CN1842839A - Image display device and image display method - Google Patents
Image display device and image display method Download PDFInfo
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Abstract
An image display device and an image display method able to display a middle gray-scale by using a plurality of pixels or fields and, at the same time, improve viewing angle characteristics are provided. When displaying an image via a direct view type liquid crystal display screen, a gray-scales of an input video signal is converted to characteristic values (transmittances) of pixels two-dimensionally arranged with respect to the display image, and the gray-scale is converted so as to include, among a plurality of pixels or fields expressing a middle gray-scale, at least one pixel or field converted to a first characteristic value obtained by adding a positive correction value to the gray-scale of the input video signal, and at least one pixel or field converted to a second characteristic value obtained by adding a negative correction value to the gray-scale of the input video signal.
Description
Technical field
The present invention relates to for example in liquid crystal display, can carry out the image display and the method for displaying image of gray level display according to incoming video signal.
Background technology
When can be on display gray-scale displayed number of stages seldom the time, the border between the gray level shows as the isocontour pattern of similar map.This is called as " false contouring ", and has greatly reduced display performance.
Usually, if every kind of color can be by about 8 demonstrations (256 gray levels), then this false contouring becomes the level that can not cause problem in display performance.
Yet, in LCD, plasma display (PDP), electroluminescent display (ELD) or other display equipment, difficult to show every kind of color (256 gray levels) with 8.
For example, the liquid crystal display utilization that the thin film transistor (TFT) (TFT) that is used to drive liquid crystal is installed has and the characteristic that applies the liquid crystal material of signal voltage corresponding characteristic curve (for example transmittance curve), and with voltage division for to be complementary with the gray level rank, show to carry out intermediate grey scales thereby obtain predetermined characteristics value (for example transmitance).
Yet, when utilizing this mode to attempt to represent 8 gray levels (256 gray levels), the scope of dividing voltage becomes very narrow, and the variation owing to liquid crystal material characteristic and TFT characteristic causes the gray level rank overlapping in some cases, and can't fully show 256 gray levels.
In addition, in the dot matrix drive system of using stn liquid crystal, come color display, therefore, in dot element, can only carry out two-value basically and show by the liquid crystal in On/Off red (R), green (G) and blue (B) dot element.
Plasma display (PDP) also is the display device that utilizes dot matrix type display emission binary light, therefore, usually utilize sub-field method to show, the stack of this method a plurality of about time-weighted binary picture so that show moving image with intermediate grey scales.In this system, can generate false contouring according to driving form sometimes.
As the method that in this display device, shows the intermediate grey scales image, use the additive method of the pseudo-gray level of shake (dither), error diffusion and expression of a plurality of pixels to be used to intermediate grey scales demonstration (for example seeing patent documentation 1).
For example, form (256 gray levels) by 8 and the display performance of display device is in the situation of 6 (64 gray levels) at input signal, hang down 2 so that show 6 (64 gray levels) images if simply from 8 input signals (256 gray levels), abandon, then can produce the isocontour pattern of similar map.In order to make this pattern so unobvious, in shake, little noise deliberately is added on the input signal.
Shake in the expression commonly used through being commonly used in pseudo-gray level when illustrating below with reference to Figure 1A to 1D.
Here, Benq is in the shake of texture as example with using following situation, and wherein dither matrix is made up of n point and m bar line, and n and m are 2.As described below, in this case, 256 gray levels of 8 (0,1,2,3 ..., 255) can by 64 gray levels of 6 (0,4,8,12 ..., 252) pseudo-expression.
Suppose that input signal (8) becomes shown in Figure 1A.To this, 2 * 2 dither matrixs of the shake coefficient shown in Figure 1B and the counterpart addition of pixel.
Addition result is shown in Fig. 1 C.Because incoming video signal forms by 8, therefore hang down 2 and be dropped (making it to become 0), so that can show 6 display performance.Value when abandoning than low 2 is shown in Fig. 1 D.
For example, when in Fig. 1 C with shake coefficient addition after image data value when being " 211 ", it is expressed as " 11010011 " with binary mode, therefore, becomes " 11010000 " abandoning low 2 durations, is expressed as " 208 " in decimal system mode.
By carrying out this processing, 8 gray levels (256 gray levels) can be represented with 6 (64 gray levels) is pseudo-.
The following describes the principle of this shake.
No matter add which type of shake coefficient when being " 0 " when low 2 among initial 8 of incoming video signal, higher 6 can not increase.
Low 2 when being " 1 " when among initial 8 of incoming video signal, only the shake coefficient be in 3 the situation higher 6 just can advance 1.For example, the picture signal with value " 109 " represents it is " 01101101 " with binary mode.Higher 6 are advanced 1 when adding shake coefficient 3 (00000011).
In the dither matrix of Figure 1B, the shake coefficient is that 3 probability is 1/4, therefore, is being that higher 6 probability that advance 1 are 1/4 in the situation of " 1 " at low 2.
Low 2 when being " 2 " when among initial 8 of incoming video signal, the shake coefficient be in 3 or 2 the situation higher 6 advance 1.
In the dither matrix of Figure 1B, the shake coefficient is that 3 or 2 probability is 2/4, therefore, is being that higher 6 probability that advance 1 are 2/4 in the situation of " 2 " at low 2.
Low 2 when being " 3 " when among initial 8 of incoming video signal, the shake coefficient be in 3,2 or 1 the situation higher 6 advance 1.
In the dither matrix of Figure 1B, the shake coefficient is that 3,2 or 1 probability is 3/4, therefore, is being that higher 6 probability that advance 1 are 3/4 in the situation of " 3 " at low 2.
For example, in the time of on have original value 21 when above-mentioned shake the is applied to view data of (comparatively low 2 is 1), it is 1 pixel in per 4 pixels that value becomes 24 probability, and becoming 20 probability is 3 pixels in per 4 pixels.
Therefore, the average gray level of shake back image becomes 24 * 1/4+20 * 3/4=21, thereby original 8 can be come pseudo-the expression with 6 (in 8 low 2 is 0).As mentioned above, input image data is finally with the pseudo-expression of 6 gray level.
In this shake, observe the regular pattern that additive value has periodic characteristic and checkerboard in the horizontal direction with on the vertical direction sometimes.
For example, when all pixels are " 1 " in the input signal shown in Fig. 2 A, make low 2 to be " 0 " on the input signal then, then obtained the picture pattern as shown in Fig. 2 C if the execution processing is added to the shake coefficient with Fig. 2 B.In this pattern, show that the ratio of " 4 " is in per 4 pixels 1 pixel to be arranged, therefore, can puppet express " 1 " on average.
Yet, as shown in the figure, generated " 4 " regularly arranged fixed pattern, so this is considered to decrease in image quality.In order to prevent the generation of this fixed pattern, the dither technique for the different dither matrixs of each use has been proposed.
Patent documentation 1: Japanese patent application (A) No.2002-052758
Summary of the invention
The problem to be solved in the present invention:
In for example having the dependent direct viewing escope of viewing angle, phase differential (delay) in image, occurs according to view direction, thereby the color of the image that finally shows changes on display.
Therefore owing to this reason, even can utilize a plurality of pixels to realize that this effect also only just can show in the situation of demonstration of intermediate grey scales the situation of watching display from specific direction by above-mentioned shake.When any other direction is watched image, generally can not accurately demonstrating intermediate grey scales.
That is, in liquid crystal display commonly used etc., can realize that intermediate grey scales represents, but have the shortcoming that to improve the viewing angle characteristic.
The purpose of this invention is to provide and a kind ofly can utilize a plurality of pixels to carry out image display and method that intermediate grey scales shows and improve simultaneously the viewing angle characteristic.
Be used to solve device of the present invention:
A first aspect of the present invention is a kind of image display that can carry out gray level display according to incoming video signal, have: the grey level transition device, be used for the grey level transition of incoming video signal is the characteristic value with respect to the pixel of the image two-dimensional arrangements that will show, wherein said grey level transition device conversion gray level is so that comprise that in a plurality of pixels of expression intermediate grey scales at least one pixel that is converted into first characteristic value and at least one are converted into the pixel of second characteristic value, wherein first characteristic value is by obtaining on the gray level that the positive correction value is added to incoming video signal, and second characteristic value obtains by adding the negative correction value.
Preferably, this equipment also has corrected value device is set, and is used for according to the intermediate grey scales that should represent corrected value being set.
Preferably, this grey level transition device is changed the gray level of the vision signal of being shown by former colour brightness component list.
Preferably, this grey level transition device conversion gray level, thus make first characteristic value that adds positive correction value or negative correction value or any in second characteristic value become maximum characteristic value or minimum characteristics value.
A second aspect of the present invention is a kind of image display that can carry out gray level display according to incoming video signal, have: the gray level expressing device, be used to utilize the intermediate grey scales of representing incoming video signal by a plurality of the field row that form, wherein said gray level expressing device is represented gray level and is converted into the field of second characteristic value so that comprise at least one field that is converted into first characteristic value with at least one, wherein first characteristic value is by obtaining on the gray level that the positive correction value is added to incoming video signal, and second characteristic value obtains by adding the negative correction value.
Preferably, this equipment also has the device of setting, is used for according to the intermediate grey scales that should represent first characteristic value and second characteristic value being set.
Preferably, this gray level expressing device utilization field is listed as the intermediate grey scales of representing the vision signal shown by former colour brightness component list.
Preferably, thus this gray level expressing device represent gray level and make in first characteristic value and second characteristic value any become maximum characteristic value or minimum characteristics value.
A third aspect of the present invention is a kind of image display that can carry out gray level display according to incoming video signal, have: the grey level transition device is used for the grey level transition of incoming video signal is the characteristic value with respect to the pixel of the image two-dimensional arrangements that will show; With the gray level expressing device, be used to utilize the intermediate grey scales of representing incoming video signal by a plurality of the field row that form, wherein said grey level transition device conversion gray level is so that comprise that in a plurality of pixels of expression intermediate grey scales at least one pixel that is converted into first characteristic value and at least one are converted into the pixel of second characteristic value, wherein first characteristic value is by obtaining on the gray level that the positive correction value is added to incoming video signal, second characteristic value obtains by adding the negative correction value, and described gray level expressing device is represented gray level and is converted into the field of second characteristic value so that comprise at least one field that is converted into first characteristic value with at least one, wherein first characteristic value is by obtaining on the gray level that the positive correction value is added to incoming video signal, and second characteristic value obtains by adding the negative correction value.
Preferably, this equipment also has controller, be used for when incoming video signal comprises moving image, controlling described grey level transition device and change gray level, and when incoming video signal is formed by rest image, control described gray level expressing device utilization field and be listed as and represent intermediate grey scales.
A fourth aspect of the present invention is that a kind of can the utilization by a plurality of the fields that form is listed as the image display of representing the intermediate grey scales of incoming video signal and carrying out gray level display according to incoming video signal, have: the display that comprises liquid crystal pixel cells, described liquid crystal pixel cells utilization comes display image according to the gray level of driving voltage, and be used to generate drive part corresponding to the driving voltage of effective voltage, described effective voltage comprises that wherein said second voltage is set to be lower than the threshold voltage according of liquid crystal cells corresponding to first voltage of bright level with corresponding to second voltage of black level.
A fifth aspect of the present invention is that a kind of can the utilization by a plurality of the fields that form is listed as the image display of representing the intermediate grey scales of incoming video signal and carrying out gray level display according to incoming video signal, have: the display that comprises liquid crystal pixel cells, described liquid crystal pixel cells utilization comes display image according to the gray level of driving voltage, and be used to generate drive part corresponding to the driving voltage of effective voltage, described effective voltage comprises corresponding to first voltage of bright level with corresponding to second voltage of black level, wherein said first voltage is set to be higher than the voltage of following specific voltage, at this specific voltage place, the characteristic value of liquid crystal cells begins to become maximum substantially.
Preferably, the optical thickness of each pixel cell is provided with according to described first magnitude of voltage.
A sixth aspect of the present invention is that a kind of can the utilization by a plurality of the fields that form is listed as the image display of representing the intermediate grey scales of incoming video signal and carrying out gray level display according to incoming video signal, have: the display that comprises liquid crystal pixel cells, described liquid crystal pixel cells utilization comes display image according to the gray level of driving voltage, wherein drives described display when changing bright/dark time ratio.
Preferably, thus drive described display make bright/dark than in dark ratio become greatly.
Preferably, this equipment also has the drive part that is used to generate corresponding to the driving voltage of effective voltage, described effective voltage comprises corresponding to first voltage of bright level with corresponding to second voltage of black level, and described first voltage characteristic value that is set to be higher than liquid crystal cells begins to become basic voltage when maximum.
A seventh aspect of the present invention is a kind of method for displaying image that can carry out gray level display according to incoming video signal, have: the grey level transition step, this step is the characteristic value with respect to the pixel of the image two-dimensional arrangements that will show with the grey level transition of incoming video signal, wherein said grey level transition step conversion gray level is so that comprise that in a plurality of pixels of expression intermediate grey scales at least one pixel that is converted into first characteristic value and at least one are converted into the pixel of second characteristic value, wherein first characteristic value is by obtaining on the gray level that the positive correction value is added to incoming video signal, and second characteristic value obtains by adding the negative correction value.
A eighth aspect of the present invention is a kind of method for displaying image that can carry out gray level display according to incoming video signal, have: the gray level expressing step, the intermediate grey scales of described incoming video signal is represented in this step utilization by a plurality of the field row that form, wherein said gray level expressing step is represented gray level and is converted into the field of second characteristic value so that comprise at least one field that is converted into first characteristic value with at least one, wherein first characteristic value is by obtaining on the gray level that the positive correction value is added to incoming video signal, and second characteristic value obtains by adding the negative correction value.
A ninth aspect of the present invention is a kind of method for displaying image that can carry out gray level display according to incoming video signal, have: the grey level transition step, this step is the characteristic value with respect to the pixel of the image two-dimensional arrangements that should show with the grey level transition of incoming video signal; With the gray level expressing step, the intermediate grey scales of described incoming video signal is represented in this step utilization by a plurality of the field row that form, wherein said grey level transition step conversion gray level is so that comprise that in a plurality of pixels of expression intermediate grey scales at least one pixel that is converted into first characteristic value and at least one are converted into the pixel of second characteristic value, wherein first characteristic value is by obtaining on the gray level that the positive correction value is added to incoming video signal, second characteristic value obtains by adding the negative correction value, and described gray level expressing step is represented gray level and is converted into the field of second characteristic value so that comprise at least one field that is converted into first characteristic value with at least one, wherein first characteristic value is by obtaining on the gray level that the positive correction value is added to incoming video signal, and second characteristic value obtains by adding the negative correction value.
A tenth aspect of the present invention is that a kind of can the utilization by a plurality of the fields that form is listed as the method for displaying image of representing the intermediate grey scales of incoming video signal and carrying out gray level display according to incoming video signal, have: generate the step corresponding to the driving voltage of effective voltage, described effective voltage comprises corresponding to first voltage of bright level with corresponding to second voltage of black level; And the driving voltage that is generated is applied to the step of liquid crystal cells, wherein said second voltage is set to be lower than the threshold voltage according of liquid crystal cells.
A eleventh aspect of the present invention is that a kind of can the utilization by a plurality of the fields that form is listed as the method for displaying image of representing the intermediate grey scales of incoming video signal and carrying out gray level display according to incoming video signal, have: generate the step corresponding to the driving voltage of effective voltage, described effective voltage comprises corresponding to first voltage of bright level with corresponding to second voltage of black level; And the driving voltage that is generated is applied to the step of liquid crystal cells, and wherein said first voltage is set to be higher than the voltage of following specific voltage, and at this specific voltage place, the characteristic value of liquid crystal cells begins to become maximum substantially.
A twelveth aspect of the present invention is that a kind of can the utilization by a plurality of the fields that form is listed as the method for displaying image of representing the intermediate grey scales of incoming video signal and carrying out gray level display according to incoming video signal, have: drive the display that comprises liquid crystal cells when changing bright/dark time ratio, described liquid crystal cells utilization comes display image according to the gray level of driving voltage.
Effect of the present invention:
According to the present invention, can use a plurality of pixels to show intermediate grey scales, and improve the viewing angle characteristic simultaneously.
Description of drawings
[Fig. 1] Figure 1A to Fig. 1 D is the figure that is used to illustrate shake commonly used.
[Fig. 2] Fig. 2 A to Fig. 2 C is other figure that are used to illustrate shake commonly used.
[Fig. 3] Fig. 3 shows the ios dhcp sample configuration IOS DHCP of the image display of using the first embodiment of the present invention.
[Fig. 4] Fig. 4 A and Fig. 4 B are used to illustrate the situation of utilizing dither matrix to carry out shake.
[Fig. 5] Fig. 5 shows the pixel output that should the proofread and correct relation with respect to input gray grade.
[Fig. 6] Fig. 6 A and Fig. 6 B are the figure that is used to illustrate by the viewing angle characteristic of using image display improvement of the present invention.
[Fig. 7] Fig. 7 A and Fig. 7 B are other figure that are used to illustrate by the viewing angle characteristic of using image display improvement of the present invention.
[Fig. 8] Fig. 8 A and Fig. 8 B are used to the situation that illustrates that a dither matrix is made up of four pixels of F1 to F4.
[Fig. 9] Fig. 9 shows the configuration of the image display of using the second embodiment of the present invention.
[Figure 10] Figure 10 shows the density (transmitance) that the is shown video relation with respect to the level of incoming video signal.
[Figure 11] Figure 11 shows that the first half has 50% density and the latter half has the image-region of 100% density.
[Figure 12] Figure 12 shows in the situation of the image that shows Figure 11 by a plurality of the field row of forming;
The density of regional P till [Figure 13] Figure 13 A to Figure 13 C shows in the row on the scene from time t0 to time t1.
[Figure 14] Figure 14 A and Figure 14 B are used to illustrate the situation of finding binary brightness based on inclination viewing angle characteristic.
[Figure 15] Figure 15 A and Figure 15 B show the example of the dark some T (v2) of the bright some T (v1) of brightness ratio original pixels in the bi-values that is presented at discovery and brightness ratio original pixels with the sawtooth attitude.
[Figure 16] Figure 16 A and Figure 16 B show the example that only forms dither matrix by the G among replacement R, G and the B.
[Figure 17] Figure 17 shows the configuration of optimizing shake based on measured inclination viewing angle.
[Figure 18] Figure 18 is used to illustrate first method, and the first method optimization is applied to the voltage of black level of the driving voltage of liquid crystal and selects, so that make the liquid crystal response waveform approach width modulation (PWM) waveform and improve the viewing angle characteristic.
[Figure 19] Figure 19 A to Figure 19 E is used to illustrate first method, and the first method optimization is applied to the voltage of black level of the driving voltage of liquid crystal and selects, so that make the liquid crystal response waveform approach width modulation (PWM) waveform.
[Figure 20] Figure 20 A and Figure 20 B are used to illustrate second method, and second method is optimized the voltage selection of white level and optimized refractive index anisotropy Δ nd (d is a plate thickness) to improve the viewing angle characteristic.
[Figure 21] Figure 21 A and Figure 21 B show liquid crystal display commonly used and adopt corresponding to light transmission rate in the liquid crystal display of second method of the present embodiment of Figure 20 B with respect to the relation of input gray grade.
[Figure 22] Figure 22 is used to illustrate the example according to the driving method of third party's method, and this driving method makes, and bright/dark time ratio becomes 1: 2.
[Figure 23] Figure 23 A and Figure 23 B show liquid crystal display commonly used and adopt corresponding to light transmission rate in the liquid crystal display of third party's method of the present embodiment of Figure 20 B with respect to the relation of input gray grade.
[Figure 24] Figure 24 A to Figure 24 C show liquid crystal display commonly used and adopt second method of present embodiment and the liquid crystal display of cubic method in light transmission rate with respect to the relation of input gray grade.
[Figure 25] Figure 25 A and Figure 25 B show liquid crystal display commonly used and adopt in the liquid crystal display of the 5th method of present embodiment light transmission rate with respect to the relation of input gray grade.
[Figure 26] Figure 26 A to Figure 26 C shows the driving voltage waveform of bright dark time in the liquid crystal display of using liquid crystal display and second method that adopts present embodiment and cubic method always.
[Figure 27] Figure 27 A and Figure 27 B show the driving voltage waveform of bright dark time in the liquid crystal display of using liquid crystal display and the 5th method that adopts present embodiment always.
[Figure 28] Figure 28 shows first example of configuration of the liquid crystal display (image display) of the driving method that can use present embodiment.
[Figure 29] Figure 29 shows second example of configuration of the liquid crystal display (image display) of the driving method that can use present embodiment.
[Figure 30] Figure 30 shows the 3rd example of configuration of the liquid crystal display (image display) of the driving method that can use present embodiment.
[Figure 31] Figure 31 A to Figure 31 C shows the γ pattern of γ pattern, reference voltage generator of the data converter that is provided with and the liquid crystal applied voltages relation with respect to the input data in the equipment of Figure 30.
[Figure 32] Figure 32 shows the 4th example of configuration of the liquid crystal display (image display) of the driving method that can use present embodiment.
[Figure 33] Figure 33 A to Figure 33 C shows the γ pattern of γ pattern, reference voltage generator of the data converter that is provided with and the liquid crystal applied voltages relation with respect to the input data in the equipment of Figure 32.
[Figure 34] Figure 34 shows the 5th example of configuration of the liquid crystal display (image display) of the driving method that can use present embodiment.
[Figure 35] Figure 35 A to Figure 35 E shows the γ pattern of γ pattern, reference voltage generator of the data converter that is provided with and the liquid crystal applied voltages relation with respect to the input data in the equipment of Figure 32.
[Figure 36] Figure 36 shows the 6th example of configuration of the liquid crystal display (image display) of the driving method that can use present embodiment.
[Figure 37] Figure 37 A to Figure 37 F shows the γ pattern of γ pattern, reference voltage generator of the data converter that is provided with and the liquid crystal applied voltages relation with respect to the input data in the equipment of Figure 32.
[Figure 38] Figure 38 shows the 7th example of configuration of the liquid crystal display (image display) of the driving method that can use present embodiment.
Denotational description:
10: image display
11: luminance transducer
12: the skew generator
13: the first adder circuit
14: the second adder circuit
15: the first electric pressure converters
16: the second electric pressure converters
17: kicker
18: controller
21: display
20: image display
21: nonlinear converter
22: the skew generator
23: offset table
24: the first adder circuit
25: the second adder circuit
26: the first inverse converters
27: the second inverse converters
28: the time cutting processor
29: controller
30: display
40,40A to 40F: liquid crystal display (image display)
41,41C, 41F: data converter
42,42A: reference voltage generator
43: Source drive
44: display panel
Embodiment
Embodiments of the invention are described below with reference to the accompanying drawings.
In an embodiment, will adopt in response to incoming video signal via the image display of direct viewing type LCDs display image as example.
Fig. 3 shows the ios dhcp sample configuration IOS DHCP according to the image display of first embodiment of the invention.
As shown in Figure 3, have will be as applying the luminance transducer 11 that vision signal H that signal voltage provides is converted to luminance signal based on the predetermined nonlinear characteristic of sending out for image display 10, be provided for the skew generator 12 of incoming video signal H, be used for addition and subtract each other first adder circuit 13 and second adder circuit 14 from the output signal of luminance transducer 11 and offset table, be provided for first electric pressure converter 15 of the result of calculation of first adder circuit 13, be provided for second electric pressure converter 16 of the result of calculation of second adder circuit 14, be provided for from first and second electric pressure converters 15 and the signal V1 of 16 outputs and the kicker 17 of V2, be used to control the controller 18 of kicker 17 and show display 19 in response to the image of incoming video signal H based on output signal Cout from kicker 17.
Luminance transducer 11 is converted to luminance signal L based on the nonlinear characteristic that sets in advance with the vision signal H that is provided.
The nonlinear characteristic that is provided with in luminance transducer 11 can freely be provided with, and can for example be represented by nonlinear curve that also the gradient of this curve becomes milder along with the voltage step-down.
The signal L that is converted into brightness from voltage in luminance transducer 11 is provided to first adder circuit 13 and second adder circuit 14.
Skew generator 12 generates signal D1 and signal D2, and signal D1 and signal D2 are expressed as the pixel output of the gray level (hereinafter being called input gray grade) of the vision signal H that correction provides.
Skew generator 12 by with reference to the offset table that sets in advance, generates the signal D1 and the D2 that are used to be offset from the luminance signal L of luminance transducer 11 according to the signal voltage that applies of the vision signal H that is provided.
The signal D1 that generates at skew generator 12 places is output to first adder circuit 13, and signal D2 is output to second adder circuit 14.
Notice that offset table in the skew generator 12 and the signal D1 that will generate and the details of D2 will illustrate below.
First adder circuit 13 is provided for from the signal L of luminance transducer 11 with from the signal D1 that is offset generator 12.
First adder circuit 13 is subtraction signal D1 from signal L, and the signal E1 that will as a result of obtain is provided to first electric pressure converter 15.
First electric pressure converter 15 will provide the signal E1 from first adder circuit 13 to be converted to the γ characteristic once more based on the nonlinear characteristic that sets in advance.
This nonlinear characteristic that is provided with in first electric pressure converter 15 is represented as and the opposite characteristic of nonlinear characteristic that is provided with in luminance transducer 11.Owing to this reason, during the nonlinear characteristic that is provided with in being updated in luminance transducer 11, therewith explicitly, the nonlinear characteristic that is provided with in first electric pressure converter 15 also is updated.
Signal V1 by 15 conversions of first electric pressure converter is output to kicker 17.
Second electric pressure converter 16 will provide the signal E2 from second adder circuit 14 to be converted to the γ characteristic once more based on the nonlinear characteristic that sets in advance.
This nonlinear characteristic that is provided with in second electric pressure converter 16 is represented as and the opposite characteristic of nonlinear characteristic that is provided with in luminance transducer 11.Owing to this reason, during the nonlinear characteristic that is provided with in being updated in luminance transducer 11, therewith explicitly, the nonlinear characteristic that is provided with in second electric pressure converter 16 also is updated.
Signal V2 by 16 conversions of second electric pressure converter is output to kicker 17.
Fig. 4 is used to illustrate that the kicker 17 of present embodiment uses dither matrix to carry out the situation of dithering process.
Shown in Fig. 4 A, this shake is pseudo-has represented the image-region be made up of a plurality of pixels of intermediate grey scales, these a plurality of pixels are formed the two-dimentional dither matrix that is made of two class pixels, one class has first characteristic value (being transmitance in the present embodiment), another kind of have second characteristic value (being transmitance in the present embodiment), this two classes pixel along continuous straight runs and vertical direction are expressed as the regular pattern of checkerboard, shown in Fig. 4 B.
Operation before the image display 10 according to first embodiment of the invention generates above-mentioned two-dimentional dither matrix will be described below.
Fig. 5 shows the pixel output that will proofread and correct and the relation between the input gray grade.
In Fig. 5, horizontal ordinate indication input gray grade (transmitance), ordinate indication characteristic value (transmitance).
In common shake, predetermined shake coefficient is added to the correspondence position of a plurality of pixels.Thereby input signal is corrected and makes the average output that obtained by a plurality of pixel addition show linear relationship shown in the straight line b among Fig. 5 with respect to input gray grade, thereby obtains synthetic pixel output.
In contrast, in the image display 10 of present embodiment, for example a pair of pixel (sub-pixel) is corrected based on the relation of the output of the pixel shown in a among Fig. 5 and c with respect to input gray grade, and is controlled to obtain the first characteristic value VALa and the second characteristic value VALc.
Particularly, in this was proofreaied and correct, positive correction value Δ k2 was added to as shown in Figure 5 straight line b obtaining the first characteristic value VALa, and negative correction value Δ k1 is deducted from straight line b to obtain the second characteristic value VALc.
In other words, generation is with respect to the positive correction value Δ k2 and the negative correction value Δ k1 of input gray grade.Thereby these corrected values and input gray grade addition obtain pixel output b.
As a result, dither matrix express by the addition first characteristic value VALa and the second characteristic value VALc and with the result divided by 2 intermediate grey scales that obtain.
This corresponding to via dither matrix by addition as shown in Figure 5 concern pixel output (transmitance) that a and c represent and with the result divided by 2 relational expressions that obtained.
By way of parenthesis, skew generator 12 in offset table storage pixel output in advance with respect to input gray grade concern a and c, with when drive signal H is transfused to reference to this offset table so that specify correction value delta k1 and Δ k2.
Concern a and the c that are stored in the pixel output in the offset table in advance are set to such form, this form comprises that in dither matrix at least one pixel that is converted into the first characteristic value VALa and at least one are converted into the pixel of second density, as shown in Figure 5, wherein the first characteristic value VALa obtains by negative correction value Δ k1 is added on the input gray grade, and second density obtains by positive correction value Δ k2 is added on the input gray grade.
For example, 100%) or minimum characteristics value (transmitance: 0%) the concern a and the c of pixel output are stored in the offset table, thereby make first characteristic value that obtains by addition negative correction value Δ k1 and positive correction value Δ k2 or in second characteristic value any one become maximum characteristic value (transmitance:.
In Fig. 5, negative correction value Δ k1 is set to make second characteristic value and becomes the minimum characteristics value, becomes 50% from transmitance 0%, becomes maximum characteristic value and positive correction value Δ k2 is set to make first characteristic value, becomes 100% from transmitance 50%.
Fig. 6 A and Fig. 6 B show in the situation that corrected value is provided with as mentioned above transmitance and with respect to the relation between the viewing angle (0 degree, 20 degree, 40 degree, 60 degree) of the LCDs of display 19, wherein Fig. 6 A shows the relation between the transmitance and viewing angle in based on the situation of common shake, and Fig. 6 B shows the relation between the transmitance and viewing angle in the present embodiment.
In Fig. 6 A and Fig. 6 B, the horizontal ordinate indication is according to the gray level that will be presented in the display 19, based on the transmitance (input) that provides from the output signal Cout of kicker 17, and the transmitance (output) of the gray level of ordinate indication actual displayed on display 19.
As shown in Figure 6A, when exporting based on the pixel of the linear relationship shown in the straight line b among Fig. 5 with acquisition based on common jitter correction input gray grade, as can be seen, along with greatly (in other words viewing angle becomes, watch in the situation of LCDs in inclination), the viewing angle characteristic obviously worsens.
In contrast, shown in Fig. 6 B, when determining first characteristic value and second characteristic value in the present embodiment so as to obtain pixel output concern a and c the time, as can be seen, even watch in the situation of LCDs in inclination, the viewing angle characteristic also has improvement.
Fig. 7 A and Fig. 7 B show the result of expression relation of the transmitance shown in Fig. 6 A and Fig. 6 B under the gray level that γ proofreaies and correct.In Fig. 7 A and Fig. 7 B, horizontal ordinate indication input gray grade, ordinate indication output gray level.
Shown in Fig. 7 A, in input gray grade can the situation by human eye actual gray level of seeing (hereinafter being called " output gray level ") via LCDs, when exporting based on the pixel with respect to input gray grade of the linear relationship shown in the straight line b among Fig. 5 with acquisition based on this gray level of common jitter correction, along with viewing angle becomes big, the linearity between input gray grade and the output gray level departs from gradually.This shows watches in inclination that the viewing angle characteristic obviously worsens in the situation of LCDs.
In contrast, shown in Fig. 7 B, when determining first characteristic value and second characteristic value in the present embodiment so as to obtain pixel output concern a and c the time, as can be seen, even watch in the situation of LCDs in inclination, the viewing angle characteristic also has improvement.
The reason why in this manner viewing angle makes moderate progress about, as shown in Figure 5, in transmitance for example is 50% situation, dither matrix be formed make pixel output concern that first characteristic value becomes 100% transmitance among a and the c, and second characteristic value becomes 0% transmitance.
Transmitance be 0% and 100% o'clock viewing angle characteristic do not worsen, therefore be 50% o'clock in transmitance, on the viewing angle characteristic, do not worsen divided by the intermediate grey scales of the dither matrixs of 2 expressions by addition first characteristic value and second characteristic value and with the result.
As can be seen, not occurring in transmitance according to departing from of viewing angle is in 50% the situation, shown in Fig. 6 B.
In addition, as shown in Figure 5, in the present embodiment, even become transmitance 50% from transmitance 0%, because second characteristic value is fixed to transmitance 0% and have only the transmitance of first characteristic value to change, so the viewing angle characteristic also no longer worsens with respect to second characteristic value at least.
Owing to this reason,, to compare during when showing with common shake divided by the intermediate grey scales of the dither matrixs of 2 expressions by addition first characteristic value and second characteristic value and with the result, the viewing angle characteristic also can improve.
Equally, as shown in Figure 5, in the present embodiment, even become transmitance 100% from transmitance 50%, because first characteristic value is fixed to transmitance 100% and have only the transmitance of second characteristic value to change, so the viewing angle characteristic also no longer worsens with respect to first characteristic value at least.
Owing to this reason,, to compare during when showing with common shake divided by the intermediate grey scales of the dither matrixs of 2 expressions by addition first characteristic value and second characteristic value and with the result, the viewing angle characteristic also can improve.
Like this, in the image display 10 of present embodiment, when utilizing first characteristic value and second characteristic value to represent the intermediate grey scales of dither matrix,, therefore can improve this amount of viewing angle characteristic because any one density in these two values is fixed to 0% or 100%.
Notice that present embodiment is not limited to such situation, promptly concern a and the c that become pixel output under the situation of maximum characteristic value or minimum characteristics value of any one in first characteristic value or second characteristic value is stored in the offset table.
If at least one pixel that is converted into first characteristic value (transmitance) is included in the dither matrix with the pixel that at least one is converted into second characteristic value (transmitance), then can obtain identical effect, wherein first characteristic value obtains by negative correction value Δ k1 being added input gray grade, and second characteristic value obtains by positive correction value Δ k2 being added input gray grade.For example, the relation of the output of the pixel shown in Fig. 5 also can be stored in the offset table by the curve of a ' and c ' definition.
In addition, in the above-described embodiments, the situation that dither matrix is made up of two pixels has been described, but the present invention is not limited to this situation.Can adopt any form, as long as dither matrix is made up of a plurality of pixels.
For example, when shown in Fig. 8 A, utilizing four pixel F1 to F4 to form a dither matrix, in the relation of the output of the pixel that should proofread and correct shown in Fig. 8 B with respect to input gray grade, in transmitance is 0% to 25% o'clock, the characteristic value (transmitance) of the pixel output of pixel F1 is offset very big degree, and pixel F2, F3 and F4 are fixed to the minimum characteristics value.
When transmitance was 25% to 50%, the characteristic value of the pixel of pixel F2 output was offset very big degree, and the transmitance of pixel F1 is fixed on maximal value (characteristic value), and the transmitance of pixel F3 and F4 is fixed on the minimum characteristics value.
When transmitance was 50% to 75%, the characteristic value of the pixel of pixel F3 output was offset very big degree, and pixel F1 and F2 are fixed on maximum characteristic value, and pixel F4 is fixed on the minimum characteristics value.
When transmitance was 75% to 100%, the characteristic value of the pixel of pixel F4 output was offset very big degree, and pixel F1, F2 and F3 are fixed on maximum characteristic value.
As a result, the pixel that can pseudo-ly produce shown in the straight line b among Fig. 8 B is exported.In addition, in this case, 0%) or maximum characteristic value (transmitance: 100%), therefore can also prevent the deterioration of viewing angle characteristic owing to have at least three pixels generally to be fixed on minimum characteristics value (transmitance: among the pixel F1 to F4.
Like this, in the image display 10 of first embodiment, when utilizing first characteristic value and second characteristic value to represent the intermediate grey scales of dither matrix, have only the characteristic value of a pixel forming this dither matrix to be offset.The characteristic value of other pixels generally is fixed on 0% or 100% characteristic value (transmitance).Therefore, can improve this amount of viewing angle characteristic.
The image display 10 of first embodiment uses along the technology of direction in space shake and utilizes a plurality of pixels to represent a gray level, so that improve the viewing angle characteristic.
In contrast, the image display 20 of second embodiment utilizes along the pixel of the multi-screen of time orientation arrangement represents a gray level, so that improve the viewing angle characteristic.
Below, a screen is also referred to as " one ", is called as " row " by a plurality of the row of forming.Notice that the term in this explanation " field " is not limited to the field in the so-called staggered scanning.
The block diagram of Fig. 9 shows the ios dhcp sample configuration IOS DHCP according to the image display 20 of second embodiment.
As shown in Figure 9, image display 20 has nonlinear converter 21, skew generator 22, offset table 23, first adder circuit 24, second adder circuit 25, first inverse converter 26, second inverse converter 27, time cutting processor 28, the controller 29 that is used for control time cutting processor 28 and display 30.
The non-linear I/O characteristic that is provided with in nonlinear converter 21 is the nonlinear curve of being represented by so-called gamma function, wherein along with level step-down gradient variable gets gently.Notice that this non-linear I/O characteristic can freely be provided with.
Be provided for first adder circuit 24 and second adder circuit 25 from the vision signal L after level conversion of nonlinear converter 21 outputs.
Offset table 23 shows the table with respect to the value of corresponding offset signal delta k1 of the signal level of incoming video signal H and Δ k2.
Note, be described further below from first offset signal delta k1 of skew generator 22 outputs and the details of the second offset signal delta k2.
Be provided for first adder circuit 24 from the first offset signal delta k1 of skew generator 22 outputs.Be provided for second adder circuit 25 from the second offset signal delta k2 of skew generator 22 outputs.
The first adder circuit 24 addition vision signal L and the first offset signal delta k1 are to generate vision signal E1.
The vision signal E1 that is generated by first adder circuit 24 is provided to first inverse converter 26.
The vision signal E2 that is generated by second adder circuit 25 is provided to second inverse converter 27.
First inverse converter 26 receives vision signal E1 from 24 outputs of first adder circuit as input.First inverse converter 26 is according to the level of the predetermined non-linear I/O characteristic conversion incoming video signal E1 that sets in advance.
Second inverse converter 27 receives vision signal E2 from 25 outputs of second adder circuit as input.Second inverse converter 27 is according to the level of the predetermined non-linear I/O characteristic conversion incoming video signal E2 that sets in advance.
The non-linear I/O characteristic that is provided with in first inverse converter 26 and second inverse converter 27 is and the opposite characteristic of non-linear I/O characteristic that is provided with in nonlinear converter 21.
For example, if be set in the nonlinear converter 21, this means that then contrary gamma characteristic is set in first inverse converter 26 and second inverse converter 27 according to the I/O characteristic of gamma function.
Owing to this reason, during the nonlinear characteristic that is provided with in being updated in nonlinear converter 21, therewith explicitly, the nonlinear characteristic that is provided with in first inverse converter 26 and second inverse converter 27 also will be upgraded.
Vision signal V1 after first inverse converter, 26 level conversion is provided for time cutting processor 28.In addition, the vision signal V2 after second inverse converter, 27 level conversion also is provided for time cutting processor 28.
Note, nonlinear converter 21 has the identical assembly of luminance transducer 11 in the image display 10 with first embodiment, skew generator 22 and offset table 23 have skew generator 12 assembly identical with offset table in the image display 10 with first embodiment, first adder circuit 24 has the identical assembly of first adder circuit 13 in the image display 10 with first embodiment, and second adder circuit 25 has the identical assembly of second adder circuit 14 in the image display 10 with first embodiment.In addition, first inverse converter 26 has the identical assembly of first electric pressure converter 15 in the image display 10 with first embodiment, and second inverse converter 27 has the identical assembly of second electric pressure converter 16 in the image display 10 with first embodiment.
In addition, the connection in the image display 10 of the connection of said modules and first embodiment is identical.
The first frequency upconversion unit, the 281 vision signal V1s of reception after first inverse converter, 26 level conversion are as input.The screen display speed (60Hz) of vision signal V1 is identical with the speed of original video signal H.
The first frequency upconversion unit 281 is converted to 120Hz with the screen display speed of incoming video signal V1 from 60Hz.Frequency upconversion is for example carried out twice by repeating to export same screen in the first frequency upconversion unit 281.
The second frequency upconversion unit, the 282 vision signal V2s of reception after second inverse converter, 27 level conversion are as input.The screen display speed (60Hz) of vision signal V2 is identical with the speed of original video signal H.
The second frequency upconversion unit 282 is converted to 120Hz with the screen display speed of incoming video signal V2 from 60Hz.Frequency upconversion is for example carried out twice by repeating to export same screen in the second frequency upconversion unit 282.
Owing to this reason, switch the vision signal Cout that output unit 283 output screens show speed 120Hz, wherein be alternately repeated by the screen of addition first offset signal delta k1 generation and the screen that generates by the addition second offset signal delta k2.
Be provided to display 30 from the vision signal Cout that switches output unit 283 outputs.
In display 30, LCDs changes the transmitance with the corresponding pixel position of vision signal Cout, with the difference screen of display video signal.Here, even when screen display speed is 120Hz, the exchange current of liquid crystal also is set as 60Hz.This is to apply DC electric current and follow-up pre-burning or flicker in order to prevent to liquid crystal.
Processing operation according to the image display 20 of second embodiment will be described below.
Here, between two continuous screens of the vision signal after frequency upconversion screen display speed, a screen is called as " first " earlier, and back one is shielded and is called as " second ".
Notice that although used term " field ", this and interleaved " field " be relation not.
Figure 10 shows the characteristic value (transmitance of liquid crystal) that is presented on the display 30 relation with respect to the signal level (gray level) of incoming video signal H.
As shown in figure 10, in image display 20, the first offset signal delta k1 is added on first FLD1, and the second offset signal delta k2 is deducted from second FLD2.
Owing to this reason, in image display 20, such outputting video signal Cout is provided to display 30, in this outputting video signal Cout, and the alternately repetition of field that field (first) and the level that level is proofreaied and correct by forward proofreaied and correct by negative sense.
Here, human vision has integral characteristic on time orientation, and therefore, the field of proofreading and correct when the field of being proofreaied and correct by forward with by negative sense is during by Alternation Display, and what the user felt is the image with identical average level value.
Owing to this reason, puppet watches that the user that is presented at the video image on the display 30 sees is vision signal AFDL12 by the average level representative of first FLD1 and second FLD2.
Therefore, in image display 20, offset signal delta k1 is confirmed as making video image to become with Δ k2 and does not add that the ordinary video image of being seen in the situation of offset signal delta k1 and Δ k2 is identical when asking average first FLD1 and second FLD2.
The skew generator 22 of image display 20 generates the first offset signal delta k1 and the second offset signal delta k2 by reference offset table 23.
Offset table 23 in advance the storage pixel output level with respect to the relation between the level (input gray grade) of raw video signal.No matter when incoming video signal H specifies Δ k1 and Δ k2 by reference offset table 23 to skew generator 22.
For example, consider situation as shown in figure 11, shown screen w among Figure 11, wherein the first half zone of screen w is the zone by the gray level display of transmitance 50%, and the latter half zone of screen w is the zone by the gray level display of transmitance 100%.
As shown in figure 12, in this case, first FLD1 becomes the image that whole screen is shown by the gray level of transmitance 100%.In addition, in second FLD2, the first half zone of screen is by the gray level display of transmitance 0%, and the latter half zone of screen is by the gray level display of transmitance 100%.
When display screen w, this first FLD1 and second FLD2 be by Alternation Display, can pseudo-ly show that therefore the subregional density of the first half is regarded as the image of 0% and 100% combined density.
In addition, in image display 20, Δ k1 and Δ k2 are stored in the offset table 23, so that by adding value that the first offset signal delta k1 obtains or becoming maximum characteristic value (transmitance 100%) or minimum characteristics value (transmitance 0%) by any one that deducts in the value that the second offset signal delta k2 obtains.
In above-mentioned Figure 10, the second offset signal delta k2 is provided so that the characteristic value (transmitance) of second FLD2 becomes minimum value (minimum transmitance), the level of incoming video signal becomes 50% from 0%, and the first offset signal delta k1 is provided so that the characteristic value (transmitance) of first FLD1 becomes maximal value (maximum transmission), and the level of incoming video signal becomes 100% from 50%.
Owing to this reason, as shown in FIG. 13A, when for example representing intermediate grey scales e1, first FLD1 from time t0 to time t1/2 is based on transmitance g1, and second FLD2 from time t1/2 to time t1 is set at transmitance 0%.
Therefore, might be to the image-region of the pseudo-projection of the user intermediate grey scales e1 that watches continuous array (after this being called " row ") from time t0 to time t1.
In addition, for example, when expression intermediate grey scales e2 shown in Figure 13 B, time t0 is based on transmitance g2 to first FLD1 of time t1/2, and time t1/2 is set to transmitance 0% to second FLD2 of time t1.
The image-region that might present thus, intermediate grey scales e2 to user's puppet of watching field row continuously from time t0 to time t1.
In addition for example, shown in Figure 13 C, when expression had the intermediate grey scales e3 of high permeability, first FLD1 from time t0 to time t1/2 was based on transmitance 100%, and second FLD2 from time t1/2 to time t1 is set to transmitance g3.
The image-region that might present thus, intermediate grey scales e3 to user's puppet of watching field row continuously from time t0 to time t1.
Like this, in using image display 20 of the present invention, 0%) or maximum characteristic value (transmitance: 100%) when utilizing first characteristic value (transmitance) and second characteristic value (transmitance) to represent the intermediate grey scales of dither matrix, wherein any characteristic value is fixed to minimum characteristics value (transmitance:.
These two characteristic values (transmitance) 0% and 100% have all provided good viewing angle characteristic, therefore, by any one characteristic value being arranged on minimum characteristics value or maximum characteristic value, can improve this amount of viewing angle characteristic.
Like this, in the mode identical, improved in the situation that this offset signal delta k1 and Δ k2 are set transmitance with respect to the relation between the viewing angle of the LCDs of display 30 with the spatial jitter situation.
Notice that in a second embodiment, a gray level is by two demonstrations continuously, but the present invention is not limited to this.Gray level can show by any way, as long as gray level is represented as at least one field that comprises at least one that is converted into first characteristic value in the field row of forming in continuous field by two or more and be converted into second characteristic value, wherein first characteristic value is to obtain by the gray level that positive correction value (off-set value) is added vision signal, and second characteristic value is to obtain by the gray level that negative correction value (off-set value) is added vision signal.
Notice that the present invention is not limited to above-mentioned first embodiment and second embodiment.For example when incoming video signal H is made of moving image, also can control kicker 17 and represent intermediate grey scales as two dimensional image to use dither matrix, and when incoming video signal H is made of rest image, also can controls kicker 17 and represent intermediate grey scales so that use is listed as.
In addition, can both have according to the image display of present embodiment and to utilize dither matrix to represent the configuration of intermediate grey scales, and have again and utilize a tabulation to show the configuration of intermediate grey scales, perhaps also can only have a kind of in two kinds of configurations.
In addition, this image display is not limited to represent the situation of the intermediate grey scales of monochrome image.Based on constructed, also can represent intermediate grey scales by the vision signal of three primary colors brightness composition R, G and B representative.
In addition, in image display 10, very naturally, the correction value delta k1 and the Δ k2 that are arranged in the skew generator 12 can freely be provided with in advance by the user.
In addition, in this image display 10, in the situation of LCDs is watched in inclination, can also measure so-called inclination and watch the angle, and watch dithering process in the angle and optimizing kicker 17 based on measured inclination.
Usually, the reason of black spot defect not taking place when where tilting to watch the angle very big may be because the providing of viewing angle compensate film.In addition, in intermediate grey scales, when the deviation of gamma characteristic becomes big, the relaxation phenomenon of tangible skin color can appear in the color that is stored as the gray level with different R, G and B.In order to address this problem, be necessary to reduce gamma characteristic is watched the angle with respect to inclination variation.
Owing to this reason, find two values, the original level of these two values is being asked mean time to provide identical brightness (transmitance), but differs Δ T each other.
Figure 14 A and Figure 14 B show watch the angle be in the situations of 0 degree, 30 degree, 45 degree and 60 degree light transmission rate with respect to the relation of input gray grade.For example, the brightness that obtains as the result who asks average T 1 (V1) and T2 (V2) is defined as T0 (v0), shown in Figure 14 A.In addition, when the actual gamma characteristic that records when the dark direction shown in Figure 14 A moves,
T60_org＝T0(v0)+ΔT(v0) (1)
T60_dither＝
(T0(v1)+ΔT(v1)+T0(v2)+ΔT(v2))/2
＝T0(v1)/2+ΔT(v1)/2+T0(v2)/2+ΔT(v2)/2 (2)
T0(v0)＝(T1(v1)+T2(v2))/2 (3)
Therefore,
T60_dither＝T0(v0)+ΔT(v1)/2+T0(v2)/2 (4)
Notice that above variable is represented following value.
V0: the normal drive voltage that is used to show the intermediate grey scales of expectation;
V1: be used to obtain in the present invention by adding the driving voltage of the characteristic value that the positive correction value obtains;
V2: be used to obtain in the present invention by adding the driving voltage of the characteristic value that the negative correction value obtains;
T0 (v0): target intermediate grey scales transmitance;
T1 (v1): in the present invention by adding the characteristic value of positive correction value acquisition;
T2 (v2): in the present invention by adding the characteristic value of negative correction value acquisition;
Δ T (v0): when v0, watch the transmitance at 60 ° at angle and watch poor between the transmitance at 0 ° at angle;
Δ T (v1): when v1, watch the transmitance at 60 ° at angle and watch poor between the transmitance at 0 ° at angle;
Δ T (v2): when v2, watch the transmitance at 60 ° at angle and watch poor between the transmitance at 0 ° at angle;
T60_org: the transmitance of under driven, watching 60 ° at angle; And
T60_dither: the transmitance of watching 60 ° at angle in the present invention.
In addition, Δ T (v1)/2+ Δ T (v2)/2＜Δ T (v0), therefore, Δ T60_dither becomes less than Δ T60_org, and brightness diminishes with the fluctuation of viewing angle.Farthest improved such condition, promptly Δ T is independently of one another in this case, is clamped to 0 up to a side.Watch the variation of the gamma characteristic that the angle causes to diminish owing to tilting.
In addition, when the actual gamma characteristic that records during to as shown in Figure 14B bright direction skew, Δ T (v1)/2+ Δ T (v2)/2＞Δ T (v0), therefore, Δ T60_dither becomes greater than Δ T60_org, so brightness with the fluctuation of viewing angle variation.In this situation, find optimum point by utilizing original value T (V0) or changing Δ T.
Subsequently, two values that find are used to spatial jitter.At this moment, the gamma characteristic according to each pixel finds this two values as mentioned above, and shows with the sawtooth state than brighter some T (v1) of original pixels and the some T (v2) darker than the brightness between two values that find, shown in Figure 15 A.
By way of parenthesis, for RGB, when in the same manner with sawtooth attitude display pixel, they will be represented that one by (r1, g1 b1) form, and another is by (r2, g2 b2) form by two brightness values.
After having applied spatial jitter by this way, further application time shake.The sawtooth state that Figure 15 B shows the pattern in Figure 15 A is along with the example under the preceding of time and then the situation about being inverted, and these patterns are by Alternation Display.
By such overlay space shake and time jitter, can produce high-quality combination image, wherein there is not flicker, discover less than grid, and viewing angle has obtained expansion.
Notice that for R, G and B, in the situation with sawtooth attitude display pixel as mentioned above, any former colour brightness composition can be replaced.
Figure 16 A and Figure 16 B show the example under the situation that the G in having only R, G and B is replaced.In the example shown in Figure 16 A and the 16B, by (r1, g2, b1) brightness value of Zu Chenging and by (b2) brightness value of Zu Chenging spatially is arranged as the sawtooth state for r2, g1.This layout is shaken by application time and is reversed.
In this case, what present to the user is not black and white sawtooth layout, but is similar to the appearance of the complementary colors board layout of G.
That is, in the example of Figure 16 A and 16B, the luminance difference between the neighbor is very little, and grid is difficult to see that it is more level and smooth that the edge seems, and for each pixel has found jitter value, so the deterioration of resolution is very little.
Figure 17 shows the configuration that will watch the angle to optimize shake based on measured inclination and is installed to example in the image display 10.
Pixel is arranged with the sawtooth state, shown in Figure 15 A.When dither matrix is made up of two values, promptly by (r1, g1, b1) brightness value of Zu Chenging and by (r2, g2 is when b2) brightness value of forming is formed, this means that this equipment watches angular dimensions part 32 and kicker 17A to constitute by two-value generator 31, the inclination that is connected to this two-value generator 31, wherein import by input brightness (r0, g0, b0) the vision signal H of Zu Chenging to two-value generator 31.
Two-value generator 31 based on seek about the above-mentioned equation (1) of incoming video signal H to equation (4) brightness (r1, g1, b1) and brightness (r2, g2, b2).Two brightness values that find in this two-value generator 31 are sent to kicker 17A.
By way of parenthesis, two-value generator 31 watches the inclination at angle to watch angular dimensions unit 32 with reference to the inclination that records with parametric form administrative institute when seeking these two brightness values.
When send from two-value generator 31 these two brightness (r1, g1, b1) and brightness (in the time of b2), kicker 17A carries out aforesaid dithering process based on this for r2, g2.
As mentioned above, in a second embodiment, illustrated to utilize and shielded gray level of expression continuously so that improve the time jitter of viewing angle characteristic along continuously arranged two of time orientation.
Below explanation is included in utilization in the notion of second embodiment and shows the driving method of the intermediate grey scales of incoming video signal by following a plurality of the field tabulations of forming.
Below first method, second method and third party's method will be described in proper order, wherein first method has been optimized the voltage selection of the black level of the driving voltage that is applied to liquid crystal, optimized plate thickness, and make the liquid crystal response waveform approach so-called width modulation (PWM) waveform to improve the viewing angle characteristic, second method has been optimized the voltage of white level and has been selected, and optimized plate thickness improving the viewing angle characteristic, third party's method is bright by changing/the dark time recently the drive surface plate to improve the viewing angle characteristic.
At first first method will be described, first method has been optimized the voltage selection of the black level of the driving voltage that is applied to liquid crystal, and makes the liquid crystal response waveform approach so-called width modulation (PWM) waveform to improve the viewing angle characteristic, as shown in figure 18.
In liquid crystal display commonly used, driving voltage for example is set at by in the scope shown in the X of Figure 19 A, that is, black level is set to equal substantially the value of threshold voltage, and as 1.9V, and white level is set at 4.0V.
Driving voltage waveform is shown in Figure 19 B in this situation, light transmission rate with respect to the relation of input gray grade shown in Figure 19 C.
In this situation, in that effectively the rising and the sloping portion of driving voltage waveform do not obtain enough acutancees (not obtaining enough response characteristics).Watching the angle is in the γ characteristic of 60 degree, trends towards providing the waveform different with the ideal curve shown in the A by the actual characteristic shown in the B.
In contrast, in first method according to present embodiment, driving voltage is set at by in the scope shown in the Y of Figure 19 A, promptly, black level is set to be lower than the voltage of threshold voltage (for example 1.9V), be 0V in the example of Figure 19 A promptly, and white level is set at 4.0V.
Driving voltage waveform is shown in Figure 19 D in this situation, light transmission rate with respect to the relation of input gray grade shown in Figure 19 E.
In this situation, rising and sloping portion in effective driving voltage waveform have obtained enough acutancees (having obtained enough response characteristics), and can control so that pulsewidth is narrowed down, watching the angle is in the γ characteristic of 60 degree, is trended towards providing the waveform that is similar to the ideal curve shown in the A by the actual characteristic shown in the B.
Promptly, as shown in figure 18, be set to be lower than value (because this value lower (near 0V) of threshold value by the magnitude of voltage of black level, therefore can form the driving voltage waveform that can provide the better response characteristic), advantage below having obtained: it can be so that the liquid crystal response waveform approaches so-called width modulation (PWM) waveform, thereby improves the viewing angle characteristic of intermediate grey scales.
In addition, the liquid crystal response characteristic is improved, and has therefore obtained with respect to the also improved advantage of the response of moving image.
Below second method will be described, second method has been optimized the voltage of white level and has been selected, and has optimized the optical unit thickness deltat nd by the product representative of the thickness d of refractive index anisotropy Δ n and liquid crystal layer, so that improve the viewing angle characteristic.
Basically, in second method, the voltage of white level is not set at the 4V that presents maximum transmission, but greater than the value of 4V, as 5V.
Shown in Figure 20 A, when observing R, G and B signal respectively,, also transmitance can be remained on maximum horizontal, but the transmitance of B signal trends towards step-down even when on the white level of R and G, applying 4V as drive level.
Therefore, shown in Figure 20 B, in the present embodiment, the voltage of white level is not set at the 4V that presents maximum transmission, but greater than the value of 4V, as 5V.By 5V is made as white level, the level when can the transmitance when showing in vain remaining on 4V or bigger.
In addition, in second method of present embodiment, in common liquid crystal display, be set at 270nm for the optical unit thickness deltat nd of the pixel cell of 310nm, and in common liquid crystal display, be that the optical unit thickness deltat nd of the pixel cell of 330nm is set at 285nm with respect near wavelength 450nm (wavelength of B) with respect near wavelength 546nm (wavelength of G).
That is, thus having constructed the liquid crystal panel that adopts second method makes the attenuation of optical unit thickness.
Notice that in second method, black level is arranged near the value the threshold value in the mode identical with common liquid crystal display, perhaps be arranged on the value that is lower than threshold value in the mode identical with first method.
Figure 21 A shows corresponding to light transmission rate in the liquid crystal display commonly used of Figure 20 A with respect to the relation of input gray grade, and Figure 21 B shows corresponding to light transmission rate in the liquid crystal display of second method of the employing present embodiment of Figure 20 B with respect to the relation of input gray grade.
Shown in Figure 21 A, in liquid crystal display commonly used, in the γ characteristic of watching angle 60 degree, trend towards providing the waveform different with the ideal curve shown in the A by the actual characteristic shown in the B.
In contrast, in second method, in the γ characteristic of watching angle 60 degree, trend towards providing the waveform that is similar to the ideal curve shown in the A by the actual characteristic shown in the B according to present embodiment.
Promptly, begin to become substantially peaked 4V by the white level value of the driving voltage of liquid crystal not being arranged on transmitance, and be arranged on the voltage that is higher than 4V, as 5V, and the structure liquid crystal panel makes the optical thickness of corresponding pixel cell with respect to the predetermined wavelength attenuation, has obtained the improved advantage of viewing angle characteristic of intermediate grey scales.
Notice that in the present embodiment, compare with display device commonly used, the driving voltage of white level (applying voltage) exceeds 25%, and the attenuation of optical unit thickness, promptly be about original 86%, but the present invention is not limited to this.Various aspects all are fine.In addition, have low viscous material as liquid crystal material by further use, response speed of liquid crystal accelerates.By these being applied to above-mentioned second embodiment, can improve the viewing angle characteristic.
Below third party's method will be described, third party's method is bright by changing/the dark time recently the drive surface plate so that improve the viewing angle characteristic.
Basically, to have adopted and provided bright/dark time ratio be 1: 2 driving method to third party's method.
For example shown in Figure 22, in this case, the line of vertical direction (V) is not going sequential access, but to bright line and concealed wire alternate access.Adopted a kind of dark data to become the access method of 2 times of bright data.
For example, in V line number is 768 situation, thereby when drive panel make bright/when dark time ratio becomes 1: 2, the drive controlling below having carried out.Notice that in the following description, the number of line is represented by the label that adds behind the # mark.
At first, line # 1 is accessed as bright data, line #513 is accessed as dark data subsequently, line # 2 is accessed as bright data subsequently, line #514 is accessed as dark data subsequently, and order repeats thereafter, and line # 256 is accessed as bright data, line #768 (last column) is accessed as dark data subsequently, and line #257 is accessed as bright data subsequently.
Line is accessed with said sequence usually, and line # 1 is accessed as dark data then, and line #258 is accessed as bright data subsequently, and line # 2 is accessed as dark data subsequently, and order repeats thereafter.
By above-mentioned driving method, bright/dark time ratio can be made as 1: 2 but not drive liquid crystal panel in 1: 1.
Figure 23 A shows in the liquid crystal display commonly used light transmission rate with respect to the relation of input gray grade, and Figure 23 B shows in the liquid crystal display of the third party's method that adopts present embodiment light transmission rate with respect to the relation of input gray grade.
Shown in Figure 23 A, in liquid crystal display commonly used, in the γ characteristic of watching angle 60 degree, trend towards providing the waveform different with the ideal curve shown in the A by the actual characteristic shown in the B.
In contrast, in third party's method, in the γ characteristic of watching angle 60 degree, trend towards providing the waveform that is similar to the ideal curve shown in (approaching) A by the actual characteristic shown in the B according to present embodiment.
That is, thus make bright/dark time ratio become 1: 2, obtain the improved advantage of viewing angle characteristic of intermediate grey scales by driving liquid crystal panel.In addition, this is than being not limited to 1: 2.Bright by changing/dark time ratio, especially make bright/dark than in dark ratio change drive liquid crystal panel greatly, can improve the viewing angle characteristic of intermediate grey scales.
Illustrated that more than thereby employing first to third party's method makes bright/dark time ratio become 1: 2 example as method for optimizing to drive liquid crystal panel.
Can also adopt these methods with array mode.For example, can also adopt cubic method or the 5th method, wherein cubic method has made up second method (white level is arranged on 5V and makes the method for optical unit thickness attenuation) and third party's method (changing the method for bright/dark time ratio), and the 5th method has made up the so-called spatial sub pixel (area ratio as be 2: 1) and second method.
Figure 24 A shows in the liquid crystal display commonly used light transmission rate with respect to the relation of input gray grade, Figure 24 B shows in the liquid crystal display that adopts second method light transmission rate with respect to the relation of input gray grade, and Figure 24 C shows in the liquid crystal display that adopts the cubic method that has made up second method and third party's method light transmission rate with respect to the relation of input gray grade.
Shown in Figure 24 A, as previously mentioned, in liquid crystal display commonly used, in the γ characteristic of watching angle 60 degree, trend towards providing the waveform different with the ideal curve shown in the A by the actual characteristic shown in the B.
In contrast, shown in Figure 24 B, in second method of present embodiment, in the γ characteristic of watching angle 60 degree, trend towards providing the waveform that is similar to the ideal curve shown in the A by the actual characteristic shown in the B.
In addition, shown in Figure 24 C, in the cubic method of present embodiment, compare, in the γ characteristic of watching angle 60 degree, trend towards providing the waveform that further is similar to the ideal curve shown in the A by the actual characteristic shown in the B with second method.
Therefore, even when adopting cubic method, still obtained the improved advantage of viewing angle characteristic of intermediate grey scales.
Figure 25 A show with the corresponding liquid crystal display of spatial sub processes pixel commonly used in light transmission rate with respect to the relation of input gray grade, Figure 25 B shows in the liquid crystal display of the 5th method that adopts second method that made up present embodiment and spatial sub processes pixel light transmission rate with respect to the relation of input gray grade.
Shown in Figure 25 A, as previously mentioned, in liquid crystal display commonly used, in the γ characteristic of watching angle 60 degree, trend towards providing the waveform different with the ideal curve shown in the A by the actual characteristic shown in the B.
In contrast, shown in Figure 25 B, in the 5th method, in the γ characteristic of watching angle 60 degree, trend towards providing the waveform that is similar to the ideal curve shown in the A by the actual characteristic shown in the B according to present embodiment.
Therefore, even when the 5th method of employing, still obtained the improved advantage of viewing angle characteristic of intermediate grey scales.
The driving voltage of liquid crystal cells in the bright dark time will be described below.
Figure 26 A shows in the liquid crystal display commonly used and is applied to the relation of the voltage characteristic waveform of liquid crystal cells with respect to input in the bright dark time, Figure 26 B shows in the liquid crystal display of second method that adopts present embodiment and is applied to the relation of the voltage characteristic waveform of liquid crystal cells with respect to input in the bright dark time, and Figure 26 C shows in the liquid crystal display that adopts the cubic method that has made up second method and third party's method and is applied to the relation of the voltage characteristic waveform of liquid crystal cells with respect to input in the bright dark time.
In each figure, be applied to the voltage waveform of liquid crystal cells by the curve representation shown in the VW in the bright time, be applied to the voltage waveform of liquid crystal cells in the dark time by the curve representation shown in the VB.
As shown in the figure, in the liquid crystal display of the method that adopts present embodiment, the expression scope of black level broadens, thereby can improve the viewing angle characteristic of intermediate grey scales effectively.
Figure 27 A show with the corresponding liquid crystal display commonly used of spatial sub processes pixel in be applied to liquid crystal cells in the bright dark time the voltage characteristic waveform with respect to the relation of input, Figure 27 B shows in the liquid crystal display of the 5th method that adopts second method that made up present embodiment and spatial sub processes pixel and is applied to the relation of the voltage characteristic waveform of liquid crystal cells with respect to input in the bright dark time.
In each figure, be applied to the voltage waveform of liquid crystal cells by the curve representation shown in the VW in the bright time, be applied to the voltage waveform of liquid crystal cells in the dark time by the curve representation shown in the VB.
As shown in the figure, in the liquid crystal display of the method that adopts present embodiment, the expression scope of black level broadens, thereby can improve the viewing angle characteristic of intermediate grey scales effectively.
In the liquid crystal display of first to the 5th method that adopts present embodiment, apply voltage VW and secretly apply voltage VB for each switches in bright shown in Figure 26 A to Figure 26 C and Figure 27 A and Figure 27 B, and these voltages are offered the so-called Source drive that is positioned at the liquid crystal panel prime.
Ios dhcp sample configuration IOS DHCP corresponding to the liquid crystal display of these methods will be described below.
Figure 28 shows first example of configuration of the liquid crystal display (image display) of the driving method that can use present embodiment.
First γ characteristic conservator 411 is for example with the form preservation of look-up table and the characteristic voltage γ pattern of the bright voltage VW of the corresponding setting of above γ characteristic.
Second γ characteristic conservator 412 is for example with the form preservation of look-up table and the characteristic voltage γ pattern of the dark voltage VB of the corresponding setting of above γ characteristic.
γ change-over switch 413 is each output data of switching first γ characteristic conservator 411 and second γ characteristic conservator 412, and optionally the signal identical with the Source drive signal is outputed to Source drive 43.
Adopt above driving method for this equipment 40, thereby improved gray scale performance.
Figure 29 shows second example of configuration of the liquid crystal display of the driving method that can use present embodiment.
This liquid crystal display 40A has reference voltage generator 42A, Source drive 43 and display panel 44.
The difference of the equipment 40A of Figure 29 and the equipment of Figure 28 is that the function of γ switch is endowed reference voltage generator 42A, and raw data is imported into Source drive 43.
First γ characteristic conservator 421 is for example with the form preservation of look-up table and the characteristic voltage γ pattern of the bright time of the corresponding setting of above γ characteristic.
Second γ characteristic conservator 422 is for example with the form preservation of look-up table and the characteristic voltage γ pattern of the dark time of the corresponding setting of above γ characteristic.
γ change-over switch 423 is each output data of switching first γ characteristic conservator 421 and second γ characteristic conservator 422, and optionally exports the signal identical with reference voltage to Source drive 43.
40A adopts above driving method for this equipment, thereby has improved gray scale performance.
Figure 30 shows the 3rd example of configuration of the liquid crystal display of the driving method that can use present embodiment.
This liquid crystal display 40B has the γ switch 41 of Figure 28 and has the reference voltage generator 42A of the switching function of Figure 29.
Therefore, omit explanation here to the basic function of these assemblies.
Figure 31 A shows data-switching γ pattern PVW and the PVB that preserves in first γ characteristic conservator 411 of γ switch 410 and second the γ characteristic conservator 412, Figure 31 B shows data-switching γ pattern PVW and the PVB that preserves in first γ characteristic conservator 421 of reference voltage generator 42A and second the γ characteristic conservator 422, and Figure 31 C shows output (liquid crystal applied voltages) characteristic of Source drive 43 with respect to the input data.
In the equipment 40B of Figure 30, Source drive 43 will for each γ pattern that provides from γ switch 410 selectivity with compare from the γ pattern that reference voltage generator 42A selectivity provides for each, with bright voltage VW and the dark voltage VB of generation shown in Figure 31 C, and provide it to display panel 44.
40B adopts above method for this equipment, thereby has improved gray scale performance.
Figure 32 shows the 4th example of configuration of the liquid crystal display of the driving method that can use present embodiment.
It is different that this liquid crystal display 40C and the difference of the equipment 40B of Figure 30 are to carry out the configuration that the γ of R, G and B proofreaies and correct.The basic function of the γ switch 410C of data converter 41C is identical.In addition, reference voltage generator 42A has the configuration identical with the equipment 40B of Figure 30.
Therefore, omit explanation here to the basic function of these assemblies.
Figure 33 A show preserve among first γ characteristic conservator 411C of γ switch 410C and second the γ characteristic conservator 412C with R, G and B corresponding data-switching γ pattern PVW and PVB, Figure 33 B shows data-switching γ pattern PVW and the PVB that preserves in first γ characteristic conservator 421 of reference voltage generator 42A and second the γ characteristic conservator 422, and Figure 33 C shows and R, G and the corresponding Source drive 43 of B output (liquid crystal applied voltages) characteristic with respect to the input data.
In the equipment 40C of Figure 33, Source drive 43 will provide for each γ switch 410C selectivity from data converter 41C with R, G and the corresponding γ pattern of B with compare from the γ pattern that reference voltage generator 42A selectivity provides for each, with bright voltage VW and the dark voltage VB of generation shown in Figure 33 C, and provide it to display panel 44.
40C adopts above method for this equipment, thereby has improved gray scale performance.
Figure 34 shows the 5th example of configuration of the liquid crystal display of the driving method that can use present embodiment.
The difference of the equipment 40B of this liquid crystal display 40D and Figure 30 is and the corresponding configuration of sub-pixel conversion process, that is, and and with respect to the parallel deployment of input data sub-pixel 1 system and sub-pixel 2 systems.
Identical among the function of assembly and Figure 30, thus explanation omitted here to the basic function of these assemblies.
Figure 35 A shows data-switching γ pattern PVW1 and the PVB1 that preserves in first γ characteristic conservator 411 of γ switch 410-1 and second the γ characteristic conservator 412, Figure 35 B shows data-switching γ pattern PVW2 and the PVB2 that preserves in first γ characteristic conservator 411 of γ switch 410-2 and second the γ characteristic conservator 412, Figure 35 C shows data-switching γ pattern PVW1 and the PVB1 that preserves in first γ characteristic conservator 421 of reference voltage generator 42A-1 and second the γ characteristic conservator 422, Figure 35 D shows data-switching γ pattern PVW2 and the PVB2 that preserves in first γ characteristic conservator 421 of reference voltage generator 42A-2 and second the γ characteristic conservator 422, and Figure 35 E shows output (liquid crystal applied voltages) characteristic of Source drive 43 with respect to the input data.
40D adopts above method for this equipment, thereby has improved gray scale performance.
Figure 36 shows the 6th example of configuration of the liquid crystal display of the driving method that can use present embodiment.
It is different that this liquid crystal display 40E and the difference of the equipment 40D of Figure 34 are to carry out the configuration that the γ of R, G and B proofreaies and correct.Identical among remainder and the equipment 40D of configuration.
Therefore, omit explanation here to the basic function of these assemblies.
Figure 37 A shows data-switching γ pattern PVW1 and the PVB1 that preserves in first γ characteristic conservator 411 of γ switch 410-1 and second the γ characteristic conservator 412, Figure 37 B shows data-switching γ pattern PVW2 and the PVB2 that preserves in first γ characteristic conservator 411 of γ switch 410-2 and second the γ characteristic conservator 412, Figure 37 C shows data-switching γ pattern PVW1 and the PVB1 that preserves in first γ characteristic conservator 421 of reference voltage generator 42A-1 and second the γ characteristic conservator 422, Figure 37 D shows data-switching γ pattern PVW2 and the PVB2 that preserves in first γ characteristic conservator 421 of reference voltage generator 42A-2 and second the γ characteristic conservator 422, and Figure 37 E and Figure 37 F show Source drive 43 with respect to input data and R, the corresponding output of G and B (liquid crystal applied voltages) characteristic.
40E adopts above method for this equipment, thereby has improved gray scale performance.
Figure 38 shows the 7th example of configuration of the liquid crystal display of the driving method that can use present embodiment.
The difference of the equipment 40D of this liquid crystal display 40F and Figure 34 is in the γ of data converter 41E switch 410E, first and second γ conservators of sub-pixel 1 and first and second γ conservators of sub-pixel 2 are parallel deployment, and optionally switch with output signal, and signal is output to Source drive 43 then in the execution correction of RGB γ correcting unit 414 places by a γ switch 413F.
Therefore, the equipment 40F of Figure 38 can deal with the sub-pixel modulation treatment by a Source drive 43 and reference voltage generator 42A only are provided.
40F adopts above driving method for this equipment, thereby has improved gray scale performance.
Practicality
It is middle that image display of the present invention and method for displaying image can utilize a plurality of pixels to show Gray level, and can improve the viewing angle characteristic simultaneously, thus can be applied to direct viewing type liquid Crystal display device etc.
Claims
(according to the modification of the 19th of treaty)
On Dec 26th, 2005, international affairs bureau accepted: the claim 1-16 with revisal replaces the claim 1-22 that submits when applying for.
1. one kind can be utilized the intermediate grey scales of being represented described incoming video signal by an a plurality of effective voltage that are listed as that forms with the demonstration speed that is higher than incoming video signal, and can carry out the image display of gray level display according to described incoming video signal, comprise:
The display that comprises liquid crystal pixel cells, the described liquid crystal pixel cells utilization gray level consistent with driving voltage come display image, and
Be used to generate the drive part with first voltage and the corresponding driving voltage of second voltage, described first voltage is corresponding to the level brighter than described incoming video signal, and described second voltage is corresponding to the level darker than described incoming video signal, wherein
Described second voltage is set to be lower than the threshold voltage according of liquid crystal cells.
2. image display as claimed in claim 1 also comprises device is set, and is used for according to the intermediate grey scales that should show first characteristic value and second characteristic value being set.
3. image display as claimed in claim 1, wherein the gray level expressing device utilizes described row to represent the gray level of the vision signal shown by former colour brightness component list.
4. image display as claimed in claim 1, gray level expressing device conversion gray level wherein, thus make in first characteristic value or second characteristic value any become maximum characteristic value or minimum characteristics value.
5. one kind can be utilized the intermediate grey scales of being represented described incoming video signal by an a plurality of effective voltage that are listed as that forms with the demonstration speed that is higher than incoming video signal, and can carry out the image display of gray level display according to described incoming video signal, comprise:
The display that comprises liquid crystal pixel cells, the described liquid crystal pixel cells utilization gray level consistent with driving voltage come display image, and
Be used to generate the drive part with first voltage and the corresponding driving voltage of second voltage, described first voltage is corresponding to the level brighter than described incoming video signal, and described second voltage is corresponding to the level darker than described incoming video signal, wherein
The maximal value of first characteristic is set as the characteristic value that is higher than liquid crystal cells and begins to become basic voltage when maximum.
6. image display as claimed in claim 5, wherein the optical thickness of each pixel cell is set as thinner than each the predetermined wavelength in the three primary colors that show.
7. one kind can be utilized the intermediate grey scales of being represented described incoming video signal by an a plurality of effective voltage that are listed as that forms with the demonstration speed that is higher than incoming video signal, and can carry out the image display of gray level display according to described incoming video signal, comprise:
The display that comprises liquid crystal pixel cells, the described liquid crystal pixel cells utilization gray level consistent with driving voltage come display image, wherein
Drive described display in the demonstration time ratio that changes bright level and black level, the described incoming video signal of wherein said bright level ratio is bright, and described black level is darker than described incoming video signal.
8. image display as claimed in claim 7 wherein drives described display device, makes the demonstration time ratio of described black level become big in the time ratio of bright level and black level.
9. image display as claimed in claim 8 also comprises:
Be used to generate the drive part with first voltage and the corresponding driving voltage of second voltage, described first voltage is corresponding to described bright level, and described second voltage is corresponding to described black level, wherein
The maximal value of described first voltage is set as the characteristic value that is higher than liquid crystal cells and begins to become basic voltage when maximum.
10. one kind has the image display that can carry out the display of gray level display according to incoming video signal, comprising:
The grey level transition device is used for the grey level transition of incoming video signal is the characteristic value with respect to the pixel of the image two-dimensional arrangements that will show; With
The gray level expressing device is used to utilize the intermediate grey scales of being represented described incoming video signal by a plurality of the field row that form with the demonstration speed that is higher than incoming video signal, wherein
Described grey level transition device conversion gray level is so that comprise that in a plurality of pixels of expression intermediate grey scales at least one pixel that is converted into first characteristic value and at least one are converted into the pixel of second characteristic value, wherein first characteristic value is by obtaining on the gray level that the positive correction value is added to described incoming video signal, second characteristic value obtains by adding the negative correction value
Described gray level expressing device is represented gray level and is converted into the field of the 4th characteristic value so that comprise at least one field that is converted into the 3rd characteristic value with at least one, wherein the 3rd characteristic value is by obtaining on the gray level that the positive correction value is added to described incoming video signal, the 4th characteristic value obtains by adding the negative correction value, and
Control described grey level transition device and described gray level expressing device to come display gray scale based on incoming video signal.
11. image display as claimed in claim 10, when described incoming video signal comprises moving image, control described grey level transition device and change gray level, and when described incoming video signal is formed by rest image, control described gray level expressing device utilization field and be listed as and represent intermediate grey scales.
12. image display as claimed in claim 10, wherein
Described equipment also comprises reference voltage generator, the 3rd characteristic value and the corresponding reference voltage of the 4th characteristic value in its generation and the described gray level expressing device, and
Described display drives corresponding to the reference voltage that described grey level transition device carries out the field that first and second characteristic values after the grey level transition are generated with described reference voltage generator.
13. the intermediate grey scales that can utilize the effective voltage that is listed as by a plurality of the fields that form with the demonstration speed that is higher than incoming video signal to represent described incoming video signal, and can carry out the method for displaying image of gray level display according to described incoming video signal, comprise:
Generate the step with first voltage and the corresponding driving voltage of second voltage, described first voltage is corresponding to the level brighter than described incoming video signal, and described second voltage is corresponding to the level darker than described incoming video signal, and
The driving voltage that is generated is applied to the step of liquid crystal cells, wherein
Described second voltage is set to be lower than the threshold voltage according of liquid crystal cells.
14. the intermediate grey scales that can utilize the effective voltage that is listed as by a plurality of the fields that form with the demonstration speed that is higher than incoming video signal to represent described incoming video signal, and can carry out the method for displaying image of gray level display according to described incoming video signal, comprise:
Generate the step with first voltage and the corresponding driving voltage of second voltage, described first voltage is corresponding to the level brighter than described incoming video signal, and described second voltage is corresponding to the level darker than described incoming video signal, and
The driving voltage that is generated is applied to the step of liquid crystal cells, wherein
Described first voltage is set as the characteristic value that is higher than liquid crystal cells and begins to become basic voltage when maximum.
15. the intermediate grey scales that can utilize the effective voltage that is listed as by a plurality of the fields that form with the demonstration speed that is higher than incoming video signal to represent described incoming video signal, and can carry out the method for displaying image of gray level display according to described incoming video signal, may further comprise the steps:
In the demonstration time ratio that changes bright level and black level, drive the display that comprises liquid crystal cells, the wherein said liquid crystal cells utilization gray level consistent with driving voltage come display image, and the described incoming video signal of described bright level ratio is bright, and described black level is darker than described incoming video signal.
16. the method for displaying image that can carry out gray level display according to incoming video signal comprises:
The grey level transition step, this step is the characteristic value with respect to the pixel of the image two-dimensional arrangements that should show with the grey level transition of incoming video signal; And
The gray level expressing step, this step utilization is listed as the intermediate grey scales of representing described incoming video signal by a plurality of the fields that form with the demonstration speed that is higher than described vision signal, wherein
Described grey level transition step conversion gray level is so that comprise that in a plurality of pixels of expression intermediate grey scales at least one pixel that is converted into first characteristic value and at least one are converted into the pixel of second characteristic value, wherein first characteristic value is by obtaining on the gray level that the positive correction value is added to described incoming video signal, second characteristic value obtains by adding the negative correction value
Described gray level expressing step is represented gray level and is converted into the field of the 4th characteristic value so that comprise at least one field that is converted into the 3rd characteristic value with at least one, wherein the 3rd characteristic value is by obtaining on the gray level that the positive correction value is added to described incoming video signal, the 4th characteristic value obtains by adding the negative correction value, and
Control described grey level transition step and described gray level expressing step to come display gray scale based on incoming video signal.
Claims (22)
1. image display that can carry out gray level display according to incoming video signal comprises:
The grey level transition device is used for the grey level transition of incoming video signal is the characteristic value with respect to the pixel of the image two-dimensional arrangements that should show, wherein
Described grey level transition device conversion gray level is so that comprise that in a plurality of pixels of expression intermediate grey scales at least one pixel that is converted into first characteristic value and at least one are converted into the pixel of second characteristic value, wherein first characteristic value is by obtaining on the gray level that the positive correction value is added to described incoming video signal, and second characteristic value obtains by adding the negative correction value.
2. image display as claimed in claim 1 comprises that also corrected value is provided with device, is used for according to the intermediate grey scales that should represent described corrected value being set.
3. image display as claimed in claim 1, wherein said grey level transition device is changed the gray level of the vision signal of being shown by former colour brightness component list.
4. image display as claimed in claim 1, wherein said grey level transition device conversion gray level, thus make first characteristic value that adds positive correction value or negative correction value or any in second characteristic value become maximum characteristic value or minimum characteristics value.
5. image display that can carry out gray level display according to incoming video signal comprises:
The gray level expressing device is used to utilize the intermediate grey scales of being represented described incoming video signal by a plurality of the field row that form, wherein
Described gray level expressing device is represented gray level and is converted into the field of second characteristic value so that comprise at least one field that is converted into first characteristic value with at least one, wherein first characteristic value is by obtaining on the gray level that the positive correction value is added to described incoming video signal, and second characteristic value obtains by adding the negative correction value.
6. image display as claimed in claim 5 also comprises device is set, and is used for according to the intermediate grey scales that should show described first characteristic value and described second characteristic value being set.
7. image display as claimed in claim 5, wherein said gray level expressing device utilize described row to represent the intermediate grey scales of the vision signal shown by former colour brightness component list.
8. image display as claimed in claim 5, thus wherein said gray level expressing device is represented gray level and is made in described first characteristic value or described second characteristic value any become maximum characteristic value or minimum characteristics value.
9. image display that can carry out gray level display according to incoming video signal comprises:
The grey level transition device is used for the grey level transition of incoming video signal is the characteristic value with respect to the pixel of the image two-dimensional arrangements that should show; With
The gray level expressing device is used to utilize the intermediate grey scales of being represented described incoming video signal by a plurality of the field row that form, wherein
Described grey level transition device conversion gray level is so that comprise that in a plurality of pixels of expression intermediate grey scales at least one pixel that is converted into first characteristic value and at least one are converted into the pixel of second characteristic value, wherein first characteristic value is by obtaining on the gray level that the positive correction value is added to described incoming video signal, second characteristic value obtains by adding the negative correction value, and
Described gray level expressing device is represented gray level and is converted into the field of second characteristic value so that comprise at least one field that is converted into first characteristic value with at least one, wherein first characteristic value is by obtaining on the gray level that the positive correction value is added to described incoming video signal, and second characteristic value obtains by adding the negative correction value.
10. image display as claimed in claim 9, also comprise controller, be used for when described incoming video signal comprises moving image, controlling described grey level transition device and change gray level, and when described incoming video signal is formed by rest image, control described gray level expressing device utilization field and be listed as and represent intermediate grey scales.
11. one kind can be utilized by a plurality of the field row that form and represent the intermediate grey scales of incoming video signal and carry out the image display of gray level display according to incoming video signal, comprising:
The display that comprises liquid crystal pixel cells, the described liquid crystal pixel cells utilization gray level consistent with driving voltage come display image, and
Be used to generate the drive part corresponding to the driving voltage of effective voltage, described effective voltage comprises corresponding to first voltage of bright level with corresponding to second voltage of black level, wherein
Described second voltage is set to be lower than the threshold voltage according of liquid crystal cells.
12. one kind can be utilized by a plurality of the field row that form and represent the intermediate grey scales of incoming video signal and carry out the image display of gray level display according to incoming video signal, comprising:
The display that comprises liquid crystal pixel cells, the described liquid crystal pixel cells utilization gray level consistent with driving voltage come display image, and
Be used to generate the drive part corresponding to the driving voltage of effective voltage, described effective voltage comprises corresponding to first voltage of bright level with corresponding to second voltage of black level, wherein
The characteristic value that described first voltage is set to be higher than liquid crystal cells begins to become basic voltage when maximum.
13. image display as claimed in claim 12, wherein the optical thickness of each pixel cell is provided with according to described first magnitude of voltage.
14. one kind can be utilized by a plurality of the field row that form and represent the intermediate grey scales of incoming video signal and carry out the image display of gray level display according to incoming video signal, comprising:
The display that comprises liquid crystal pixel cells, the described liquid crystal pixel cells utilization gray level consistent with driving voltage come display image, wherein
When changing bright/dark time ratio, drive described display.
15. image display as claimed in claim 14 wherein drives described display, make described bright/dark than in dark ratio become greatly.
16. image display as claimed in claim 15, wherein
Described equipment also comprises the drive part that is used to generate corresponding to the driving voltage of effective voltage, and described effective voltage comprises corresponding to first voltage of bright level with corresponding to second voltage of black level, and
The characteristic value that described first voltage is set to be higher than liquid crystal cells begins to become basic voltage when maximum.
17. the method for displaying image that can carry out gray level display according to incoming video signal comprises:
The grey level transition step, this step is the characteristic value with respect to the pixel of the image two-dimensional arrangements that should show with the grey level transition of incoming video signal, wherein
Described grey level transition step conversion gray level is so that comprise that in a plurality of pixels of expression intermediate grey scales at least one pixel that is converted into first characteristic value and at least one are converted into the pixel of second characteristic value, wherein first characteristic value is by obtaining on the gray level that the positive correction value is added to described incoming video signal, and second characteristic value obtains by adding the negative correction value.
18. the method for displaying image that can carry out gray level display according to incoming video signal comprises:
The gray level expressing step, this step utilization is listed as the intermediate grey scales of representing described incoming video signal by a plurality of the fields that form, wherein
Described gray level expressing step is represented gray level and is converted into the field of second characteristic value so that comprise at least one field that is converted into first characteristic value with at least one, wherein first characteristic value is by obtaining on the gray level that the positive correction value is added to described incoming video signal, and second characteristic value obtains by adding the negative correction value.
19. the method for displaying image that can carry out gray level display according to incoming video signal comprises:
The grey level transition step, this step is the characteristic value with respect to the pixel of the image two-dimensional arrangements that should show with the grey level transition of incoming video signal; With
The gray level expressing step, this step utilization is listed as the intermediate grey scales of representing described incoming video signal by a plurality of the fields that form, wherein
Described grey level transition step conversion gray level is so that comprise that in a plurality of pixels of expression intermediate grey scales at least one pixel that is converted into first characteristic value and at least one are converted into the pixel of second characteristic value, wherein first characteristic value is by obtaining on the gray level that the positive correction value is added to described incoming video signal, second characteristic value obtains by adding the negative correction value, and
Described gray level expressing step is represented gray level and is converted into the field of second characteristic value so that comprise at least one field that is converted into first characteristic value with at least one, wherein first characteristic value is by obtaining on the gray level that the positive correction value is added to described incoming video signal, and second characteristic value obtains by adding the negative correction value.
20. one kind can be utilized by a plurality of the field row that form and represent the intermediate grey scales of incoming video signal and carry out the method for displaying image of gray level display according to incoming video signal, comprising:
Generation is corresponding to the step of the driving voltage of effective voltage, and described effective voltage comprises corresponding to first voltage of bright level with corresponding to second voltage of black level; And
The driving voltage that is generated is applied to the step of liquid crystal cells, and wherein said second voltage is set to be lower than the threshold voltage according of liquid crystal cells.
21. one kind can be utilized by a plurality of the field row that form and represent the intermediate grey scales of incoming video signal and carry out the method for displaying image of gray level display according to incoming video signal, comprising:
Generation is corresponding to the step of the driving voltage of effective voltage, and described effective voltage comprises corresponding to first voltage of bright level with corresponding to second voltage of black level; And
The driving voltage that is generated is applied to the step of liquid crystal cells, wherein
The characteristic value that described first voltage is set to be higher than liquid crystal cells begins to become basic voltage when maximum.
22. one kind can be utilized by a plurality of the field row that form and represent the intermediate grey scales of incoming video signal and carry out the method for displaying image of gray level display according to incoming video signal, comprising:
Drive the display that comprises liquid crystal cells when changing bright/dark time ratio, the described liquid crystal cells utilization gray level consistent with driving voltage come display image.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP210347/2004 | 2004-07-16 | ||
| JP2004210347 | 2004-07-16 | ||
| JP166014/2005 | 2005-06-06 |
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| CN1842839A true CN1842839A (en) | 2006-10-04 |
| CN100437736C CN100437736C (en) | 2008-11-26 |
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| CNB2005800009109A Expired - Fee Related CN100437736C (en) | 2004-07-16 | 2005-07-15 | Image display device and image display method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101765874A (en) * | 2008-05-28 | 2010-06-30 | 松下电器产业株式会社 | Display device, and manufacturing method and control method thereof |
| CN107851414A (en) * | 2015-07-24 | 2018-03-27 | 夏普株式会社 | Pixel layout and display |
| WO2019119557A1 (en) * | 2017-12-18 | 2019-06-27 | 惠科股份有限公司 | Driving method and driving device for display panel, and display device |
| CN112581906A (en) * | 2019-09-27 | 2021-03-30 | 天马日本株式会社 | Display device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4794409A (en) * | 1987-12-03 | 1988-12-27 | Hewlett-Packard Company | Ink jet pen having improved ink storage and distribution capabilities |
| JP3202450B2 (en) * | 1993-10-20 | 2001-08-27 | 日本電気株式会社 | Liquid crystal display |
| JPH07294881A (en) * | 1994-04-20 | 1995-11-10 | Kodo Eizo Gijutsu Kenkyusho:Kk | Liquid crystal display device |
| JPH0990910A (en) * | 1995-09-26 | 1997-04-04 | Matsushita Electric Ind Co Ltd | Liquid crystal display device and drive method therefor |
| US6801220B2 (en) * | 2001-01-26 | 2004-10-05 | International Business Machines Corporation | Method and apparatus for adjusting subpixel intensity values based upon luminance characteristics of the subpixels for improved viewing angle characteristics of liquid crystal displays |
-
2005
- 2005-07-15 CN CNB2005800009109A patent/CN100437736C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101765874A (en) * | 2008-05-28 | 2010-06-30 | 松下电器产业株式会社 | Display device, and manufacturing method and control method thereof |
| CN101765874B (en) * | 2008-05-28 | 2014-09-10 | 松下电器产业株式会社 | Display device, and manufacturing method and control method thereof |
| CN107851414A (en) * | 2015-07-24 | 2018-03-27 | 夏普株式会社 | Pixel layout and display |
| WO2019119557A1 (en) * | 2017-12-18 | 2019-06-27 | 惠科股份有限公司 | Driving method and driving device for display panel, and display device |
| CN112581906A (en) * | 2019-09-27 | 2021-03-30 | 天马日本株式会社 | Display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100437736C (en) | 2008-11-26 |
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