CN1171190C - Brightness compensation method for plasma display - Google Patents
Brightness compensation method for plasma display Download PDFInfo
- Publication number
- CN1171190C CN1171190C CNB01110693XA CN01110693A CN1171190C CN 1171190 C CN1171190 C CN 1171190C CN B01110693X A CNB01110693X A CN B01110693XA CN 01110693 A CN01110693 A CN 01110693A CN 1171190 C CN1171190 C CN 1171190C
- Authority
- CN
- China
- Prior art keywords
- pixel data
- luminance compensation
- brightness
- value
- luminance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The present invention relates to a luminance compensation method used in plasma displays. The present invention comprises steps that the luminance value of the data of each pixel is first read from a pixel data column; the load of the pixel data column is then calculated, wherein the load is the number of the data of the pixels of which the luminance value exceeds a preset luminance critical value in the pixel data column; the primary luminance compensation value is obtained according to the load, and multiple secondary luminance compensation values are obtained according to the primary luminance compensation value; luminance compensation is carried out on the data of the pixels in sequence; when the luminance value is larger than or equal to a preset determining value of low luminance, the primary luminance compensation value is subtracted from the luminance value, and otherwise, the corresponding secondary luminance compensation value is subtracted from the luminance value; the pixel data column is finally output.
Description
Technical field
The invention relates to a kind of luminance compensation method and device, and this luminance compensation method is particularly relevant for a kind of luminance compensation method that is applicable to plasma scope.
Background technology
In a foreseeable future, people will be along with development raising day by day with the innovation of developing mode of audio-visual equipment manufacturing technology to the requirement of acousto-optic service.With the display is example, known cathode-ray tube (CRT) (Cathode Ray Tube, CRT) display, the radiation important disadvantages bulky except having, large-sized cathode-ray tube display, the image that the video screen edge shows also has the problem of serious image warping distortion, certainly will can't satisfy in the future people to the requirement of high-quality seeing and hearing enjoyment.After digital television started broadcasting, known cathode ray tube screen with the analog form developing will little by little be eliminated.Replacing, will be to have low radiation, low power consumption, and have concurrently the characteristic of large scale and small size plasma scope (Plasma Display Panel, PDP).
Please refer to Fig. 1, what it illustrated is the synoptic diagram of the fluoroscopic load effect of plasma scope (loading effect).So-called load effect is meant the shown brightness of each pixel (pixel) on the plasma scope video screen, can be subjected to same row (row) go up other pixels brightness influence and change, cause actual displayed brightness and normally answer the phenomenon that makes a difference between display brightness.As shown in Figure 1, three pixel columns (pixel row) 102,104,105 on the video screen, wherein pixel column 102 is by 106 and 110 formations of pixel area (pixel area); Pixel column 104 comprises pixel area 108 and 112; 105 of pixel columns comprise pixel area 109 and 113.Wherein pixel area 106 is low GTG value, and pixel area 108 is middle GTG values, and 109 of pixel areas belong to the high gray value.In addition, pixel area 110,112,113 has identical GTG value.Judge that according to general convention pixel area 110,112,113 should show and originally goes out identical brightness.But in fact, indivedual brightness L110, the L112 of pixel area 110,112,113,113 magnitude relationship are L110＞L112＞L113.That is to say, though the pixel of the pixel area 110 in the script pixel column 102, in the pixel column 104 in the pixel of pixel area 112 and the plain row 105 the GTG value of the pixel of pixel area 113 identical, but because pixel area 106 is dark data points on the pixel column 102, pixel area 108 in the pixel column 104 is brighter data points compared to pixel area 106, and the pixel area 109 in the pixel column 105 is brighter data points compared with pixel area 108, so the brightness that the pixel of pixel area 112 shows is darker than the brightness that the pixel of pixel area 110 shows, and the brightness that the pixel of pixel area 113 shows is darker than the brightness that the pixel of pixel area 112 shows again.If the same pixel brightness that lists of plasma scope video screen is bright more, then the shown brightness of this row pixel is compared with the brightness that need show in theory, and the degree of pixel actual displayed brightness deterioration is just big more, and this situation just is called load effect.Be noted that load effect only occurs in the pixel of same row usually, the size of the brightness of certain pixel just is only relevant with the brightness of same other pixels of row, is not subjected to the influence of the brightness of other pixels of same delegation (column).That is to say that load effect can't take place vertical direction.
Pictorial data (image data) is made of a plurality of pixel data row (pixel data row).With the resolution (resolution) of video screen (panel) be 800 * 600 (be whole video screen each show 800 pixels, each row has 600 pixels) plasma scope be example, a pictorial data just includes 600 pixel data row, and pixel data row include 800 pixel datas (pixel data).Please refer to Fig. 2, its illustrate is the synoptic diagram of known luminance compensating mechanism 200.Known luminance compensating mechanism 200 comprise a programmable gate array (Field Programmable Gate Array, FPGA) 202 and two and the memory bank that couples 204.At first, the pictorial data that inputs to plasma scope can be introduced into a luminance compensating mechanism 200.Luminance compensating mechanism 200 can once read pixel data row, judges earlier whether these pixel data row need to carry out luminance compensation.If judge and need make luminance compensation, luminance compensating mechanism 200 can carry out luminance compensation to the pixel data row.Afterwards, luminance compensating mechanism 200 can be exported the data of these pixel data that had carried out luminance compensation row, each pixel of this pixel column will show according to pairing compensation pixel data, make pixel column each pixel actual displayed brightness can near original video data the color and the brightness that should show, and the distortion that is unlikely to produce brightness and color.
Please refer to Fig. 3, its illustrate is the process flow diagram of the method for known solution load effect.Now the luminance compensation method with known plasma scope is described below: at first, in step 302, luminance compensating mechanism can read the pixel data row in regular turn.Wherein, each pixel data row all includes a plurality of pixel datas, and each pixel data includes a brightness value.
Described by preamble, the pixel brightness of a certain pixel column is bright more on the plasma scope video screen, and then the load effect of this pixel column is just big more.In other words, the shown intrinsic brilliance of this pixel column is compared with the brightness that need show in theory, and the degree of brightness deterioration is just big more.Therefore, when luminance compensating mechanism judged whether that pixel data row are made luminance compensation, the standard of its foundation was the size of each pixel data brightness value in these pixel data row.In pixel data, the size of brightness value is represented with the binary bit formatted data of eight of length usually, is called the GTG value (gravellevel value) of pixel data.The scope of general GTG value is from (00000000)
2To (11111111)
2, represent to be exactly from 0 to 255 with the decade form, complete black with 0 representative, 255 representatives are complete white.So, then the size of brightness value always has 256 kinds, the big more brighter display of just representing of brightness value.The known practice is to preestablish a brightness critical values, whether can cause the load effect of pixel column in order to the brightness value that determines a certain pixel data.If the brightness value of a certain pixel data is big or equal brightness critical values, then on the plasma scope video screen,, can make the pixel column at its place produce load effect according to the pixel that these pixel data row show.Wherein, the size of brightness critical values is predefined.With eight binary bit form GTG value, because high-order more GTG Value Data is big more to the weight of brightness influence.So generally when setting brightness critical values big or small, only need to consider that a size high-order in the GTG value gets final product.Known method is that the Senior Three position that brightness critical values is defined as the GTG value is equaled 101.If the Senior Three position of the GTG value of a pixel data is big or equal 101, then this pixel data is regarded as increasing the load effect of pixel column on the plasma scope video screen.Otherwise if the GTG value Senior Three position of pixel data is less than 101, then this pixel data is regarded as can not increasing the load effect of pixel column on the plasma scope video screen.
Luminance compensating mechanism reads after the pixel data row in regular turn.Then enter step 304, luminance compensating mechanism can calculate the load (load) of these pixel data row.Load on and be defined as in the pixel data row herein, brightness surpasses the pixel data number of a default low-light level signals.The load of pixel data row is big more, and the size of brightness value is many more above the pixel data number of this low-light level critical value in the expression pixel data row.So, the load effect that caused of the fluoroscopic pixel column of this pixel data article on plasma volumetric display can be serious more.
Afterwards, enter step 306, judge whether these pixel data row need to do luminance compensation.Described by preamble, resemble greatly more unlike the load of data rows, can make that the load effect of pixel column is serious more on the plasma scope video screen.At this moment, luminance compensating mechanism is necessary to do luminance compensation more.The known practice is judged when whether the pixel data row need to make luminance compensation, can be preestablished a load critical value.If the load of pixel data row is big or equal the load critical value, it is excessive and need to carry out luminance compensation that then these pixel data row can be regarded as load effect.Otherwise less than the load critical value, then the pixel data row can be regarded as not needing to do luminance compensation and directly output as if load.
Described by preamble, when the load of pixel data row was big more, when representing that then a certain pixel column of plasma scope video screen shows according to these pixel data row, the degree of pixel actual displayed brightness deterioration can be big more.Known luminance compensation method is that the GTG value with each pixel adds a luminance compensation value, and by the mode of the brightness that improves the pixel data row, the influence of lowering load effect reaches the effect of luminance compensation.
In addition, what must consider is to add the load effect that the luminance compensation value no doubt can alleviate the fluoroscopic pixel column of plasma scope.But, if it is excessive to add the luminance compensation value of a certain pixel data row, compare with other pixel columns according to the pixel column of this pixel data row demonstration, can seem bright especially.So, will influence the continuity of whole image brightness and caused the distortion of displayed image.So at prerequisite following of the output quality that does not influence image, it is necessary selecting the appropriate brightness offset.
Known decision pixel data row appropriate brightness compensation value method is a built-in in advance luminance compensation table in luminance compensating mechanism.The luminance compensation table is made of one group of luminance compensation value, and this group luminance compensation value is arranged in regular turn according to size is descending.That is to say, in this luminance compensation table, the position the preceding its value of luminance compensation value can than the position after the luminance compensation value want big.When the pixel data row need be made luminance compensation, then luminance compensating mechanism can be selected the appropriate brightness offset according to the luminance compensation table.In execution in step 308, when selecting the luminance compensation value, luminance compensating mechanism is selected first luminance compensation value in the luminance compensation table earlier.Just in the luminance compensation table, the luminance compensation value of predefined maximum.Afterwards, execution in step 310 adds the luminance compensation value in the brightness value of each pixel of pixel data row, to carry out luminance compensation.As can be known described by preamble, on behalf of the brightness of pixel, the increase of GTG value promptly increase, and so resembles the shown brightness of row on the video screen by improving, and reaches the effect of luminance compensation.The pixel data row that will add the luminance compensation value now are defined as compensation pixel data row.
Then, enter step 312, calculate the load of compensation pixel data row.Its account form is identical with the load of calculating script pixel data row.Afterwards, enter step 314, whether the load that relatively compensates the pixel data row is identical with the load that pixel data originally is listed as.As can be known described by preamble, when carrying out luminance compensation, adding the luminance compensation value must be prerequisite with the quality that does not influence image output.In other words, the luminance compensation value of adding can not be excessive.When known method judge to be carried out luminance compensation, whether excessive standard was the luminance compensation value of adding: the load of carrying out the compensation pixel data row behind the luminance compensation must be identical with the load of original pixel data row.If the load of compensation pixel data row is greater than the load of original pixel data row, it is too big then to be regarded as the luminance compensation value that added, is enough to influence the quality of output image, the action that next step can repeating step 308, in the luminance compensation table, select next luminance compensation value.Described by preamble, in the luminance compensation table relation of the position of luminance compensation value and size as can be known, new selected luminance compensation value can be littler than the luminance compensation value of original selection.Then, repeating step 310 judges once more to the action of step 314 whether whether the luminance compensation value that is added is too big, can have influence on the output quality of image again.If the load of compensation pixel data row is still greater than the load of pixel data row originally, then can get back to step 308 again, from the luminance compensation table, select next less luminance compensation value to come the pixel data row are carried out luminance compensation again, the compensation pixel data after meeting adding luminance compensation value is listed as till the condition identical with the load of original pixel data row.At last,, just will compensate pixel data and be listed as, finish luminance compensation from luminance compensating mechanism 200 outputs in execution in step 316.
Yet known method of carrying out luminance compensation but can produce following problem: at first, the method for known luminance compensation is to judge with a low-light level signals of fixing and load critical value to need to carry out luminance compensation.And when carrying out luminance compensation, no matter the size of this pixel data row load all is the luminance compensation value that decides these pixel data row with identical luminance compensation table.But do not consider the different pixel data of load row, the luminance compensation value that needs to add also must be adjusted thereupon, just can reach the effect of preferable luminance compensation.Thus, with the size of the luminance compensation value that make to add can't realistic compensation needs, caused distortion, and reduced the effect of luminance compensation.
In addition, because the known practice when making luminance compensation, is that the same brightness data that lists all pixels is all added identical luminance compensation value.Even so complete black brightness data also can be coupled with a luminance compensation value.Thus, the dark image that will make all becomes and comes brightly than normal dark image, and this measure has not only influenced the minimum brightness of video screen actual displayed, has also reduced the contrast of image brightness simultaneously.
In addition on the one hand, if having maximum brightness value in the fluoroscopic a certain row pixel data of plasma scope, that is obtain pixel data in this row pixel data and have GTG value 255.Thus, much no matter the load of this row pixel has, all can't remake any luminance compensation action, because the maximal value of GTG can only arrive 255.If even the pixel data brightness data that lists all pixels all is complete when bright, this moment this row pixel the load maximum, show that its load effect of pixel column of these pixel data row is also maximum.Therefore, the luminance compensation value of pixel data row needs adding should be maximum.But, therefore can't carry out luminance compensation with the known method of luminance compensation value that adds because the brightness value of pixel data has been a maximal value.
Also have, the method of known luminance compensation is the pixel data that relatively adds before the luminance compensation value with afterwards pixel data row, whether equate through the number of judging that the two GTG value Senior Three position is big or equaling 101 pixel, decide the luminance compensation value that is added whether suitable.If but in a certain row pixel data, the GTG value of a certain pixel by chance is " (10011111)
2"; add that so any luminance compensation value all can make the compensation pixel data row that add after the luminance compensation value; its brightness data Senior Three position big or equal 101 number of pixels all can be greater than in the original pixel data row, the Senior Three position of brightness data is big or equal 101 number of pixels.That is to say that if the GTG value of a pixel is arranged in a certain row pixel data be " (10011111) just
2", then this row pixel data also can't carry out the compensation of brightness.
By above narrating as can be known, the method for known luminance compensation has following shortcoming at least:
1. the size of luminance compensation value can't adjust along with how many degree of pixel brightness above the low-light level signals.
2. can influence and improve the shown minimum brightness value of video screen pixel, reduce the contrast of image brightness.
If the brightness that has a pixel at least in the same row pixel data for bright entirely, then these entirely bright picture elements can't carry out luminance compensation.
4. if the GTG value that has a pixel in the same row pixel data at least near default brightness critical values, for example is " (10011111)
2", then this row pixel can't be carried out luminance compensation.
Summary of the invention
In view of this, purpose of the present invention is exactly that a kind of luminance compensation method that is used for plasma scope that is applicable to is being provided, and reaches following purpose:
1. can above how many degree of the grade of load adjust the size of luminance compensation value along with pixel brightness.
2. the brightness adjustment does not influence the shown minimum brightness value of video screen, can not reduce the contrast of image brightness yet.
3. can't can't carry out luminance compensation because of some special situation.
According to purpose of the present invention, a kind of luminance compensation method that is applicable to plasma scope is proposed, this plasma displaying appliance has a luminance compensating mechanism, and this device can use luminance compensation method that the pixel data row are carried out luminance compensation.Luminance compensation method may further comprise the steps at least: at first, read the brightness value of each pixel data in the pixel data row; Then, the load of calculating pixel data rows, wherein, load is the number that brightness value surpasses the pixel data of default brightness critical values in the pixel data row; Come again, obtain corresponding subjective brightness offset according to load; Afterwards, obtain a plurality of times corresponding luminance compensation values according to the subjective brightness offset again; Then, extract the brightness value of each pixel data in regular turn, and carry out luminance compensation, wherein according to the brightness value of each pixel data, the mode of luminance compensation is: or the low-light level signals that equal preset big when the brightness value of pixel data then deducts brightness value the subjective brightness offset; Otherwise, then deduct the luminance compensation value pairing time according to the brightness value size; At last, export this pixel data row.
That is to say, the invention provides a kind of luminance compensation method that is used for plasma scope, this plasma display comprises a luminance compensating mechanism, this luminance compensation method is that the pixel data row that input to this plasma display are carried out luminance compensation, wherein, these pixel data row comprise a plurality of pixel datas with a brightness value, and this luminance compensation method may further comprise the steps:
Read the brightness value of pixel data in these pixel data row;
Calculate a load of these pixel data row, wherein, this load is to equal the number that this brightness value surpasses the pixel data of a default brightness critical values;
Obtain this pixel data according to this load and be listed as a pairing subjective brightness offset;
Obtain this pixel data according to this subjective brightness offset and be listed as pairing a plurality of luminance compensation values, wherein, in these pixel data row, the pixel data that brightness value is lower than a low-light level signals is respectively to correspond to one of time luminance compensation value;
Each pixel data to these pixel data row carries out the luminance compensation action in regular turn, wherein, when the brightness value of each pixel data more than or equal to this low-light level signals, then this brightness value is deducted this subjective brightness offset, otherwise, then this brightness value is deducted its pairing this time luminance compensation value; And
Export this pixel data row.
The present invention also provides a kind of luminance compensating mechanism of plasma scope, this luminance compensating mechanism is that the pixel data row that input to this plasma display are carried out luminance compensation, wherein, these pixel data row comprise a plurality of pixel datas with a brightness value, and this luminance compensating mechanism comprises:
One data fetch device is in order to read the brightness value of pixel data in these pixel data row;
One load calculation device, in order to calculate a load of these pixel data row, wherein, this load is to equal the number that this brightness value surpasses the pixel data of a default brightness critical values;
One subjective brightness offset determination device is listed as a pairing subjective brightness offset in order to obtain this pixel data according to this load;
A luminance compensation value determining device, be listed as pairing a plurality of luminance compensation values in order to obtain this pixel data according to this subjective brightness offset, wherein, in these pixel data row, the pixel data that brightness value is lower than a low-light level signals is respectively to correspond to one of time luminance compensation value;
One pixel data compensation system, carry out this luminance compensation action in order to each pixel data that in regular turn this pixel data is listed as, wherein, when the brightness value of each pixel data more than or equal to this low-light level signals, then this brightness value is deducted this subjective brightness offset, otherwise, then this brightness value is deducted its pairing this time luminance compensation value; And
One output unit is in order to export this pixel data row.
For above-mentioned purpose of the present invention, characteristic and advantage can be become apparent, a most preferred embodiment cited below particularly, and in conjunction with the accompanying drawings, be described in detail below.
Description of drawings
Fig. 1 illustrates the synoptic diagram of the fluoroscopic load effect of plasma scope.
Fig. 2 illustrates the synoptic diagram of known luminance compensating mechanism.
Fig. 3 illustrates the process flow diagram of the method for known solution plasma scope load effect.
Fig. 4 illustrates a kind of process flow diagram that is used for the luminance compensation method of plasma scope according to the present invention's one most preferred embodiment.
In illustrating, Fig. 5 is built in the load of pixel data row of a luminance compensating mechanism and the mapping table of subjective brightness offset.
Be built in Fig. 6 illustrates in the luminance compensating mechanism, the subjective brightness offset is under 10 the situation, the mapping table of brightness value and time luminance compensation value.
Be built in Fig. 7 illustrates in the luminance compensating mechanism, the subjective brightness offset is under 20 the situation, the mapping table of brightness value and time luminance compensation value.
Embodiment
Spirit of the present invention is to decide different luminance compensation values according to the different brightness value of each pixel data in the pixel data row.And be to carry out luminance compensation in the mode that brightness value deducts the luminance compensation value.
Please refer to Fig. 4, its illustrate is a kind of process flow diagram that is used for the luminance compensation method of plasma scope according to the present invention's one most preferred embodiment.As if the plasma scope video screen that with a resolution is 800 * 600 is example, each pixel is shown 800 pixels, each pixel all has the pixel data of red, blue, green three kinds of colors, and the pixel data of every kind of color all has a brightness value, can make so, just that each pixel demonstrates suitable color and brightness on the video screen.So luminance compensating mechanism once can be to pixel data row, always have 800 * 3 the brightness value of totally 2400 pixel datas carry out luminance compensation.
At first, execution in step 402, luminance compensating mechanism once reads all pixel datas of pixel data row, 2400 pixel datas altogether.Afterwards, execution in step 404, the load of calculating pixel data rows.The mode of computational load is identical with the known practice, and luminance compensating mechanism can calculate the number that brightness value surpasses the pixel data of default brightness critical values, decides the load of pixel data row.Be noted that because the characteristic of each plasma scope Plasmia fluorescent screen and being not quite similar, therefore when the generation load effect, the size of load effect is also inequality.In other words, when identical pixel data row input to different plasma scopes, because the difference of the plasma panel characteristic of each plasma scope, therefore the degree of the load effect that causes on different plasma scope video screens is also different.In order to reach best luminance compensation effect, the size of the default brightness critical values of luminance compensating mechanism of every plasma scope also must be looked the difference of every plasma scope plasma panel characteristic and be done suitable adjustment.
Luminance compensating mechanism gets final product execution in step 406 after the load that obtains the pixel data row, the size of classifying load according to pixel data as is with look-up table decision subjective brightness offset.The present invention is in advance at the built-in luminance compensation table of luminance compensating mechanism.Please refer to Fig. 5, its illustrate is the interior load of the pixel data row in the luminance compensating mechanism and the mapping table of subjective brightness offset of being built in.Different with the known practice is that luminance compensation table proposed by the invention can be divided into several different grades according to the size of pixel data row load, and all corresponding subjective brightness offset of each grade, as shown in Figure 5.So, can improve known luminance compensation method and only decide and want to carry out luminance compensation with a fixing load critical value, and the size of the luminance compensation value shortcoming that can't adjust along with the size of pixel data row load.
Described by preamble, because the difference of each plasma scope plasma panel characteristic, therefore the load effect that causes on different plasma scope video screens is also different.So the corresponding relation of load size and luminance compensation value be because of plasma scope different.So, when every plasma scope is done product test, in the pre-set luminance compensation table of palpus, the corresponding relation of load and subjective brightness offset, and be stored in the luminance compensating mechanism.
Known luminance compensation method is that brightness data is directly added the luminance compensation value.But so have brighter display when the pixel data row, when load effect is big more, but difficult more on the contrary shortcoming of carrying out luminance compensation.In plasma scope, load effect is big more pixel column just, and the shown brightness of its pixel is compared with the brightness that need show in theory, and the degree of brightness deterioration is big more.From the above, the brightness of the required increase of pixel column that load is healed big the more, still, the brightness value big pixel of healing is difficult to increase with the method that adds the luminance compensation value brightness of pixel on the contrary.Since the pixel data that brightness value is high can't increase its GTG value again, the GTG value of so just that brightness value is low pixel data reduces, and its brightness is reduced.
Therefore, the method that the present invention taked deducts each brightness data one luminance compensation value exactly.So, when the pixel in the pixel column on the plasma scope video screen shows according to pixel data, with the brightness meeting of the pixel of the same row of pixel of exhibit high brilliance because of the load effect deepening.And on the other hand, with the pixel that shows the same row of low-light level then because after suitably deducting a luminance compensation value, shown brightness also can than original institute should show secretly.At this moment, the difference of the shown intrinsic brilliance of pixel of the pixel of exhibit high brilliance and demonstration low-light level is close with both differences of GTG value in the original pixel data.So can alleviate the shown image quality of load effect article on plasma volumetric display video screen and the influence of distortion.
Referring again to Fig. 5, described by preamble, when pixel column showed according to the pixel data row on the big more expression video screen of load of pixel data row, its load effect was big more, that is the shown brightness ratio of the pixel on the pixel column original the brightness decay that should show must be many more.On the contrary, the pixel that load effect is more little, its shown brightness is more little with the degree of original the brightness decay that should show.If will carry out luminance compensation according to method proposed by the invention, the luminance compensation value that the pixel data row that then load is big more need deduct is more little.The pixel data row that load is more little, the luminance compensation value that it need deduct is big more.In other words, along with successively decreasing of pixel data row load, the subjective brightness offset that need deduct need increase progressively.Be noted that, because the size of the load that the size of Plasmia fluorescent screen load effect that panel produces can't be listed as with the pixel data of institute feed-in is directly proportional, so the corresponding relation of predefined load and subjective brightness offset is a prerequisite can reach preferable luminance compensation effect, might not must be the relation of linearity as shown in Figure 5.
When carrying out luminance compensation, need the brightness value of pixel data is deducted a luminance compensation value according to method proposed by the invention.But in the pixel data row, there is its brightness value of pixel data of part originally very little, if deduct the luminance compensation value again, then the brightness value of this this pixel data might be reduced to zero, thereby have influence on the brightness contrast of displayed image.For when alleviating the fluoroscopic load effect of plasma scope, do not have influence on the contrast of displayed image, so need to consider in addition the lower pixel data of brightness value, the luminance compensation value that when carrying out luminance compensation, need deduct.Meeting of the present invention is prior to a default low-light level signals in the luminance compensating mechanism.In order to judge that each pixel data is general luminance pixel data or low-light level pixel data.If the brightness value of a certain pixel data is big or equal the low-light level signals, then this pixel data be can be considered general luminance pixel data.If the brightness value of a certain pixel data is lower than the low-light level signals, then this pixel data is considered as the low-light level pixel data when carrying out luminance compensation, be lower than the low-light level pixel data of low-light level signals, the luminance compensation value that needs other decision to deduct.
Then be execution in step 408, step 408 is that the size according to the subjective brightness offset decides the required inferior luminance compensation value that deducts of low-light level pixel data.The method that the present invention takes is: brightness value is lower than the pixel data of low-light level signals, is divided into several different low brightness levels, all corresponding luminance compensation value of each low brightness levels according to the size of its GTG value.Be noted that, the low-light level pixel data that the GTG value is big more, its pairing luminance compensation value must be more near the subjective brightness offset.When carrying out luminance compensation, it is the smaller the better to deduct luminance compensation value difference distance near the low-light level pixel data of low-light level signals and general luminance pixel data near the low-light level signals, so, just can avoid carrying out after the luminance compensation, near the low-light level pixel data of low-light level signals with near the general luminance pixel data of low-light level signals because deduct the luminance compensation value of different sizes, and in various degree luminance compensation effect arranged, therefore the factitious phenomenon of bright-dark degree that so can displayed image takes place.In addition, the size of inferior luminance compensation value can be along with the attenuating of the GTG value of correspondence and is successively decreased thereupon.In other words, the low more pixel data of brightness value is when carrying out luminance compensation, and the luminance compensation value that deducts can be more little, even be 0.So, just can not make the low-light level pixel data after deducting time luminance compensation value, thereby reduce the contrast of displayed image light and shade when hanging down GTG.
Please refer to Fig. 6, its illustrate is built in the luminance compensating mechanism for interior, and the subjective brightness offset is under 10 the situation, the mapping table of the selected brightness value of the present invention and time luminance compensation value.Suppose that a luminance compensation value is set at 100 with the low-light level signals.The GTG value is big or to equal 100 pixel data be general luminance pixel data, and the GTG value is considered as the low-light level pixel data less than 100 pixel data.Described by preamble, determining that the subjective brightness offset is under 10 the situation, near 100 low-light level pixel data, its pairing luminance compensation value can be more near 10 more in brightness.As shown in Figure 6, setting pairing luminance compensation value of the pixel data of intensity gray scale value between 90～100 is 9, and pairing luminance compensation value of the pixel data of brightness between 80～90 is 8, and by that analogy, the inferior luminance compensation value that sets is successively decreased along with the reduction of brightness.And the GTG value of brightness is lower than 10 brightness data, because the GTG value is very little, so inferior luminance compensation value is set at 0, does not promptly do the processing of luminance compensation.Thus, can carry out luminance compensation on the one hand, also can possess the brightness performance of the pixel that shows the low-light level pixel data in the pixel column on the other hand, and keep the size of displayed image brightness contrast.
Luminance compensating mechanism must be set in advance under the situation of different subjective brightness offsets, the corresponding relation between brightness value and time luminance compensation value.When carrying out luminance compensation, could carry out the low-light level compensation along with the difference of subjective brightness offset.Please refer to Fig. 7, its illustrate is built in the luminance compensating mechanism for interior, and the subjective brightness offset is under 20 the situation, the mapping table of brightness value and time luminance compensation value.Method and the described subjective brightness offset of preamble that determines pairing the luminance compensation value of low-light level pixel data of different brightness values is that 10 situation is identical.Be noted that the size of inferior luminance compensation value also must be along with the difference of the plasma panel characteristic of each plasma scope and done suitable adjustment.In addition, identical with the situation of the pairing subjective brightness offset of the described decision different loads of preamble, predefined low-light level pixel data shows as prerequisite with the corresponding relation of time luminance compensation value can reach preferable luminance compensation effect and can possess the brightness that shows the pixel of low-light level pixel data on the video screen simultaneously, might not and Figure 7 shows that linear relationship as Fig. 6.
After having determined the subjective brightness offset and inferior luminance compensation value that the execution luminance compensation need deduct, then, execution in step 410 is carried out luminance compensation to each pixel data in regular turn.Luminance compensating mechanism reads the brightness value of each pixel data in the pixel data row in regular turn.Afterwards, execution in step 412 judges whether pixel data is general luminance pixel data.If then execution in step 414, the brightness value of this pixel data is deducted the subjective brightness offset; If not, then this pixel data is the low-light level pixel data, and then execution in step 416, deducts its pairing luminance compensation value according to the size of low-light level pixel data brightness value.Pixel data is after finishing luminance compensation, and then execution in step 418 is exported this pixel data.Luminance compensating mechanism is on one side pixel data being deducted the appropriate brightness offset, on one side the mode of pixel data after the output compensation carry out luminance compensation.Therefore, behind the output pixel data, then execution in step 420 checks in these pixel data row whether also have pixel data not carry out luminance compensation as yet.If then repeating step 410, continue in regular turn pixel data to be carried out luminance compensation.If not, represent that then all pixel datas have all carried out luminance compensation in the pixel data row.Represent that so, then luminance compensating mechanism executes the work of luminance compensation and process ends to pixel data row.
Disclosed luminance compensation method and the device that is used for plasma scope of the above embodiment of the present invention can reach following effect:
1. the present invention takes the different subjective brightness offset of difference decision according to each pixel data row load, and the low-light level pixel data is chosen suitable inferior luminance compensation value according to brightness value.When carrying out luminance compensation, the big I of luminance compensation value is along with size and itself brightness value of the load of pixel data row are done suitable adjustment.So, just can reach the effect of preferable luminance compensation, and improve known luminance compensation method and only decide the unequally loaded pixel data to be listed as the luminance compensation value of required adding with a fixing luminance compensation table, and can't decide the shortcoming of luminance compensation value along with the load size of pixel data row.
2. the present invention carries out luminance compensation with the method that brightness value deducts the luminance compensation value.So will improve known luminance compensation method, brightness value is directly added the luminance compensation value, and produce difficult more on the contrary shortcoming of carrying out luminance compensation when load effect is big more.If the brightness that in the pixel data row pixel is arranged is for bright entirely, or it is " (10011111) that the intensity gray scale value of pixel is arranged in the pixel data row
2", all can carry out luminance compensation.
3. the present invention is except the brightness value with pixel data deducts the luminance compensation value, and the low-light level pixel data then deducts suitable inferior luminance compensation value according to the brightness value size and carries out luminance compensation.So, can carry out luminance compensation on the one hand, the brightness performance that also can possess the pixel that shows the low-light level pixel data on the plasma scope video screen on the other hand, make luminance compensation not influence the shown minimum brightness value of video screen, also can not reduce the size of the brightness contrast of image brightness.
In sum; though the present invention discloses as above with a most preferred embodiment; right its is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, therefore scope of patent protection of the present invention should be as the criterion with accompanying claims institute restricted portion.
Claims (7)
1. luminance compensation method that is used for plasma scope, this plasma display comprises a luminance compensating mechanism, this luminance compensation method is that the pixel data row that input to this plasma display are carried out luminance compensation, wherein, these pixel data row comprise a plurality of pixel datas with a brightness value, and this luminance compensation method may further comprise the steps:
Read the brightness value of pixel data in these pixel data row;
Calculate a load of these pixel data row, wherein, this load is to equal the number that this brightness value surpasses the pixel data of a default brightness critical values;
Obtain this pixel data according to this load and be listed as a pairing subjective brightness offset;
Obtain this pixel data according to this subjective brightness offset and be listed as pairing a plurality of luminance compensation values, wherein, in these pixel data row, the pixel data that brightness value is lower than a low-light level signals is respectively to correspond to one of time luminance compensation value;
Each pixel data to these pixel data row carries out the luminance compensation action in regular turn, wherein, when the brightness value of each pixel data more than or equal to this low-light level signals, then this brightness value is deducted this subjective brightness offset, otherwise, then this brightness value is deducted its pairing this time luminance compensation value; And
Export this pixel data row.
2. luminance compensation method according to claim 1 is characterized in that, this subjective brightness offset is to obtain by look-up table according to this load.
3. luminance compensation method according to claim 1 is characterized in that, this time luminance compensation value is to obtain by look-up table according to this subjective brightness offset.
4. luminance compensation method according to claim 1 is characterized in that, each pixel data that brightness value is lower than this low-light level signals is that the size according to the brightness value of each pixel data obtains pairing luminance compensation value of this pixel data by look-up table.
5. luminance compensation method according to claim 1 is characterized in that, more little when the load of these pixel data row, its pairing subjective brightness offset is then big more.
6. luminance compensation method according to claim 1 is characterized in that, the brightness value of each pixel data that brightness value is lower than this low-light level signals is big more, and pairing time the luminance compensation value is then big more.
7. the luminance compensating mechanism of a plasma scope, this luminance compensating mechanism is that the pixel data row that input to this plasma display are carried out luminance compensation, wherein, these pixel data row comprise a plurality of pixel datas with a brightness value, and this luminance compensating mechanism comprises:
One data fetch device is in order to read the brightness value of pixel data in these pixel data row;
One load calculation device, in order to calculate a load of these pixel data row, wherein, this load is to equal the number that this brightness value surpasses the pixel data of a default brightness critical values;
One subjective brightness offset determination device is listed as a pairing subjective brightness offset in order to obtain this pixel data according to this load;
A luminance compensation value determining device, be listed as pairing a plurality of luminance compensation values in order to obtain this pixel data according to this subjective brightness offset, wherein, in these pixel data row, the pixel data that brightness value is lower than a low-light level signals is respectively to correspond to one of time luminance compensation value;
One pixel data compensation system, carry out this luminance compensation action in order to each pixel data that in regular turn this pixel data is listed as, wherein, when the brightness value of each pixel data more than or equal to this low-light level signals, then this brightness value is deducted this subjective brightness offset, otherwise, then this brightness value is deducted its pairing this time luminance compensation value; And
One output unit is in order to export this pixel data row.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01110693XA CN1171190C (en) | 2001-04-17 | 2001-04-17 | Brightness compensation method for plasma display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01110693XA CN1171190C (en) | 2001-04-17 | 2001-04-17 | Brightness compensation method for plasma display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1381824A CN1381824A (en) | 2002-11-27 |
| CN1171190C true CN1171190C (en) | 2004-10-13 |
Family
ID=4658768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB01110693XA Expired - Fee Related CN1171190C (en) | 2001-04-17 | 2001-04-17 | Brightness compensation method for plasma display |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1171190C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100345173C (en) * | 2003-01-13 | 2007-10-24 | 友达光电股份有限公司 | Brightness compensation method of display |
| JP4084262B2 (en) * | 2003-08-08 | 2008-04-30 | 三星エスディアイ株式会社 | Luminance correction circuit, luminance correction method, video display device, and video display method |
| CN103594061A (en) * | 2012-08-17 | 2014-02-19 | 承景科技股份有限公司 | Adjustment method and device for backlight luminance |
-
2001
- 2001-04-17 CN CNB01110693XA patent/CN1171190C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1381824A (en) | 2002-11-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10460679B2 (en) | Power management for modulated backlights | |
| CN1121114C (en) | Image quality correction circuit for video signals | |
| US8189013B2 (en) | Video signal processing device and method of processing gradation | |
| US7710440B2 (en) | Apparatus and method of video signal processing for matrix display apparatus | |
| JP3949140B2 (en) | Method and apparatus for driving flat panel display device | |
| CN101114416A (en) | Method for improving display brightness uniformity of flat-panel display | |
| US20010033260A1 (en) | Liquid crystal display device for displaying video data | |
| CN1940695A (en) | Method for compensating a picture | |
| CN1925579A (en) | Display apparatus and method of preventing image burn-in | |
| CN109686323B (en) | Display device, driving method thereof and electronic equipment | |
| US20050093795A1 (en) | Method for dynamically adjusting video brightness | |
| CN100353211C (en) | Luminance compensation method and device for liquid crystal display | |
| US6774875B2 (en) | Method for compensating luminance of a plasma display panel | |
| US7102696B2 (en) | Method of effecting various anti compensation processes on segmented gray level of input image on plasma display panel | |
| CN1203461C (en) | Method of and unit for displaying an image in sub-fields | |
| WO2008036610A2 (en) | Gamma uniformity correction method and system | |
| JPH06332399A (en) | Method for controlling electronic display and device therefor | |
| CN1571003A (en) | Method and apparatus for calculating an average picture level and plasma display using the same | |
| CN1171190C (en) | Brightness compensation method for plasma display | |
| US6774873B2 (en) | Method for implementing error diffusion on plasma display panel | |
| CN100345173C (en) | Brightness compensation method of display | |
| CN1509464A (en) | Method and device for improving grey scale reslution controlled by pulse width modulated | |
| KR100508306B1 (en) | An Error Diffusion Method based on Temporal and Spatial Dispersion of Minor Pixels on Plasma Display Panel | |
| CN100351880C (en) | Plasma two-dimensional display with grey scale white balancing device | |
| KR20000000730A (en) | Device for driving a plasma display panel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: YOUDA PHOTOELECTRIC CO., LTD. Free format text: FORMER OWNER: DAQI SCIENCE AND TECHNOLOGY CO LTD Effective date: 20040218 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20040218 Address after: Hsinchu city of Taiwan Province Applicant after: AU Optronics Corporation Address before: Hsinchu city of Taiwan Province Applicant before: Daqi Science and Technology Co., Ltd. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20041013 Termination date: 20150417 |
|
| EXPY | Termination of patent right or utility model |