CN100511411C - Image display device and driving device of image display device - Google Patents

Abstract

A noise adding circuit adds noise data to video data, and a circuit rounds a less significant bit, so as to output video data of 6 bits from 8 bit input data for example. The video data of 6 bits is stored in a frame memory until a further next frame, and a previous frame grayscale correction circuit corrects video data of a previous frame as required so that the video data of the previous frame approaches video data of a further previous frame. It then outputs thus corrected video data. Further, a modulation processing section corrects video data of a current frame so as to emphasize grayscale transition from the video data of the previous frame which is outputted by the previous frame grayscale correction circuit. Thus, it is possible to realize a driving device of an image display device, which can improve a response speed of pixels and has a simple arrangement, without apparently deteriorating display quality of an image displayed in the pixels.

Description

The drive unit of image display and this image display

The application is the applying date: 2004.04.02, application number are 200410038753.8, and name is called the dividing an application of application of " drive unit of image display, program and storage medium thereof, image display and television receiver ".

Technical field

In general, the present invention relates to drive unit, program and/or its storage medium, image display and/or the television receiver of image display.

Background technology

The low power consumption liquid crystal display device still all is widely used on fixed equipment at mobile device.As this liquid crystal display, there is a kind of liquid crystal display, wherein: liquid crystal display can be delivered to the data-signal driving circuit to the gray scale digital signal of respective pixel point; According to the size of digital signal value, the data-signal driving circuit converts thereof into voltage signal, and then converts the data scanning line to, thus the gray scale of control pixel.

In the liquid crystal display, with the corresponding voltage data of each pixel on the display panel be to transmit with digital signal.Therefore, when the bit wide of amplifying gradation data numerical value when obtaining outstanding display gray scale, the circuit size of the processing digital signal that is used for or the calculated amount of circuit can increase.On the other hand, adopt to eliminate than low order and dwindle bit wide, will reduce circuit size or reduce calculated amount, on display panel, false contouring figure just appears in the image demonstration, so that display quality seriously descends.

At this, in order to realize to improve the image display of display quality, adopt a ball bearing made using to prevent the generation of false contouring figure, Japan's uncensored patent disclosure 337667/2001 (Tokukai2001-337667) (open date: Dec 7 calendar year 2001) disclosed a kind of technology: behind superposition noise on the digital signal, just excised than low order.Specifically, when incoming video signal is n position (n is an a natural number) digital signal, the n position of the 516 pairs of digital signals in first segment signal processing section shown in Figure 26 is carried out γ and is revised, and converts digital signal to m position digital signal (m〉n, m is a natural number); Then, noise signal is added in the second segment signal processing section 517 on the m position digital signal by 516 outputs of first segment signal processing section; Next step, low effectively (m-Q) position (Q≤n:Q is a natural number) of excision, and remaining Q position digital signal outputed to data-signal scan drive circuit 514 on the display panel; Then, data-signal scan drive circuit 514 produces output, by the data-signal sweep trace produce one with the corresponding magnitude of voltage of Q position digital signal from 517 outputs of the second segment signal processing section, thereby control the gray scale of pixel.

In this design proposal, the bit wide (Q position) of the digital signal of exporting from the second segment signal processing section 517 is provided with littler than the bit wides (m position) of 516 outputs from first segment signal processing section.Like this, its circuit structure is compared with data-signal sweep circuit 514 and is wanted simple.Therefore, utilize first piece of digital processing section 516 to come processing digital signal output to become possibility.

In addition, the second segment signal processing section 517 is added noise and is eliminated than low order.Thereby, be not only to only need to remove than low order, aspect display gray scale, each adjacent pixel all has a great difference.As a result, may realize a cover image display, adopt ball bearing made using to prevent the appearance of false contouring figure and improve display quality.

Compare with CRT (cathode-ray tube (CRT)) etc., it is slow that the response speed of liquid crystal display is wanted.Because grayscale transition can cause: under the normal frames frequency (60Hz), display device can not be finished response in qualification rewriting time (16.7 milliseconds).

Adopted a kind of method: adjust and the load driver signal, the variation of reinforcement from the previous frame gradation data to the present frame gradation data is (for example, referring to the uncensored patent disclosure 116743/2002 of Japan (Tokukai2002-116743) (open date: on April 19th, 2002)).

For example, grayvalue transition by previous frame FR (k-1) " rising " under the situation of present frame FR (k), being used for the voltage of remarked pixel point also can increase, to strengthen the gradation conversion from the previous frame gray-scale value to the present frame gray-scale value.More particularly, be used for the voltage of remarked pixel point, its magnitude of voltage is than (k) magnitude of voltage of represented present frame FR (k) wants big for i, j with video data D.

As a result, when grey scale change, the intensity level of pixel increases rapidly, and at short notice near the pairing video data D of present frame FR (k) (i, j, brightness level range k).In this case, (k) represented voltage is effect voltage to the video data D of present frame FR (k) for i, j.Like this, even response speed of liquid crystal is very slow, still might improve the response speed of LCD.

In addition, Jap.P. discloses 2650479 (date of patent: on September 3rd, 1997) set forth a cover display device, at this device: produce a printing opacity curve, perhaps dope a printing opacity curve according to acting on signal datas any pixel, at least 3 continuous field intensity, when the printing opacity curve departed from by a setting value or more many-valued definite desirable printing opacity curve, the data-signal of field intensity will be corrected continuously.

Specifically, as shown in figure 27, in display 501a, data input device 521 is stored in 522 li of field intensity storeies to the video data of pixel.Then, when the penetrability of reality and desirable error between penetrability during greater than pre-set threshold, data correction apparatus 523 is revised the video data of field intensity storer 522 according to field intensity storer 522.Then, data output device 524 is read the video data that was corrected in the field intensity storer 522 in order, drives pixel (not showing among the figure).

Summary of the invention

The second segment signal processing section of in the 2001-337667 of Tokukai, being set forth, display element must be detected and what grade gray scales can be shown, and must eliminate certain position and just can make figure place corresponding with gray-scale displayed, this has to again according to the width increase noise of eliminating the position.

The second segment signal processing section is arranged in display panel display element near, it is desirable to make by the display element of display panel can gray-scale displayed designated, and it is also designated to eliminate the width of position.In the 2002-1166743 of Tokukai, the conversion of gray scale is had to strengthen in the processing section that is used to strengthen gradation conversion, so reached desirable gray scale by the shown gray scale of pixel on the display panel.Simultaneously, it is desirable to the second segment signal processing section be arranged in display panel near so that can determine should be reinforced, and the suitable intensity of definite gradation conversion in order to reach what gradation conversion of desirable gray scale.

In addition, according to aforesaid convention structure, when the target gray scale was minimal gray or maximum gray scale, gradation conversion can not be reinforced fully.

For example, is by the gradation conversion of maximum gray scale to minimal gray by former frame to the gradation conversion of present frame, in this case, even when being used to strengthen the processing section of gradation conversion when strengthening gradation conversion, because gradation conversion is the gradation conversion from maximum gray scale to minimal gray, gradation conversion can not be carried out again.Therefore, it is very important fully to strengthen the response speed of pixel.

For the drive unit of realizing suppressing the obvious deterioration of display quality and adopting less circuit size and less calculated amount just can drive the image display of display element under high speed, the inventor studies in earnest.They find: before execution was used to strengthen the operation of gradation conversion, it was more desirable carrying out the operation that is used to add noise earlier.As a result, various concrete scheme of the present invention is designed.

An object of the present invention is to realize the drive unit of image processing apparatus, this equipment can improve the response speed of pixel, and quality simple in structure, that the pixel image shows does not have obvious distortion.

And another object of the present invention is to realize the drive unit of image processing apparatus, even when required grey scale change during to minimal gray, still can improve the response speed of pixel.

In order to realize this goal, the drive unit of image processing apparatus of the present invention comprises: an entry terminal equipment is used to receive a tone data of each pixel; A noise adding set is used for adding noise data being imported on the tone data of entry terminal equipment, and cast out specify bit wide than low order to produce the secondary tone data; The noise generation device is used to produce noise data, so that the noise data of any intensity is added on the tone data adjacent one another are, as to have the same color pixel; Memory storage is used for storage pixel and puts existing secondary tone data, and data are saved up to the new secondary tone data of input always just to be upgraded; And a means for correcting, be used to proofread and correct current secondary tone data, according to the previous secondary tone data that from memory storage, reads, simplify by of the tone transition of previous secondary tone data to the current color adjusting data.

In said structure, when a tone data of the current tone of each pixel is transfused to, the noise adding set adds noise data being imported on the tone data of entry terminal equipment, and casts out than low order, to produce the secondary tone data; The current secondary tone data of each pixel that is produced by the noise adding set is stored in the memory storage, upgrades up to have new secondary tone data to produce just next time; A means for correcting, be used to proofread and correct current secondary tone data, according to the previous secondary tone data that in memory storage, reads and from the current secondary tone data of noise adding set input, to strengthen from last one constantly tone data to the tone transition of the tone data of current time.

In this structure, by casting out than low order, the bit width that is kept at the secondary tone data in the memory storage is littler than the bit width of a tone data.Therefore, it is possible reducing the essential memory capacity of memory storage.In addition, the bit width of the tone data of being handled by the circuit (memory storage, a means for correcting or the like) that is positioned at after the signal adding set also is reduced, and this just makes and reduces these circuit sizes and reduce its calculated amount to become possibility.In addition, reduce the quantity of the lead be used for connecting these circuit and reduce and also become possibility by these lead occupation space.

In addition, the noise generation device produces noise data, so that the noise data of any intensity is added on the tone data adjacent one another are, as to have the same color pixel.This structure can not generate false contouring figure, and therefore, this is different from another kind of structure, in the sort of structure: when being clipped when producing the secondary tone data than low order of a tone data, false contouring figure can occur during with the pixel display image.

The result, although the bit wide of secondary tone data is littler than the bit wide of a tone data, but still can keep the display quality of the image that shows with pixel, in this case, display quality can not be different from the display quality based on a tone data image significantly.

In addition, No. one time means for correcting is strengthened the tone transition that was carved into current time from last a period of time, makes the response speed that improves pixel become possibility.At this moment, when a means for correcting was positioned at the next stage of noise adding set, noise data just was added on the data after having strengthened the tone transition.Therefore, perhaps tone data can be strengthened excessively, to such an extent as to the brightness of pixel is not to strengthen with achieving one's goal.As a result, a kind of possibility is just arranged, that is exactly: it is excessive that the excessive reinforcement of tone data may be used as brightness by the user of image display.

Another kind of situation is that perhaps the tone transition can occur strengthening inadequately, to such an extent as to the brightness of pixel is weakened with achieving one's goal.As a result, have only a kind of possibility, that is exactly: it is too dark that the reinforcement of tone data may be taken as brightness inadequately.Yet, according to aforesaid structure, a means for correcting is positioned at the next stage of noise adding set, make it possible to improve the response speed of pixel, can not cause strong or cross the appearance of weak brightness owing to the noise superposition, this situation be different from the situation that means for correcting is positioned at noise adding set previous stage.

As a result, can realize the drive unit of an image display, this equipment can improve the response speed of pixel and can reduce circuit size and reduce calculated amount, and the display quality of the image that not obvious deterioration shows with pixel.

In order to reach this target, the drive unit of image processing apparatus of the present invention comprises: the tone conversion equipment is used for a tone data indicated value of the current tone of each pixel is converted to the secondary tone data with γ characteristic bigger than the γ characteristic of a tone data; Memory storage is used to store current secondary tone data, upgrades up to have new secondary tone data to produce just next time; Means for correcting, be used to proofread and correct current secondary tone data, according to the previous secondary tone data that in memory storage, reads, to promote from last one constantly tone data to the tone transition of the tone data of current time, wherein, the secondary tone data that changes with the conversion of a tone data minimum may limit be set low limit height of the numerical range that can be described than secondary tone data.

In aforesaid structure, the secondary tone data that correction is current was carved into current time in order to strengthen the tone transition from last a period of time, was possible so improve the response speed of pixel.In addition, in the structure of Jie Shaoing, the tone conversion equipment converts a tone data to big γ characteristic secondary tone data in front.Further say, the secondary tone data that changes with the conversion of a tone data minimum may limit be set low limit height of the numerical range that can be described than secondary tone data.

Like this, when using image pixel based on the secondary tone data to demonstrate the pairing tone of secondary tone data, the tone that demonstrates has more low key tone than the situation of not carrying out the γ conversion.And, corresponding to the secondary tone data value of hanging down limit (black level) of a tone data, not the lower bound of secondary tone data value.Like this, means for correcting can use the secondary tone data value lower than the tone of the secondary tone data of front, and the secondary tone data of front is used for strengthening the tone transition.So, just might improve the response speed of pixel.

Characteristics for a more complete understanding of the present invention and advantage are with reference in conjunction with the accompanying drawings the detailed description of each exemplary embodiment subsequently.

Description of drawings

Fig. 1 has shown a case study on implementation of the present invention, is the calcspar of pith of the modulation-energized process link of an image display.

Fig. 2 is a block scheme, has represented the pith of an image display.

Fig. 3 is a circuit diagram, has represented the pixel example of structure of an image display.

Fig. 4 illustrated when the gray scale of pixel when x axle (gray scale) increases, the penetrability of pixel be how according to around brightness increase, this brightness is to represent with the form of percentage.

Fig. 5 illustrated when the gray scale of pixel when x axle (gray scale) increases, the penetrability of pixel is how to increase according to initial brightness, this brightness is to represent with the form of percentage.

Fig. 6 is a sequential chart, has represented the principle of work of modulation-energized process link.This sequential chart has been represented the intensity of brightness curve of a reality: when gray scale the past, two gradation data corresponding gray scale value carried out the transition to current gray level data corresponding gray scale value, intensity of brightness was a decay-upcurve.

Fig. 7 is a sequential chart, has represented the principle of work of modulation-energized process link.This sequential chart has been represented the intensity of brightness curve of a reality: when gray scale the past, two gradation data corresponding gray scale value carried out the transition to current gray level data corresponding gray scale value, intensity of brightness was a rising-die-away curve.

Fig. 8 has illustrated following relation between the two: (i) expression zone by the combination of former frame video data and the preceding second frame video data; (ii) zoning.

Fig. 9 has shown the content of tabling look-up, and this table is provided for modulation-energized process part.

Figure 10 has shown an alternative embodiment of the invention, is the calcspar of pith of the modulation-energized process link of an image display.

Figure 11 has shown an alternative embodiment of the invention, is the calcspar of pith of the modulation-energized process link of an image display.

Figure 12 has shown an alternative embodiment of the invention, is the content of tabling look-up, and this table is provided for modulation-energized process part.

Figure 13 has shown an alternative embodiment of the invention, is the calcspar of pith of the modulation-energized process link of an image display.

Figure 14 has shown an alternative embodiment of the invention, is the calcspar of pith of the modulation-energized process link of an image display.

Figure 15 has shown an alternative embodiment of the invention, is the calcspar of pith of the modulation-energized process link of an image display.

Figure 16 has illustrated the principle of work at the greyscale transformation circuit of modulation-energized process part, and has shown following relation between the two: (i) before carrying out gradation conversion, and the scope of numerical value; (ii) after carrying out gradation conversion, the scope of numerical value.

Figure 17 has illustrated the principle of work at modulation-energized process part γ change-over circuit, and has shown the γ characteristic after gradation conversion is carried out preceding and gradation conversion execution.

Figure 18 is a width of cloth curve map, has shown voltage-light transmission features that the liquid crystal lattice is used in the pixel array of image display.

Figure 19 has shown a comparative example.This is a width of cloth curve map, and following relation between the two has been described: (i) gray scale that is received by the data-signal scan drive circuit of image display; (ii) offer the voltage of pixel.

Figure 20 is a width of cloth curve map, and following relation between the two has been described: (i) according to aforesaid embodiment, and the gray scale that is received by the data-signal scan drive circuit of image display; (ii) offer the voltage of pixel.

The greyscale transformation circuit that partly provides in modulation-energized process and the computing of data-signal scan drive circuit have been provided Figure 21, and following relation between the two has been described: (i) before carrying out gradation conversion, and the scope of numerical value; (ii) after carrying out gradation conversion, the scope of numerical value; (iii) offer the voltage of a pixel.

Figure 22 be a width of cloth when the video data that is imported into image display when black level changes to white standard, the luminosity response characteristics curve synoptic diagram of pixel, the brightness of ordinate white brightness normalization.

Figure 23 has shown an alternative embodiment of the invention, is the calcspar of pith of the modulation-energized process link of an image display.

Figure 24 is still an alternative embodiment of the invention, has shown the calcspar of pith of the modulation-energized process link of an image display.

Figure 25 is still an alternative embodiment of the invention, has shown the calcspar of pith of the modulation-energized process link of an image display.

Figure 26 has shown a background technology, is the calcspar of pith of the modulation-energized process link of an image display.

Figure 27 has shown another background technology, is the calcspar of pith of the modulation-energized process link of an image display.

Figure 28 is being described in further detail of situation shown in Figure 16.

Figure 29 is being described in further detail of situation shown in Figure 17.

Embodiment

[embodiment one]

Following description will be explained one embodiment of the present of invention to Fig. 9 with regard to Fig. 1.Or rather, according to present embodiment, image display 1 can improve the response speed of pixel, makes the display quality of the image that shows with pixel can significantly not worsen, and can reduce circuit size and reduce calculated amount.For example, the image display 1 of present embodiment can be used as the image display of television receiver better.Attention: the television broadcasting example that is received by television receiver comprises: (i) terrestrial microwave television broadcasting; (ii) satellite broadcasting is such as BS (broadcast satellite) digital broadcasting and CS (telstar) digital broadcasting; (iii) cable tv broadcast.

For example, on the panel 11 of image display 1, can show that sub-pixel point red, green, blue color constitutes a single pixel, the brightness of control sub-pixel point is so that panel 11 can Show Color.Illustrate, as shown in Figure 2, panel 11 comprises: pixel array 2, and it contains sub-pixel point SPIX (1,1), and (n m), arranges with dot matrix way to SPIX; Data signal line scan drive circuit 3 is used to drive the data signal line of the SL1 of pixel array 2 to SLn; Scan signal line drive circuit 4 is used to drive the scan signal line of the GL1 of pixel array 2 to GLn.

Say that further image display 1 comprises: control circuit 12 is used to driving circuit 3 and 4 that control signal is provided; Modulation-energized process part (exciting bank) 21 is used for modulating video signal, is provided for control circuit 12, and be consistent with the vision signal that is transfused to, to strengthen greyscale transformation.Notice that the running of these circuit is by power circuit 13 power supplies.In addition, in the present embodiment, on the direction along scan signal line GL1 to GLn, three adjacent sub-pixel point SPIX constitute single pixel PIX.And according to present embodiment, the sub-pixel point of respective pixel point is called as SPIX (1,1) in claims ....

At this moment, before the structure of carefully stating modulation-energized process part 21, the schematic construction and the principle of work thereof of entire image processing device 1 will be introduced.In addition, for convenience, the numeral of indicating positions or letter only are added when the position that must describe in detail such as i bar data signal line SLi, being marked at the part that needn't indicate the position or mention often and will omitting of indicating positions.

Pixel array 2 includes: a plurality of (being n here) data signal line SL1 is to SLn; A plurality of (being m here) scan signal line GL1 crosses data signal line SL1 to SLn respectively to GLm.When choosing in 1 to n and an arbitrary integer j in 1 to m, (i j) just unites definite by data signal line SLi and scan signal line GLj sub-pixel point SPIX.

In the present embodiment, (i j) is dispensed on the zone that is surrounded by adjacent two data signal line SL (i-1) and SL (i) and adjacent two scan signal line GL (j-1) and GL (j) each sub-pixel point SPIX.

As an example, introduce the situation that image display 1 is a liquid crystal display below.For example, sub-pixel point SPIX (i j) comprises: and field effect transistor SW (i, j), its grid is to be connected to scan signal line GLi and its drain electrode is to be connected to data signal line SLi, is used as a switch switching device; Pixel capacitor Cp (i, j), as shown in Figure 3, its electrode be connected to field effect transistor SW (i, j).And pixel capacitor Cp (i, other electrode j) be connected to one by all sub-pixel point SPIX... shared, on the public electrode.Pixel capacitor Cp (i, j) be liquid crystal capacitor CL (i, j) and the auxiliary capacitor Cs that must be added (i, continuity j).

Sub-pixel point SPIX (i, j) in, when scanning-line signal GL (j) is selected, field effect transistor SW (i, j) conducting, therefore, voltage corresponding to data signal line SL (i) just affacts pixel capacitor C p (i, j), after the selection cycle of scanning-line signal GL (j) finishes, field effect transistor SW (i, j) turn-off, (i j) continues to keep a voltage to pixel capacitor C p, and described voltage just obtains when turn-offing.At this moment, the light transmission of liquid crystal or reflective can (i, j) voltage on changes according to acting on liquid crystal capacitance CL.Like this, selected and as scan signal line GL (j) corresponding to being sent to sub-pixel point SPIX (i, j) corresponding video data D (i, when j, voltage k) just affact on the data signal line SL (i), just may change sub-pixel point SPIX (i, j) demonstration situation, make it that (i, j k) conform to video data D.

Employed liquid crystal display in the present embodiment as a liquid crystal display, has adopted a kind of liquid crystal display of vertical alignment pattern, is not subjected to voltage at photographic layer and does the time spent, and its liquid crystal molecule can be arranged by vertical direction significantly.(i, liquid crystal capacitance CL j) (i, when j) going up, will arrange in vertical direction by its molecule and when voltage affacts sub-pixel point SPIX.Liquid crystal display is used to a state (under this kind state, when not receiving voltage, being shown as black state) that is generally black pattern.

In the structure of talking about in front, scan signal line drive circuit 4 shown in Figure 2, whether it is in the indicator signal in selected cycle for the indication of each scan signal line output from GL1 to GLm, just a voltage signal or similar thing.Scan signal line drive circuit 4 can be output selection cycle signal change scan signal line GLj in addition, for example according to a clock signal, such as the clock signal GCK that is provided by control circuit 12 and a starting impulse signal GSP, so corresponding scan signal line GL1 will be selected successively by predetermined sequential to GLm.

Say that further data signal wire driving circuit 3 extracts video data ..., be imported into sub-pixel point SPIX (i, j) ..., use a kind of time-sharing format, as vision signal, by sample video data D..., perhaps in predefined sequential, adopt a kind of similar mode.In addition, data signal wire driving circuit 3 according to corresponding video data output signal to the corresponding sub-pixel point of scan signal line GLj from SPIX (1, j) to SPIX (n, j) in, GLj is selected to SLn by corresponding data signal line SL1 by scan signal line drive circuit 4.

Attention: data signal wire driving circuit 3 is determined sampling time sequences and from the output timing of that be transfused to, consistent with the clock signal output signal of control circuit 12, for example clock signal SCK and starting impulse signal SSP.

When corresponding scan signal line GLj was selected, according to being added to the output signal of corresponding data signal wire SL1 to SLn, (1, j) (n j) adjusted its radiative brightness or penetrability, thereby determines its brightness sub-pixel point SPIX to SPIX.

At this moment, scan signal line drive circuit 4 sequentially selects sweep signal row GL1 to GLm, like this, the sub-pixel point SPIX (1 that constitutes pixel in the pixel array 2 is set, 1) to SPIX (n, thus m) upgrade through the brightness of corresponding video data representative that shown image is possible in the pixel array 2.

Attention: as long as can specify the gray level of sub-pixel point SPIX, video data D just can have the gray level of oneself, and the parameter of calculating gray level perhaps can be arranged.Yet as an example, following description will be explained the situation when video data D is self gray level of sub-pixel point SPIX.

In addition, in image display 1, the vision signal DAT that offers modulation-energized process part 21 by video signal source VS can be used as a picture unit (entire image unit) and is transmitted, perhaps it may be arranged like this: picture is divided into a plurality of districts, and a district connects ground, a district and transmits vision signal DAT.Yet, as an example, the following describes and will explain that vision signal DAT is connect the situation that ground, a district transmits by a district.

In other words, in the present embodiment, the vision signal DAT that is offered modulation-energized process part 21 by video signal source VS is transmitted in such a way: a picture is divided into several districts (for example, 2 districts), and a district connects ground, a district and transmits vision signal DAT.

In more detail, when vision signal DAT being sent to modulation-energized process part 21 of image display 1 by video signal cable VL, video signal source VS is sent to certain district to all video datas, and then send next district to, thereby, be sent to the video data of each subregion by the timesharing pattern.

Say that further subregion is to be made of many horizontal lines.For example, in video signal cable VL, in a particular zones, a certain horizontal all video datas are transmitted; Then, transmit the horizontal video data of next bar, thereby, the horizontal video data of each bar transmitted by the timesharing pattern.

Attention: in the present embodiment, a picture is made of two subregions.In being numbered each subregion of even number, constituting the horizontal video data that is numbered even number in the horizontal line of a width of cloth picture and be transmitted; In addition, in being numbered each subregion of odd number, the horizontal video data that is numbered odd number is transmitted.And when transmitting a horizontal video data, video signal source VS makes corresponding video data transmit according to predetermined sequence ground by timesharing mode activated video signal cable VL.

Simultaneously, in modulation-energized process part 21, receiving circuit (among the figure not show) is sampled to being sent to video data by video signal cable VL, obtain to affact corresponding sub-pixel point SPIX (i, j) the video data D on (i, j, k).Attention: when transmit by video signal cable VL affact corresponding sub-pixel point SPIX (i, j) the video data D on (in the time of k), receiving circuit is carried out the signal sampling operation in predetermined sequential for i, j, thus the video data D of acquisition sub-pixel point (i, j, k).

Simultaneously, when the video data that affacts respective pixel point was transmitted by video signal cable VL, receiving circuit was carried out the signal sampling operation in predetermined sequential, thereby obtained the video data of respective pixel point.Then, receiving circuit resolves into the colour cell of the corresponding sub-pixel point of this pixel to the color of being represented by video data, thus acquisition affact corresponding sub-pixel point SPIX (i, j) the video data D on (i, j, k).

In image display 1, according to present embodiment, a single pixel is made of three sub-pixel SPIX, and these three sub-pixels correspond respectively to R (red), G (green), B (indigo plant).Equally,, not only comprise the circuit of a relevant R, that is:, but also comprise the circuit of relevant G and relevant B for processing affacts circuit corresponding to the video data D of the sub-pixel point SPIX of R in the modulation shown in Fig. 2-energized process part 21.Yet, except relevant video data D (i, j, k) input beyond, all adopt and arrange corresponding circuit in the same way, like this, below with only making an explanation, referring to Fig. 1 with regard to relevant R circuit.

Or rather, corresponding to present embodiment, the circuit of modulation-energized process part 21 relevant R comprises: a picture memory 31 is used for memory action in the video data of last, the relevant R of sub-pixel point SPIX, make the video data of picture be saved always, just upgrade up to next picture; A memorizer control circuit 32, be used for toward 31 li video datas of writing current picture FR (k) of picture memory, and from picture memory 31, read the video data D0 (i of last width of cloth picture FR (k-1), j, k), (i, j k) are used as the vision signal DAT0 of last width of cloth picture to output video data D0 like this; A modulation processing section (means for correcting) 33 is used to proofread and correct the video data of current picture FR (k), makes that the grayscale transition from last width of cloth picture to current picture is reinforced, and output video data D2 (i, j k) are used as correct vision signal DAT2.

Attention: in the present embodiment, convenient in order to describe, the video data that will export from picture memory 31 is described below: the video data of last width of cloth picture FR (k-1) is known as D0 (i, j, k-1); The video data of preceding second width of cloth picture FR (k-2) (this video data back can be introduced) is known as D00 (i, j, k-2); In addition, based on these two video data D0 (i, j, k-1) and D00 (i, j, k-2), the video data that the gamma correction circuit 37 of the last width of cloth picture that will be introduced by the back generates is known as D0a (i, j, k-1).Attention: in the present embodiment, each sub-pixel point SPIX (1, j), (4, j) ... show R, like this, video data D (1, j, k), D (4, j, k) ... be imported on the entry terminal T1.

Say that further according to present embodiment, modulation-energized process part 21 comprises a BDE (bit-depth expansion) circuit, is positioned between the two: (i) entry terminal T1; (ii) memorizer control circuit 32 and modulation processing section 33 make and reduce the video data D that is stored in the picture memory 31 (i, j, quantity k), and not obvious reduction is presented at the display quality of image in the pixel array 2.The BDE circuit has: a noise adding circuit 34, be used for the noise that is produced circuit (for the noise generation device provides an infinite example) 35 generations by noise is added to the video data D (i that is imported into entry terminal T1, j, k) on, and output generated data; An intercepting circuit 36, be used to clip by the video data of noise adding circuit 34 outputs than low order, thereby reduce the bit wide of video data.(i, j k) are imported into modulation processing section 33 and memorizer control circuit 32, as the video data of current picture FR (k) to the video data D1 that is exported by intercepting circuit 36.Attention: noise produces circuit 35 and intercepting circuit 36 meets a non-limiting example supporting noise to add equipment.

Noise produces random noise of circuit 35 outputs, and in the image that shows with pixel array 2, it can not cause the appearance of false contouring figure, and the mean value of this noise that is output is 0.In addition, undue when big when the maximal value of noise data, just there is a kind of possibility, promptly noise image can be recognized by the user of image display 1, therefore the maximal value of noise can be set so that noise image is not recognized.

In the present embodiment, act on each sub-pixel point SPIX (i, j), be imported into video data D1 on the entry terminal T1 (k) by 8 bit representations, and a lot of noise data is set at for i, j ± 5 in.In addition, intercepting circuit 36 is clipped 2 than low order from the 8 digital video data that produced circuit 35 outputs by noise, and export 6 digital video data D1 (i, j, k).Therefore, for the corresponding video data D1 of the current picture FR of storage (k) (k), the storage area in the picture memory 31 just reduces for i, j, so as each video data D1 (i, j k) meet 6 positions.

Like this, the quantity that reduces by the position that is positioned at the intercepting circuit 36 handled video data of circuit afterwards is possible, and can not cause noise image and false contouring figure to occur on the display image of pixel array 2.In order to prevent that image obviously is different from an image based on the video data D that is not intercepted, and also needs further to handle.

At this moment, the noise that is added can be discerned from the following aspects by the user of image display 1: (i) gray scale (calibration) of observed gray scale and neighboring pixel point why not have with; Why not together, the brightness of (ii) observed gray scale and object brightness (error) have.Usually, well-known: as, approximately to be that the calibration limit of 5%, one permission of white luminance approximately is to be shown 5% of gray scale as the extent of the error of 1, one permission of image display in a zone based on the clear demonstration of 100ppi.At this moment, shown in Figure 4 is: when being increased by x gray scale direction with the pixel gray-scale displayed, the penetrability of pixel is how to increase with number percent along with the brightness (penetrability before increasing gray scale) of periphery.

In addition, what Fig. 5 was shown is: when being increased by the x gray scale with the pixel gray-scale displayed, the penetrability of pixel is how to increase with number percent along with initial penetrability (penetrability before increasing gray scale).This has illustrated such result, that is: when 8 to 12 gray noise, nearly all gray scale can not surmount the limit of permission, therefore just might prevent that the user from identifying the obvious deterioration of display quality.Attention: when vision signal γ=2.2, each figure that the front is introduced has shown a numerical value, is called ordinary video signal DAT.

Therefore, when supposing that the user watches image across a segment distance, so that can not see a single pixel clearly, with 2 to 3 pixels (6 to 9 sub-pixels), calibration and error precision all are set to be no more than 5%.This cun, when noise data is normal distribution veritably, following gray scale is: 8 to the 12[gray scale] * 6 ^(1/2)To 9 ^(1/2)=20 to the 36[gray scale].Therefore, even fixing noise is added in the time series mode, so that the width that must put in place, for example about 5 bit wide that is to say, bit wide is lacked 3 than video data D, and noise image just can not be identified by the user of image display.

Attention: even when the pixel size becomes bigger, generally, the user can watch the distance of image can therefore not increase.Like this, when the pixel size became bigger, it is littler that the proof strength of noise data will become.So, in gray scale from 1 to 32 (in 5 positions) numerical range, as the greatest measure of the absolute value of noise data, numerical range that adopted, preferably is 12 to 20 gray scales in most of image displays 1, and preferably numerical range is arranged to 15 gray scales (4 positions).

Produce circuit 35 as noise, it is possible using various counting circuit, for example: a counting circuit that includes linear feedback shift register (M series and Gold series), but corresponding to present embodiment, noise produces circuit 35 and includes: a storer 51, be used to store the noise data that pre-determines block, for example 16 * 16 or 32 * 32; An address counter 52 is used for sequentially reading noise data from storer 51; And a control circuit 53, be used to produce a reset signal and restart address counter 52.

Control circuit 53 restarts address counter 52, make have identical numerical value get noise signal be added to and spread all over whole image, be applied same sub-pixel point SPIX (i, video data D j) (i, j, ^*) on.For example, in the present embodiment, in the combination of the video data that comes from video signal source VS shown in Figure 2, control circuit 53 adopts the signal of horizontal synchronization and a kind of signal Synchronization in the vertical synchronizing signal to restart address counter 52 at least.As a result, noise adding circuit 34 just can have identical numerical value get noise signal add to and spread all over whole image, be applied same sub-pixel point SPIX (i, video data D j) (i, j, ^*) on.

Therefore, when one in the image display 1 display pixel lattice array 2 static image, act on sub-pixel point SPIX (i, correcting video data D2 j) (i, j, ^*) can not change.Similarly, can show one stable, not flicker and also not because correcting video data D2 (i, j, ^*) variation and caused the rest image of noise.Here, ^*Represent an any number.

Attention: the random noise data are to be stored in the storer 51.Therefore, on each picture, the random noise data are added to and act on the video data on the sub-pixel point SPIX, that be arranged in same block.As a result, in the shown image of pixel array 2, false contouring figure can not appear.

In more detail, in the present embodiment, picture memory 31 is preserved the video data of last width of cloth picture, has come just to upgrade up to next width of cloth picture; Control circuit 32 reads the video data D00 of preceding second width of cloth picture FR (k-2), and (k-2), and output data is used as preceding second vision signal DAT00 for i, j.

In addition, the modulation-energized process part 21 corresponding to present embodiment comprises a last width of cloth picture gamma correction circuit (secondary means for correcting) 37.For each sub-pixel point SPIX (i, j), one of last width of cloth picture gamma correction circuit 37 prediction are from video data D00 (i, j is k-2) to video data D0 (i, j, k-1) gray scale that is obtained in the grayscale transition process, and video data D0 (i, the j of last width of cloth picture FR (k-1), k-1) be modified to predicted value D0a (i, j, k-1), so that prediction of output value D0a is (i, j, k-1).Modulation-energized process part 33, in order to strengthen sub-pixel point SPIX (i, j), the grayscale transition from last width of cloth picture to current picture, according to last width of cloth picture video signal DAT0 that has proofreaied and correct and current picture video data-signal DAT, proofread and correct the video data D1 (i of current picture FR (k), j, k).

According to said structure, and the video data D1 of the modulation processing section 33 current picture FR of correction (k) (i, j, k), so that strengthen by the grayscale transition of last width of cloth picture FR (k-1) to current picture FR (k).Similarly, just may improve the response speed of sub-pixel point SPIX.As a result, even when adopting the very slow sub-pixel point SPIX of original response speed, also may come display image with a very fast response speed.

In addition, in the previous stage of picture memory 31, be a BDE circuit, it comprises noise adding circuit 34 and intercepting circuit 36.Similarly, this just might reduce the video data D that is stored in the picture memory 31 (i, j k), and can not reduce the display quality of the image that is shown in the pixel array 2 significantly.

In the present embodiment, (bit wide is 8 k) for i, j, and (bit wide is dropped to 6 k) for i, j to be stored in video data D1 in the picture memory 31 although be imported into video data D on the entry terminal T1.Therefore, this just might reduce needed memory capacity in the picture memory 31.

In addition, circuit after being arranged in intercepting circuit 36, that is to say, in memorizer control circuit 32, last width of cloth picture gamma correction circuit 37, modulation processing section 33, as shown in Figure 2 control circuit 12 and data signal wire driving circuit 3, the bit wide of video data all is reduced to 6 from 8.Similarly, this just might reduce: the quantity that (i) connects lead; (ii) by connecting 3/4 of the shared area of lead.As a result, just might reduce the calculated amount of these circuit.

Attention: must be under quite high speed converting video frequency data.Therefore, for by utilizing a suitable low circuit of response speed to come converting video frequency data, must provide parallel a plurality of circuit and function circuit alternately.As a result, when the figure place of video data increased, the area shared by these circuit just increased.Yet according to said structure, bit wide reduces to 3/4, and therefore, this just might prevent to be increased by the shared area of these circuit, even these circuit all adopt parallel work-flow each other.

In addition, according to the structure of introducing previously, the BDE circuit is positioned at the previous stage of picture memory 31 and modulation processing section 33, and it comprises noise adding circuit 34 and intercepting circuit 36.Therefore, the situation of back one-level that is positioned at modulation processing section 33 with BDE is different, aforesaid structure can not brought following shortcoming: be positioned at after the modulation processing section 33, when the excessive brightness of inhibition takes place, can strengthen grayscale transition as much as possible, the BDE circuit adds noise, makes excessive brightness be identified by the user.As a result, according to aforesaid structure, although the interpolation of noise and grayscale transition are performed together, what prevent excessive brightness is possible.

By the way, group pixel SPIX (i, when response speed j) is very slow, just will cause following point: although can be reinforced in last width of cloth picture FR (k-1) lining by the grayscale transition of preceding second width of cloth picture to last width of cloth picture, but (i j) can not successfully reach video data D1 (i by last width of cloth picture FR (k-1) to sub-pixel point SPIX, j, k-1) indicated gray scale.In this case, when strengthening grayscale transition in current picture FR (k) lining, suppose fully to have carried out by the grayscale transition of preceding second width of cloth picture to last width of cloth picture, this just has a kind of possibility, may strengthen grayscale transition very inadequately so that occurred by force or weak excessively brightness that is:.

For example, continuous lines shown in Figure 6, when by preceding second width of cloth picture when the grayscale transition of current picture is " decay-rising " curve, this will bring following shortcoming: dotted line shown in Figure 6 does not have fully to carry out by the grayscale transition of preceding second width of cloth picture to current picture.In addition, in the The initial segment of picture FR (k), intensity of brightness does not fall fully.In current picture FR (k), when actuate pixel point, the mode that is adopted with previous state how grayscale transition all fully to be carried out the mode that is adopted under the situation of (dot-and-dash line shown in Fig. 6) identical, just strengthened grayscale transition excessively, cause occurring strong brightness.

In addition, continuous lines shown in Figure 7, when by preceding second width of cloth picture when the grayscale transition of current picture is " rising-decay " curve, this will cause following point: dotted line shown in Figure 7 does not have fully to carry out by the grayscale transition of preceding second width of cloth picture to current picture.In addition, in the The initial segment of picture FR (k), intensity of brightness does not fall fully.In current picture FR (k-1), when actuate pixel point, the mode that is adopted with previous state how grayscale transition all fully to be carried out the mode that is adopted under the situation of (dot-and-dash line shown in Fig. 7) identical, just strengthened grayscale transition excessively, cause occurring weak brightness.

When occurring by force or during weak excessively brightness, its gray scale has departed from the effective range between last width of cloth picture gray scale and current picture gray scale, make this cross by force or excessively a little less than brightness be very tangible for the user.As a result, this situation has seriously reduced the display quality of image display.To illustrate especially, when strong brightness occurring,, but cause the serious reduction of display quality even it is very of short duration to spend the time of strong brightness appearance.

On the other hand, for each sub-pixel point SPIX (i, j), corresponding to the last width of cloth picture gamma correction circuit 37 of present embodiment, predict a gray scale that to the grayscale transition process of last width of cloth picture, is obtained from front second width of cloth picture, wherein these preceding two width of cloth pictures correspond respectively to and do not revise video data D00 (i, j, k-2) and do not revise video data D00 (i, j, k-1), and the video data D1 of last width of cloth picture FR (k-1) (i, j k-1) are modified to predicted value D0a (i, j, k-1).As a result, just might prevent by force or weak excessively brightness, thus the display quality of raising image display 1.

In addition, (k) therefore different with the display device 501a shown in Figure 27, even error occurs in trimming process, error can not be stored by the time the uncorrected video data D1 of picture memory 31 storages yet for i, j.Therefore, even when preventing superpower or superweak brightness and reduce predetermined computational accuracy, but the reduction of computational accuracy can't cause dispersing of pixel gray-scale intensity control and or rock, this point is different with image display 501a.As a result, just may realize having image display 1 more small size, that can effectively prevent superpower or superweak brightness than image display 501a.

In more detail, as shown in Figure 1, comprise a LUT (tabling look-up) 71 corresponding to the previous stage gray correction 37 of present embodiment.What LUT 71 stored is the gray scale that has obtained, correspond respectively to last gray scale and current gray level combination.Here " gray scale that has obtained, correspond respectively to the combination of last gray scale and current gray level " mean " be imported in the composite video data under the situation of modulation processing section 33; group pixel SPIX (i; when j) being energized is corresponding to the gray scale of next frame video data ".In addition, in the present embodiment, in order to reduce memory capacity required among the LUT 71, the gray scale that has obtained, be stored among the LUT 71 can not be represented all gray scales of combination of gray scale, and has only expressed gray scale limited, predetermined gray scale combination; Last width of cloth picture gamma correction circuit 37 comprises a counting circuit 72.Counting circuit 72 is combined into row interpolation and calculates according to being stored among the LUT 71 each, according to two video data D00 (i, j, k-2) and video data D0 (combination k-1) is calculated for i, j, and (i, j is k-1) as result of calculation to export a predicted value D0a.

In addition, in this example, in order to reduce memory capacity required in the picture memory 31, control circuit 32 has reduced current picture FR (k) and has gone up video data D1 (i, j, data length k).Subsequently, control circuit 32 in picture memory 31, and in picture FR (k+1) subsequently, is used as data storage as the data of being stored video data D0 (i, j, k) output of last width of cloth picture FR (k).In addition, control circuit 32 reduces last width of cloth picture FR (k-1) further and goes up video data D0 (i, j, k-1) data length, then with data storage in picture memory 31, and in picture FR (k+1) subsequently, the data of being stored are used as again the video data D00 (i of last width of cloth picture FR (k-1), j, k-1) output.

For example, in the present embodiment, ((i, j, data length k-1) are set to 4 positions and 6 positions respectively to the video data D0 of data length k-2) and last width of cloth picture FR (k-1) to the video data D00 of preceding second width of cloth picture FR (k-2) for i, j.Because like this,, also only need 30 positions even R, G, B are stored respectively.Therefore, (bit wide of data bit is set to 2 in the storer adopting general storer ⁿ) situation under, video data D0 (i as the last width of cloth picture FR of storage (k-1), j, k-1) time, though should stored video data D0 (i, j, k) but also will store the video data D00 (i of preceding second width of cloth picture FR (k-2), j k-2), is fine but store data with a storer with identical memory capacity.

In addition, in the present embodiment, as shown in Figure 8, make up described zone by gray scale, be divided into 8 * 8 zoning, LUT71 preserves 4 angles (9 * 9 point) of each zoning.Attention: in Fig. 8 and Fig. 9, what Z-axis was represented is an initial gray scale (gray scale of last again width of cloth picture), and what transverse axis was represented is target gray scale (gray scale of last width of cloth picture).When to the right and move down, it is bigger that gray scale will become.In addition, for convenience, Fig. 8 of follow-up introduction, Fig. 9 and Figure 12, each figure has all shown a gray scale, this gray scale all is not subjected to the influence of intercept operation, that is to say, this numerical value (value is exaggerated four times) is by the video data D1 (i of 6 positions, j k) expands to 8 positions and obtains.

At this moment, Fig. 9 has shown the example of a numerical value when adopting the liquid crystal cell vertical alignment pattern, that be generally black pattern.In this liquid crystal cell, the response speed of grayscale transition that is in " decay " stage is slower than the response speed of the grayscale transition that is in " rising " stage.Therefore, even liquid crystal cell is energized so that strengthens grayscale transition after carrying out modulation, but from last width of cloth picture again to the last width of cloth picture time, the grayscale transition of reality and desirable grayscale transition difference often occurs between the two.

Therefore, resulting true gray scale is bigger than the gray scale (E) that should obtain among the regional a1, and is wideer than regional a2, and wherein resulting gray scale is more much smaller than the gray scale that will obtain.Attention: regional a1 and a2 are inequality at aspects such as video data and true gray scales each other, make last width of cloth picture gamma correction circuit 37 do not carry out proofread and correct and modulation processing section 33 according to the video data D1 (i of last width of cloth picture FR (k-1), j, k-1) the video data D1 (i of the current picture FR of correction (k), j, k) time, these differences are identified by the user.

In addition, when two video data D00 (i, j, k-2) and D0 ((S, when E) being transfused to, counting circuit 72 is just determined the zone under this combination in combination k-1) for i, j.

In addition, when the upper left corner, the upper right corner, the lower right corner, the lower left corner are defined as A, B, C, D respectively, and the zoning is wide when being defined as Y*X, by (S0 is E0) with above-mentioned combination (S, E) difference between the two (1 to being present in the combination that is positioned at the upper left corner, 1) carries out normalization, resulting value is: (Δ y, Δ x)=((S-S0)/Y, (E-E0)/X).As Δ x 〉=during Δ y, counting circuit 72 is read A, B, C corresponding gray scale separately from LUT 71, with following formula (1) calculate D0a (i, j, k-1):

D0a(i，j，k-1)＝A+Δx·(B-A)+Δy·(C-B) (1)

In addition, when Δ x＜Δ y, counting circuit 72 is read A, C, D corresponding gray scale separately from LUT 71, with following formula (2) calculate D0a (i, j, k-1):

D0a(i，j，k-1)＝C+Δx·(C-D)+(1-Δy)·(D-A) (2)

For example, in Fig. 8 and Fig. 9, when (S E) is (144,48), has determined a zoning that is surrounded by (128,32), (128,64), (160,32), and (i, j are 60 after correction k-1) to the video data D0a of last width of cloth picture FR (k-1).Therefore, this be different from when modulation processing section 33 according to the video data D1 of last width of cloth picture FR (k-1) (i, j, k-1) to the video data D1 of current picture FR (k) (i, j k) revise=48; (k)=60, (i, j k) are corrected video data D1, make to prevent that possibility from appearring becoming in superpower brightness for i, j according to the video data D0a after proofreading and correct.

Attention: example is explained in the introduction of front, when obtained, (numerical value k) (6 positions) is the same for i, j with video data D1 to be kept at gradation data length (bit wide) among the LUT 71.Yet, when the memory capacity of LUT 71 must reduce, for consistent with data length, must setting data length that obtained, that be kept at each gray scale among the LUT71 (bit wide) not excessive, following column selection is arranged: (i) video data D00 (i of preceding second width of cloth picture FR (k-2), j, data length k-2); The video data D0 of (ii) last width of cloth picture FR (k-1) (i, j, data length k-1).

Still in this structure, utilize preceding second and previous video data, the data length of resultant gray scale is configured to have the bit wide that significance bit is calculated in identical participation, or rather, and exactly in order to meet a less bit wide.Therefore, may reduce memory capacity required among the LUT1, prevent that simultaneously computational accuracy from worsening.

[embodiment 2]

As shown in figure 10, comprise a FRC (control of picture refreshing rate) circuit (least significant bit (LSB) control device) 38 corresponding to the modulation one exciting circuit processing section 21a of present embodiment, this circuit is installed between the two following: (i) intercepting circuit 36; (ii) picture memory 31 and modulation processing section 33.

According to video data D (k), FRC circuit 38 is based on a predetermined pattern for i, j, changes the least significant bit (LSB) by the video data of intercepting circuit 36 outputs, export then this signal that has changed least significant bit (LSB) as video data D1 (i, j, k).Predetermined pattern is set, makes the value of the position of being clipped by intercepting circuit 36 corresponding to the mean value of the numerical value that constitutes this pattern.Illustrating, when being " 01 " by the value (2 positions) clipped, is 1/4 by the correlation values of the least significant bit (LSB) of the video data of intercepting circuit 36 outputs, like this, corresponding to aforesaid pattern, (0,0,0,1) for example is set is used as a pattern.Similarly, the pattern of (0,0,0,0), (1,0,1,0) and (1,1,1,0) is set, makes separately corresponding to " 00 " " 10 " and " 11 ".

In aforesaid structure, (least significant bit (LSB) k) changes for i, j, makes the value of the position of being clipped by intercepting circuit 36 corresponding to the mean value of the numerical value that constitutes this pattern to video data D1 because FRC circuit 38 serves as the basis with a predetermined pattern.Therefore, this is possible, and (i, the mean value of brightness j) make it corresponding to being clipped the least significant bit (LSB) indicated brightness of video data before by intercepting circuit 36 promptly to make a sub-pixel SPIX.

Attention: group pixel SPIX (i, (i j) can not be according to the video data D2 (i that has been corrected for the too slow so that sub-pixel point SPIX of response speed j), j, k) variation and change brightness, (i, the mean value of brightness j) and aforesaid ideal value are inconsistent for sub-pixel point SPIX.Yet, according to present embodiment, in modulation-energized process part 21a, the position that is changed by FRC circuit 38 is video data D1 (i, j, least significant bit (LSB) k), the grayscale transition that modulation processing section 33 is strengthened from last width of cloth picture FR (k-1) to current picture FR (k).Therefore, modulation-energized process part 21a can have no obstacle ground and sub-pixel put SPIX (i, the mean value of brightness j) is set to aforesaid ideal value.

At this moment, by each sub-pixel point SPIX (i, j) shared zone is very little, and spatial resolution and brightness resolution are set to and approach or exceed under people's the situation of the visual identity limit, promptly suppose seeing on the distance that to see each pixel clearly under the situation of pel array 2, even it approximately is the steady noise of 5 positions that noise adding circuit 34 has been added one in the time series mode, noise image also can not be identified by the user of image display.The example of this image display comprises: 15 inches XGA (enhancing graphic array) display and similar equipment.In this case, (i, j) distance between (the best) is set to about 300 μ m to sub-pixel point SPIX.

Yet, in such structure, steady noise is added in the time series mode, when the spatial resolution of pixel array 2 and brightness resolution have exceeded the aforesaid limit, this just has a kind of possibility, that is: shown image is in (for example, specific brightness or specific motion state) under the specific conditions in pixel array 2, and perhaps noise image can be identified by the user of image display 1.The example of this image display comprises: 15 inches VGA display and similar equipment.

On the other hand, according to present embodiment, in modulation-energized process part 21a, (least significant bit (LSB) k) changes 38 couples of video data D1 of FRC circuit for i, j.Like this, when modulation-energized process part 21a is applied in this type of image display, might be able to prevent that noise image from being identified by the user, therefore, situation about being added in the time series mode with steady noise by comparison, this just can improve the outward appearance display quality of image display 1a.

[embodiment 3]

By the way, in embodiment 1 and 2 explanation: by noise adding circuit 34 be added to video data D (i, j, ^*) on noise be to immobilize in the time series mode, for sub-pixel point SPIX (i, j), always the noise of identical numerical value add to video data D (i, j, ^*) on.On the other hand, present embodiment will illustrate: by noise adding circuit 34 be added to video data D (i, j, ^*) on noise be to change in the time series mode.Attention: this structure also can be applied in embodiment 1 and 2.Below will introduce the situation that is applied to embodiment 1 about the described structure of Fig. 1.

Or rather, in the modulation-energized process part 21b of present embodiment, in order to produce a noise that changes in the time series mode, noise produces circuit 35b and is used to replace noise generation circuit 35.In the noise adding circuit 35b of present embodiment, control circuit 53b is used to replace control circuit 53, it at each picture change reset time-delay and the picture FR (k) that are present in address counter 52 first video data D (1,1, the k) phase difference between.

For example, in first width of cloth picture FR (k), control circuit 53b is working as first video data D (1 sometime, 1, when k) being employed, restart address counter 52, be stored in the storer 51 noise data in first address just be added to first video data D (1,1, k) on.In next width of cloth picture FR (k-1), control circuit 53b is arranged to the time-delay that resets of address counter 52 more earlier by single video data, make be stored in the storer 51 noise data in second address just be added to first video data D (1,1, k+1) on.

According to the method, noise adding circuit 34 with the time series mode conversion be added to video data D (i, j, ^*) on noise.Here, as described previously, when the spatial resolution of pixel array 2 and brightness resolution are set to when approaching or exceeding the limit that human vision can discern, even steady noise is added in the time series mode, noise image also can not be identified by the user of image display 1.

Yet, under the situation of the limit that the spatial resolution and the brightness resolution of pixel array 2 can be discerned well below human vision, as described previously, when steady noise is added in the time series mode, (i j) will be identified by the user of this image display each sub-pixel point SPIX.The example of this image display has: 20 inches VGA display, 40 inches XGA display, and similar equipment.

On the other hand, according to present embodiment in modulation-energized process part 21b, by noise adding circuit 34 add to video data D (i, j, ^*) on noise be to change in the time series mode.Like this, even when modulation-energized process part 21b is applied to this image display, also there is a kind of possibility, that is: can prevent that noise image from being identified by the user, compare this with the situation that steady noise is added in the time series mode and just make that the outward appearance display quality that improves image display 1b will become possibility.

By the way, in order to show stable, as not have a flicker and noise rest image, according to present embodiment, as the video data D0a of last width of cloth picture FR (k-1) (i, j, k-1) with the video data D1 of current picture FR (k) (i, j is when k) the predefined threshold value of the diversity ratio between is little, modulation-energized process part 33 will not strengthened grayscale transition, and output not with the video data D1 of picture FR any correction, current (k) (i, j, k).

In this case, threshold value being set is varying width in order to adapt to a noise and to change in the time series mode.Varying width when more particularly, threshold value will be equal to, or greater than this noise and changes in the time series mode; Threshold value is provided with too for a short time, so that: even without the reinforcement grayscale transition, because sub-pixel point SPIX (i, j) response speed deficiency, and cause inappropriate grayscale transition not to be identified.For example, suppose aforesaid numerical value, that is: (i, j k) are 8 positions, and noisiness is ± 5 positions, and intercepting circuit 36 is clipped 2 positions, and then threshold value is set to 8 gray scales (=2 as video data D ^(5-2)).

After this manner, threshold value is set to a numerical value, the varying width that this numerical value is equal to, or greater than noise when changing in the time series mode.Therefore, when showing a rest image, even noise causes video data D (i, j, k) great changes will take place, causes occurring grayscale transition, and modulation processing section 33 will not strengthened grayscale transition, and output not with the video data D1 of picture FR any correction, current (k) (j, j, k).After this manner, suppose to have only by adding noise data just can cause grayscale transition, then do not strengthen grayscale transition according to present embodiment modulation processing section 33; Suppose to have only by adding noise data and allowing FRC circuit 38 change least significant bit (LSB) just can cause grayscale transition, so, do not strengthen grayscale transition by FRC circuit 38 being added to 33 of modulation processing section that obtain in the structure of embodiment 3.Therefore, the grayscale transition that is caused by noise is not reinforced, and this just might prevent such shortcoming: because the grayscale transition that noise causes, noise image is recognized by the user.

In addition, suppose the same with present embodiment, by noise adding circuit 34 be added to video data D (i, j, ^*) on noise with timing variations, that is to say that the distance that hypothesis is watched image (allows the user of image display can see each sub-pixel point SPIX (i clearly at one than the distance of watching image in embodiment 1, j) distance) to lack, then more need to be provided with a greatest measure by the absolute value of the noise data of noise generative circuit 35 generations, this numerical value is no more than 8 gray scales.

[embodiment 4]

The maximal value that description has before this been introduced by the noise generation noise data that circuit generated is the example of constant.Yet (k) gray scale of representative changes and the structure that changes the maximal value that present embodiment will be introduced a kind of noise data for i, j according to the video data D that is imported into entry terminal T1.Attention: this structure goes for embodiment 1 to 3.Will introduce the situation of aforesaid structure applications below, referring to Figure 11 in embodiment 1.

Exactly, according to present embodiment, in modulation-energized process part 21c, the noise that noise generation circuit 35c is used to replace as shown in Figure 1 produces circuit 35, and it can change the intensity of the noise data that is output.And, also provide a gray scale to measure part (for the amount of noise control device provides the non-limit support exemplary) 39, be used to detect video data D (i, j, k) display gray scale, and the order noise produces circuit 35c according to the suitable noise of testing result output.

The video data D that gray scale mensuration part 39 will affact sub-pixel point SPIX in a certain block averages, for example the MPEG of a preliminary dimension (mobile motion picture expert group version) block.When resulting mean value was very big, then gray scale was measured part 39 and is provided instruction so that export one group of noise data, and the maximal value of this noise is bigger than the noise maximal value of exporting under the very little situation of mean value.For example, gray scale is measured part 39 and is provided instruction so that export noise that be directly proportional with mean value, that have bigger numerical.

Though noise produces circuit 35c and has comprised a mlultiplying circuit 54, be used to amplify by gray scale measure part 39 indicated and by the data of storer 51 outputs, export the multiplied result of these two signals.Mlultiplying circuit 54 changes the maximal value of the noise data of being exported by noise generation circuit 35c, so that make maximal value consistent with indicated value.

In aforesaid structure, when the mean value of video data D in the block is very big, the maximal value of noise is set to very big, that is to say, in this case: even when the intensity of noise is very big, noise image can be identified by the user hardly, and this is because the relative intensity of noise is than littler under the very little situation of mean value.On the other hand, when the mean value of video data D is very big, the maximal value of noise is set to very little, that is to say, in this case: unless that the intensity of noise is set to is littler, otherwise noise image will be identified by the user, and this is because the relative intensity of noise is than bigger under the very big situation of mean value.The result, mean value regardless of the brightness of block, all the noise maximal value might be provided with to such an extent that be complementary with mean value, so that can realize image display, the display quality of this image display is that the display quality under the situation of fixed numbers is higher than the maximal value of noise.

Notice that the example of the block of calculating mean value corresponding to the MPEG block introduced in the description of front, but this arrangement is not limited only to this, it can be designed to allow to be provided with the mean value of the block of arbitrary dimension.Yet, when show one as mpeg image, be each block coding image the time, ideal situation is: mean value is set in case the block that is used for encoding big or small to get the block size identical with being used for detecting mean value.

Attention: the description of front has been introduced the video data D of all sub-pixel point SPIX that comprised by the example of mean time in block, but this arrangement is not limited only to this.As long as arrange well, the average video data D that offers sub-pixel point SPIX of predetermined quantity in the block just, for example, in the block corresponding to the sub-pixel point SPIX (i of specific scan signal line GL, j), just might prevent following shortcoming, promptly just might prevent following shortcoming: as block neutron pixel SPIX (i, during gray scale around j) indicated gray scale is same as far from, according to this sub-pixel point SPIX (i, j) video data D (i, j, k), the noise maximal value is configured to unsuitable numerical value.

[embodiment 5]

By the way, the example that previous stage picture gamma correction circuit 37 is always revised last width of cloth picture video signal DAT0 has been introduced in the description of front.On the other hand, according to present embodiment, at modulation-energized process part 21d, as the predicted value D0a (i, the j that are obtained by previous stage picture gamma correction circuit 37, k-1) and the video data D0 (i of last width of cloth picture FR (k-1), j, k-1) difference (absolute value) is not less than and preestablishes when sending out threshold value then prediction of output value of previous stage picture gamma correction circuit 37d D0a (i between the two, j, k-1).In addition, in another case, the last width of cloth picture video signal DAT0 of any correction is not made in previous stage picture gamma correction circuit 37d output.Attention: among each embodiment that is introduced above this structure can be applied to too.Will introduce the situation of aforesaid structure applications below, referring to Fig. 1 in embodiment 1.

Exactly, present embodiment is that (gray scale k) all is the example of 6 positions to each video data D1 for i, j, and aforesaid threshold value is configured to be about 2 gray scales.Attention: because each factor is such as quantize noise, precision of prediction can reduce.Therefore, according to these factors, perhaps aforesaid threshold value is configured to be about 2 to 4 gray scales.

At this moment, as predicted value and desired value (D0 (i, j, when k-1)) difference between the two is very little, when compare sub-pixel point SPIX (i with aforesaid widely different situation, j) gray scale will near in last width of cloth picture FR (k-1) by video data D0 (i, j, k-1) represented gray scale.Therefore, even previous stage picture gamma correction circuit 37d does not carry out correction, (k-1) (k), this superpower or superweak brightness may occur to the video data D of the current picture FR of correction (k) hardly for i, j for i, j and modulation processing section 33 is according to video data D0.Even occur the phenomenon of superpower or superweak brightness, the phenomenon of that appearance also is slight.

In addition, when predicted value and the desired value difference between the two was very little, the relative error of prediction was just correspondingly bigger under the widely different situation between the two than predicted value and desired value.Therefore, when strengthened the modulated processing section of grayscale transition 33, the grey scale change that is caused by the error of prediction was tended to the trend that identified by the user.

On the other hand, (during D0 (i, j, k-1)) widely different between the two, superpower or superweak brightness will appear, unless last width of cloth picture video signal DAT0 is corrected when predicted value and desired value.And the relative error of prediction is very little, makes the grey scale change that is caused by the error of predicting be identified by the user hardly.

In the present embodiment, as predicted value and desired value (D0 (i, j, when k-1)) difference between the two is less than threshold value, or rather, be corrected unless occur last width of cloth picture video signal DAT0 hardly in superpower or superweak brightness, and the error in the prediction will worsen under the situation of display quality when last width of cloth picture video signal DAT0 is corrected, previous stage picture gamma correction circuit 37d will not proofread and correct last width of cloth picture video signal DAT0.Unless only under situation that last width of cloth picture video signal DAT0 is corrected appears in superpower or superweak brightness hardly, previous stage picture gamma correction circuit 37d will proofread and correct last width of cloth picture video signal DAT0.As a result, the display quality that inhibition is caused by the error in the prediction, this just might prevent the appearance of superpower or superweak brightness.

[embodiment 6]

Embodiment 5 introduces such structure, that is: whether previous stage picture gamma correction circuit 37d must carry out and proofread and correct or do not carry out correction, and this is to be decided by predicted value and the desired value difference between the two.Present embodiment will be introduced such structure, that is: whether must carry out the indication information of proofreading and correct and be write LUT1 in advance, and previous stage picture gamma correction circuit is proofreaied and correct by judging whether with reference to this information to carry out.Attention: this structure also is applicable to each embodiment, but following description will be introduced the situation of this structure applications in embodiment 1.

Specifically, be designed as followsly corresponding to the LUT 71e of present embodiment, as shown in figure 12, be stored among regional a1 and the a2, be respectively with numerical value identical among Fig. 9: the zone, according to video data D1 (i, j, k) different each other; Actual gray scale, when previous stage picture gamma correction circuit 37 is not carried out correction, and among the modulation processing section 33 last width of cloth picture FR of foundation (k-1) by video data D1 (i, j, k-1) video data D1 (i, the j of the current picture FR of correction (k), k) time, its difference is identified by the user.Yet that other regional a3 stores is target value (E).

When video data D00 (i, j, k-2) and D0 (i, j, (S E) is transfused in combination k-1), and the zoning under should combination is when designated, reads a predetermined known gray scale from the gray scale A at four angles being arranged in the zoning to D corresponding to the counting circuit 72e of present embodiment.Then, will further determine aforesaid resulting gray scale, make this step whether will be recorded as known gray scale, exactly, judge that (S E) belongs to or do not belong to regional a3 in combination with the decision desired value whether corresponding to the gray scale on border, zoning.In addition, (S is to belong to regional a3 E), and counting circuit 72e does not proofread and correct last width of cloth picture video signal DAT0 when judging combination.Only (S is when belonging to regional a1 and a2 E) to counting circuit 72e, proofreaies and correct last width of cloth picture video signal DAT0 judging combination.

Therefore, as in embodiment 5, when superpower or superweak brightness not occurring, the deterioration of the display quality that error caused that is produced by predicted value is predictable, does not need to proofread and correct last width of cloth picture video signal DAT0.Only when the superpower or superweak brightness of white occurring, just might proofread and correct last width of cloth picture video signal DAT0.

[embodiment 7]

Present embodiment will be introduced a kind of structure, be used for changing by the performed treatment for correcting of last width of cloth picture gamma correction circuit according to temperature.Attention: this structure can be applied to each among the embodiment 1 to 6, but following what will introduce is the example that is applied to embodiment 6.

Exactly, as shown in figure 13, the modulation-energized process part 21f corresponding to present embodiment is not only the structure that comprises among the embodiment 6, but also has comprised a temperature inductor 40, is used to detect the temperature of sub-pixel point SPIX.When the combination of the video data D0 of the video data D00 of certain preceding second width of cloth picture and last width of cloth picture is transfused to, whether last width of cloth picture gamma correction circuit 37f decision is necessary correcting video data D0, and, revise the video data D0a that proofreaies and correct according to by temperature inductor 40 detected temperature.

Particularly, comprise a plurality of LUT71f, correspond respectively to predetermined temperature range corresponding to the last width of cloth picture gamma correction circuit 37f of present embodiment.Resulting numerical value in each LUT 71f storage relevant temperature scope is just as at LUT 71.

Though the counting circuit 72f of last width of cloth picture gamma correction circuit 37f selects LUT 71f, this was mentioned in carrying out interpolation calculation, came from LUT 71f corresponding to the temperature information that obtains from temperature inductor 40.

At this moment, when liquid crystal cell is used, when for example being taken as sub-pixel point SPIX, the response speed of liquid crystal cell is according to temperature variation.In this case, when the sub-pixel point SPIX that changes according to temperature when response speed is used, temperature change the Rule of judgment that whether will proofread and correct video data D1, carry out by modulation processing section 33, this influence causes not carrying out any timing as last width of cloth picture gamma correction circuit 37f, superpower or superweak brightness will occur.

Yet, in aforesaid structure, even the response speed of sub-pixel point SPIX changes according to temperature variation, make and prevent that superpower or superweak brightness from required correct operation occurring and being changed, last width of cloth picture gamma correction circuit 37f can proofread and correct last width of cloth picture video signal DAT0 according to the temperature of current sub-pixel point SPIX, so no matter this just might prevent that superpower or superweak brightness from occurring and temperature.

In addition, in the time of in temperature is elevated to a predetermined temperature range, according to present embodiment, last width of cloth picture gamma correction circuit 37f stops to proofread and correct last width of cloth picture video signal DAT0.Therefore, when temperature so rises so that sub-pixel point SPIX (i, when j) the enough speed enough, that can prevent superpower or superweak brightness appearance of energy responds, modulation processing section 33 is according to the vision signal DAT of uncorrected last width of cloth picture video signal DAT0 and current picture, proofread and correct the vision signal DAT of current picture, make and strengthen by the grayscale transition of last width of cloth picture to current picture.

The result, just might prevent to reduce the response speed of image display 1 and do not bring following point: suppress grayscale transition by last width of cloth picture gamma correction circuit 37f, no matter temperature regime how, this can not cause superpower or superweak brightness to occur owing to the response of deficiency.

Attention: the example when LUT 71f is switched has been introduced in the description of front.Yet, resulting numerical value is about variation of temperature and monotone variation, make it to be arranged like this: counting circuit 72f from two the temperature indication LUT 71f of close Current Temperatures read resulting numerical value, so that these two temperature are carried out interpolation, therefore calculate institute's value of Current Temperatures.In this structure,, just might prevent and have high-precision superpower or superweak brightness even have only seldom several LUT 71f.

[embodiment 8]

Present embodiment will be introduced a structure, in this structure: the video data D00 (i that is stored in preceding second width of cloth picture of 31 li of picture memories, j, k-2) bit width and the video data D0 (i that is stored in the last width of cloth picture of 31 li of picture memories, j, bit width k-1) changes according to variation of temperature.Attention: this structure also is applicable to 1 to 7 each embodiment, but following description will be introduced the situation of this structure applications in embodiment 7.

Exactly, according to present embodiment, as shown in figure 13, in modulation-energized process part 21g, be stored in video data D00 (i, j, bit width k-2) and the video data D0 (i that is stored in the last width of cloth picture of 31 li of picture memories of preceding second width of cloth picture of 31 li of picture memories, j, k-1) bit width changes according to variation of temperature, corresponding to a lower temperature range time, and the video data D00 (i of preceding second width of cloth picture, j, k-2) bit width is extended, and the video data D0 of last width of cloth picture (i, j, k-1) bit width is reduced, and reduction is consistent with the amplification amount.Attention: control circuit 32g that is introduced after a while and control circuit 32i, for the bit width control device provides a kind of non-limiting form support.

At this moment, in order to reduce the memory capacity of picture memory 31, be stored in the video data D00 (i in the picture memory 31, j, k-2) and D0 (i, j, k-1) total bit width is restricted to a predetermined bit width (for example, 10 positions), and video data D00 (i is set, j, k-2) and D0 (bit width k-1) is so that the most accurately proofread and correct the video data D0 (i of last width of cloth picture for i, j, j, k-1).At this moment, by sub-pixel point SPIX (i, j) resulting gray scale is than the influence that is easier to be subjected to last width of cloth picture video data, this be since from the front second width of cloth picture (i, response speed j) is all lower to be caused to the grayscale transition of last width of cloth picture and sub-pixel point SPIX.Therefore, when temperature variation, video data D00 (i, j, k-2) and D0 (the most of specific addresses of bit width k-1) are distributed and also can be changed thereupon for i, j.

The response speed of group pixel SPIX changes when making the most of specific addresses of bit width distribute also to change with temperature thereupon, last width of cloth picture gamma correction circuit 37g corresponding to present embodiment, according to the temperature variation of current sub-pixel point SPIX change video data D00 (i, j, k-2) and D0 (i, j, the address assignment of bit width k-1) therefore when being in lower temperature range, will enlarge the video data D00 (i of preceding second width of cloth picture, j, bit width k-2).As a result, under condition, no matter variation of temperature, the address assignment of possible holding position width is constant suitable, makes that (i, j k-1) become possibility to pinpoint accuracy ground correcting video data D0.Therefore, can prevent superpower or weak brightness more closely.

For example, just as aforesaid example, when total bit width of front second width of cloth picture and last width of cloth picture is 10 positions, in normal temperature range, video data D00 (the i of preceding second width of cloth picture, j, bit width k-2) are set to 4 positions, and temperature subnormal temperature scope then bit width is set to 5 positions.

[embodiment 9]

By the way, each above-mentioned embodiment has introduced when the numerical value that obtain and has been stored in example among the LUTs71 (71e 71f), but this structure is not limited only to this.As described above, appearance superpower or weak brightness can worsen display quality, can be designed to like this, that is: bigger than resulting numerical value gray scale indication is written into LUT 71, so that prevent the appearance of superpower brightness effectively, and in the time must proofreading and correct last width of cloth picture video signal DAT0, last width of cloth picture gamma correction circuit 37 (37 to 37f) is proofreaied and correct gray scale, makes it bigger than resulting numerical value.

In this structure, compare with the stored situation of the numerical value of gained, further second width of cloth picture makes just to prevent beyond the question that superpower brightness from occurring to the reinforcement of the grayscale transition of last width of cloth picture from the front in inhibition.

In addition, the treatment for correcting of being carried out by last width of cloth picture gamma correction circuit can be changed according to the type of image.Attention: this structure also is applicable to 1 to 8 each embodiment, but following description will be introduced the situation that aforementioned structure is applied to embodiment 6.

Particularly, except that embodiment 6, comprise one corresponding to the modulation-energized process part 21h of present embodiment and measure circuit 41, as shown in figure 14, be used to measure image type, and last width of cloth picture gamma correction circuit 37h changes: (i) correcting video data D0 whether; (ii) correcting video data D0a is according to by measuring the given measurement result of circuit 41, when the combination of certain preceding second width of cloth picture video data D00 and last width of cloth picture video data D0 is transfused to.

Particularly, comprise a lot of and the corresponding to LUT 71h of predetermined temperature range separately corresponding to the last width of cloth picture gamma correction circuit 37h of present embodiment.As at LUT 71, be stored among each LUT 71h corresponding to the resulting respective value of image type.At this moment, the counting circuit 72h of last width of cloth picture gamma correction circuit 37h from LUT71h, choose one with from measuring the consistent LUT71h of information that circuit 41 is provided, this mentioned in interpolation calculation.

At this moment, as what introduce previously, in the time must proofreading and correct last width of cloth picture video signal DAT0, last width of cloth picture gamma correction circuit 37h proofreaies and correct gray scale and makes that the resulting numerical value of its numeric ratio is bigger, when corrected numerical value is configured to when more much bigger than resulting numerical value, undoubtedly this just might prevent superpower brightness, but response speed can reduce.Therefore, numerical value after the correction and the difference between the resulting numerical value can be set, prevent that response speed from reducing widely so that suppress the appearance of superpower brightness.Yet the special-purpose numerical value of aforementioned difference can change owing to image type changes.Therefore, under difference is fixed constant situation, when a variety of image types are transfused to, are unusual difficulties to the numerical value of all types of image setting special uses

On the other hand, corresponding to present embodiment in modulation-energized process part 21h, the difference of proofreading and correct between numerical value and the resulting numerical value changes along with image type.Therefore, the image of type whatsoever, fast-moving image or move slowly that image can be transfused to no matter just, prevent response speed reduce greatly in and the appearance that suppresses superpower brightness is possible.

In addition, when image type is when moving slow image, this can expect: even last width of cloth picture gamma correction circuit 37h does not proofread and correct last width of cloth picture video signal DAT0, response speed will can not brought superpower or weak brightness inadequately yet, and the last width of cloth picture gamma correction circuit 37h in the present embodiment stops last width of cloth picture video signal DAT0 is proofreaied and correct.The result, this response speed that just might prevent image display 1 reduces, do not bring following phenomenon: when preventing by slowly moving and not enough and the superpower or weak brightness that cause of response when occurring, although image is shown, but by last width of cloth picture gamma correction circuit 37h, grayscale transition is suppressed.

[embodiment 10]

Present embodiment will be introduced a kind of structure, in this structure, be stored in the video data D00 (i of preceding second width of cloth picture of 31 li of picture memories, j, k-2) bit width and the video data D0 (i that is stored in the last width of cloth picture of 31 li of picture memories, j, bit width k-1) changes according to the difference of image type.Attention: this structure also is applicable to 1 to 9 each embodiment, but following description will be introduced the situation of this structure applications in embodiment 7.

Exactly, in the modulation-energized process part 21i of present embodiment, as shown in figure 14, control circuit 32i is according to by measuring the given testing result of circuit 41, change video data D00 (i, j, bit width k-2) and the video data D0 (i that is stored in the last width of cloth picture of 31 li of picture memories of preceding second width of cloth picture that is stored in 31 li of picture memories, j, bit width k-1).When the type of image is the fast moving image, the video data D00 of preceding second width of cloth picture (bit width k-2) will be extended for i, j, and the video data D0 of last width of cloth picture (i, j, bit width k-1) are reduced, and reduction is consistent with the amplification amount.

At this moment, in order to reduce the memory capacity of picture memory 31, be stored in the video data D00 (i in the picture memory 31, j, k-2) and D0 (i, j, k-1) total bit width is restricted to a predetermined bit width (for example, 10 positions), and video data D00 (i is set, j, k-2) and D0 (bit width k-1) is so that the most accurately proofread and correct the video data D0 (i of last width of cloth picture for i, j, j, k-1).At this moment, by sub-pixel point SPIX (i, j) resulting gray scale is than the influence that is easier to be subjected to last width of cloth picture video data, this be since the fast moving image by deep situation under, second width of cloth picture causes to the grayscale transition of last width of cloth picture from the front.Therefore, when image type changes and the movement velocity predicted when changing, video data D00 (i, j, k-2) and D0 (most of specific addresses distribution of bit width k-1) also can change thereupon for i, j.

The response speed of group pixel SPIX changes when making the most of specific addresses of bit width distribute also to change with image type thereupon, corresponding to the last width of cloth picture gamma correction circuit 37i of present embodiment, change video data D00 (i, j according to the type of present image, k-2) and D0 (i, j, the address assignment of bit width k-1), therefore, when image type is the image of fast moving, will enlarge video data D00 (i, j, bit width k-2) of preceding second width of cloth picture.As a result, under condition, no matter the variation of image type, the address assignment of possible holding position width is constant suitable, and the higher degree of accuracy of feasible employing is come correcting video data D0, and (i, j k-1) become possibility.Therefore, can prevent superpower or weak brightness more closely.

[embodiment 11]

Each following embodiment will introduce a kind of structure, in this structure, even be in grayscale transition under the situation of minimal gray, still can improve the response speed of pixel.

More particularly, as shown in figure 15, the modulation of present embodiment-energized process part 21j comprises: as a circuit that is used for R, picture memory (a non-limiting example of support storage device) 131, be used to store corresponding to a video data picture, that affact sub-pixel point SPIX, just upgrade up to next width of cloth picture; Memorizer control circuit 132, be used for writing the video data of current picture FR (k) and from picture memory 131, reading the video data D0 (i of last width of cloth picture FR (k-1) toward picture memory 131, j, k-1), so that this video data D0 (i, j, k-1) output is as last width of cloth picture video signal DAT0; And modulation processing section (a non-limiting example of support storage device) 133, be used to proofread and correct the video data of current picture FR (k), so that strengthen grayscale transition from current picture to last width of cloth picture, and the video data D2 (i behind the output calibration, j is k) as the vision signal DAT2 after proofreading and correct.

In addition, according to present embodiment, pixel array 2j (participation Fig. 2) is set acts on sub-pixel point SPIX so that have a ratio, be imported into the bigger γ characteristic of γ that the video data D of terminal T1 is had, modulation-energized process part 21j comprises a BDE (bit depth expansion) circuit, it has: a gamma transformation circuit 141, be used for carrying out according to acting on sub-pixel point SPIX, the gamma transformation that is imported into the video data D of entry terminal T1 and carries out is so that be shown in the image display, image with big γ characteristic is transformed into video data Da with video data D; A greyscale transformation circuit 142, be used for that compressed video data can be instructed to out, possible numerical range, have the video data Db of identical bits width so that generate, and can describe a numerical value that is lower than the black level of video data Da and is higher than the white level of video data Da with video data Da; A noise adding circuit 143 is used for adding video data Db to producing circuit (the non-limiting example of noise generation device) 144 noises that generated by noise, so that output video data Db; And an intercepting circuit 145, be used to clip by the video data of noise adding circuit 143 outputs than low order, so that reduce the bit width of video data.

(i, j k) are imported into modulation processing section 133 and memorizer control circuit 132, as the video data of current picture FR (k) to the D1 that is exported by intercepting circuit 145.Attention: gamma transformation circuit 141 and greyscale transformation circuit 142 are equivalent to a non-limiting example of supporting the tone reversal device, and noise adding circuit 143 and intercepting circuit 145 are equivalent to a non-limiting example of supporting the noise adding set.In addition, in the present embodiment, sub-pixel point SPIX (1, j), SPIX (4, j) ... show R, so, video data D (1, j, k), D (4, j, k) ... be imported into entry terminal T1.

In the present embodiment, for display image on image display, the video data D with γ=2.2 characteristics is imported into terminal T1 as an ordinary video signal, and the γ characteristic of pixel array 2j is set, and makes γ=2.8.Exactly, gamma transformation circuit 141 generates the video data Da with γ characteristic the same with the γ characteristic of pixel array 2j, and or rather, for display image on image display, video data Da has γ=2.8 characteristics.In addition, the gamma transformation circuit 141 of present embodiment is transformed into video data the video data Da with wideer bit wide for fear of the appearance of the error that is caused by gamma transformation.For example, the vision signal of 8 positions is imported into entry terminal T1 as the ordinary video signal, in order to meet each color, and 141 in gamma transformation circuit, the video data D of 8 positions is transformed into 10 vision signal Da.

In addition, as shown in figure 16, video data Da numerical range A1 that can be instructed to out, possible of greyscale transformation circuit 142 compressions is so that be transformed into the narrower numerical range A2 of scope to numerical range A1.In addition, when video data Db can represent from L10 to L13, numerical range A2 just transformed to gray scale L12 from gray scale L11 and is arranged to: L10＜L11,12＜L13.For example, in the present embodiment, each video data Da and Db are 10 positions, and L1=L10=0, and L2=L13=1023, then aforesaid L11 and L12 for example are set to 79 and 1013.Attention: in video data Da, minimal gray (L1) expression black, and maximum gray scale (L2) expression white.

At this moment, noise produces the such random noise of circuit 144 outputs, make false contouring figure can not occur in the shown image of pixel array 2j, and the average of this random noise that is output is 0.In addition, when the maximal value of noise data was too big, just there was a kind of possibility in this, that is: noise image may be identified by the user of image display 1j, therefore the maximal value of noise was set so that noise image is not identified.

In the present embodiment, (i, (k), by 10 bit representations, and the intensity of noise data is set at ± 7 positions video data Db j), that be imported into noise adding set 143 for i, j to act on sub-pixel point SPIX.Attention: except the intensity of institute's generted noise, the noise that noise produces among circuit 144 and the embodiment 1 produces circuit 35, in the same way configuration.

In addition, intercepting circuit 145 is from having 10 positions, come self noise to produce the video data that circuit 144 exported to clip low effective 2 positions, and the video data that generates 8 positions as video data D1 (i, j, k).Therefore, in picture memory 131, (memory block k) is set to for i, j: (i, j is k) to there being 8 positions for single video data D1 to be used to store the video data D1 of current picture FR (k).

Therefore, might reduce the figure place of the video data of crossing by the processing of circuit that is positioned at after the intercepting circuit 145, make it with situation about showing at image based on the video data D before the intercepting under do not have evident difference, prevent from the shown image of pixel array 2j, noise image and false contouring figure to occur.

At this moment, the user of image display 1j identifies the noise that is added from the following aspects: (i) the observed gray scale and the gray scale (calibration) of neighboring pixel point have great difference; The brightness of (ii) observed gray scale be and object brightness (error) between much difference is arranged.Usually, well-known: as, approximately to be that calibration limit corresponding to 5%, one permission of white luminance approximately is to be shown 5% of gray scale as the extent of the error of 1, one permission of image display in a zone based on the clear demonstration of 100ppi.

When the gray scale of pixel SPIX increases according to the x gray scale, will carry out calculating: the penetrability of pixel is how to increase with number percent along with the brightness (penetrability before increasing gray scale) of periphery.According to result of calculation, be that γ=2.8 and video data Db are that when x got 32 to 48 gray scales, the calibration value of nearly all gray scale all was within the aforesaid tolerance limit under the situation by 10 bit representations in the γ characteristic of pixel array 2j.Similarly, when the display gray scale of pixel is increased by x gray scale direction, carry out and calculate: the penetrability of pixel is how to increase with number percent along with initial penetrability (penetrability before increasing gray scale).According to result of calculation, be that γ=2.8 and video data Db are that when x got 32 to 48 gray scales, the calibration value of nearly all gray scale all was within the aforesaid tolerance limit under the situation by 10 bit representations in the γ characteristic of pixel array 2j.As a result, when noise intensity between between 32 to 48 gray scales time, the calibration value of nearly all gray scale all is lower than the limit of permission, just might prevent that therefore the user from feeling the obvious deterioration of display quality.

Thereby the imagination user watches image across the distance that can see each pixel clearly, and better distance setting is in 2 to 3 pixels (6 to 9 sub-pixels) scope, and calibration and error precision all are no more than 5%.At this moment, when noise data is normal distribution veritably, 32 to 48[gray scales] * 6 ^(1/2)To 9 ^(1/2)=80 to the 144[gray scale].Therefore, even the steady noise of 7 positions is added in the time series mode, that is to say, add steady noise in the time series mode, so that bit wide is lacked 3 positions than video data Db offer, noise image just can not be identified by the user of image display.

Generally at this moment: even when the pixel size becomes bigger, the user can watch the distance of image can therefore not increase.Therefore, when the pixel size became bigger, it is littler that the proof strength of noise data will become.So, in gray scale from 1 to 144 (in 7 positions) numerical range, as the greatest measure of the absolute value of noise data, numerical range that adopted, preferably is 48 to 80 gray scales in most of image displays 1, and preferably numerical range is arranged to 63 gray scales (5 positions).

In this structure, (i, j k) are corrected the video data D1 of current picture FR (k), make modulation processing section 133 strengthen grayscale transition, so just might improve the response speed of sub-pixel point SPIX from last width of cloth picture FR (k-1) to current picture FR (k).

In addition, in aforesaid structure, pixel array 2j can be set, so that its γ characteristic that has is bigger than the γ characteristic that is imported into the video data D on the terminal T1, and, the video data D that is input on the terminal T1 is transformed into the video data Da with bigger γ characteristic by gamma transformation circuit 141.In addition, greyscale transformation circuit 142 converts video data Da to video data Db gray scale, that gray scale can be shown based on the black level that is lower than video data Da; Subsequently, the grayscale transition of modulation processing section 133 reinforcements from last width of cloth picture to current picture.

In this structure, as shown in figure 17, because gamma transformation makes to be more prone to blackening by the shown gray scale of sub-pixel point SPIX.And because gamma transformation, wherein predetermined gray scale (gray scale L10 to L11 as shown in figure 16) is designated as the black level that gray-scale intensity is lower than video data D.

In other words, in the present embodiment, at least in the display gray scale zone, the γ characteristic is provided with to such an extent that to compare the γ characteristic of the video data of being imported bigger.And, in the present embodiment,, be provided with the γ characteristic in the zone to such an extent that more senior general is more suitable in order to strengthen the transition of low gray scale.

Therefore, modulation processing section 133 can be utilized gray scale L10 to L11, and when grayscale transition was not reinforced, its gray-scale intensity was more much lower than black level, so must strengthen grayscale transition.

The result, be different from and be not reinforced black level video data D2 calibrated under situation indication in grayscale transition and be reinforced with grayscale transition that calibrated video data D2 is identical so that the structure of gray scale reduction under the situation, this just might further strengthen grayscale transition, so that reduction gray scale, thereby the response speed of raising sub-pixel point SPIX.

At this moment, in common black pattern, adopt under the situation with the liquid crystal display of vertical alignment pattern, change so that when becoming a bigger gray scale (grayscale transition is in " increase "), cause liquid crystal molecule to tilt when gray scale according to the direction that is parallel to the liquid crystal cells substrate by the electric field that acts on the inclination that voltage produced on the pixel electrode.Yet, when gray scale changes so that when becoming a littler gray scale (grayscale transition is in " decay "), liquid crystal molecule is resumed into vertical direction and arranges, and this is formed on substrate owing to the vertical alignment film, apply an acting force in vertical direction.Therefore, under the situation of using liquid crystal cells, the grayscale transition in " decay " is tending towards slower than the grayscale transition in " increase ".

Yet, with the designed modulation of aforementioned manner-energized process part 21j, further strengthen grayscale transition, the feasible response speed that might further reduce " decay " section in " decay " section.As a result, even adopt this liquid crystal cells, also might realize the image display 1j that response speed is very high.

Particularly, at low temperatures, response speed of liquid crystal is very slow, therefore is tending towards at a slow speed in " decay " section grayscale transition.Yet when being in " decay " section in grayscale transition, modulation-energized process part 21j improves response speed, and therefore modulation-energized process part 21j can be applied under cryogenic conditions better.

In addition, in the present embodiment, the BDE circuit that has noise adding circuit 143 and intercepting circuit 145 is provided at the previous stage of picture memory 131.Therefore, just might reduce the video data D1 that is stored in the picture memory 131 (i, j, data volume k) and the display quality of not obvious deterioration shown image in pixel array 2j.

In the present embodiment, be 10 positions although be imported into the bit width of noise adding circuit 143 ground video data Db, (i, j, bit width k) are reduced to 8 positions to be stored in video data D1 in the picture memory 131.Therefore, just might reduce picture memory 131 necessary memory capacity.In more detail, circuit after being arranged in intercepting circuit 145, that is: in the expanded circuit 12 and the data signal wire driving circuit 3 among Fig. 2 in storage expanded circuit 132, last width of cloth picture gamma correction circuit 137, modulation processing section 133, Fig. 2, the bit width of video data is low to moderate 8 positions from 10 potential drops.Therefore, just might be reduced to 4/5 to the lead that is used to connect them, and by lead special-purpose space also near 4/5, thereby reduce calculating total amount in the circuit.

Attention: the conversion of video data must be carried out under than higher speed.Therefore, a lot of circuit are provided and alternately carry out these circuit in order to finish the conversion of video data with the lower circuit of response speed, must to walk abreast.For this reason, when the bit quantity of video data increased, the area occupied by circuit just increased.Yet in aforesaid structure, bit width is reduced to 4/5.Thereby, different with the situation of 10 positions, even under the situation of the circuit that parallel work-flow each other is provided, might prevent that just the occupied zone of circuit from increasing.

In addition, in the present embodiment, the BDE circuit that has noise adding circuit 143 and intercepting circuit 145 is provided at the previous stage of picture memory 131 and modulation processing section 133.Therefore, it is different that this and BDE circuit are provided at the situation of next stage of modulation processing section 133, it is following unfavorable that this structure can not cause: strengthen grayscale transition as much as possible so that after superpower brightness not occurring in modulation processing section 133, the BDE circuit adds noise, makes superpower brightness be identified processing.As a result, according to aforementioned structure,, still might prevent superpower brightness although the reinforcement of the interpolation of noise and grayscale transition is carried out altogether.

Following description will further describe the result that the front is introduced, referring to Figure 28 and Figure 29 by comparing with some comparative example.

At first, as first order comparative example, it is arranged like this: omit ingredient 141 to 145, adopt the pixel array 2 that has identical γ characteristic with the video data of being imported.In this structure, shown in DATA1 among Figure 28, the 8 digital video data D (one-level tone data) that are input to entry terminal T1 do not do any correction and just are imported into memorizer control circuit 132 and modulation processing section 133.

In this case, DATA1 does not have the space that whole gray scale (for example grayscale transition between white and black) is further strengthened, so modulation processing section 133 can not fully be strengthened the transition of whole gray scale.As a result, in the shown gray scale, two region R b1 and Rc1 have just appearred, because can not strengthen grayscale transition fully, so each district all can not reduce the response speed of sub-pixel point fully in pixel array 2.

Secondly, as second level comparative example, it is arranged like this: greyscale transformation circuit 142 only is provided, and shown in DATA2 among Figure 28, the video data D that is imported is assigned to a region R a2 who is narrower than video data D, and is output.In this structure, there is the possibility that following shortcoming occurs.

Say in further detail, resulting region R a2 after the conversion is set, make: in region R a2, strengthen the response speed that can in being transfused to the four corner of video data, improve sub-pixel point by modulation processing section 133 performed grayscale transition.Therefore, just might cause sub-pixel point SPIX, and not consider the type of the video data D that is transfused to quite high speed responsive.

In other words, compare with can represent the zone of data corresponding to the bit width of distributing to DATA 2 (in this example, 8 positions), resulting region R a2 is limited after the conversion, also has remaining region R b2 and Rc2.Therefore modulation treatment circuit 133 is by utilizing region R b2 and Rc2, can strengthen from region R a2 the grayscale transition of gray scale another one gray scale in the region R a2.As a result, though under the situation of whole gray scale (for example grayscale transition is between between the upper and lower bound of region R a2) transition, might further strengthen grayscale transition by utilizing region R b2 and Rc2, thereby cause sub-pixel point SPIX with quite high speed responsive.

Yet, according to this structure, the gray scale number of being exported by greyscale transformation circuit 142 (gray scale number: the quantity of the gray scale in region R a2) than with the bit width (for example 8 positions) of video data D the quantity of the gray scale that can represent littler, therefore, display quality (quantity of gray scale, the quantity of color) worsens.

Then, as third level comparative example, it is arranged like this: bit wide changes the previous stage that the circuit (not shown) is provided at greyscale transformation circuit 142, shown in DATA 3, bit wide changes the bit width that circuit can enlarge the video data D (for example, bit wide changes circuit bit width is enlarged 10 positions from 8 positions) that is imported.In this structure, there is the possibility that following shortcoming occurs.

Say that in further detail according to this structure, the region R a3 that video data D is carried out the gray scale that conversion exports by greyscale transformation circuit 142 is a zone by obtaining after region R b3 and Rc3 are removed from the zone of the expression data width that enlarged.Yet the quantity of the gray scale that can be expressed in region R a3 surpasses the gray scale number (in this example, 256 gray scales) that the video data D that imported can indicate significantly.Therefore, different with second level comparative example, this might suppress the deterioration of display quality.

Yet, even in this structure,, just there is a kind of possibility if, might have enough gray scales in the very low side of gray scale, promptly serious display error may appear.Say that in further detail (brightness) has the log sensitivity induction range to human vision to luminous energy, so when shown image was low key tone, people's vision was sensitive more to conversion.In other words, in a dark relatively zone, when slight error occurring, error is identified by the people as the image of abnormality.

Therefore, when when the very low side of gray scale does not have enough gray scales, display error just appears.As a result, be difficult to accomplish enlarge and facilitating modulation processing section 133 to strengthen the size (size of Rb3) in the getable zone of institute in the process of grayscale transition, worsen and be very difficult so improve response speed at once and suppress display quality.Particularly,, provide noise adding set 143,, also can not avoid the appearance of some error of causing by adding noise just as present embodiment to intercepting circuit 145 according to this structure.Therefore, in a relative brighter zone (in the higher side of gray scale), identified even error does not have, also there is a kind of possibility, be that display error may seriously worsen display quality, no matter whether have enough gray scales to prepare in the lower side of gray scale.

Simultaneously, as fourth stage comparative example, it is arranged like this: as Figure 28 by shown in the DATA4, the γ characteristic of pixel array 2j is set to a bigger numerical value (such as 2.8), and gamma transformation circuit 141 is provided at the previous stage of greyscale transformation circuit 142, in this structure, might improve the response speed of sub-pixel point SPIX and can not worsen display quality.At this moment, have a kind of possibility, promptly the bit wide by the video data of the processing that circuit is processed that is positioned at greyscale transformation circuit 142 next stage may be bigger.

Say in further detail, according to this structure, by carrying out gamma transformation, might be in the lower more gray scale of a side distribution ratio third level comparative example of gray scale.For example, as Figure 17 and shown in Figure 29, compare under the situation of γ=2.8 and γ=2.2, the quantity of the gray scale of the side that gray scale is lower is extended.At this moment, in order to realize 500 contrast ratio, as shown in figure 29, making penetrability is that 0.002 gray scale is set to black level, when γ=2.2, can represent approx that the quantity of the gray scale of black (penetrability is between 0.002 to 0.006) is 40; When γ=2.8, the quantity of gray scale is 52.Therefore, under the situation of low gray scale, make γ bigger by carrying out greyscale transformation, modulation-energized process part 21j can select gray scale, makes its brightness more accurately corresponding to an input.

In addition, as shown in figure 29, be 0.002 gray scale when being set to black level when making penetrability, the quantity that is lower than the gray scale of black level under the situation of γ=2.2 is 62; Under the situation of γ=2.8, the quantity of gray scale is 112.Therefore, make γ bigger by carrying out greyscale transformation, modulation-energized process part 21j can strengthen grayscale transition more safely, the feasible response speed that might more correctly improve sub-pixel point SPIX.

Attention: the description of front has been introduced and made penetrability is the example that 0.002 gray scale is set to black level.Yet when distinguishing the priority of still frame, the gray scale that penetrability is lower is set to black level, and near the quantity of the gray scale black increases.On the contrary, when distinguishing the priority of moving image, the gray scale that penetrability is bigger is set to black level, and the quantity that is lower than the gray scale of black level increases.

In both cases, all might enlarge fully facilitate modulation processing section 133 strengthen in the process of grayscale transition the size (size of Rb4) in getable zone.Therefore, just might suppress the appearance of display error, but also might improve response speed and suppress the deterioration of display quality.Attention: in Figure 28, Rc4 is a zone corresponding to high gray scale one side, is used to strengthen grayscale transition.

Yet, different according to the structure of fourth stage comparative example with present embodiment, do not provide noise adding set 143 to intercepting circuit 145.Therefore, be positioned at circuit after the greyscale transformation circuit 142 must handle bit width extended (for example 10 bit widths) data.So this just requires picture memory 131 will have more storage capacity.In addition, must arrange pixel array 2j, make it can show image, therefore so that the expense of the expense of driver IC and similar devices increases based on the video data of the bit wide with broad (for example 10 positions).

On the other hand, according to present embodiment, in modulation processing section 21j, the noise adding set 143 that provides is positioned at the next stage of greyscale transformation circuit 142 to intercepting circuit 145.So, compare with fourth stage comparative example, might reduce by the bit width that is positioned at the greyscale transformation circuit 142 handled video data of circuit afterwards.In addition, introduce, after adding noise, cast out, thereby generate video data D1 than low order as top.

Therefore, this is with only to clip the structure of not adding noise than low order different, this might suppress the appearance of false contouring figure, even and bit wide has been lowered, still might keep display quality to make shown image can not be different from the data that are exaggerated (for example 10 positions) with bit width significantly is the image that the basis shows.Attention: in Figure 28, region R b5 and Rc5 correspond respectively to the situation of low gray scale and the situation of high gray scale, and they can be used to strengthen grayscale transition.

Ensuing description will be introduced in detail by example: when the liquid crystal cells with the vertical alignment pattern is used to common black pattern following time, the raising of response speed.That is to say: for example, general liquid crystal display has " voltage-penetrability " characteristic as shown in figure 18, and the voltage (voltage of white) that acts on the display gray scale of white standard approximately is set to 7.5V.

At this moment, when black voltage is set as 0V, might realize 1000 or higher contrast, but thorny be the resistance circuit that one of design is used for producing according to gray scale relevant voltage.Therefore, be 500 equipment in order to realize being similar to common TV, contrast approx, black voltage is arranged to be about 0.6[V] to 1.1[V].

As a comparative example, a kind of structure is introduced in following description, in this structure: the pixel array that the γ characteristic is configured to γ=2.2 shows the image of a width of cloth based on video data D, the γ characteristic of this video data D is configured to γ=2.2, and does not use gamma transformation circuit 141 and 142 couples of video data D of greyscale transformation circuit to carry out conversion.In this structure, " gray scale-voltage " characteristic of the data signal wire driving circuit of pixel array is configured to as shown in figure 19.Attention: as mentioned above, when black level was enhanced, thorny was resistance circuit of design.So under the situation of γ=2.2, black level is set to 1.1[V as shown in figure 19].

At this moment, the pixel array 2j corresponding to present embodiment is set, make γ=2.8, and " gray scale-voltage " characteristic of data signal wire driving circuit 3 is configured to as shown in figure 20.Here, pixel array 2j is set makes γ=2.8, so just might be provided with black voltage very lowly and do not bring any design problem, this situation with γ=2.2 be different.Therefore, in the example of Figure 20, for example, can be set to 0.8[V] by the minimum voltage that data signal wire driving circuit 3 can be employed.Attention: in this case, this structure has realized about 900 contrasts.

In addition, gamma transformation circuit 141 and greyscale transformation circuit 142 are transformed into video data Db to video data D, and corresponding to the conversion of present embodiment as shown in figure 21, data signal wire driving circuit 3 is used the voltage corresponding to each video data Db as shown in the figure.

In the present embodiment, in modulation processing section 133, do not do any correction, just as show a static image export the video data D1 of current picture FR (k) (i, j is under situation k), as video data D (i, j is when k) representing black level, from the video data Db (i of greyscale transformation circuit 142 outputs, j, k) be 79 gray scales, and data signal wire driving circuit 3 affact sub-pixel point SPIX (i, voltage j) is 1.09[V].At this moment, 0 greyscale video data D (i, the j that crosses when 133 output calibrations of modulation processing section, k), so that when " decay " of grayscale transition section was enhanced to grayscale transition topnotch and counts, data signal wire driving circuit 3 was with a 0.8[V] voltage affact sub-pixel point SPIX (i, j) on.After this manner, in the process that grayscale transition is strengthened, might use the lower voltage of the black voltage of a ratio under the situation that grayscale transition is not reinforced, therefore, this just might improve sub-pixel point SPIX (i, response speed j).

Similarly, in the present embodiment, modulation processing section 133 do not do any correction just export the video data D1 of current picture FR (k) (i, j is under situation k), as video data D (i, j k) during the white standard of expression, is 1013 gray scales from the video data Db of greyscale transformation circuit 142 outputs, and data signal wire driving circuit 3 affact sub-pixel point SPIX (i, voltage j) is 6.5[V].At this moment, the video data D2 (i that crosses when 133 output calibrations of modulation processing section with maximum gray scale, j, k), so that when " rising " of grayscale transition section is enhanced to grayscale transition topnotch and counts, data signal wire driving circuit 3 is with a 7.5[V] voltage affact sub-pixel point SPIX (i, j) on.After this manner, in the process that grayscale transition is strengthened, might use the higher voltage of the black voltage of a ratio under the situation that grayscale transition is not reinforced, therefore, this just might improve sub-pixel point SPIX (i, response speed j).

Ensuing description has provided an example: transient process from last width of cloth picture FR (k-1) to current picture FR (k), video data D from 0 grey scale change to 255 gray scales.In this case, according to the structure of comparative example, as shown in figure 21,0 gray scale is exactly full tonal range to 255 gray scales, therefore just might strengthen grayscale transition again.Like this, corrected video data D2 (i, j, k-1) and be provided to data signal wire driving circuit D2 (i, j are respectively 0 gray scale and 255 gray scales k), and affact sub-pixel point SPIX (i, j) voltage on is from 1.1[V] change to 7.5[V].

Therefore, shown in the dotted line of Figure 22, because the step response characteristic, (i, brightness j) can meet white standard to allow about 3 width of cloth pictures (about 0.03 second) sub-pixel point SPIX.Attention: the step response characteristic is a kind of like this phenomenon, that is: the electric capacity of liquid crystal layer changes according to the response of liquid crystal, so that the variation that is applied on the liquid crystal is lowered, makes response seem slower.This phenomenon is electric discharge phenomena veritably, so at high temperature can be observed.

On the other hand, in the present embodiment, as shown in figure 21, from the video data Db of greyscale transformation circuit 142 output (i, j, k-1) and Db (i, j k) are 79 gray scales and 1013 gray scales respectively.Therefore, for example, (i, j k) are transformed into gray scale corresponding to 1023 gray scales to modulation processing section 133, strengthen grayscale transition thereby have no obstacle ground with video data D2 current picture FR (k), corrected.Like this, shown in Figure 22 solid line, (i, brightness j) reaches white standard (16.7 milliseconds) to sub-pixel point SPIX in same picture.

By the way, in liquid crystal display, when wavelength shift, even same voltage affacts on the pixel electrode of liquid crystal cells, penetrability also can change.Therefore, in order to unify R aspect the brightness, the sub-pixel point SPIX of G and B, the voltage that should affact on the sub-pixel point SPIX is mutually different.At this moment,, make R when the data signal wire driving circuit 3 of pixel array 2j is so designed, G and B according to corrected video data D2 (i, j, ^*) and affact each sub-pixel point SPIX (i, j) relation of the voltage between the two is set to when having nothing in common with each other, the circuit structure of data signal wire driving circuit 3 will be very complicated.

Yet in the present embodiment, gamma transformation circuit 141 and greyscale transformation circuit 142 are prescribed carries out different conversions.Therefore, in the data signal wire driving circuit 3 of pixel array 2j, although each color be in the same way, according to corrected video data D2 (i, j, ^*) and affact each sub-pixel point SPIX (i, j) relation of the voltage between the two is provided with, just might be by causing suitably each R of conversion of gamma transformation circuit 141 and greyscale transformation circuit 142, the gray scale of G and B suitably is provided with the brightness of each sub-pixel point.

After this manner, in the present embodiment, gamma transformation circuit 141 is carried out the relevant gamma transformation that is input to video data on the entry terminal T1, that affact each sub-pixel point, so that this video data is transformed into video data Da (i, j, k), be used for showing characteristic with big γ characteristic at an image display.In addition, greyscale transformation circuit 142 compressed video data Da (i, j, possible numerical range k), so that generate and video data Da (i, j k) has video data Db (i, the j of identical bits width, k), be lower than video data Da (i, j, the numerical value of black level k) so that can express one.(i, j in the time of k), have added noise being transformed into video data Db.Subsequently, clipped than low order, thus obtain video data D1 (i, j, k).

In addition, in order to strengthen grayscale transition from last width of cloth picture to current picture, modulation processing section 133 correcting video data D (i, j, k).Therefore, even requiring grayscale transition to become under the situation of minimum gray scale, be to realize a drive unit that can improve the image display of pixel response speed.

[embodiment 12]

As shown in figure 23, except the structure of embodiment 11,21k comprises a FRC circuit 146 according to present embodiment modulation-energized process part, is defined in: (i) intercepting circuit 145; (ii) between picture memory 131 and modulation processing section 133 these two parts, this FRC circuit 146 is similar with the FRC circuit 38 among the embodiment 2.

As in embodiment 2, according to video data D (i, j, k), FRC circuit 146 changes the least significant bit (LSB) of the video data of being exported by intercepting circuit 145, on the basis of predetermined pattern, then this data output that has changed least significant bit (LSB) as video data D1 (i, j, k).Being provided with pattern makes the numerical value of the position of being clipped by intercepting circuit 145 be equivalent to form the mean value of the numerical value of pattern.

In this structure, as in embodiment 2, because FRC circuit 146, video data D (i, j, least significant bit (LSB) k) based on a pattern and change, the numerical value of the position of being clipped by intercepting circuit 145 in this pattern is equivalent to form the mean value of the numerical value of pattern.Thereby (i, average brightness j) is with consistent by the indicated brightness of the video data of intercepting circuit 145 before intercepting might to make sub-pixel point SPIX.

Attention: group pixel SPIX (i, response speed j) is so low, so that sub-pixel point SPIX (i, j) can not be according to corrected video data D2 (i, j, variation k) and when changing, (i, average brightness j) is not the numerical value of wanting just to sub-pixel point SPIX.Yet, according to present embodiment, in modulation-energized process part 21k, the position that FRC circuit 146 is changed is video data D (i, j, least significant bit (LSB) k), and the grayscale transition of modulation processing section 133 reinforcements from last width of cloth picture FR (k-1) to current picture FR (k).Therefore, modulation-energized process part 21k can have no obstacle ground bundle pixel SPIX (i, average brightness j) are set to the above-mentioned numerical value of wanting.

At this moment, by each sub-pixel point SPIX (i, j) shared zone is very little, and spatial resolution and brightness resolution are set to and approach or exceed under people's the situation of the visual identity limit, promptly suppose seeing on the distance that to see each pixel clearly under the situation of pel array 2, even noise adding circuit 143 has been added a bit wide than video data D (i in the time series mode, j, steady noises k) will be narrower, about 3 positions, noise image also can not be identified by the user of image display.The example of this image display comprises: 15 inches XGA (enhancing graphic array) display and similar equipment.In this case, (i, j) distance between (the best) is set to about 300 μ m to sub-pixel point SPIX.

Yet, in such structure, steady noise is added in the time series mode, when the spatial resolution of pixel array 2j and brightness resolution exceed the aforesaid limit, this just has a kind of possibility, that is: shown image is in (for example, specific brightness or specific motion state) under the specific conditions in pixel array 2j, and perhaps noise image can be identified by the user of image display 1k.The example of this image display comprises: 15 inches VGA display and similar equipment.

On the other hand, according to present embodiment, in modulation-energized process part 21k, (least significant bit (LSB) k) changes 146 couples of video data D1 of FRC circuit for i, j.Like this, when modulation-energized process part 21k is applied in this type of image display, might be able to prevent that noise image from being identified by the user, therefore, situation about being added in the time series mode with steady noise by comparison, this just can improve the outward appearance display quality of image display 1k.

[embodiment 13]

By the way, in embodiment 11 and 12 explanation: by noise adding circuit 143 be added to video data D (i, j, ^*) on noise be carried out in the time series mode fixing, for sub-pixel point SPIX (i, j), always the noise of identical numerical value add to video data D (i, j, ^*) on.On the other hand, present embodiment will illustrate: by noise adding circuit 143 be added to video data D (i, j, ^*) on noise be to change in the time series mode.Attention: this structure also can be applied in embodiment 11 and 12.To introduce the situation that is applied to embodiment 11 about the described structure of Figure 15 below.

Or rather, in the modulation-energized process part 21m of present embodiment, provide a noise of fully arranging in the same way with the same quilt of noise generation circuit 35b of embodiment 3 to produce circuit 144m, be used for replacing noise and produce circuit 144, and noise produces the noise that circuit 144m generation changes in the time series mode.

According to present embodiment in modulation-energized process part 21m, by noise adding circuit 143 add to video data D (i, j, ^*) on noise be to change in the time series mode.Like this, as embodiment 3, even modulation-energized process part 21m (for example is applied to an image display, 20 inches VGA display, 40 inches XGA display and similar equipment), wherein: the limit that the spatial resolution of pixel array 2j and brightness resolution can be discerned well below human vision, and each sub-pixel point SPIX (i, j) can be discerned by the user of this image display, just there is a kind of possibility, that is: can prevent that noise image from being identified by the user, compare this with the situation that steady noise is added in the time series mode and just make that the outward appearance display quality that improves image display 1m will become possibility.

By the way, in order to show stable, as not have a flicker and noise rest image, according to present embodiment, as the video data D0a of last width of cloth picture FR (k-1) (i, j, k-1) with the video data D1 of current picture FR (k) (i, j is when k) the predefined threshold value of the diversity ratio between is little, modulation-energized process part 133 will not strengthened grayscale transition, and output not with the video data D1 of picture FR any correction, current (k) (i, j, k).

In this case, threshold value being set is varying width in order to adapt to a noise and to change in the time series mode.Varying width when more particularly, threshold value will be equal to, or greater than this noise and changes in the time series mode; Threshold value is provided with too for a short time, so that: even without the reinforcement grayscale transition, because sub-pixel point SPIX (i, j) response speed deficiency, and cause inappropriate grayscale transition not to be identified.For example, suppose aforesaid numerical value, that is: (i, j k) are 10 positions, and noisiness is ± 7 positions, and intercepting circuit 145 is clipped 2 positions, and then threshold value is set to 32 gray scales (=2 as video data D ^(7-2)).

After this manner, threshold value is set to a numerical value, the varying width that this numerical value is equal to, or greater than noise when changing in the time series mode.Therefore, when showing a rest image, even noise causes video data D (i, j, k) great changes will take place, causes occurring grayscale transition, and modulation processing section 133 will not strengthened grayscale transition, and output not with the video data D1 of picture FR any correction, current (k) (i, j, k).After this manner, just as in Example 3, only causing under the situation of grayscale transition by adding noise data, the modulation processing section 133 of embodiment 13 is not strengthened grayscale transition; Suppose to have only by adding noise data and allowing FRC circuit 146 change least significant bit (LSB) just can cause grayscale transition, so, do not strengthen grayscale transition by FRC circuit 146 being added to 133 of modulation processing section that obtain in the structure of embodiment 13.Therefore, the grayscale transition that is caused by noise is not reinforced, and this just might prevent such shortcoming: because the grayscale transition that noise causes, noise image is identified by the user.

In addition, under ground the same situation with present embodiment, by noise adding circuit 143 be added to video data D (i, j, ^*) on noise with timing variations, that is to say that working as the distance of watching image (allows the user of image display can see each sub-pixel point SPIX (i clearly at one than the distance of watching image in embodiment 11, j) distance) to lack, then more need to be provided with a greatest measure by the absolute value of the noise data of noise generative circuit 144 generations, this numerical value is no more than 32 gray scales.

[embodiment 14]

The maximal value that description has before this been introduced by the noise generation noise data that circuit generated is the example of constant.Yet (k) gray scale of representative changes and the structure that changes the maximal value that present embodiment will be introduced a kind of noise data for i, j according to the video data D that is imported into entry terminal T1.Attention: this structure can be applicable to embodiment 11 to 13.Will introduce the situation of aforesaid structure applications below, referring to Figure 24 in embodiment 11.

Exactly, according to present embodiment, in modulation-energized process part 21n, produce the similar noise of circuit 35c with noise among the embodiment 3 and produce the noise that circuit 144n is used to replace as shown in figure 11 and produce circuit 144, noise produces the intensity that circuit 144m can change the noise data that is output.And, as embodiment 4, also provide gray scale to measure part 39, be used to detect video data D (i, j, the intensity of display gray scale k), and the order noise produces circuit 144n according to the suitable noise of testing result output.

In this structure, as in embodiment 4, when the mean value of video data D in the block is very big, the very little so that noise image of the relative intensity of noise that is to say: when can be identified by the user hardly, even the relative intensity of noise is than bigger under the very little situation of mean value, the maximal value of noise is set to very big.And, when the mean value of video data D is very little, the very big so that noise image of the relative intensity of noise that is to say: when can be identified by the user, unless the intensity of noise is set up must be than littler under the very big situation of mean value, otherwise noise image will be identified by the user, and the maximal value of noise is set to very little.The result, as embodiment 4, the mean value regardless of the brightness of block all might be provided with the noise maximal value to such an extent that be complementary with mean value, so that can realize image display 1n, its display quality is that the display quality under the situation of fixed numbers is higher than the maximal value of noise.

Attention: different with embodiment 1 to 10, embodiment 11 to 14 has introduced such structure: (i, j k-1) store picture memory 131 into the video data D0 of last width of cloth picture FR (k-1) to have related to modulation processing section 133; The video data of current picture FR (k) is corrected so that strengthen grayscale transition from current picture to last width of cloth picture; (i, j k) are outputted as the vision signal DAT2 of correction to corrected video data D2.Yet, identical with embodiment 11 to 14, also comprise gamma transformation circuit 141 and greyscale transformation circuit 142 in this structure, as shown in figure 25, it may be arranged to like this: as in embodiment 1 to 10, last width of cloth picture gamma correction circuit (37 to 37i) is provided, and modulation processing section 133 generates the vision signal DAT2 that proofreaies and correct, by reference: (i) the corrected vision signal DAT0a that is exported from last width of cloth picture gamma correction circuit; (ii) current picture video signal DAT.Attention: Figure 25 has shown an example: by embodiment 11 and embodiment 1 are made up resulting structure.

Except structure as shown in figure 15, the modulation shown in Figure 25-energized process part 21p has comprised the last width of cloth picture gamma correction circuit 137p that is similar to last width of cloth picture gamma correction circuit 37.And, in modulation one energized process part 21p, providing a picture memory 131p and a control circuit 132p, they are similar to picture memory 31 and control circuit 32 respectively, replace picture memory 131 and control circuit 132.As in control circuit 32, control circuit 132p reads the video data D00 of preceding second width of cloth picture from picture memory 131p (k-2), and (i, j is k-2) as the vision signal DAT00 of preceding second width of cloth picture to export this video data D00 for i, j.

In this structure, as in embodiment 11, carry out gray correction, thereby improve the response speed of pixel by gamma transformation circuit 141 and greyscale transformation circuit 142.In addition, as in embodiment 1, modulation processing section 133 is strengthened grayscale transition according to the last width of cloth picture video signal DAT0 that is proofreaied and correct by last width of cloth picture gamma correction circuit 137p, so just might prevent superpower or weak brightness, thereby improve the display quality of image display 1.

Attention: aforesaid embodiment introduction be in order to the liquid crystal cells of vertical alignment pattern and general black mode example as display element, but this structure is not limited thereto.As long as display element has following characteristic and just might obtain same effect: because response speed is low, even carry out modulation to strengthen grayscale transition, in the process of the grayscale transition that in the past is carved into the previous moment second time, exist difference between actual grayscale transition and the grayscale transition of being wanted.

Yet, with vertical alignment pattern and general black pattern, be lower than " rising " section in " decay " section response speed about grayscale transition as for liquid crystal cells.Therefore, even carry out modulation strengthening grayscale transition, in the process of the grayscale transition that in the past is carved into the previous moment second time, exist difference between actual grayscale transition and the grayscale transition of being wanted, so superpower brightness will occur.Thereby, by the structure of previous embodiment, be particularly suitable for preventing the appearance of superpower brightness.

In addition, the example of aforesaid embodiment description is: modulation-excitation ingredient is by hard-wired, but this structure not only is defined in this.It can be arranged like this: whole or a part of ingredients are realized together by the collaborative hardware (computing machine) that is used for executive routine of the combinator that is used to realize aforementioned functional.For example, a computing machine that is connected to image display 1 can be realized the function of modulation-driving processing section (21 to 21p), as the device driver that drives image display 1.In addition, it can also be arranged like this: modulation-driving processing section is implemented as one on the image display 1 built-in or external conversion photographic layer, a storage medium that is used for storing software is assigned with or is transmitted by communication cable software, so that software is assigned with to impel hardware to carry out these software, in order to realize modulation-driver unit, might by rewriting program for example program curing change the operation of circuit, thereby just as modulation-energized process part operational hardware of previous embodiment.

In this case, as long as prepared the hardware that can carry out aforementioned functional, might be only according to previous embodiment, realize modulation-energized process part by driving the hardware executive routine.

Say in further detail, by adopting software, computing equipment, CPU to form or can carry out the hardware of function, the modulation that is realized in this case-energized process part, execution is stored in for example program among ROM and the RAM of memory storage, and control for example input and output circuit (not shown) of peripheral circuit, thereby realize that according to previous embodiment modulation-energized process part 21 is to 21p.

In this case, also might combine and realize modulation-energized process part by a same calculation element that is used to carry out control hardware and carries out the program code of remaining operation of hardware association that is used for the operating part operation.In detail, in aforesaid composition, can realize a ingredient equally, realize by the same calculation element that is used to carry out control hardware and carry out the program code of remaining operation of the hardware association that is used for the operating part operation is grouped together as hardware.Attention: single calculation element can the executive routine code, perhaps by the internal bus that provided on the equipment or by the interconnective many calculation elements of various communication path executive routine code jointly.

The program code itself that can directly carry out by calculation element, perhaps a program behavior is as producing the data of a program code by decompressing, and similarly function is performed as follows: program (program code or data) is stored in the storage medium, and storage medium is assigned with, perhaps in order to be assigned with, program is transmitted by wired or wireless communication paths by the transmission equipment that is used for transmission procedure, makes calling program be passed out calculation element.

Attention:, form a single burst indication of each transmission medium transmission procedure of communication path, so be transmitted by this program of this communication path by under the situation of communication path transmission procedure.In addition, it also can be arranged like this: when transmission signal sequence, for burst is superimposed on the carrier wave, the burst indication of transmitting apparatus amenable to process modulates a carrier wave.In this case, this carrier wave of receiving equipment demodulation is so that the restoring signal sequence.

In addition, perhaps it arranged like this: when transmission signal sequence, transmitting apparatus splits into packets of information with burst, as a digit data sequence.In this case, receiving equipment connects received packets of information group, thus the restoring signal sequence.In addition, perhaps it arranged like this: when transmission signal sequence, transmitting apparatus is by for example the time is cut apart someway, frequency division, code division, with a single burst and another single burst combination, so that transmission signal sequence.In this case, receiving equipment is won each burst from the composite signal sequence, thus the restoring signal sequence.Under each situation, by the communication path transmission procedure, all might obtain same effect whenever possible.

At this moment, the storage medium preferably separable (movably) that is used for distributing programs.Yet, divide after the program that distributes storage medium whether to separate that this is unimportant.In addition, if storage medium stores program, whether then be indifferent to it is rewritable (writability), whether stable.

As long as the storage medium stores program, any storage means and any file layout can be used.The example of storage medium comprises: audiotape, for example tape and cassette tape; Video disc comprises disk, for example floppy disk (registered trade mark) and hard disk, and CD, for example CD-ROM, MO, MD and DVD; Magnetic card, for example IC-card and optics magnetic card; Semiconductor memory, for example mask ROM (read-only memory) (MASK ROM) EPROM, EEPROM and flash memory FLASH ROM.As selection, storage medium can be the storer in the calculation element, for example CPU.

Notice that program code may be a sign indicating number, is used for all programmed instruction are issued calculation element.As long as there is base program (for example, operating system or routine library), by reading this program, just can be in predetermined mode by all or part of execution, all programs may be replaced with the pointer that a sign indicating number or indication calculation element read base program by all or part of.

Further, according to the program that is stored in the storage medium, its form comprises: it is the same that a kind of form and program are placed on the situation in the real storer, and the calculation element access program is so that program can be performed; Before program is placed into a real storer or be installed to a local storage medium (for example, a real storer or a hard disk) in program afterwards forever can be by a kind of form of calculation element visit; A kind of form before network or mobile memory medium are installed to program the local storage medium.And program is not restricted to the object code that compiled, but may be saved as the intermediate code that generates in source code or explanation or the compilation process.

In all cases, operate by implementation, for example compressed information decompression, code restoration (decoding), explanation, compiling, connection, perhaps operate by implementation, for example be placed in the real storer, perhaps by these processes of combination, as long as computing method make program can convert an executable form to, just might obtain same effect, no matter stored program form how in the storage medium.

As described above, a drive unit (21 to 21i) of the pairing image display of one embodiment of the present of invention (1) comprises: entry terminal (T1), be used to receive a tone data indication of the current tone of each pixel (sub-pixel point SPIX (1,1) ...); Noise adding set (for example 34,36) is used for adding noise data being imported on the tone data of entry terminal equipment, and cast out specify bit wide than low order to produce the secondary tone data; Noise generation device (for example 35 arriving 35c) is used for the generted noise data, so that the noise data of any intensity is added on the tone data adjacent one another are, as to have the same color pixel; Memory storage (for example picture memory 31) is used for the current secondary tone data of storage pixel point, is transfused to just up to next secondary tone data and upgrades; A means for correcting (for example modulation processing section 33) is used to proofread and correct current secondary tone data, according to the previous secondary tone data that reads from memory storage, simplifies by the tone transition of previous secondary tone data to the current color adjusting data

Attention: the process of being carried out by the noise adding set of rounding up may be that a rounding procedure or one cast out (clipping) process.Whether furtherly, the process of rounding up may be a selection course, be exactly to cast out according to selecting not to be to round off above a predetermined threshold value than low order.For example, in decimal system, may occur by this way: 4 or cast out, 5 or greater than 5 number rounded off (in binary system, 0 is cast out, and 1 is rounded off) less than 4 number.

Yet, when casting out process and from the aforesaid process that rounds up, chosen, just there is no need to change significant figure.Therefore, when requiring to simplify process, it is desirable that the noise adding set is cast out process generation secondary tone data by execution.

In said structure, when a tone data indication of the current tone of each pixel is transfused to, the noise adding set adds noise data being imported on the tone data of entry terminal equipment, and casts out than low order, to produce the secondary tone data.The current secondary tone data of each pixel that is produced by the noise adding set is stored in the memory storage, upgrades up to have new secondary tone data to produce just next time; A means for correcting, proofread and correct current secondary tone data, according to the previous secondary tone data that in memory storage, reads and from the current secondary tone data of noise adding set input, to strengthen from last one constantly tone data to the tone transition of the tone data of current time.

In this structure, by casting out than low order, the bit width that is kept at the secondary tone data in the memory storage is littler than the bit width of a tone data.Therefore, it is possible reducing the essential memory capacity of memory storage.In addition, the bit width of the tone data of being handled by the circuit (memory storage, one-level means for correcting or the like) that is positioned at after the signal adding set also is reduced, and this just makes and reduces the circuit size of these circuit and reduce its calculated amount to become possibility.In addition, reduce the quantity of the lead be used for connecting these circuit and reduce and also become possibility by these lead occupation space.

In addition, the noise generation device produces noise data, so that the noise data of any intensity is added on the tone data adjacent one another are, as to have the same color pixel.This structure can not generate false contouring figure, and therefore, this is different from another kind of structure, in the sort of structure: when being clipped when producing the secondary tone data than low order of a tone data, false contouring figure can occur during with the pixel display image.The result, although the bit wide of secondary tone data is littler than the bit wide of a tone data, but still can keep the display quality of the image that shows with pixel, in this case, display quality can not be different from the display quality based on a tone data image significantly.

In addition, No. one time means for correcting is strengthened the tone transition that was carved into current time from last a period of time, makes the response speed that improves pixel become possibility.At this moment, in the time of after a means for correcting is positioned at the noise adding set, noise data just is added on the data after having strengthened the tone transition.Therefore, perhaps tone data can be strengthened excessively, to such an extent as to the brightness of pixel is not to strengthen with achieving one's goal.As a result, a kind of possibility is just arranged, that is exactly: it is excessive that the excessive reinforcement of tone data may be used as brightness by the user of image display.

As selection, perhaps the tone transition can occur strengthening inadequately, to such an extent as to the brightness of pixel is weakened with achieving one's goal.As a result, have only a kind of possibility, that is exactly: it is too dark that the reinforcement of tone data may be taken as brightness inadequately.Yet, according to aforesaid structure, No. one time means for correcting is positioned at after the noise adding set, make it possible to improve the response speed of pixel, can not cause by force or cross the appearance of weak brightness owing to the noise superposition, this situation is different from a means for correcting and is positioned at noise adding set situation before.

As a result, can realize the drive unit of an image display, this equipment can improve the response speed of pixel and can reduce circuit size and reduce calculated amount, and the display quality of the image that not obvious deterioration shows with pixel.

Except aforesaid structure, also may arrange like this: noise generation device generted noise data make when each noise is added that each intensity that is added to the noise data on the tone data that acts on same pixel all is constant.

According to aforesaid structure, the intensity that outputs to a tone data of same pixel is fixed constant in the time series mode.Therefore, when rest image was shown, at every turn the data that output to pixel from means for correcting all had identical numerical value, although noise data is added to a tone data of pixel.As a result, image display can show that a width of cloth does not have flicker, do not have by the rest image that adds the caused noise of noise data

Except aforesaid structure, also may arrange like this: a tone data is by 8 bit representations, the greatest measure of the absolute value of noise data is set at 1 tone to 32 tones in such scope, for each color of R, G and B all provides noise adding set, noise generation device, memory storage and a means for correcting.

In aforementioned structure, when watch the image display that drives by drive unit across a segment distance, so that possibility is not when identifying each pixel, by adding noise data, just might the difference of the brightness of the brightness of certain pixel and that pixel adjacent between the two with this pixel be suppressed at relevant each pixel brightness 5% in.In addition, also might the difference of the brightness of the pixel of controlling by the brightness of the indicated pixel of tone data with by correcting circuit between the two be suppressed at relevant each brightness 5% in.Therefore, just might realize can color display and have an image display of very high display quality.

In addition, all is with the changeless structure of time series mode for replacing a gradation data to same pixel, can arrange like this: noise generation device generted noise data make that the noise data that adds on the tone data that acts on same pixel is big or small at random.

In this structure, the noise data that adds on the tone data of same pixel changes in the time series mode.Therefore, even watching image display and noise in the distance that can fully identify each pixel across is to immobilize and cause noise to be identified as under the situation of noise image in the time series mode, also might prevent that noise image from being identified by the user by change noise in the time series mode.As a result, just might realize the drive unit that is used to drive image display preferably.

Except aforesaid structure, can arrange like this: current one constantly the secondary tone data and the difference between the current secondary tone data be equivalent to only cause by the interpolation of noise data possible difference the time, No. one time means for correcting stops to proofread and correct current secondary tone data.

In this structure, during possible difference that current one constantly secondary tone data and difference between the current secondary tone data is equivalent to only to be caused by the noise data interpolation, No. one time means for correcting stops to proofread and correct current secondary tone data.Therefore, just might prevent such defective: a means for correcting reinforcement is reinforced the tone reversal that is caused by noise data, makes noise image identified.

Except aforesaid structure, can arrange like this: a tone data is by 8 bit representations, the greatest measure of the absolute value of noise data is arranged on one from 1 tone to 8 tones in such scope, for each color of R, G and B all provides noise adding set, noise generation device, memory storage and a means for correcting.

In this structure, the greatest measure of the absolute value of noise data is set in the aforesaid scope.Therefore, when the distance that can identify each pixel across a section is watched the image display that is driven by drive unit, by adding noise data, just might the difference of the brightness of the brightness of certain pixel and that pixel adjacent between the two with this pixel be suppressed at relevant each pixel brightness 5% in, and might the difference of the brightness of the pixel of controlling by the brightness of the indicated pixel of tone data with by correcting circuit between the two be suppressed at relevant each brightness 5% in.Therefore, just might realize can color display and have an image display of very high display quality.

Except aforesaid structure, no matter whether noise changes with sequential, perhaps can arrange like this: least significant bit (LSB) control device (for example the sampling rate control circuit 38) is provided, be used for changing according to predetermined pattern the least significant bit (LSB) of secondary tone data, make: to average resulting tone also not consistent less than the tone when the noise adding set is clipped with least significant bit (LSB) by acting on secondary tone data on the same pixel.

In this structure, even under the situation that shows a width of cloth rest image, the secondary tone data also changes in the time series mode.Therefore, even when when certain distance is watched image display, according to the motion conditions of brightness and display image, each pixel can be identified sometimes sometimes and can not be identified; In the process that shows a width of cloth rest image, when the secondary tone data immobilized in the time series mode, according to shown image, noise image perhaps can be identified, and this might prevent that noise image from being identified by the user.In addition, the variation of secondary tone data is limited to least significant bit (LSB), and such qualification makes: to average resulting tone also not consistent less than the tone when the noise adding set is clipped with least significant bit (LSB) by acting on secondary tone data on the same pixel.So,, still might prevent from the outward appearance degeneration to occur with the display quality of the shown image of pixel although the secondary tone data changes in the time series mode.As a result, just might realize being suitable for more the drive unit that drives image display.

Except aforesaid structure, can arrange like this: when current one constantly secondary tone data and difference between the current secondary tone data only was equivalent to by noise data interpolation and the possible difference that caused by the variation of the performed least significant bit (LSB) of least significant bit (LSB) control circuit, No. one time means for correcting stopped to proofread and correct current secondary tone data.

In this structure, current one constantly secondary tone data and the difference between the current secondary tone data when only being equivalent to by the interpolation of noise data and the possible difference that caused by the variation of the performed least significant bit (LSB) of least significant bit (LSB) control circuit, No. one time means for correcting stops to proofread and correct current secondary tone data.Therefore, just might prevent such defective: means for correcting is strengthened the tone reversal that is caused by noise adding set and least significant bit (LSB) control device, makes the trend that noise image is identified.

Except aforesaid structure, can arrange like this: pixel is divided into a plurality of zones, and above-mentioned drive unit comprises the noisiness control device, this device is used in each zone, a tone data that acts on pixel is averaged, and control noise generation device makes: when the mean value of a tone data was very little, the greatest measure of the absolute value of noise data was than littler under the very big situation of the mean value of a tone data.

At this moment, when adding the noise data on the tone data to when too big, noise image has the trend that is identified by the user of image display; When adding noise data on the tone data to too hour, false contouring figure will appear, and make the display quality of the image that shows with pixel worsen.And, no matter be that noise image is tending towards identified or depends on brightness of image.Greatest measure at the absolute value of noise data is under the situation of constant, when conversion is very little, or rather: when very low brightness was shown, the relative intensity of noise data was than bigger under the very big situation of tone data, so noise image will have identified trend.As a result, when greatest measure immobilizes, under the situation that image is very bright and image is very dark, for fear of bringing any trouble, maximal value must be set, so can not be arranged to maximal value can be applicable to the two situation simultaneously.

On the other hand, according to aforesaid structure, the greatest measure of the absolute value of the noise data that is generated by the noise generation device changes according to the mean value of a tone data.Therefore, for the image that is being shown, be that invariable situation is different with maximal value, just might be arranged to a suitable numerical value to maximal value, so might realize having the very image display of high display quality.

Further, in aforementioned structure, affact each zone institute and comprise a tone data on the pixel by on average, so that the maximal value of the absolute value of noise data is set according to this mean value.Therefore, just might prevent following defective: although the tone of certain pixel is very different with the tone of surrounding pixel point, for this pixel, maximal value is provided with according to tone, so noise image just has identified trend.

Except aforesaid structure, can arrange like this: the vision signal of being made up of a tone data that is imported into entry terminal is by splitting into image a plurality of block of cells and each block of cells coding being obtained, and the zone is equivalent to these block of cells.

In this structure, the zone is equivalent to a unit in the encoded video signal process, and (the corresponding size in zone is counted as a unit of image; Perhaps make noise that the trend of being found out be arranged, because it is exactly a unit in the encoded video signal process) corresponding to such size.Therefore, even in the numerical range conversion of carrying out relevant vision signal, so that (for example show one based on the image of the vision signal of having carried out the numerical range conversion, amplify original signal so that display image, in the liquid crystal display of high definition, just show such image based on the original signal of amplifying), just might prevent aforesaid defective.

Except aforesaid structure, can arrange like this: memory storage is not only stored current secondary tone data but also the secondary tone data of storage previous moment, up to next new data more just constantly, above-mentioned drive unit (for example comprises the secondary means for correcting, last width of cloth picture arrangement for correcting grey scale 37 to 37i), be used to proofread and correct secondary tone data by the previous moment of a means for correcting submission, when the combination of the secondary tone data in preceding second moment of being stored by memory storage and the secondary tone data in the previous moment is a predetermined combination, make the secondary tone data of previous moment approach the secondary tone data in preceding second moment.

In this structure, when the combination of the secondary tone data in preceding second moment of being stored by memory storage and the secondary tone data in the previous moment is a predetermined combination, the secondary tone data of the previous moment of being submitted to by means for correcting is corrected, so that make it approach the secondary tone data in preceding second moment.Therefore, when the tone transition that in the past is carved into previous moment second time is the tone transition of being scheduled to, does not carry out the situation of any correction with the secondary means for correcting and compare, just might compress by the performed many corrections of means for correcting.

The result, for example carry out correction in an identical manner by a means for correcting when the tone transition that in the past is carved into previous moment second time, as the situation that in usual correction, is similar to " decay-rising " or " rising-decay ", just might suppress the appearance of following phenomenon: comprehensive superposition effect (i) is in the process of the tone transition that in the past is carved into previous moment second time, and the response of pixel is insufficient; (ii) strengthen by a performed tone transition of means for correcting, the tone that causes the pixel current time superpower brightness consequently occurs or crosses weak brightness with inconsistent by the indicated tone of current secondary tone data.

As a result, just might improve the display quality of image display.In addition, storing device for storing be secondary tone data without the previous moment of a correction, so the error that is caused by a performed correction of means for correcting can be by superposition or accumulation, this is different from the sort of situation: what wherein store is the secondary tone data that has been corrected.Therefore, even when adopting relative size circuit very little and that precision is very low to realize once with the secondary means for correcting, this structure can not cause dispersing or vibration pixel tone benchmark control.As a result, just might realize having the very image display of high display quality by adopting the less relatively circuit of circuit size.

Further, be stored in the memory storage up to the next one constantly data adopt the secondary tone data of the previous moment that can upgrade, its bit wide perhaps bit wide with the secondary tone data of current time is consistent.Yet, reduce circuit size by the situation of special requirement under, except aforesaid structure, also can arrange like this: bit wide adjusting gear (control circuit 32g for example is provided, 32i), be used to limit the sum of current time secondary tone data bit wide and previous moment secondary tone data bit wide, make the bit wide sum meet a numerical value that presets, storing device for storing current time secondary tone data and and previous moment secondary tone data before, from current time secondary tone data and previous moment secondary tone data, cast out the least significant bit (LSB) of a secondary tone data at least.In this structure, the sum that is kept at two secondary tone datas in the storage medium obtains restriction, therefore, compares with preserving all data conditions, might reduce circuit size.

Attention: have and a variety ofly cast out operation and can be used to finish the aforementioned operation of casting out.When requiring to simplify when casting out operation, suitable method is exactly: utilize the bit wide adjusting gear, by casting out least significant bit (LSB), thereby limit the bit wide sum of these two secondary tone datas.

Except aforesaid structure, can arrange like this: the bit wide adjusting gear changes a ratio, that is: be stored the shared ratio of bit wide in prevalue, at least according to a following condition: (i) type of image up to next previous moment secondary tone data that constantly just upgrades; (ii) temperature.

At this moment, be defined so that under will littler ground situation than current secondary tone data bit width twice at prevalue, when the shared ratio of the bit wide of the secondary tone data in current second moment in prevalue strengthened excessively, the influence of secondary tone data that the secondary tone data in the previous moment after the correction is subjected to preceding second moment is bigger, but can fully not be subjected to the influence of the secondary tone data of previous moment.Therefore, the essential ratio of setting, the shared ratio of the bit wide of the secondary tone data in promptly preceding second moment in prevalue is arranged to data to it, will suitably be subjected to the influence of these two numerical value secondary tone datas.

Though under the situation of the image of importing fast moving, corrected tone data is vulnerable to the influence of the secondary tone data in preceding second moment.Therefore, when the image type change made that the translational speed of expectation changes, aforesaid ratio correlation values also can change.Similarly, when temperature variation, the response speed of pixel also can change, thereby aforesaid ratio correlation values also can change.

On the other hand, according to aforesaid structure, the bit wide adjusting gear changes ratio, is stored the shared ratio of bit wide in prevalue up to next previous moment secondary tone data that just upgrades constantly, at least according to a following condition: (i) type of image; (ii) temperature.Therefore, no matter the type and/or the temperature of image, keeping aforesaid ratio is that a suitable numerical value is possible.As a result, just might keep the very high display quality of image display.

By the way, the drive unit of image display can be realized by hardware, perhaps also can come executive routine to realize by the computing equipment that adopts computing machine or any kind.That is to say that according to the present invention, program is exactly the plan that makes the computing machine running, just as previously described; According to the present invention, these programs of storage medium stores.

When program was carried out by computing machine, computing machine just served as the drive unit of image display.Therefore, as the drive unit of image display, just might realize that the response speed that can improve pixel also can reduce circuit size and calculated amount and can not brought tangible display quality with the shown image of pixel.

In addition, according to the present invention, image display comprises aforesaid drive unit, and according to the present invention, television receiver is also contained in this image display.

Image display and the television receiver arranged in aforesaid mode have comprised drive unit, so just might improve the response speed of pixel and may reduce circuit size and calculated amount and can not worsen display quality with the shown image of pixel significantly.

Simultaneously, as described above, according to the present invention, wherein the drive unit (21j is to 21p) of image display (1) comprising: tone conversion equipment (for example 142), be used for each pixel (sub-pixel point SPIX (1, a tone data indicated value of current tone 1)) converts the secondary tone data to, and the γ characteristic that this secondary tone data has is bigger than the γ characteristic of a tone data; Memory storage (for example picture storage means 131) is used to store current secondary tone data and just upgrades constantly up to next; Means for correcting (for example modulation processing section 133), be used to proofread and correct current secondary tone data, secondary tone data according to the previous moment that from memory storage, reads out, to promote the tone transition from previous moment secondary tone data to current time secondary tone data, wherein to be set to the lower bound of representative (denotable) numerical range than secondary tone data higher for the possible minimum of secondary tone data that changes according to the conversion of a tone data.

In aforesaid structure, be carved into the tone transition of current time tone a period of time to correction current time secondary tone data so that strengthen in the past, so might improve the response speed of pixel.In addition, in aforementioned structure, the tone reversal device converts a tone data to bigger γ characteristic secondary tone data.In addition, the possible minimum of secondary tone data that changes according to the conversion of a tone data is set to higher than the high lower bound of the representative numerical range of secondary tone data.

Therefore, when being used to show that pixel based on the image of secondary tone data shows by the indicated tone of secondary tone data, more can be than the low key tone that greater number under the situation of not carrying out gamma transformation, occurs.In addition, not the lower bound of secondary tone data corresponding to tone data than the value of the secondary tone data of lower bound (black level).Therefore, in the process of strengthening the tone transition, means for correcting can adopt the tone indicated value of the secondary tone data lower than aforesaid secondary tone data, so might improve the response speed of pixel.

Except aforesaid structure, can arrange like this: be provided with the bit wide of secondary tone data wideer than the bit wide of a tone data.Further say, except aforesaid structure, can arrange like this: the bit wide of a tone data is 8 positions, and the bit wide of secondary tone data is 10 positions.In these structures, the bit wide of secondary tone data is provided with widelyer than the bit wide of a tone data, has more high-precision gamma transformation so the tone reversal device can be carried out.

Except aforesaid structure, can arrange like this: drive unit comprises: the noise adding set, be used for before the secondary tone data is input to memory storage and means for correcting, and add noise and cast out the least significant bit (LSB) that pre-determines width; The noise generation device is used for generted noise and makes the noise data that adds same color pixel point adjacent one another are to have random strength, and this noise data is offered the noise adding set.Further say, except aforesaid structure, can arrange like this: the bit wide of a tone data is 8 positions, and the bit wide of secondary tone data is 10 positions, and the bit wide of least significant bit (LSB) is 2 positions.

Attention: can use the various methods of casting out, just as noted abovely cast out method.When simplifying when casting out step, suitable is that the noise adding set generates the secondary tone data by casting out than low order.

In these structures, the bit wide that is stored in secondary tone data in the memory storage is provided with than shorter by the bit wide of casting out the secondary tone data that generates than low order by the tone reversal device.Therefore, this just might reduce necessary memory capacity in the storage device.In addition, reduce by the bit wide that is positioned at the noise adding set handled tone data of circuit (memory storage, means for correcting and similar equipment) afterwards.

Therefore, this just might reduce the calculated amount of circuit size and these circuit, and might reduce the quantity and the occupied space of these leads of the lead that connects these circuit.In addition, noise generation device generted noise data make the noise data that adds same color pixel point adjacent one another are to have random strength.So this structure can not cause false contouring figure to occur, and is different from another kind of structure: only clip the secondary tone data than low order, make false contouring figure to have occurred in the image that shows with pixel.

The result, according to aforesaid structure, although it is shorter than the bit wide of the secondary tone data that is produced by the tone reversal device to be stored in the bit wide of the secondary tone data in the memory storage, but this just might keep the display quality of the shown image of pixel, makes can not appear at the notable difference that is occurred under the situation about not casting out than low order.

Attention: when the noise adding set is provided at the next stage of means for correcting, noise just is added on the data after the tone transition is reinforced.Therefore, the tone transition is strengthened excessively, and the brightness of pixel is undesirably increased.As a result, the undue reinforcement of tone transition may be used as superpower brightness by the user of image display.

As selection, the tone transition fully is not reinforced, and makes the brightness of pixel not reduce with achieving one's goal.As a result, perhaps insufficient reinforcement of tone transition can be used as weak brightness by the user.Yet according to aforesaid structure, means for correcting is positioned at the next stage of noise adding set.Therefore, the structure that is positioned at noise adding set previous stage with means for correcting is different, and this just might improve the response speed of pixel and can not bring the superpower or weak brightness that is caused by the noise adding set to occur.

As a result, just might prevent that significantly worsening from appearring in the display quality of the image that pixel is shown, and might reduce circuit size and calculated amount.

By the way, the drive unit of the image display of being introduced in above-mentioned each embodiment can be realized according to its driving method further.They can perhaps realize that by ordering about algorithm of computing machine execution wherein any such algorithm can be realized by the form with program further by adopting hardware to realize.Just, the program of any embodiment can be the program that makes computer run according to the present invention, as any aforementioned device, and, can stored programme according to any kind computer-readable medium of the embodiment of the invention.

When carrying out, computing machine serves as the drive unit of image display by computing machine (any capable operation computer program and/or from the computer equipment of media fetch program of an embodied on computer readable) when program.Therefore, as in the drive unit of image display, might realize the drive unit of image display, this drive unit can improve the response speed of pixel and reduce circuit size and calculated amount, can't obviously worsen the display quality of the shown image of pixel.

According to embodiments of the invention, program comprises: the step that the method that makes computing machine carry out above-mentioned any one driving display is formed.The computing machine of such this program of operation just serves as driver for display.

In these programs any one or whole programs can be expressed as computer data signal.For example, if computing machine receives the computer data signal that is carried on certain signal (for example, carrier wave, synchronizing signal or any other signal), and working procedure, computing machine just can come driving display by enough any driving methods.

Any one program in these programs when being recorded to a computer-readable and obtaining on the storage medium, can be stored and distribute at an easy rate.

The computing machine that reads storage medium can enough any driving method driving displays.

In addition, according to embodiments of the invention, image display comprises any drive unit noted earlier.And according to embodiments of the invention, a television receiver comprises any one image display.

Image display and the television receiver arranged with aforementioned manner all comprise drive unit, so just might improve the response speed of pixel.

Attention: the description of front has been introduced data storage was being cast out a kind of structure of processing with regard to carrying out before memory storage.Yet, also can be arranged to like this:, compress and the storage data by adopting well-known compress technique by memory storage, rather than before storing data, carry out and cast out processing for the data that must store; Carry out before means for correcting or the means for correcting data after this is proofreaied and correct in output and cast out processing.

The example that will describe is based on Fig. 1 or Figure 15 below.Intercepting circuit (36 145) be omitted memorizer control circuit (32 132) data imported of compression and these packed datas are stored into picture memory (31 131) in, the data that the come from picture memory output of contracing that is extracted.Further, modulation processing section (33 133) video data after proofreading and correct is cast out processing, and (i, j export k) as correcting video data D2 these data.

Also in this structure, before means for correcting or correction data, noise is added.Similarly, this just might improve the response speed of pixel and prevent to occur by adding the superpower or weak excessively brightness that noise caused.

In addition, the data that are stored in the memory storage are compressed by these compression processing.Similarly, this just might reduce necessary memory capacity in the storage device, further, casts out processing and is finished by means for correcting or means for correcting.Therefore, just might reduce the bit wide of video data, this video data must be handled by the circuit (for example, the similar devices of the panel 11 of data signal wire driving circuit 3 and image display 1) that is positioned at one-level under means for correcting or the means for correcting.In addition, cast out to handle after noise is added and carry out, so just might suppress the appearance of false contouring figure, this is different from only to carry out casts out the structure of processing.

As a result, just might realize the drive unit of an image display, in this equipment: might improve the response speed of pixel and can obviously must not worsen the shown image displaying quality of pixel.

Yet, as described in each embodiment, being positioned at more the device of previous stage (for example noise adding set or similarly device) and casting out than low order by impelling, this just might further reduce size of circuit.

Invention is described like this, but obviously same method may change in many ways.Such variation has not thought to run counter to the spirit and scope of invention, and to those skilled in the art, all such modifications all will be included within the following claim scope.

Claims (7)

1. the drive unit of an image display, wherein:

The tone reversal device, be used for will expression each pixel current tone a tone data convert secondary tone data to γ characteristic bigger than tone data γ characteristic;

Memory storage is used for the current secondary tone data of storage pixel point, up to next time;

Means for correcting is used for proofreading and correct current secondary tone data according to the previous secondary tone data that reads from memory storage, to simplify by the tone transition of previous secondary tone data to the current color adjusting data, wherein

The possible minimum of the secondary tone data that changes according to a tone data conversion is set to higher than the lower bound of the numerical range that can represent the secondary tone data.

2. according to the drive unit described in the claim 1, wherein:

The bit wide of secondary tone data is set to bigger than the bit wide of a tone data.

3. according to the drive unit described in the claim 2, wherein:

The bit wide of a tone data is 8 positions, and the bit wide of secondary tone data is 10 positions.

4. according to the drive unit described in the claim 1, comprising:

The noise adding set was used for before the secondary tone data is input to memory storage and means for correcting, add noise and cast out pre-determine bit width than low order;

The noise generation device is used for the generted noise data, so that the noise data of any intensity is added on the pixel adjacent one another are, as to have same color, and noise data is offered the noise adding set.

5. according to the drive unit described in the claim 4, wherein:

The bit wide of a tone data is 8 positions, and

The bit wide of secondary tone data is 10 positions, and

Bit wide than low order is 2 positions.

6. an image display comprises pixel and is used to generate corrected secondary tone data to drive the drive unit of pixel, and above-mentioned drive unit comprises:

The tone reversal device, be used for will expression each pixel current tone a tone data convert secondary tone data to γ characteristic bigger than tone data γ characteristic;

Memory storage is used for the current secondary tone data of storage pixel point, up to next time;

Means for correcting is used for proofreading and correct current secondary tone data according to the previous secondary tone data that reads from memory storage, to simplify by the tone transition of previous secondary tone data to the current color adjusting data, wherein

The possible minimum of the secondary tone data that changes according to a tone data conversion is set to higher than the lower bound of the numerical range that can represent the secondary tone data.

7. according to the image display described in the claim 6, wherein:

Image display is a television receiver.

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