CN101499250A - Liquid crystal display device controlling method, liquid crystal display device, and electronic apparatus - Google Patents
Liquid crystal display device controlling method, liquid crystal display device, and electronic apparatus Download PDFInfo
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- CN101499250A CN101499250A CNA200810177287XA CN200810177287A CN101499250A CN 101499250 A CN101499250 A CN 101499250A CN A200810177287X A CNA200810177287X A CN A200810177287XA CN 200810177287 A CN200810177287 A CN 200810177287A CN 101499250 A CN101499250 A CN 101499250A
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Abstract
The present invention relates to a liquid crystal display device controlling method, a liquid crystal display device, and an electronic apparatus, which is capable of appropriately controlling a viewing angle property in accordance with various images using a primary light outgoing property of a liquid crystal panel. The inventive display device (10) is provided with: an image processing unit (16) (an image correction unit), an liquid crystal panel (110), a lighting unit (140), a power supply unit (20) (a lighting brightness adjustment unit), and a CPU (12) (control unit). The liquid crystal panel panel has the light outgoing property that it has a low viewing angle high gray-scale area located at the high gray-scale side higher than the benchmark gray-scale area in the low viewing angle scope; and a higher viewing angle high gray-scale area, located at the high gray-scale side higher than the benchmark gray-scale area in the high viewing angle scope higher than the low viewing angle scope, and having light outgoing property difference between adjacent gray-scales lower than that of the low viewing angle high gray-scale area. Under an energy-saving lighting control mode of improving the luminance of the image data through luminance correction and simultaneously reducing the lighting brightness of the lighting unit according to the correction amount, the correction amount of the luminance correction according to the data at the high gray-scale side higher than the benchmark gray-scale area in the image data before luminance correction is reduced, or the luminance correction is not carried out.
Description
Technical field
The present invention relates to control method, liquid crystal indicator and the electronic equipment of liquid crystal indicator, relate in particular to the technology of the visual angle of liquid crystal indicator being controlled by the adjustment of the correction of input image data and the briliancy of throwing light on.
Background technology
In general, have display part in liquid crystal indicator, this display part has the liquid crystal panel and the lighting unit that is used for this liquid crystal panel irradiating illumination light that can set the light outgoing characteristic of pixel by the state of orientation of control liquid crystal.Structure as the typical display part liquid crystal indicator of this liquid crystal indicator, generally be that lighting unit is configured in the structure that the behind of transmissive type liquid crystal panel forms as backlight, but also the someone consider lighting unit is used, liquid crystal panel is made as front light-source the structure of reflection-type.
As everyone knows, for the visual angle interdependence that for the light of liquid-crystal apparatus outgoing, has based on the state of orientation of liquid crystal molecule, in general can be become clear in low angular field of view (face side), the contrast preferable image, but reduce in high angular field of view (side) image deepening, contrast, can not obtain sufficient visual identity.And, known a kind of display device, it constitutes, utilize the characteristic of such liquid crystal panel, visual identity side configuration viewing angle control liquid crystal panel showing with liquid crystal panel switches the state of orientation of viewing angle control with liquid crystal panel, thereby can switch narrow field-of-view mode and wide viewing angle pattern.And, as this display device, in order further to improve the performance of handoffs of above-mentioned pattern, put down in writing as following patent documentation 1, as the method that sees through of the image in the high angular field of view that prevents under the narrow field-of-view mode, the someone proposes to reduce the method for the illumination briliancy of lighting unit (backlight) under narrow field-of-view mode.
On the other hand, in above-mentioned liquid crystal indicator, the gray-scale value of the view data that constitutes and import shows the gray scale of regulation accordingly by each pixel, proofread and correct but also constitute at gray-scale value sometimes, show the gray scale of regulation accordingly by each pixel with the gray-scale value of view data after proofreading and correct to view data.For example, known, make the gamma correction that increases from the gray-scale value of the briliancy data of view data gained by execution, improve the light exitance (transmissivity or reflectivity) of liquid crystal panel, lower and the method (for example, with reference to following patent documentation 2) of seeking power saving of the illumination briliancy that correspondingly makes simultaneously lighting unit.
In addition, the color of also known part by changing display image makes the illumination luminance variations of lighting unit simultaneously, thereby can switch the display device (for example, with reference to patent documentation 3) of narrow field-of-view mode and wide viewing angle pattern.
Patent documentation 1: the spy opens the 2007-11316 communique
Patent documentation 2: the spy opens the 2006-306532 communique
Patent documentation 3: the spy opens the 2007-163823 communique
But, in the method that above-mentioned patent documentation 1 is put down in writing, also must dispose the viewing angle control liquid crystal panel separately with liquid crystal panel, so the display body thickening exists and miniaturization, the slimming of display device in recent years such problem that runs in the opposite direction except showing.
In addition, in the method that above-mentioned patent documentation 2 is put down in writing, can seek province's electrification of lighting unit, but the light exitance that improves liquid crystal panel by gamma correction makes the illumination briliancy of lighting unit reduce on the contrary, seek province's electrification and integral body is kept the figure briliancy, so exist because above-mentioned gamma correction viewing angle characteristic changes such problem easily.Particularly, in general liquid crystal panel, difference in the light exitance of high gray areas between the adjacent gray scale of low angular field of view (face side) is bigger, but the difference of the light exitance between the adjacent gray scale of high angular field of view (side) is less, so when the correcting value of gamma correction was big, the image light exitance in high angular field of view reduced accordingly, the visual angle narrows down.On the other hand, when this correcting value hour, it is so narrow that the visual angle does not become, thus bigger with the correcting value variation of viewing angle characteristic accordingly, have the unstable such problem of viewing angle characteristic that shows.
And, in the method that above-mentioned patent documentation 3 is put down in writing, utilize the width at the display characteristic control visual angle of liquid crystal panel, but this gray scale with the color of the part of change display image is a prerequisite, so can control the visual angle of the display part of particular color, but have this problem of visual angle width that is difficult to control reliably general integral image.
Summary of the invention
At this, the present invention addresses the above problem, and its purpose is, thereby realizes that the light outgoing characteristic of the script by utilizing liquid crystal panel can suitably control the new construction of viewing angle characteristic according to various images.
In view of such actual conditions, the invention provides a kind of control method of liquid crystal indicator, this liquid crystal indicator has liquid crystal panel, this liquid crystal panel possesses the pixel that shows with the corresponding image of gray-scale value and forms, and this control method comprises: set and contain first gray areas of a plurality of gray-scale values and contain second gray areas that is in a ratio of a plurality of gray-scale values of high gray scale with the contained gray-scale value of described first gray areas; Belong at gray-scale value under the situation of described first gray areas, described view data is improved first gamma correction of the brightness of described image based on view data; And belong at the gray-scale value based on view data under the situation of described second gray areas, described view data is not carried out gamma correction, perhaps described view data is carried out second gamma correction of correcting value less than the correcting value of described first gamma correction.
In general liquid crystal indicator, with the corresponding image of the view data of low gray scale side, the visual angle interdependence of light exitance is less, the corresponding image of view data of opposite and high gray scale side, and the visual angle interdependence of light exitance is bigger.That is, showing slinkingly when showing, when the front is seen when seeing from the side the different of brightness be not so big, but when brighter demonstration, when the front is seen when seeing from the side the different changes of brightness big.
According to this invention, be the view data of the contained gray-scale value of first gray areas to low gray scale side in the view data before the gamma correction, that the visual angle interdependence is less, carry out the first bigger gamma correction of correcting value.Thus, view data changes (shift) paramount gray scale side, so display image brightens.On the other hand,, do not carry out gamma correction, or carry out second gamma correction of correcting value less than the correcting value of first gamma correction to the view data of the contained gray-scale value of second gray areas of the bigger high gray scale side of visual angle interdependence.Therefore, the view data of high gray scale side does not almost change.Therefore, the visual angle interdependence of display image, with proofread and correct before compare almost and do not change.That is narrowization that, suppresses the visual angle.Its result can access the bright display image of the variation that suppresses the viewing angle characteristic that image shows as a whole.
In a mode of the present invention, possess a plurality of described pixels, a plurality of view data based on the described a plurality of described pixels of input, determine a described gray-scale value as representative, belong under the situation of described first gray areas at a described gray-scale value, a plurality of view data of importing described a plurality of pixels are carried out described first gamma correction, belong under the situation of described second gray areas at a described gray-scale value, a plurality of pixel datas of importing described a plurality of pixels are not carried out gamma correction, perhaps described a plurality of pixel datas are carried out described second gamma correction of correcting value less than the correcting value of described first gamma correction.Here, a so-called gray-scale value as representative, mean than the tonal range frequency height under the gray-scale value of other view data in the input image data, belong to the gray-scale value of the tonal range of the summary picture material that determines this view data, perhaps the typical value of the mean value of the gray scale of above-mentioned view data, median etc.Determine the mode of gamma correction by the gray-scale value that becomes this representative, thereby can proofread and correct integral image uniformly, can keep picture material reliably.
In this case, the gray-scale value of the representative of the described view data before becoming described gamma correction compares that described benchmark gray areas is in low gray scale side, the gray-scale value that becomes the representative of the described view data behind the described gamma correction is compared under the situation that the benchmark gray areas is in high gray scale side, reduce correcting value, perhaps do not carry out gamma correction.Thus, its result, be at the gray-scale value behind the common gamma correction under the situation of the high gray areas in high visual angle, the situation that is in the high gray areas in high visual angle with gray-scale value before the gamma correction is identical, the possibility that has the picture contrast reduction in high angular field of view, therefore, reduce correcting value in this case or do not carry out gamma correction, thereby can suppress the variation of viewing angle characteristic.
In addition, in the control method of above-mentioned liquid crystal indicator of the present invention, described liquid crystal indicator, also possesses the lighting device that described liquid crystal panel is thrown light on, described lighting device can be selected second state of light of second briliancy of first state of light of outgoing first briliancy and the light that the outgoing briliancy is lower than described first briliancy, when described second state, carry out described first or second gamma correction.
Reduce under the so-called battery saving mode that consumes electric power in the briliancy that reduces lighting device, be necessary with the lower amount of the briliancy of lighting device correspondingly, view data is carried out gamma correction, to guarantee the briliancy of display image.Control method of the present invention is applicable to battery saving mode, thereby even if under the situation that the briliancy of lighting device reduces, the bright display image of the variation of the viewing angle characteristic that also can be inhibited.
In addition, in the control method of above-mentioned liquid crystal indicator, when described first state, the 3rd gamma correction that can the brightness of described image be reduced to described view data.
When the higher state of the briliancy of lighting device, the also correction that can the brightness of display image be reduced to view data.That is,, thereby can carry out demonstration under the wider high field-of-view mode in visual angle by the little low gray scale side of the light exitance of the display image in paramount angular field of view of the transition in grayscale that makes display image and the low angular field of view.
Other the control method of liquid crystal indicator of the present invention, it is a kind of control method of liquid crystal indicator, this liquid crystal indicator has: possess and show liquid crystal panel that the pixel with the corresponding image of gray-scale value forms and the lighting device that described liquid crystal panel is thrown light on, the method is characterized in that, described lighting device, can select second state of light of second briliancy of first state of light of outgoing first briliancy and the light that the outgoing briliancy is lower than described first briliancy, when described first state, the 3rd gamma correction that the brightness of described image is reduced to described view data.
According to this invention, view data is made the gamma correction of brightness reduction.That is, make the view data of display image be converted to the little low gray scale side of light outgoing rate variance in high angular field of view and low angular field of view.Therefore, the viewing angle characteristic of liquid crystal indicator broadens.On the other hand, increase, prevent to show the reduction of briliancy by the briliancy that makes lighting device.
The control method of liquid crystal indicator of the present invention can be applicable to all liquid crystal indicators with visual angle interdependence.Especially preferably be applicable to the high liquid crystal indicator of visual angle interdependence of the liquid crystal indicator that for example uses TN (twisted nematic) liquid crystal, the liquid crystal indicator of ECB type or the liquid crystal indicator of STN type etc.Certainly, can not get rid of the little liquid crystal indicators of visual angle interdependence such as liquid crystal indicator that the present invention is applicable to vertical orientating type, lateral electric-field type.
In the invention described above, can be made as the scope that the visual angle is 0～20 degree with hanging down angular field of view, high angular field of view is made as the scope that the visual angle is 35～60 degree.Be not particularly limited the low angular field of view and the high angular field of view of liquid crystal panel, but usually aspect the viewing angle characteristic of TN (twisted nematic) liquid crystal, can be with above-mentioned scope as the correcting value of setting view data with reference to value.
The liquid crystal panel that control method of the present invention is used, in high angular field of view, the mean value of the light outgoing rate variance between the adjacent gray scale of high gray areas, than and the benchmark gray areas to be in a ratio of the mean value of the light exitance between the adjacent gray scale of low gray scale side (gray areas is hanged down at high visual angle) little.This characteristic is especially as the viewing angle characteristic of TN (twisted nematic) liquid crystal and obtain.In this case, in high angular field of view, the relative change of light exitance between the adjacent gray scale of comparing with the benchmark gray areas of low gray scale side is big, relative the diminishing of light exitance between the adjacent gray scale of comparing with the benchmark gray areas of high gray scale side.Therefore, causing poor (brightness poor) of the viewing angle characteristic of low angular field of view and high angular field of view to become bigger to the gamma correction of the gray-scale value on the benchmark gray areas under the power-saving control pattern, thus improved more under the power-saving control pattern to the inhibition of the gamma correction of high gray areas or the effect that stops.In addition, even if under light viewing angle control pattern, the light exitance of the high gray areas under the high angular field of view diminishes relatively, it is big that the light exitance of low gray areas becomes relatively, therefore, by the gamma correction of the low gray scale side of contrast benchmark gray areas, the reduced rate of comparing the brightness of reduced rate in low angular field of view of the brightness in high angular field of view becomes big, so improve the effect of wide viewing angleization more, can further relax the visual angle interdependence under the wide viewing angle control model.
Liquid crystal indicator of the present invention, it is characterized in that, possess: image correction unit, its setting contains first gray areas of a plurality of gray-scale values, with contain second gray areas that is in a ratio of a plurality of gray-scale values of high gray scale with the contained gray-scale value of described first gray areas, belong at gray-scale value under the situation of described first gray areas based on view data, described view data is carried out first gamma correction, belong under the situation of described second gray areas at gray-scale value based on the view data of importing, described view data is not carried out gamma correction, perhaps described view data is carried out second gamma correction of correcting value less than the correcting value of described first gamma correction; And image-display units, it is based on the output valve display image of described image correction unit.
In addition, it is characterized in that, also possess: represent the gray-scale value determining unit, it is obtained as a described gray-scale value of representing based on a plurality of view data; Wherein, described image correction unit, belong under the situation of described first gray areas at a described gray-scale value, a plurality of view data of importing described a plurality of pixels are carried out described first gamma correction, belong under the situation of described second gray areas at a described gray-scale value, a plurality of view data of importing described a plurality of pixels are not carried out gamma correction, perhaps described a plurality of view data are carried out second gamma correction of correcting value less than the correcting value of described first gamma correction.
And then, it is characterized in that also possessing: lighting device, it throws light on to described liquid crystal panel; And illumination briliancy adjustment unit, it can select second state of light of second briliancy of first state of light of described lighting device outgoing first briliancy and the light that the outgoing briliancy is lower than described first briliancy; Wherein, described image correction unit when described lighting device is in described second state, carries out described first or described second gamma correction.
In addition, other liquid crystal indicator of the present invention, it possesses: possess and show liquid crystal panel that the pixel with the corresponding image of gray-scale value forms and the lighting device that described liquid crystal panel is thrown light on, it is characterized in that, possess: illumination briliancy adjustment unit, it can select second state of light of second briliancy of first state of light of described lighting device outgoing first briliancy and the light that the outgoing briliancy is lower than described first briliancy; And image correction unit, when it is in described first state at described lighting device, described view data is reduced the correction of the brightness of described image.
Electronic equipment of the present invention is equipped with above-mentioned any display device of being put down in writing.As this electronic equipment, preferred, the picture monitor of the wide viewing angle characteristic that aspire for stability, TV developing device, especially require the navigational system of the vehicle mounted in the wide visual field, the picture monitor of TV developing device.
Description of drawings
Fig. 1 is the integrally-built summary exploded perspective view of liquid crystal indicator of the display part of the expression display device that constitutes embodiment.
Fig. 2 is the summary longitudinal section of this liquid crystal indicator.
Fig. 3 is and the relevant diagrammatic illustration figure that forms by the shown display image of this liquid crystal indicator.
Fig. 4 is the figure of the light outgoing characteristic of expression liquid crystal panel.
Fig. 5 is the summary construction diagram of the one-piece construction example of expression display device.
Fig. 6 is the detailed structure view of the inner structure of presentation video processing unit.
Fig. 7 is the figure of gray scale interdependence of the light outgoing characteristic of expression liquid crystal panel.
Fig. 8 be between the adjacent gray areas of light outgoing characteristic of expression liquid crystal panel transmissivity than and the chart of gray scale difference.
Fig. 9 is the key diagram of embodiment 1.
Figure 10 is the key diagram of embodiment 2.
Figure 11 is the key diagram of embodiment 3.
Figure 12 is the key diagram of embodiment 4.
Figure 13 is that the figure (a) that distributes of the briliancy before and after the correction of expression embodiment 1 to 4 is to (d).
Figure 14 is the approximate three-dimensional map of an example of the electronic equipment of the expression display device that is equipped with embodiment.
Symbol description
10: display device 11: input interface circuit 12:CPU 13:ROM
14:RAM 15:HDD 16: graphics processing unit 17: external memory unit
18: display interface circuit 19: power interface circuit 20; Power supply unit 21: power supply
100: liquid crystal indicator 110: liquid crystal panel 140: lighting unit
Embodiment
Next, with reference to Figure of description embodiments of the present invention are described.Fig. 1 is the summary exploded perspective view of liquid crystal indicator 100 of the display part of the expression liquid crystal indicator that constitutes present embodiment, and Fig. 2 is the summary longitudinal section of liquid crystal indicator 100.The liquid crystal indicator 100 of present embodiment comprises liquid crystal panel 110.Liquid crystal panel 110, by the transparency carrier 111 and the substrate 112 that do not have adhesions such as illustrated seal member to be made of glass etc., being sealed with does not therebetween have illustrated liquid crystal in (TN liquid crystal).Adhering respectively in the outside of substrate 111 and substrate 112 has polarization plates 115,116/
In addition, on substrate 111, be provided with than the profile of substrate 112 and stretch out the substrate extension 111T that forms laterally, on this substrate extension 111T, be formed with a plurality of wirings 117 of drawing in the overlapping sealing liquid crystal zone of substrate 111 and substrate 112 and near a plurality of inputs wirings 119 that the ora terminalis of substrate extension 111T, form.On substrate extension 111T, semi-conductor chip 118 that is connected with above-mentioned wiring 117 and input wiring 119 conductions, constitute liquid crystal drive control (driver) circuit and the circuit board 120 that is connected with input wiring 119 conductions are installed.
In addition, in above-mentioned liquid crystal panel 110, in the sealing liquid crystal zone of stromatolithic structure with polarization plates 115, substrate 111, liquid crystal, substrate 112 and polarization plates 116, be provided with the viewing area, this viewing area is arranged with a plurality of pixels that are used for the electrode of liquid crystal applied voltages that have on the inner face of substrate 111,112.Particularly, on the inner face of substrate 111, to each above-mentioned pixel, constitute the pixel electrode that is connected with the active component of TFT (thin film transistor (TFT)) etc. by the transparent conductive material of ITO (indium tin oxide) etc., in addition, on the inner face of substrate 112, counter electrode (common electrode) is made of identical transparent conductive material, and forms the chromatic color filter that comprises the painted color filter (filter) of RGB etc. with the regulation spread geometry.
Inside keeping frame 130 is provided with visual identity side stage jump face 132, is maintained fixed the outer edge of above-mentioned liquid crystal panel 110 on visual identity side stage jump face 132 by double-sided adhesive tape etc.
In the rear side of above-mentioned such liquid crystal panel that disposes 110, constitute lighting unit 140.This lighting unit 140 comprises above-mentioned light source 141.In addition, on the rear side step difference face 133 that is formed at the inside that keeps frame 130, be maintained fixed reflector plate 143.In addition, on reflector plate 143, dispose light guide plate 142, the light-emitting face 142b that has the light entrance face 142a that constitutes by the section relative and constitute by the surface of liquid crystal panel 110 sides with above-mentioned light source 141.In addition, on the light-emitting face 142b of light guide plate 142, configuration light diffusing sheet, light-collecting piece optical sheets 144 such as (prismatic lenses).
Fig. 3 is the key diagram of schematic configuration that is used to illustrate the optical system of present embodiment.Lighting unit 140 constitutes the light that penetrates from above-mentioned light source 141 and is incident in the light guide plate 142 from light entrance face 142a, from the light-emitting face 142b flat light source of outgoing equably roughly.From the illumination light of the illumination briliancy α of lighting unit 140 outgoing liquid crystal panel 110 is thrown light on, (x, each pixel outgoing y) is to observing side for the light exitance β that has by liquid crystal panel 110.
Here, light exitance β is light transmission when the such transmissive type liquid crystal panel of the liquid crystal panel 110 of present embodiment, but for example is being made of front light-source lighting unit, when using reflective liquid crystal panel as liquid crystal panel, is being equivalent to light reflectivity.In addition, light exitance β is the amount that each pixel in the viewing area of liquid crystal panel 110 is controlled, above-mentioned, and (x y) determines ad-hoc location and even position coordinates in the viewing area.
Constitute the image of regulation by the light that penetrates from liquid crystal panel 110.Constitute the pixel briliancy γ of this figure, exist with ... specific pixel and even position coordinates in the above-mentioned viewing area, and to exist with ... normal direction with display surface be that the angle of benchmark is a view angle theta.Usually, be to obtain the maximal value of pixel briliancy γ on 0 degree of visual angle in above-mentioned normal direction, along with the big pixel briliancy of the change γ reduction of view angle theta.
Fig. 4 represents that by the gray-scale value of the regulation in 8 gray areas the light exitance β of the liquid crystal panel 110 of present embodiment is the figure of the relation (viewing angle characteristic) of light transmission and view angle theta.Here, 8 gray areas R0～R7 are the gray areas of dividing 256 gray scales 0～255 of liquid crystal panel 110 by 32 gray areas, and the gray-scale value of above-mentioned figure is represented the light exitance on the interior a certain regulation gray scale L0 in each zone, L36, L73, L109, L146, L182, L219, the L255 (gray-scale value is 0,36,73,109,146,182,219,255 gray scale).
By this figure as can be known, in view angle theta is the scope (low angular field of view L θ) of 0～20 degree, the difference of light exitance β between the on the whole adjacent gray scale is relatively large, in view angle theta was the scope (high angular field of view H θ) of 35～60 degree, the difference of the light exitance β between the adjacent gray scale was less relatively.Especially as can be known, the difference of the light exitance β between the adjacent gray scale of high gray scale side in low angular field of view L θ is very big, and the difference of the light exitance β between the adjacent gray scale of high gray scale side in high angular field of view H θ is minimum.That is, the light exitance β of liquid crystal panel, in each pixel, compare low gray scale side produce between low angular field of view L θ and high angular field of view H θ in high gray scale side bigger poor.
Fig. 5 is the schematic block diagram of hardware configuration of display control program of the display device 10 of the expression above-mentioned liquid crystal indicator 100 that comprises present embodiment.In display device 10, be provided with: suitable with above-mentioned control module, as to be used to the corresponding image input signal S1 of view data that imports and import input interface circuit 11; With the shared CPU (central processing unit) that is connected of this input interface circuit 11 and internal bus (hereinafter referred to as CPU) 12; The internal storage unit of ROM 13, RAM 14, HDD 15 etc.; Graphics processing unit 16; And the external memory unit of reading and writing at the external memory media of CD or DVD etc. 17.In addition, will describe in detail later, can similarly construct this graphics processing unit 16, perhaps also can realize by the software configuration of carrying out by above-mentioned CPU12 with other inscape by the hardware configuration of logical circuit etc. about above-mentioned graphics processing unit 16.
In addition, above-mentioned internal bus is connected in above-mentioned liquid crystal indicator 100 via display interface circuit 18, via display interface circuit 18 image display signal S2 is supplied to liquid crystal panel 110 (above-mentioned semi-conductor chip 118).In addition, above-mentioned internal bus links to each other with the power supply unit 20 that is connected in power supply 21 via power interface circuit 19.This power supply unit 20, liquid crystal panel 110, lighting unit 140 to liquid crystal indicator 100 are supplied with required current potential, especially constitute the output of illumination briliancy adjustment unit, this illumination briliancy adjustment unit is regulated the illumination briliancy of lighting unit 140 based on the power control signal that gives via internal bus.
Fig. 6 is the inner structure of the graphics processing unit 16 shown in Figure 5 of expression more in detail or the details drawing of software configuration.Graphics processing unit 16 is the parts that constitute above-mentioned image correction unit, comprising: two field picture obtaining section 161; Look transformation component 162; Frame memory 163; Level (level) correction unit 164; Gamma correction portion 165; Image display signal generating unit 166; Correction coefficient maintaining part 167; Dimming ratio configuration part 168; Mode selection part 169; And fader control portion 170.
Here, level correction portion 164 has: histogram (histogram) makes portion 1641, level correction parameter generating unit 1642 and level correction execution portion 1643.In addition, gamma correction portion 165 has: briliancy summation Ys calculation portion 1651, average luminance Ym calculation portion 1652, coefficient summation Fs calculation portion 1653, briliancy summation Xs calculation portion 1654, average luminance Xm calculation portion 1655, correcting value calculation portion 1656, limit correcting value calculation portion 1657, correction of a final proof amount determination portion 1658 and brightness execution portion 1659.
Two field picture obtaining section 161 carries out obtaining in turn from the view data via input interface circuit 11 input the processing of data of each two field picture of motion video.Look transformation component 162 carries out the view data that two field picture obtaining section 161 obtains is transformed to the processing of briliancy data and chromatism data.Briliancy data and chromatism data after the conversion are stored in the frame memory 163.In addition, in this case, also can be transformed to each gray scale of expression (gray-scale value of briliancy L0～L255) under 8 situation for example by RGB.Here, in the following description, under any circumstance, describe, but also can handle the briliancy data of each RGB as handling above-mentioned briliancy data conditions.In addition, the briliancy of the briliancy data before the correction that obtains is here represented with X.
And level correction execution portion 1643 based on the above-mentioned briliancy data of above-mentioned parameter conversion, carries out level correction.Particularly, will be transformed to different tonal ranges, the adjustment of degree of comparing by the tonal range of higher limit and the briliancy data shown in the lower limit.The above-mentioned tonal range of briliancy data can be expanded to the whole tonal range (being 256 gray scales) of liquid crystal panel under 8 situation.The mode of these level correction is not particularly limited, but under the situation of present embodiment, also can not carry out level correction itself.In addition, the briliancy after the level correction of the briliancy X before the above-mentioned correction is represented by Y.
Dimming ratio τ is set as the parameter that is used to make the increase and decrease of lighting unit 140 issued light amounts in dimming ratio configuration part 168.This dimming ratio τ is the numerical value of the actual briliancy of expression lighting unit 140 with respect to the ratio of the standard briliancy of lighting unit 140, obtains above-mentioned standard briliancy when dimming ratio τ is " 1 ".In the present embodiment, dimming ratio τ is corresponding with the setting pattern of mode selection part 169 selections.Particularly, under above-mentioned power-saving control pattern, in order to reduce power consumption, dimming ratio τ is made as value less than " 1 ", the illumination briliancy of lighting unit 140 is reduced.On the other hand, under above-mentioned wide viewing angle control model, in order to obtain the wide viewing angle characteristic of image, dimming ratio τ is made as value greater than " 1 ", to improve the illumination briliancy of lighting unit 140.
Image display signal generating unit 166, synchronous with the timing of fader control portion 170 control lighting units 140, the image display signal S2 that generates accordingly with the view data of proofreading and correct sends to liquid crystal panel 110 the most at last.
Z(Y)＝F(Y)×G1+Y ...(1)
In above-mentioned (1) formula, Z is the briliancy after proofreading and correct, and G1 is the N Reference Alignment amount in the regulation briliancy.The correction coefficient of the worth ratio of proofreading and correct is somebody's turn to do in F (Y) expression in each briliancy Y as benchmark with N Reference Alignment amount G1.Therefore, be F (Y) * G1 perhaps with respect to the correcting value of the reality of briliancy Y.
Under the situation that whole briliancy Y is proofreaied and correct without exception, F (Y)=1, but by setting F (Y) accordingly as suitable function, thereby can prevent the deterioration of the contrast of the briliancy data behind the gamma correction with light outgoing characteristic at the gray-scale value of liquid crystal panel 110.
In addition, N Reference Alignment amount G1, because of the pattern of above-mentioned power-saving control pattern, wide viewing angle control model etc. is different, for example N Reference Alignment amount G1 is for just under the power-saving control pattern, and N Reference Alignment amount G1 is for bearing under the wide viewing angle pattern.N Reference Alignment amount G1 is determining above-mentioned F (Y) afterwards, the mean value Zm of the briliancy Z after the average luminance Xm of the briliancy X before for example proofreading and correct equals to proofread and correct and the product of above-mentioned dimming ratio τ, promptly definite by the condition shown in the following formula (2).
τ×Zm＝Xm ...(2)
These processing can be obtained by following mode.Promptly, summation Xs, its average luminance Xm of the summation Ys of briliancy Y after the level correction that utilization is tried to achieve in above-mentioned briliancy summation Ys calculation portion 1651, average luminance Ym calculation portion 1652, coefficient summation Fs calculation portion 1653, briliancy summation Xs calculation portion 1654, average luminance Xm calculation portion 1655, the summation Fs of its average luminance Ym, correction coefficient F, the briliancy X before proofreading and correct, for example utilize above-mentioned formula (2), obtain N Reference Alignment amount G1 by following formula (3).
G1＝(N×Zm-Ys)/Fs
＝N(Xm-τ×Ym)/(τ×Fs)＝-N×Δs/(τ×Fs)...(3)
Here, N is the quantity of the gray areas of briliancy Y existence, Δ s=τ * Ym-Xm.
Above-mentioned calculation is carried out by correcting value calculation portion 1656, if but unrestrictedly increase and decrease dimming ratio τ, the contrast in then high sometimes briliancy zone or low briliancy zone can reduce.So, by to dimming ratio τ added limitations, suppress the reduction of contrast, so the calculation processing that puts rules into practice, contrast can not be lower than setting and set followingly, then can obtain limit dimming ratio τ ' and limit correcting value G1 ', this is carried out by limit correcting value calculation portion 1657.And then, determine by correction of a final proof amount determination portion 1658, final dimming ratio T " be above-mentioned dimming ratio τ and the medium and small side of limit dimming ratio τ '; correction of a final proof amount G1 " be the medium and small side of said reference correcting value G1 and limit correcting value G1 ', based on these final dimming ratio τ " and correction of a final proof amount G1 ", by the gamma correction of gamma correction execution portion 1659 final carries out image data.
Fig. 7 represents that the light exitance (light transmission) of the gray scale L0～L255 in gray areas R0～R7 in each pixel of above-mentioned liquid crystal panel 110 and the illumination briliancy of lighting unit 140 are 5000cd/m
2The time the image briliancy.Light exitance between adjacent briliancy zone when in addition, Fig. 8 represents that visual angle 0 degree and 60 is spent or image briliancy poor.These tendencies and represented the same of above-mentioned Fig. 4.
In the present embodiment, in high angular field of view H θ (particularly view angle theta=60 degree) with gray areas or should the zone in the gray-scale value of regulation as benchmark gray areas (benchmark briliancy region R 4 or benchmark gray-scale value L146), this gray areas with the difference of the light exitance between the adjacent gray areas be 0.2% or adjacent gray areas between the difference 10cd/m of gray scale
2Be up-and-down boundary, to be made as high gray areas than the high gray areas R5～R7 of this benchmark gray areas R4, the gray-scale value that will be higher than benchmark gray-scale value L146 is made as high gray-scale value, in addition, to be made as low gray areas than the low gray areas R0～R3 of this benchmark gray areas R4, the gray-scale value that will be lower than benchmark gray-scale value L146 is made as low gray-scale value.At this moment, as can be known, in high angular field of view H θ, the difference less relatively (mean value of the difference of light exitance is less relatively) of the light exitance in high gray areas or high gray-scale value (the high gray areas in high visual angle) between the adjacent gray scale, the difference relatively large (mean value of the difference of light exitance is relatively large) of the light exitance in low gray areas or low gray-scale value (gray areas is hanged down at high visual angle) between the adjacent gray scale.That is, in high angular field of view H θ, the difference of the light exitance between the adjacent gray scale of high gray scale side diminishes.
On the other hand, in low angular field of view L θ, the difference of the light exitance in above-mentioned high gray areas or high gray-scale value (the high gray areas in low visual angle) between the adjacent gray scale is relatively large, and the difference of the light exitance in low gray areas or low gray-scale value (the low gray areas in low visual angle) between the adjacent gray scale is less relatively.That is, in low angular field of view L θ, and high angular field of view H θ on the contrary the difference of the light exitance between the adjacent gray scale of high gray scale side become big.
The benchmark gray areas is benchmark gray areas R4 and benchmark gray-scale value L146, can be made as and satisfy relation as described above (in high angular field of view, the mean value of the difference of the light exitance between the adjacent gray scale of the high gray areas in high visual angle of the high gray scale side higher than benchmark gray-scale value is less than the relation of the mean value of the difference of the light exitance between the adjacent gray scale of the low gray areas in the high visual angle of the low gray scale side lower than benchmark gray-scale value) zone and even value.Here, preferably, will be as the benchmark gray areas or the benchmark gray-scale value of benchmark gray areas, be set in 45%～65% the scope of full grey (promptly, under the situation of 8 gray scales in the scope of gray areas R3, benchmark gray areas R4, gray areas R5, gray-scale value is in the scope of L114～L166), especially preferred, be set in 50%～60% the scope of full grey (that is, in benchmark gray areas R4, the scope of gray-scale value under the situation of 8 gray scales) at L127～L154.As long as benchmark gray areas or benchmark gray-scale value are in these scopes, usually the difference of the light exitance between the adjacent gray scale changes on the liquid crystal panel of TN pattern, in the front and back of this benchmark gray areas or benchmark gray-scale value, the difference of the light exitance between the adjacent gray scale changes significantly.
In liquid crystal panel with smooth outgoing characteristic as described above, the gamma correction of carries out image data carries out high gray processing, the view data of supplying with after this correction drives liquid crystal panel 110, then contrast increases in low angular field of view L θ, on the other hand, contrast reduces in high angular field of view H θ, makes the illumination briliancy of lighting unit 140 further reduce the problem that narrow and smallization of viewing angle characteristic is such so exist.On the contrary, make view data hang down gray processing, drive liquid crystal panel in the case, then contrast reduces in low angular field of view L θ, and on the other hand, contrast increases in high angular field of view H θ, so that the illumination briliancy of lighting unit 140 further increases, then viewing angle characteristic becomes wide.Like this view data is being carried out under the situation of gamma correction, with the viewing angle characteristic variation of its correcting value respective image, so be difficult to stably obtain desired viewing angle characteristic.
So, in the present embodiment, be the border with above-mentioned benchmark gray areas R4 or benchmark gray-scale value L146, change correcting value of above-mentioned gamma correction or having or not of gamma correction down thereon.
Fig. 9 is the key diagram of embodiment 1 of an example of the correcting mode of the gamma correction under the expression power-saving control pattern.Under this power-saving control pattern, the gray scale that improves briliancy X becomes briliancy Z, according to its correcting value, establishes dimming ratio τ less than " 1 ", and the illumination briliancy of lighting unit 140 is reduced.At this moment, in embodiment 1, when the briliancy X before the correction of view data for example is distributed in the scope of gray areas R0～R1, do not carry out above-mentioned level correction, by gamma correction, make briliancy Z after the correction be distributed to the scope of benchmark gray areas R4 from gray areas R2, R3.Under these circumstances, the tonal range of briliancy Z after keeping proofreading and correct is less than benchmark gray areas R4 or benchmark gray-scale value L146, can make simultaneously from briliancy X is the amount of two gray areas to the correcting value increase of the gamma correction of briliancy Z, reduces above-mentioned dimming ratio τ according to its correcting value.Under these circumstances, because the correcting value of gamma correction acquires a certain degree, but the variation of gray-scale value does not surpass benchmark gray areas R4 or benchmark gray-scale value L146, so the change of the ratio of the briliancy of above-mentioned low angular field of view L θ and high angular field of view H θ is less, suppress the change of viewing angle characteristic.
In addition, briliancy X before proofreading and correct is distributed to from benchmark gray areas R4 greater than in the scope of the benchmark tonal range R5 of benchmark gray areas R4 or benchmark gray-scale value L146 the time, do not carry out above-mentioned level correction, proofread and correct by gamma correction, make that the briliancy Z after proofreading and correct is distributed in the scope of gray areas R5～R6.In this case, the tonal range of the briliancy Z after the correction so reduced the correcting value to the gamma correction of briliancy Z from briliancy X, makes it to become the amount of a gray areas on benchmark gray areas R4 or benchmark gray-scale value L146.Thus, the reduced rate of above-mentioned dimming ratio τ descends, but the variable quantity of briliancy is less, so the change of the ratio of the briliancy of above-mentioned low angular field of view L θ and high angular field of view H θ is less, suppresses the change of viewing angle characteristic.
And, when the briliancy X before correction is distributed in the scope of benchmark gray areas R4 from gray areas R3, proofread and correct, make that the briliancy Z after proofreading and correct is distributed in the scope of benchmark tonal range R5 from benchmark gray areas R4.In this case, when the correcting value of gamma correction is the amount of two gray areas, gray-scale value after the correction is greater than said reference gray areas R4 or benchmark gray-scale value L146, so it is identical with the situation briliancy X before the above-mentioned correction is distributed to the scope of tonal range R5 from benchmark gray areas R4 in, the correcting value of gamma correction reduces, and suppresses the change of viewing angle characteristic.In addition, under the situation of illustrated example, even if be reduced at the correcting value of gamma correction under the situation of amount of a gray areas, also greater than said reference gray areas R4 or benchmark gray-scale value L146.
By as this embodiment 1, controlling the mode of gamma correction, can suppress the change of the viewing angle characteristic under the battery saving mode, can both guarantee the power saving effect stable display quality of getting back.In above-mentioned example, the correcting value of gamma correction reduces in the high gray scale side that with benchmark gray areas or benchmark gray-scale value is benchmark, but for example under situation such as the correcting value of the standard of power-saving control pattern is less, can not carry out gamma correction fully in high gray scale side yet.
In addition, in the above-described embodiment, aspect explanation, situation to the scope of the briliancy before and after limit proofreading and correct is illustrated, but in general in most cases luminance range is not limited in the very little scope as described above, therefore, can use the representative tonal range more than assigned frequency on the histogram to replace above-mentioned scope, perhaps use the typical value (mean value of the briliancy X of the view data before proofreading and correct, median etc.) and the typical value (mean value of the gray scale Z of the graph data after proofreading and correct, median etc.) replace above-mentioned scope etc., suitably set and represent tonal range, typical value, can represent tonal range according to this, the relation of typical value and said reference tonal range or benchmark gray-scale value, the mode of transformation luminance correction.
In addition, even if the intensity profile of briliancy data is dispersed under the situation in the whole tonal range in the view data of input, same with the explanation of the foregoing description 1, correcting value to the briliancy data in the specific tonal range before the correction that is in gamma correction, compare with said reference gray areas or benchmark gray-scale value when being in high gray-scale value side in this specific tonal range, be lowered or eliminate.In this case, the correcting value of briliancy data is changed one by one according to original gray-scale value, get final product but its dimming ratio τ is the value corresponding with original gamma correction amount.In addition, even if in this case, when not only the briliancy X of the specific tonal range before correction is more than or equal to said reference gray areas R4 or benchmark gray-scale value L146, and the briliancy X of the specific tonal range before correction is less than said reference gray areas or benchmark gray-scale value but the briliancy Z after proofreading and correct during greater than said reference gray areas or benchmark gray-scale value, can similarly reduce or eliminates correcting value with above-mentioned.
Figure 10 be expression with the correction of the embodiment 2 of other examples of the correcting mode of the gamma correction of above-mentioned same power-saving control pattern before and after the key diagram of distribution range of briliancy X, Z.In this embodiment 2, the distribution range of the briliancy X before correction is under the situation of gray areas R0～R1, proofreaies and correct, and makes the distribution range of the briliancy Z after proofreading and correct become gray areas R1～R3.That is, briliancy X originally distributes and spreads all over these two gray areas of gray areas R0～R1, but the distribution of the briliancy Z after proofreading and correct spreads all over these three gray areas of gray areas R1～R3.The expansion of such distribution range can easily realize by above-mentioned level correction.According to this correcting mode, briliancy Z is distributed in the bigger scope before comparing correction, thus not only increase briliancy, and also can improve contrast as a whole.
On the other hand, even if in this embodiment 2, under the situation of briliancy X before correction more than or equal to said reference gray areas R4 or benchmark gray-scale value L146, or the briliancy X before correction is less than said reference gray areas or benchmark gray-scale value but under the situation of briliancy Z greater than said reference gray areas or benchmark gray-scale value after proofreading and correct, and can not become wide with the distribution range that embodiment similarly reduces correcting value and briliancy.Even if in this embodiment 2, similarly to Example 1, can not only seek province's electrification but also suppress the change of viewing angle characteristic.
Figure 11 is the key diagram of embodiment 3 of example of the correcting mode of the gamma correction under the expression wide viewing angle control model.Under the wide viewing angle control model, the gamma correction that reduces by the gray scale that makes briliancy X is made as briliancy Z with briliancy, sets dimming ratio τ greater than 1 according to its correcting value, thereby view data self is reduced, replace, reduce the luminance difference of low angular field of view L θ and high angular field of view H θ.In this embodiment 3, no matter whether greater than said reference gray areas R4 or benchmark gray-scale value L146, the gray scale of briliancy X before proofreading and correct is reduced without exception, thereby eliminate the big high gray-scale value of difference of the light exitance of low angular field of view L θ and high angular field of view H θ, mainly make the little low gray areas of difference, so obtain the wide viewing angle characteristic with the light exitance.
Figure 12 is the key diagram of embodiment 4 of other examples of the correcting mode of the gamma correction under the expression wide viewing angle control model.This embodiment 4 similarly to Example 3, the gray scale of briliancy is lowered, but in the present embodiment, the distribution range of briliancy X before correction is tonal range R6-R7, under any one the situation from benchmark tonal range R4 to luminance range R5, from gray areas R3 to benchmark gray areas R4, the distribution range of the briliancy Z after the correction enlarges.Under the situation of illustrated example, the amplification degree of distribution range is about 1.5 times～2.0 times.The expansion of this distribution range can easily realize by carrying out above-mentioned level correction.Under the situation of present embodiment, the gray scale that makes briliancy X reduces and obtains briliancy Z, so about the light outgoing characteristic of above-mentioned liquid crystal panel, the possibility that distribution range equates and contrast reduces is higher.But, by carrying out the expansion of distribution range in the present embodiment, in further wide viewing angleization, also can seek keeping, improving of the contrast in low angular field of view L θ especially.
Figure 13 is the figure of the histogrammic variation of the correction front and back in the expression the various embodiments described above.Figure 13 (a) is illustrated in the state of the correction of the tonal range of carrying out the whole distribution that improves the briliancy X before proofreading and correct among the embodiment 1.In such cases, before and after proofreading and correct, keep the distribution shape of histogram self,, make gray-scale value only change the amount of N Reference Alignment amount G1 to high gray scale side so correction coefficient F (Y) is fixed as " 1 ".
Figure 13 (b) is illustrated in and carries out the not only whole state that improves the tonal range of the distribution of proofreading and correct preceding briliancy X but also enlarge the correction of distribution range among the embodiment 2.In this case, the distribution shape of histogram self becomes mild and overall intensity distributes and moves to high gray scale lateral deviation.So, after carrying out the level correction value that enlarges distribution range in advance, correction coefficient F (Y) is fixed as " 1 ", makes gray-scale value only change the amount of N Reference Alignment amount G1 to high gray scale side.Enlarge distribution range like this, especially under the situation of in the tonal range that is lower than said reference gray areas or benchmark gray-scale value, proofreading and correct, have and to access the such advantage of enough contrasts.
Figure 13 (c) is illustrated in the state of the whole correction that reduces of distribution range that makes the briliancy X before proofreading and correct among the embodiment 3.Under these circumstances, before and after proofreading and correct, keep the distribution shape of histogram self,, make gray-scale value only change the amount of N Reference Alignment amount G1 (negative) to low gray scale side so correction coefficient F (Y) is fixed as " 1 ".
Figure 13 (d) is illustrated in the whole state that reduces but also enlarge the correction of distribution range of tonal range of the distribution that not only makes the briliancy X before proofreading and correct among the embodiment 4.In such cases, the distribution shape of histogram self becomes mild and overall intensity distributes and moves to low gray scale lateral deviation.So, after carrying out the level correction value that enlarges distribution range in advance, correction coefficient F (Y) is fixed as " 1 ", makes gray-scale value only change the amount of N Reference Alignment amount G1 (negative) to low gray scale side.Enlarge distribution range like this, especially in the tonal range that is lower than said reference gray areas or benchmark gray-scale value, reduce under the situation of correction, also have the advantage that to guarantee that enough contrasts are such.
As the application examples of the control method of above-mentioned explanation, the visual angle of the demonstration of the liquid crystal indicator that can schematically narrow.That is,, carry out view data and proofread and correct, make that the view data after proofreading and correct is converted to the high gray scale side that is higher than the benchmark gray areas the low gray scale side that is lower than the benchmark tonal range or the view data of benchmark tonal range.Then, for the view data of the high gray scale side that is higher than the benchmark tonal range, make to show bright correction.By controlling like this, can access the bigger bright image of visual angle interdependence of display image.Especially, if carry out such control when the power-saving control pattern that the briliancy that makes lighting unit reduces, then the brightness of image does not descend too much, only from top view the time, can access the useful image of contrast-response characteristic.
Figure 14 is the approximate three-dimensional map of example of the electronic equipment of the expression display device 1 of carrying present embodiment.The electronic equipment 200 of illustrated example is the auto-navigation system of vehicle mounted, and it possesses body 210 and the display part 220 that is connected with this body 210.On body 210, be provided with the operating surface 211 that is equipped with action button etc., and be provided with the introducing port 212 of the medium of DVD etc.Constituting, take in above-mentioned liquid crystal indicator 100 in the inside of display part 220, the display frame of the above-mentioned viewing area of this liquid crystal indicator 100, is the demonstration of navigation picture, can be by the display frame 220a visual identity of display part 220.
In the electronic equipment 200 of the monitor that comprises vehicle mounted as described above, with wider angular field of view visual identity display part 220, so the change of viewing angle characteristic is big to the influence of display quality, and the also demand visual angle wider than normal conditions sometimes.Therefore, use above-mentioned display device 10, can constitute electronic equipment with stable display quality.
Claims (10)
1. the control method of a liquid crystal indicator, this liquid crystal indicator has liquid crystal panel, and this liquid crystal panel possesses the pixel that shows with the corresponding image of gray-scale value and forms, and this control method comprises:
Setting contains first gray areas of a plurality of gray-scale values and contains second gray areas that is in a ratio of a plurality of gray-scale values of high gray scale with the contained gray-scale value of described first gray areas;
Belong at gray-scale value under the situation of described first gray areas, described view data is improved first gamma correction of the brightness of described image based on view data; And
Belong at gray-scale value under the situation of described second gray areas, described view data is not carried out gamma correction, perhaps described view data is carried out second gamma correction of correcting value less than the correcting value of described first gamma correction based on view data.
2. the control method of the liquid crystal indicator of putting down in writing according to claim 1, wherein,
Possess a plurality of described pixels,
Based on a plurality of view data of the described a plurality of described pixels of input, determine a described gray-scale value as representative,
Belong under the situation of described first gray areas at a described gray-scale value, a plurality of view data of importing described a plurality of pixels are carried out described first gamma correction, belong under the situation of described second gray areas at a described gray-scale value, a plurality of pixel datas of importing described a plurality of pixels are not carried out gamma correction, perhaps described a plurality of pixel datas are carried out described second gamma correction of correcting value less than the correcting value of described first gamma correction.
3. the control method of the liquid crystal indicator of putting down in writing according to claim 1, wherein,
Described liquid crystal indicator also possesses the lighting device that described liquid crystal panel is thrown light on, described lighting device can be selected second state of light of second briliancy of first state of light of outgoing first briliancy and the light that the outgoing briliancy is lower than described first briliancy, when described second state, carry out described first or second gamma correction.
4. the control method of the liquid crystal indicator of putting down in writing according to claim 3, wherein,
When described first state, described view data is reduced the 3rd gamma correction of the brightness of described image.
5. the control method of a liquid crystal indicator, this liquid crystal indicator possesses: possess and show liquid crystal panel that the pixel with the corresponding image of gray-scale value forms and the lighting device that described liquid crystal panel is thrown light on, it is characterized in that:
Described lighting device can be selected second state of light of second briliancy of first state of light of outgoing first briliancy and the light that the outgoing briliancy is lower than described first briliancy, when described first state, described view data is reduced the 3rd gamma correction of the brightness of described image.
6. liquid crystal indicator is characterized in that possessing:
Image correction unit, its setting contains first gray areas of a plurality of gray-scale values, with contain second gray areas that is in a ratio of a plurality of gray-scale values of high gray scale with the contained gray-scale value of described first gray areas, belong at gray-scale value under the situation of described first gray areas based on view data, described view data is carried out first gamma correction, belong at gray-scale value under the situation of described second gray areas based on input image data, described view data is not carried out gamma correction, perhaps described view data is carried out second gamma correction of correcting value less than the correcting value of described first gamma correction; And
Image-display units, it is based on the output valve display image of described image correction unit.
7. the liquid crystal indicator of putting down in writing according to claim 6 is characterized in that, also possesses:
Represent the gray-scale value determining unit, it is obtained as a described gray-scale value of representing based on a plurality of view data;
Wherein, described image correction unit, belong under the situation of described first gray areas at a described gray-scale value, a plurality of view data of importing described a plurality of pixels are carried out described first gamma correction, belong under the situation of described second gray areas at a described gray-scale value, a plurality of view data of importing described a plurality of pixels are not carried out gamma correction, perhaps described a plurality of view data are carried out second gamma correction of correcting value less than the correcting value of described first gamma correction.
8. according to claim 6 or 7 liquid crystal indicators of being put down in writing, it is characterized in that also possessing:
Lighting device, it throws light on to described liquid crystal panel; And
Illumination briliancy adjustment unit, it can select second state of light of second briliancy of first state of light of described lighting device outgoing first briliancy and the light that the outgoing briliancy is lower than described first briliancy;
Wherein, described image correction unit when described lighting device is in described second state, carries out described first or described second gamma correction.
9. liquid crystal indicator, it possesses: possess and show liquid crystal panel that the pixel with the corresponding image of gray-scale value forms and the lighting device that described liquid crystal panel is thrown light on, it is characterized in that possessing:
Illumination briliancy adjustment unit, it can select second state of light of second briliancy of first state of light of described lighting device outgoing first briliancy and the light that the outgoing briliancy is lower than described first briliancy; And
Image correction unit when it is in described first state at described lighting device, reduces the correction of the brightness of described image to described view data.
10. electronic equipment is characterized in that possessing:
According to claim 6 each liquid crystal indicator of putting down in writing to the claim 9.
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| JP2008022426 | 2008-02-01 | ||
| JP022426/2008 | 2008-02-01 | ||
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013127093A1 (en) * | 2012-03-01 | 2013-09-06 | 深圳市华星光电技术有限公司 | Method and device for simulating oblique viewing angle image |
| CN106959807A (en) * | 2017-03-24 | 2017-07-18 | 北京小米移动软件有限公司 | View angle switch method and device |
| CN111727471A (en) * | 2018-02-23 | 2020-09-29 | 索尼半导体解决方案公司 | Display device, driving method of display device, and electronic apparatus |
| WO2021128459A1 (en) * | 2019-12-24 | 2021-07-01 | 惠州市华星光电技术有限公司 | Brightness viewing angle adjusting method, device and system for liquid crystal display panel, and display device |
-
2008
- 2008-12-11 CN CNA200810177287XA patent/CN101499250A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013127093A1 (en) * | 2012-03-01 | 2013-09-06 | 深圳市华星光电技术有限公司 | Method and device for simulating oblique viewing angle image |
| CN106959807A (en) * | 2017-03-24 | 2017-07-18 | 北京小米移动软件有限公司 | View angle switch method and device |
| CN111727471A (en) * | 2018-02-23 | 2020-09-29 | 索尼半导体解决方案公司 | Display device, driving method of display device, and electronic apparatus |
| WO2021128459A1 (en) * | 2019-12-24 | 2021-07-01 | 惠州市华星光电技术有限公司 | Brightness viewing angle adjusting method, device and system for liquid crystal display panel, and display device |
| US11538429B2 (en) | 2019-12-24 | 2022-12-27 | Huizhou China Star Optoelectronics Technology Co., Ltd. | Method, device, system, and display device for adjusting luminance viewing angle of liquid crystal display panel |
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