodiment, enhancement process is undertaken by enhancement process portion 41.The structure of enhancement process portion 41 is owing to being known structure, so omit detailed explanation.
The enhancement process method of expression present embodiment in Fig. 6.Control part 3 generates the enhancing data based on the detection signal of supplying with from image feature test section 2 according to Fig. 6.Enhancement process portion 41 carries out enhancement process according to the enhancing data from control part 3 inputs to the input signal of video signal that is supplied to.
The transverse axis of Fig. 6 is represented the ratio (black information) of the total (H[0]+H[1]) of the histogram data of gray scale " 0 " and gray scale " 1 " with respect to the total of the histogram data of all gray scales, and the longitudinal axis represents to take the recruitment of the horizontal gain GH and the vertical gain GV of composition.The ratio that the control part 3 of present embodiment generates total along with the gray scale that is equivalent to black " 0 " and gray scale " 1 " (H[0]+H[1]) becomes big, is the image deepening, and horizontal gain GH and vertical gain GV be change such enhancing data greatly more.
In the present embodiment, making the recruitment of horizontal gain GH till ratio from 0 to the 1st value P11 (control starting point) as the gray scale " 0 " of black information and the total of gray scale " 1 " (H[0]+H[1]) is 0, make till the 1st value P11 to the 2 value P12 horizontal gain GH be increased to predetermined value H1 (limits value H1) from 0, making horizontal gain GH till the 2nd value P12 to 1 is limits value H1.
That is,, control part 3 represents that additional levels gain G H is not more than the 1st value P11 then the enhancing data of the additional horizontal gain GH that is scheduled to till black information from 0 to the 1st value P11 if generating.And then, be worth the enhancing data that generate the horizontal gain GH that represents added limitations value H1 till 1 at black information from the 2nd.
About vertical gain GV too, making the recruitment of vertical gain GV till black information from 0 to the 1st value P11 is 0, make till the 1st value P11 to the 2 value P12 vertical gain GV be increased to predetermined value V1 (limits value V1) from 0, making vertical gain GV till the 2nd value P12 to 1 is limits value V1.
The 1st value P11, the 2nd value P12, limits value H1 and limits value V1 can at random set, and limits value V1 preferably is set at the value littler than limits value H1.Here, make horizontal gain GH identical with the change point (the 1st value P11, the 2nd value P12) of the variation of the increase of vertical gain GV, but also can be different.In addition, control part 3 is handled by time shaft described later and is suppressed the discontinuous of each gain.
Here, the limits value H1 of horizontal gain GH and the limits value V1 of vertical gain GV being separated is because vertical enhancement process is bigger to the visual impact of image than horizontal enhancement process.Set forr a short time by limits value V1,, also emphasized that by enhancement process point-like is present in the part of the star in the night sky, make it glittering brightly and can see even dwindle light quantity than the limits value H1 of horizontal gain GH with vertical gain GV.And then, also less to the influence of the image beyond the star.
(2) dynamic gamma is handled
Fig. 7 (A) is the histogram data of input signal of video signal, and is identical with Fig. 4.The luminance signal composition Y of input signal of video signal is being distributed with histogram data H[i based on gray scale " the 0 "～gray scale " 2 " of darker image with based on gray scale " the 7 "～gray scale of brighter image in " 11 "].Here, star and people's face is equivalent to gray scale " 7 "～gray scale " 11 ".Input luminance signal Y is under the situation of the image feature of the large percentage with the gray scale that is equivalent to black " 0 " such shown in Fig. 7 (A), gray scale " 1 ", if only carry out fader control, then the light quantity with respect to input signal of video signal integral body tails off as narrating, so be equivalent to the also deepening of output image signal of gray scale " 7 "～gray scale " 11 ".
So, signal of video signal is implemented the dynamic gamma of the gray scale of raising gray scale " 7 "～gray scale " 11 " and is handled.
Dynamic gamma is handled and is undertaken by gray scale correction portion 42.Gamma processor 31 controls that the gray scale correction portion is 42 controlled 3.
Voff＝Ldec×Hrat×G……(2)
Here, Hrat represents the ratio of the histogram data of gray scale i with respect to the total of the histogram data of all gray scales, and G represents offset gain.Offset gain G is used for ratio coupling (ス ケ-Le closes わ せ), can at random set.Damping capacity Ldec uses the amount of having obtained.
Off-set value Voff links with damping capacity Ldec shown in (2) formula.Damping capacity Ldec becomes big more owing to be equivalent to the input signal of video signal of large percentage of the gray scale of black, as shown in Figure 5 so off-set value Voff also becomes big thereupon.Off-set value Voff also with the ratio Hrat interlock of the histogram data of gray scale i, so if the large percentage of the histogram data of the gray scale i of expectation then become big.
Each off-set value Voff of gray scale " 7 "～gray scale " 11 " of expression input luminance signal Y among Fig. 7 (B).Transverse axis is represented input luminance signal Y is divided into each gray scale i after 16 grades, and the longitudinal axis is represented the off-set value Voff additional to the gray scale of the gray scale " 7 " of the 1st gray scale correction data～gray scale " 11 ".
In the present embodiment, gamma processor 31 is obtained and is used for each off-set value Voff additional to gray scale " 7 "～gray scale " 11 ".The gray areas that the image quality raising is visually wanted in the zone of the gray scale of additional offset value Voff as long as at random select just can, preferably select the middle gray zone.As long as it is just passable that selected gray areas is set in advance in the gamma processor 31.
In processing, if for example histogram data concentrates among 1 gray scale i then Hrat becomes big, so the additional off-set value Voff of this gray scale i is also become big based on the predetermined gray areas off-set value Voff of obtaining of above-mentioned (2) formula.Thereby only the part of the 2nd gray scale correction data (the only part of gray scale i) gray scale (brightness) is raised, and might visually can pick out the differential of brightness.
For fear of this differential generation, gamma processor 31 makes adjacent gray scale, and (i, i+1) residual quantity of the off-set value Voff between is that the following residual quantity restriction of predefined value is handled.
The residual quantity restriction is handled and is used following (3) formula to carry out.
If(Pmin+Lim)<Pmax
then?Pmax＝Pmin+Lim……(3)
Here, (establish less deviation value Voff is Pmin to more adjacent gray scale for i, i+1) the off-set value Voff between, and establishing bigger off-set value Voff is Pmax.Lim is predefined residual quantity limits value, is the value that can set arbitrarily.
Fig. 8 (A) and Fig. 7 (B) are same, each off-set value Voff of expression gray scale " 7 "～gray scale " 11 ".Off-set value Voff after the restriction of the off-set value Voff residual quantity shown in Fig. 8 (A) is handled in Fig. 8 (B) expression.
In the present embodiment, for gray scale " 7 "～gray scale " 11 " and a back gray scale that comprises the previous gray scale of minimal gray " 7 " and maximum gray scale " 11 ", gray scale " 6 "～gray scale " 12 ", carried out the residual quantity restriction of (3) formulas respectively and handled.By Fig. 8 (B) as can be known, in the present embodiment, the off-set value Voff of gray scale " 10 " residual quantity of having carried out like that shown in dotted line is limited processing.
The gray scale of carrying out residual quantity restriction processing is preferably the whole gray scales and the previous gray scale of the minimal gray in whole gray scale and the back gray scale of maximum gray scale that comprise additional offset value Voff as present embodiment.
Handle by carrying out the residual quantity restriction, (i, i+1) the off-set value Voff's between is poor, can carry out level and smooth gray scale correction can to reduce each gray scale.
Gray scale correction portion 42 is obtained from control part 3 the 1st gray scale correction data has been added the 2nd gray scale correction data behind the offset data, revise input luminance signal Y gray scale and as the output of output luminance signal.In addition, as shown in Figure 5, under the situation of ratio from 0 to the 1st value P1 of the gray scale that is equivalent to black, damping capacity Ldec is 0, and off-set value Voff also is 0.At this moment, gray scale correction portion 42 is supplied with the 1st gray scale correction data.
Represent to represent based on the gray scale fair curve that has added the 2nd gray scale correction data behind the offset data with solid line with single-point line among Fig. 9 for characteristic (gray scale fair curve) based on the output luminance signal of the input luminance signal Y of the 1st gray scale correction data.The transverse axis of Fig. 9 is represented input luminance signal Y, and the longitudinal axis represents to export luminance signal.Handle by above-mentioned dynamic gamma, can shown in solid line, promote the brightness (middle brightness～high brightness) of centre～white side like that, the brightness that can keep people's skin and star.
By enhancement process and the dynamic gamma processing of gray scale correction portion 42 and the fader control interlock of aperture 72 that makes the enhancement process portion of having narrated 41, even the small histogram data H[i because of area like that at star] the less situation of ratio under, the brightness that also can keep signal of video signal fully.
(3) white balance is handled
The look decomposition portion 73 of present embodiment has the 1st dichronic mirror, the 2nd dichronic mirror and a plurality of catoptron, will be the B light (LB) of short wavelength side and the R light (LR) of long wavelength side+G light (LG) by the 1st dichronic mirror beam split from the light of light source 71 incidents.Be the G light (LG) of short wavelength side and the R light (LR) of long wavelength side by the 2nd dichronic mirror with R light+G light beam split again, the light path of each light LR, LG, LB bent, arrive each optical modulation element 74R, 74G, 74B by a plurality of catoptrons.
As narrating, regulate light quantity from the light that look synthetic portion 75 penetrates, incide in the projection lens 76 by aperture.At this moment, if stop down 72, then the balance of each light modulated LRm, LGm of the light that penetrates from the synthetic portion 75 of look, LBm is different with the balance of each light modulated LRm, LGm, LBm inciding projection lens 76.For example, if light modulated LBm reduces, the B signal that then incides the signal of video signal in the projection lens 76 tails off, and greening becomes.
The aperture opening ratio of expression aperture 72 and the relation of the percent of pass of the light quantity of each light LR, the LG after the beam split, LB in look decomposition portion 73 among Figure 10.The percent of pass of light quantity is that each light LR, LG of 100% o'clock, the percent of pass of LB are obtained as 100% with the aperture opening ratio of aperture 72.Along with the aperture opening ratio of aperture 72 diminishes, discrete (deviation) takes place in the percent of pass of the light quantity of each light, if the aperture opening ratio of aperture 72 is below 50%, then percent of pass is the relation of LB＜LG＜LR as can be known.That is, the percent of pass of LB becomes minimum.
So, in element drives portion 78, carry out white-balance correction and handle.Element drives portion 78 carries out white-balance correction to each signal of video signal R, G, B so that incide light modulated LRm, the LGm of the light in the projection lens 76, the light quantity of LBm becomes LRm=LGm=LBm.White-balance correction is handled as described later, is corresponding to being undertaken by the light quantity of aperture 72.
Element drives portion 78 be by control part 3 obtain light quantity correction data, will be according to light quantity correction data correction behind each signal of video signal R, G, the B respectively revise signal of video signal SR, SG, SB supplies to the white-balance correction portion among optical modulation element 74R, 74G, the 74B.
In the present embodiment, be that benchmark is implemented to revise with the light quantity of the LB that light quantity becomes minimum along with the fader control of aperture 72 as mentioned above, to reduce the light quantity of LR, LG.Thereby, will reduce the R signal, the such light quantity correction data of G signal supply in the element drives portion 78, so that it is that benchmark carries out white-balance correction with the B signal.
Expression is to an example of the light quantity correction of R signal among Figure 11, and same, expression is to an example of the light quantity correction of G signal among Figure 12.Control part 3 is based on the damping capacity Ldec that has generated, and obtains light quantity modified value to R signal and G signal by Figure 11 and Figure 12.To the light quantity modified value of B signal owing to be the benchmark light quantity with LB as described above, so do not ask.
The transverse axis of Figure 11 represents that (0: full cut-off, 100: standard-sized sheet), the longitudinal axis is represented the light quantity modified value FR to the R signal bias for the aperture opening ratio (%) of aperture 72.As narrating, be that the aperture opening ratio of aperture 72 is 100% under 0% the situation at damping capacity Ldec, be the aperture opening ratio of aperture 72 is 0% under 100% the situation at damping capacity Ldec.
Too, transverse axis represents that (0: full cut-off, 100: standard-sized sheet), the longitudinal axis is represented the light quantity modified value FG to the G signal bias for the aperture opening ratio (%) of aperture 72 among Figure 12.Corresponding to the amount of the light that passes through aperture 72, light quantity modified value FR and light quantity modified value FG change.
The expression that is generated by control part 3 is fed in the element drives portion 78 to the light quantity modified value FR of R signal with to the light quantity correction data of the light quantity modified value FG of G signal.Control part 3 is the white balance control parts corresponding to the correction of the white balance of controlling white-balance correction portion 78 by the light quantity of aperture 72.
Element drives portion 78 generates based on light quantity correction data and respectively revises signal of video signal SR, SG, SB.Revising signal of video signal SR and be being input to the signal behind the R signal bias light quantity modified value FR in the element drives portion 78, revising signal of video signal SG is to being input to the signal behind the G signal bias light quantity modified value FG in the element drives portion 78.Revise signal of video signal SB and be be input to element drives portion 78 in the identical signal of B signal.In addition, control part 3 is handled by time shaft described later and is suppressed the discontinuous of light quantity modified value.
Each revises signal of video signal SR, SG, SB is input to respectively among optical modulation element 74R, 74G, the 74B.Each optical modulation element 74R, 74G, 74B are modulated to each light modulated LRm, LGm, LBm with each light LR, LG, LB based on each correction signal of video signal SR, SG, SB, output in the look synthetic portion 75.
(4) time shaft is handled
It is to control the rate of change of light quantity so that people's eyes can not perceive the processing of the variation of discontinuous brightness under the situation of dynamically controlling aperture 72 by every field or every frame that time shaft is handled.When the renewal of aperture control data, the time shaft that passes through low pass filter (LPF) that carries out is as shown in Figure 13 handled, and controls so that the rate of change of the light quantity of each frame can not become more than the predetermined value.And then, control so that the brightness composition of signal of video signal and/or profile varying rate become and the identical time constant of light quantity variation.
Figure 13 (A) is illustrated in the IIR structure of filter of carrying out filter process on the time-axis direction.The IIR filtrator is equipped in the control part 3, suppress to each of enhancement process portion 41, gray scale correction portion 42, element drives portion 78 and aperture drive division 79 handle discontinuous.Transmission characteristic is following formula, and k is regression coefficient (k＜1).
Y(z)/X(z)＝1/(1—k·z—1)，k＝1—1/2
n ……(4)
The performance plot of Figure 13 (B) expression IIR filtrator.Transverse axis is represented the field number, and the longitudinal axis is represented parameter n=4,5,6,7,8 transmission characteristic.The value of parameter n by deriving regression coefficient k, the response speed that can easily regulate the aperture control data.The value of parameter n can at random be set, and uses n=2, about 3 (not shown) in the present embodiment.
Handle by above-mentioned interlock, can control aperture 72 in adaptability ground corresponding to the brightness of signal of video signal, in addition, can keep the state of the brightness of white side to reproduce the image of having emphasized black-side down, can access the effect that the contrast sense increases, improved visual image quality.
＜the second embodiment 〉
Figure 14 is the block diagram as the image display 20 of second embodiment of the present invention.Give identical label and omit explanation for the part identical with image display 10.
In the image display 10 of first embodiment, will import signal of video signal and be input in the image feature test section 2, generate detection signal based on the input signal of video signal.On the other hand, in the image display 20 of present embodiment, after will importing signal of video signal and being input in the enhancement process portion 410, supply in the image feature test section 210.Thereby image feature test section 210 generates detection signal based on the enhancement process having implemented to have narrated, the signal of video signal that added predetermined shooting composition.The generation method of detection signal and the image feature test section 2 of image display 10 are same.
＜the three embodiment 〉
Figure 15 is the block diagram as the image display 30 of the 3rd embodiment of the present invention.Image display 30 is liquid crystal indicators.Give identical label and omit explanation for the part identical with image display 10.
Image display 30 possesses PWM control part 60 and display part 8.Display part 8 is liquid crystal module portions, has driver 81, backlight control portion 82, gate signal line drive division 83, data signal line drive division 84, display panels 85 and backlight 86.
Signal of video signal by 4 outputs of signal of video signal handling part is fed in the driver 81.Display panels 85 possesses a plurality of pixels 851, is connecting data signal line drive division 84 on the data signal line of pixel 851, is connecting gate signal line drive division 83 on gate signal line.The signal of video signal that is imported in the driver 81 is supplied with to gate signal line drive division 83.Driver 81 is written to moment in the display panels 85 by gate signal line drive division 83 and 84 controls of data signal line drive division with signal of video signal.
Backlight 86 are configured in the rear side of display panels 85.Backlight 86 driven by backlight control portion 82.Be used for making backlight 86 luminous driving pulses by 82 supplies of 60 pairs of backlight control portions of PWM control part.The backlight 86 a plurality of light emitting diodes (LED) by for example R, G, B constitute.Here, make backlight 86 for LED, by having carried out the driving pulse driving LED after the pulse amplitude modulation, but also can flow to the luminosity that current value among the LED is controlled LED by adjusting.In addition, backlight 86 be not limited to LED.
In addition, though diagram not, the horizontal-drive signal and the vertical synchronizing signal of separating from the input signal of video signal are fed into driver 81 and the backlight control portion 82, show corresponding to the image of each frame of display panels 85 and regulate backlight 86 brightness.
The control part 3 of the 3rd embodiment generates the fader control data according to the detection signal from 2 outputs of image feature test section according to Figure 16, supplies in the PWM control part 60.In addition, as narrating, generate enhancing data, offset data according to detection signal.
Figure 16 is the figure of the damping capacity of expression backlight 86 light quantity.Transverse axis is represented the ratio (black information) of the total (H[0]+H[1]) of the histogram data of gray scale " 0 " and gray scale " 1 " with respect to the total of the histogram data of all gray scales, and the longitudinal axis is represented backlight 86 damping capacity.Be that backlight 86 for closing under 100% the situation in damping capacity.
PWM control part 60 obtains the fader control data, generates R, G, B driving pulse separately.Backlight control portion 82 is the light quantity adjusting portions of regulating backlight 86 light quantity according to the driving pulse that is generated by PWM control part 60.
＜the four embodiment 〉
Though diagram not also can be in the image display 30 of the 3rd embodiment be made image feature test section 210 and enhancement process portion 410 in the image display 20 of second embodiment with image feature test section 2 and enhancement process portion 41.The input signal of video signal in being imported into enhancement process portion 410 after, be fed in the image feature test section 210.
The image display of first embodiment of the invention～the 4th embodiment can carry out corresponding to the fader control of the signal of video signal of input and links in the processing of the signal of video signal of fader control.Therefore, signal of video signal is owing to can so contrast uprises, be preferred with black as original black, white is showed as original white.
Claims (7)
1, a kind of image display is characterized in that, possesses:
Display part shows the signal of video signal of importing;
Light source produces the light that is used for showing at above-mentioned display part above-mentioned signal of video signal;
The light quantity adjusting portion, the light quantity of regulating above-mentioned light source;
The histogram generating unit according to the luminance signal composition of above-mentioned signal of video signal, will be divided into a plurality of gray scales by every preset time unit from the minimum brightness to the high-high brightness, generate the histogram data of the distribution of each gray scale of expression;
Maintaining part keeps the 1st gray scale correction data, and the decision of the 1st gray scale correction data is with respect to the characteristic of the output gray level of the input gray level of above-mentioned signal of video signal
Fader control portion according to above-mentioned histogram data, controls above-mentioned light quantity adjusting portion, so that along with the ratio of the gray scale of every above-mentioned preset time unit representation black becomes the light quantity that reduces above-mentioned light source greatly;
The additional data generating unit, generation is used for for the gray scale in the predetermined middle gray zone of improving above-mentioned signal of video signal by each gray scale in above-mentioned middle gray zone data to the additional usefulness of above-mentioned the 1st gray scale correction data, promptly becomes big additional data according to above-mentioned histogram data greatly along with the ratio of the gray scale of every above-mentioned preset time unit representation black becomes; And,
The gray scale correction portion according to above-mentioned the 1st gray scale correction data or the 2nd gray scale correction data that above-mentioned the 1st gray scale correction data have been added above-mentioned additional data, is revised the gray scale of above-mentioned signal of video signal;
Also possess:
Enhancement process portion carries out the emphasizing contour of above-mentioned signal of video signal;
Control part is controlled above-mentioned enhancement process portion, so that increase along with the ratio of the gray scale of every above-mentioned schedule time unit representation black becomes the emphasizing contour that makes greatly above-mentioned signal of video signal according to above-mentioned histogram data.
2, a kind of image display is characterized in that, possesses:
Display part shows the signal of video signal of importing;
Light source produces the light that is used for showing at above-mentioned display part above-mentioned signal of video signal;
The light quantity adjusting portion, the light quantity of regulating above-mentioned light source;
Enhancement process portion carries out the emphasizing contour of above-mentioned signal of video signal;
The histogram generating unit, the luminance signal composition according to the signal of video signal after emphasizing through above-mentioned enhancement process contouring will be divided into a plurality of gray scales by every preset time unit from the minimum brightness to the high-high brightness, generate the histogram data of the distribution of each gray scale of expression;
Maintaining part keeps the 1st gray scale correction data, and the decision of the 1st gray scale correction data is with respect to the characteristic of the output gray level of the input gray level of above-mentioned signal of video signal;
Fader control portion according to above-mentioned histogram data, controls above-mentioned light quantity adjusting portion, so that along with the ratio of the gray scale of every above-mentioned preset time unit representation black becomes the light quantity that reduces above-mentioned light source greatly;
The additional data generating unit, generation is used for for the gray scale in the predetermined middle gray zone of improving above-mentioned signal of video signal by each gray scale in above-mentioned middle gray zone data to the additional usefulness of above-mentioned the 1st gray scale correction data, promptly becomes big additional data according to above-mentioned histogram data greatly along with the ratio of the gray scale of every above-mentioned preset time unit representation black becomes; And,
The gray scale correction portion according to above-mentioned the 1st gray scale correction data or the 2nd gray scale correction data that above-mentioned the 1st gray scale correction data have been added above-mentioned additional data, is revised the gray scale of above-mentioned signal of video signal;
Control part is controlled above-mentioned enhancement process portion, so that increase along with the ratio of the gray scale of every above-mentioned schedule time unit representation black becomes the emphasizing contour that makes greatly above-mentioned signal of video signal according to above-mentioned histogram data.
3, image display as claimed in claim 1 or 2 is characterized in that, the signal of video signal of above-mentioned enhancement process portion after with emphasizing contour supplies in the above-mentioned gray scale correction portion.
4, as claim 1 or 2
Image display, it is characterized in that above-mentioned additional data generating unit generates above-mentioned additional
According to, so that in the gray areas that comprises above-mentioned middle gray zone, the residual quantity of the above-mentioned additional data between adjacent gray scale is below the predefined value.
5, image display as claimed in claim 1 or 2 is characterized in that,
Have:
Optical modulation element is according to the light of above-mentioned signal of video signal modulation incident; And
The white balance of above-mentioned signal of video signal is revised by white-balance correction portion, supplies in the above-mentioned optical modulation element;
Above-mentioned light source produces the above-mentioned light that incides in the above-mentioned optical modulation element;
Above-mentioned light quantity adjusting portion is to regulate the aperture of the amount of above-mentioned light;
Also has the white balance control part of correction of controlling the white balance of above-mentioned white-balance correction portion according to the amount of the light by said aperture.
6, image display as claimed in claim 1 or 2 is characterized in that,
Above-mentioned display part has display panels;
Above-mentioned light source is the backlight that produces the light that incides above-mentioned display panels.
7, a kind of image display method is characterized in that,
According to the luminance signal composition of the signal of video signal that is shown in display part, by every preset time list
To from the minimum brightness to the high-high brightness, be divided into a plurality of gray scales, generate the histogram data of the distribution of each gray scale of expression;
According to above-mentioned histogram data, obtain the ratio of the gray scale of every above-mentioned preset time unit representation black;
Along with the ratio change of the gray scale of representing above-mentioned black is big, reduce to be used for showing the light quantity that the light source of the light of above-mentioned signal of video signal sends at above-mentioned display part from generation;
Control, so that improve the gray scale in the predetermined middle gray zone the above-mentioned signal of video signal along with reducing the light quantity of sending from above-mentioned light source;
Also control, so that increase the degree of the emphasizing contour that above-mentioned signal of video signal is implemented along with reducing the light quantity of sending from above-mentioned light source.
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| JP166699/2006 | 2006-06-15 | ||
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| JP5187789B2 (en) * | 2009-03-27 | 2013-04-24 | Ｎｅｃディスプレイソリューションズ株式会社 | Video display device and video correction method |
| JP2011250229A (en) * | 2010-05-28 | 2011-12-08 | Sony Corp | Video signal processing apparatus, video signal processing method, and computer program |
| JP2012189764A (en) * | 2011-03-10 | 2012-10-04 | Panasonic Liquid Crystal Display Co Ltd | Liquid crystal display device |
| CN102543024B (en) * | 2012-02-03 | 2014-04-02 | 福州瑞芯微电子有限公司 | Control circuit for dynamic backlight balance |
| CN104078020B (en) * | 2014-07-17 | 2016-08-17 | 深圳市华星光电技术有限公司 | Liquid crystal indicator, four color transducers and RGB data are to the conversion method of RGBW data |
| CN107888891B (en) * | 2016-09-30 | 2020-04-03 | 海信集团有限公司 | Image projection display method and optical engine |
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