CN100399416C - Apparatus and method for improving gray scale of display element - Google Patents
Apparatus and method for improving gray scale of display element Download PDFInfo
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- CN100399416C CN100399416C CNB200410047382XA CN200410047382A CN100399416C CN 100399416 C CN100399416 C CN 100399416C CN B200410047382X A CNB200410047382X A CN B200410047382XA CN 200410047382 A CN200410047382 A CN 200410047382A CN 100399416 C CN100399416 C CN 100399416C
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Abstract
The present invention provides a device for enhancing the gray scale of a display element, which comprises a signal conversion circuit, an error diffusion circuit and an arithmetic circuit, wherein the signal conversion circuit converts a group of video signals into a group of conversion signals according to a first predetermined mode; the error diffusion circuit receives the group of conversion signals, and generates a group of diffusion signals on the basis of a judgment rule; the arithmetic circuit receives the group of diffusion signals, and generates a group of output video signals according to a second predetermined mode.
Description
Technical field
The present invention relates to a kind of device and method of display element, particularly relates to the device and method that improves display element grey (gray levels).
Background technology
Known plane display element such as PDP (plasma display panel) module is that the half-tone information with 8 (bit) shows 0～255 gray scale when presenting image, just comes show image with 256 gray scales.
See also Fig. 1, Fig. 1 is the synoptic diagram that concerns between known PDP module brightness performance and the gray scale.The brightness performance of known PDP module and the relation between the gray scale are near linear dependence.For example brightness is 512cd/m
2Module, its each adjacent gray scale intensities gradient is 2cd/m
3, i.e. the brightness of gray scale 1 has 2cd/m
2When module brightness promotes one times to 1024cd/m
2The time, then the brightness of gray scale 1 is up to 4cd/m
2Too high when the brightness of minimal gray, can influence the contrast of image.
The brightness of PDP module at present is more and more high, and the too high influence to image of above-mentioned minimal gray brightness is then more and more serious.Therefore, only brightness to be divided into 256 grades be not enough to known PDP module.
Because PDP module gray scale and brightness relationship be near linear dependence, so image signal must be carried out the conversion of Gamma 2.2 when utilizing the PDP module to come ornamental film, just can show correct color when.The image signal of general image is 89 (bit), and the signal of input PDP module also is 8.If image signal is carried out importing the PDP module with 8 signal again after Gamma 2.2 conversions, then many details of low gray scale will disappear because of Gamma 2.2 conversions.For example originally for being distributed in the image of 0～42 tonal range, with 8 bit table now, only be left 0～4 tonal range through Gamma 2.2 conversion backs, lost considerable gray scale details.
In order not allow the loss of detail of low gray scale too many, generally can improve the problem of Gamma 2.2 conversions with the error-diffusion method in space, but the error-diffusion method in space there is no the too high problem of minimal gray brightness that solves.
The brightness of minimal gray is too high following shortcoming.The first, when the low-light level picture,, can think on the human eye vision that pixel is too big, resolution is not good because minimal gray brightness is too high.The second, when hanging down the gray scale details,, can think visually when closely watching that picture has non-persistent noise sense if minimal gray brightness is too high with the error-diffusion method improvement in space.
Therefore the fundamental purpose of the present invention too high problem of minimal gray brightness that is to solve in the known technology and taken place, and reach the purpose that allows the display element grey improve.
Summary of the invention
The object of the present invention is to provide a kind of device that improves the display element grey, can solve the too high problem of display element minimal gray brightness, and improve the grey of display element.
The device of raising display element grey of the present invention comprises a signal change-over circuit, according to the Gamma table of comparisons image signal that is the L position with one group of each signal the conversion signal that to be converted to one group of each signal be the M position; One error diffusion circuit, in order to receive this group conversion signal, and utilize N high-order with remaining (M-N) the individual low level of each signal in this group conversion signal, should organize and change signal and carry out a space error and spread computing, in order to the diffusion signal that to produce one group of each signal be the N position; An and computing circuit, receive this group diffusion signal, and according to one in order to will organize the diffusion signal be converted to this organize each signal be the K position temporary transient signal the table of comparisons and will organize temporary transient signal and mask that one group of each mask comprises P Q*Q matrix carries out computing, in order to produce one group of image output signal, wherein, M＞L, N＞K and Q are more than or equal to 2.
In the device of raising display element grey of the present invention, utilize signal conversion and computing in error diffusion circuit and the computing circuit, can eliminate the too high and space error diffusion method of display element minimal gray brightness and produce the problem of noise sense, and reach the purpose that allows the display element grey improve, therefore make display frame more clear.
Can be further understood by the following detailed description and accompanying drawings about the advantages and spirit of the present invention.
Description of drawings
Fig. 1 is the synoptic diagram that concerns between brightness performance of PDP module and the gray scale.
Fig. 2 improves the system block diagrams of display element grey device for the present invention.
Fig. 3 improves the Gamma table of comparisons synoptic diagram of display element grey device for the present invention.
Fig. 4 improves first table of comparisons synoptic diagram of display element grey device for the present invention.
Fig. 5 improves the synoptic diagram of the algorithm of display element grey device for the present invention.
Fig. 6 A improves the synoptic diagram of embodiment of one group of mask of display element grey device for the present invention.
Fig. 6 B one will carry out the image of 4*4 matrix size of mask operation of the present invention and the synoptic diagram of corresponding matrix thereof.
Fig. 6 C is the synoptic diagram of the matrix of Fig. 6 image after through the mask operation of Fig. 6 A.
Fig. 6 D is the synoptic diagram of the mean flow rate of four frame every bits among Fig. 6 C.
Fig. 7 A improves the synoptic diagram that produces the mask of 0.25 brightness after the correction of display element grey device for the present invention.
Fig. 7 B improves the synoptic diagram that produces the mask of 0.5 brightness after the correction of display element grey device for the present invention.
Fig. 7 C improves the synoptic diagram that produces the mask of 0.75 brightness after the correction of display element grey device for the present invention.
Fig. 8 improves the flow chart of steps of display element grey method for the present invention.
Fig. 9 A improves the measurement data of display element grey method gray-scale value brightness for the present invention.
Fig. 9 B is not for to use the present invention to improve the measurement data of display element grey method gray-scale value brightness.
Figure 10 improves the gray-scale value of display element grey method and the synoptic diagram of brightness for the present invention.
The drawing reference numeral explanation
10: the device that improves the display element grey
12: signal change-over circuit 14: the error diffusion circuit
16: computing circuit 20: image signal
22: conversion signal 24: the diffusion signal
26: the image output signal 41:Gamma table of comparisons
51: the first tables of comparisons
Embodiment
See also Fig. 2, Fig. 2 is the system block diagrams of the device 10 of raising display element grey of the present invention.The device 10 of raising display element grey of the present invention comprises a signal change-over circuit 12, an error diffusion circuit 14 and a computing circuit 16.
Signal change-over circuit 12 is according to one first predetermined way one group image signal 20 to be converted to one group of conversion signal 22.Error diffusion circuit 14 is to change signal 22 in order to receive this group, and produces one group of diffusion signal 24 according to a differentiation rule.Computing circuit 16 is to receive this group diffusion signal 24, and according to one second predetermined way and a predetermined operation rule, produces one group of image output signal 26.
See also Fig. 3, Fig. 3 is the synoptic diagram of the Gamma table of comparisons 41 of device 10 of the raising display element grey of Fig. 1.Below explanation signal change-over circuit 12 is converted to this group image signal 20 first predetermined way of 22 foundations of this group conversion signal.First predetermined way is to utilize a Gamma table of comparisons (look up table), and this group image signal 20 is converted to this group conversion signal 22, and wherein each signal is the L position in this group image signal 20, and each signal is the M position in this group conversion signal 22, and M＞L.One group of 8bit image signal 20, utilize the Gamma table of comparisons to carry out Gamma 2.2 conversion after, export one group of 12bit conversion signal 22, wherein Gao Wei 8bit is used for presenting integral part, and the 4bit of low level is used for presenting fraction part.
In one embodiment, a Gamma table of comparisons 41 as shown in Figure 3.One group of 8bit image signal 20, utilize the Gamma table of comparisons 41 to carry out Gamma 2.2 conversion after, export one group of 12bit conversion signal 22, wherein Gao Wei 8bit is used for presenting the integral part after Gamma changes, and the 4bit of low level is used for presenting fraction part.As shown in Figure 3,42 hurdles are the gray scale of the 8bit image signal of input, 44 hurdles are the gray scale through Gamma 2.2 conversion back images, 46 hurdles by 8bit image signal conversion back the gray scale of energy show image, wherein should be the image of 12bit through Gamma 2.2 conversion back image outputs, utilize 46 hurdles to show the integral part of the gray scale of 8bit image at this, other 4bit then are the fraction part (not shown)s that is used for presenting after gamma 2.2 changes.Utilize this Gamma table of comparisons 41, one group of 8bit image signal can be converted to the conversion signal of one group of 12bit.
Following specification error diffusion circuit 14 produces the differentiation rule of 24 foundations of this group diffusion signal.This differentiation rule is to utilize N high-order with remaining (M-N) individual low level of each signal in this group conversion signal 22, should organize conversion signal 22 and carry out space error diffusion computing, in order to produce this group diffusion signal 24, each signal is the N position in this group diffusion signal 24.
In one embodiment, this group conversion signal 22 is the signal of one group of 12bit.Error diffusion circuit 14 utilization is differentiated rules, carries out space error diffusion computing with the 2bit low level with the 10bit of each signal is high-order, produces the diffusion signal of a 10bit.Therefore error diffusion circuit 14 can produce the diffusion signal 24 of one group of 10bit.
Below explanation computing circuit 16 produces second predetermined way and the predetermined operation rule of 26 bases of this group image output signal.Computing circuit 16 is to utilize second predetermined way should organize diffusion signal 24 to be converted to one group of temporary transient signal 25, organizes temporary transient signal 25 according to predetermined operation rule and this again, produces this group image output signal 26.
Second predetermined way is one first table of comparisons (look up table), is converted to this and organizes temporary transient signal in order to should organize diffusion signal 24, and wherein each signal is the K position in the temporary transient signal of this group, and N＞K.
The predetermined operation rule is this to be organized temporary transient signal and one group of mask (Mask) carries out computing, and to produce this group image output signal 26, wherein each signal is the K position in this group image output signal 26.
In this group mask, each mask comprises P Q*Q matrix, and wherein Q is more than or equal to 2.In an embodiment, this group mask comprises one first, 1 second and 1 the 3rd mask, and P, Q are all 4 in this group mask, and promptly each mask comprises 4 4*4 matrixes.First mask comprises 4 4*4 matrixes.In four matrixes of first mask, it is 1 in the capable matrix element value of i row and j that 3 matrixes are arranged, and all the other 1 matrixes are 0 in the capable matrix element value of i row and j, wherein 1≤i≤4; 1≤j≤4.Second mask comprises 4 4*4 matrixes.In four matrixes of second mask, it is 1 in the capable matrix element value of i row and j that 2 matrixes are arranged, and all the other 2 matrixes are 0 in the capable matrix element value of i row and j, wherein, and 1≤i≤4; 1≤j≤4.The 3rd mask comprises 4 4*4 matrixes.In four matrixes of the 3rd mask, it is 1 in the capable matrix element value of i row and j that 1 matrix is arranged, and all the other 3 matrixes are 0 in the capable matrix element value of i row and j, wherein 1≤i≤4; 1≤j≤4.
See also Fig. 4, Fig. 4 is first table of comparisons, 51 synoptic diagram of device 10 of the raising display element grey of Fig. 1.In one embodiment, comprise three fields in first table of comparisons 51, wherein 52 hurdles are the gray scale of the diffusion signal of input, and 54 hurdles are the gray scale of the temporary transient signal of output, and 56 hurdles are corresponding predetermined operation rule.In this embodiment, the diffusion signal is 10bit, and temporary transient signal is 8bit, and the image greyscale of each input has a corresponding predetermined operation rule in addition.As shown in Figure 4, gray scale image 1,5,9,,, 1016,1020 corresponding predetermined operation rules are mask A, gray scale image value 2,6,10,,, 1017,1021 corresponding algorithms are mask B, gray scale image value 3,7,11...1018,1022 corresponding algorithms are mask C.Mask A is for producing the computing mask of 0.25 brightness, and mask B is for producing the computing mask of 0.5 brightness, and mask C produces 0.75 computing mask.Therefore, by first table of comparisons 51, input 10bit diffusion signal gray scale image value can obtain exporting the temporary transient signal gray scale of 8b it image value, and corresponding predetermined operation rule.
In the device of raising display element grey of the present invention, design one group of time dependent mask, image is output again after mask operation, and so the same point pixel is utilized different mask operation, and its brightness can produce different brightness sensations after time integral.Per second has 60 images in the system of the national TV specification council (NTSC) video-signal system specification, with 60 images of per second the 1st, 5,9,13...57 opens and belongs to frame I, 2nd, 6,10,14...58 opens image and belongs to frame I I, 3rd, 7,11,15...59 opens image and belongs to frame III, the 4th, 8,12,16...60 opens image and belong to frame IV; I, II, respectively corresponding four masks of four frames of III, IV, the image of different frame carries out computing with corresponding mask respectively.By different mask designs, the brightness of unit picture element can produce different brightness sensations after time integral.
It is a kind of embodiment that image is belonged to 4 frames, also image might be divided into other a plurality of frames in other embodiments, specifically carries out the present invention.
See also Fig. 5, Fig. 5 is the synoptic diagram of predetermined operation rule one embodiment of the present invention.In the present embodiment, the image 60 of a 4*4 matrix size and the mask of a 2*2 matrix size 62 carry out mask operation, produce an image 64, are subtraction in the mask operation of present embodiment.In other embodiments, mask operation can be subtraction, additive operation, multiplying ... or other mathematical operations of haveing the knack of.
See also Fig. 6 A to Fig. 6 D.Fig. 6 A is the synoptic diagram of the embodiment of one group of mask of the present invention.Fig. 6 B one will carry out the image 78 of 4*4 matrix size of mask operation of the present invention and the synoptic diagram of corresponding matrix 80 thereof.Fig. 6 C is the image of Fig. 6 D matrix after through the mask operation of Fig. 6 A.Fig. 6 D is the mean flow rate of four frame every bits among Fig. 6 C.
The mask design that 4 4*4 matrixes as shown in Figure 6A are four frames.Matrix 70,72,74,76 is respectively the operation matrix of corresponding frame I, II, III, IV.This embodiment is the brightness reduction by 50% with minimal gray.
Shown in Fig. 6 B, the image 78 of a 4*4 matrix size (a some A1～A16), wherein each opposite position can corresponding each gray scale image value to matrix 80.The image 78 of Fig. 6 B and Fig. 6 A matrix 70,72,74,76 are via after the mask operation, and the result is respectively matrix 82,84,86,88 shown in Fig. 6 C.
Shown in Fig. 6 D, image 78 viewed brightness value after the mask operation of 4 frames is shown in matrix 90.Image 78 is via after the mask operation, A1 o'clock behind 4 frames observed brightness be (0+1+0+1)/4=0.5, A2 o'clock behind 4 frames observed brightness utilize the mask operation of Fig. 6 A for (1+2+1+2)/4=1.5... gray scale 8bit image, after the time of 4 or 4 integral multiple frame, can produce the brightness of gray scale 0.5,1.5,2.5,3.5...254.5, so can make the brightness of minimal gray reduce 50%, and can produce the brightness in the middle of two integer gray scales.
When the design mask operation, note a problem.The image big at area, that brightness is high, large tracts of land is homochromy, or image comparison is when obvious, if note observing the phenomenon that can find the slight flicker of picture.Easier observing on the module that the phenomenon of this slight flicker is low at resolution or pixel is big.Below the reason of explanation film flicker as the mask of Fig. 6 A, with the staggered computing of strange, even level, is that the 30Hz frequency is too low for its computing frequency of odd number horizontal line, that is to say p.s. replacing image very little, therefore perceived by the user easily.For fear of the problem that the continuous pictures appearance of same grayscale is glimmered, being similar to this kind of Fig. 6 A mask strange, that idol is regular can revise.
See also Fig. 4 and Fig. 7 A to Fig. 7 C, Fig. 7 A to Fig. 7 C is the embodiment that is respectively mask of the present invention.Design can produce 0.25 brightness as the mask of Fig. 7 A, can produce 0.5 brightness as the mask design of Fig. 7 B, can produce 0.75 brightness as the mask design of Fig. 7 C.Among Fig. 4, mask A, B and C can adopt the design as Fig. 7 A, Fig. 7 B and Fig. 7 C respectively.
In addition, in order to alleviate the problem that low frequency flicker appears in same color, three kinds of pairing masks of primary colors of red, green, blue can be designed to different masks at same frame, to avoid taking place the problem of low frequency flicker.
The mask design has a rule.Illustrate, if want to design a 4*4 size, produce the mask of 0.75 brightness, it is 1 in the matrix element value that i is listed as and j is capable that 1 matrix is arranged in 4 4*4 matrixes, and all the other 3 matrixes are 0 in the matrix element value that i is listed as and j is capable.If desire produces the mask of 0.5 brightness, it is 1 in the matrix element value that i is listed as and j is capable that 2 matrixes are arranged in 4 4*4 matrixes, and all the other 2 matrixes are 0 in the matrix element value that i is listed as and j is capable.If desire produces the mask of 0.25 brightness, it is 1 in the matrix element value that i is listed as and j is capable that 3 matrixes are arranged in 4 4*4 matrixes, and all the other 1 matrixes are 0 in the matrix element that i is listed as and j is capable, wherein 1≤i≤4; 1≤j≤4.
This mask can be the matrix of the above size of a 2*2.It is less that yet the matrix of 2*2 changes, and is easier to produce the problem of above-mentioned low frequency flicker.Therefore the mask of 4*4 size is preferred embodiment, but also might be the mask of bigger matrix form.
See also Fig. 8, Fig. 8 improves the flow chart of steps of display element grey method for the present invention.The method that the present invention improves the display element grey comprises the following step:
S80: utilize one first predetermined way, a group image signal is converted to one group of conversion signal;
S82: utilize this group conversion signal and, produce one group of diffusion signal according to a differentiation rule;
S84: utilize this second predetermined way should organize the diffusion signal and be converted to one group of temporary transient signal; And
S86: organize temporary transient signal according to this predetermined operation rule and this, produce this group image output signal.
Improve first predetermined way in the display element grey method, second predetermined way, differentiate rule and predetermined operation rule etc. as for the present invention,, do not repeat them here then as above-mentioned explanation and relevant indicators.
See also Fig. 9 A and Fig. 9 B, Fig. 9 A improves the measurement data of display element grey method for using the present invention.Fig. 9 B is not for to use the present invention to improve the measurement data of display element grey method.Fig. 9 A and Fig. 9 B can be used to illustrate and use the present invention to improve the gray scale resolution height that display element grey method is not used raising display element grey method of the present invention.Shown in Fig. 9 A, gray represents gray-scale value in the hurdle, and on behalf of the colourity instrumentation, Y-with measure to use the present invention to improve display element grey method in brightness that this gray-scale value produced.See also Fig. 9 B, the Y-without representative does not use the present invention to improve display element grey method in the measured brightness of this gray-scale value.The present invention that sees that can be very clear and definite by Fig. 9 A and the listed data of Fig. 9 B improves the grey that display element grey method can improve display element really.
See also Figure 10, Figure 10 improves the synoptic diagram of display element grey method for the present invention.As shown in figure 10, be under 0 to 64 the situation at gray-scale value, the relation of gray-scale value and brightness after the curve 90 representative uses raising display element grey method of the present invention, and curve 92 representatives do not use the present invention to improve the gray-scale value of display element grey method and the relation of brightness, this shows, it is comparatively linear that the figure that uses the present invention to improve measured gray-scale value of display element grey method and brightness presents, can represent to use the present invention and improve the grey that display element grey method can effectively improve display element, make the shown image quality of coming out of display element more clear.
The device of raising display element grey of the present invention or method are utilized a table of comparisons and a mask operation, go to adjust the too high problem of minimal gray brightness in the display element automatically, eliminate the problem that display frame produces the noise sense.Therefore use the device and method that the present invention improves the display element grey, can solve known problem, make the display element picture more clear.The present invention improve the device of display element grey or method applicable to plasma scope (plasma display panel, PDP), LCD (liquid crystal display, LCD) ... wait numeral to show product.
By the above detailed description of preferred embodiments, be to wish to know more to describe feature of the present invention and spirit, and be not to come category of the present invention is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that hope can contain in the category of claim of being arranged in of various changes and tool equality institute of the present invention desire application.Therefore, the category of the claim that the present invention applied for should be done the broadest explanation according to above-mentioned explanation, contains the arrangement of all possible change and tool equality to cause it.
Claims (8)
1. device that improves the display element grey, this device comprises:
One signal change-over circuit is according to the Gamma table of comparisons image signal that is the L position with one group of each signal the conversion signal that to be converted to one group of each signal be the M position;
One error diffusion circuit, in order to receive this group conversion signal, and utilize N high-order with remaining (M-N) the individual low level of each signal in this group conversion signal, should organize and change signal and carry out a space error and spread computing, in order to the diffusion signal that to produce one group of each signal be the N position; And
One computing circuit, receive this group diffusion signal, and according to one in order to will organize the diffusion signal be converted to this organize each signal be the K position temporary transient signal the table of comparisons and will organize temporary transient signal and mask that one group of each mask comprises P Q*Q matrix carries out computing, in order to the image output signal that to produce one group of each signal be the K position
Wherein, M＞L, N＞K and Q are more than or equal to 2.
2. device as claimed in claim 1, wherein one first mask comprises 4 4*4 matrixes in this group mask, it is 1 in the capable matrix element value of i row and j that 3 matrixes are arranged in these 4 4*4 matrixes, and all the other 1 matrixes are 0 in the capable value matrix element value of i row and j, wherein 1≤i≤4; 1≤j≤4.
3. device as claimed in claim 1, wherein one second mask comprises 4 4*4 matrixes in this group mask, it is 1 in the capable matrix element value of i row and j that 2 matrixes are arranged in these 4 4*4 matrixes, and all the other 2 matrixes are 0 in the capable matrix element value of i row and j, wherein 1≤i≤4; 1≤j≤4.
4. device as claimed in claim 1, wherein one the 3rd mask comprises 4 4*4 matrixes in this group mask, it is 1 in the capable matrix element value of i row and j that 1 matrix is arranged in these 4 4*4 matrixes, and all the other 3 matrixes are 0 in the capable matrix element value of i row and j, wherein 1≤i≤4; 1≤j≤4.
5. method that improves the display element grey, this method comprises the following step:
(a) utilize a Gamma table of comparisons, with one group of each signal image signal that is the L position conversion signal that to be converted to one group of each signal be the M position;
(b) utilize this group conversion signal and, should organize and change signal and carry out a space error and spread computing, spread signal in order to produce one group according to N high-order with remaining (M-N) the individual low level of each signal in this group conversion signal; And
(c) utilize this to organize the diffusion signal that each signal is the N position, according to one in order to will organize spread signal be converted to this organize each signal be the K position temporary transient signal the table of comparisons and will organize temporary transient signal and mask that one group of each mask comprises P Q*Q matrix carries out computing, in order to the image output signal that to produce one group of each signal be the K position
Wherein, M＞L, N＞K and Q are more than or equal to 2.
6. method as claimed in claim 5, wherein one first mask comprises 4 4*4 matrixes in this group mask, it is 1 in the capable matrix element value of i row and j that 3 matrixes are arranged in these 4 4*4 matrixes, and all the other 1 matrixes are 0 in the capable matrix element value of i row and j, wherein 1≤i≤4; 1≤j≤4.
7. method as claimed in claim 5, wherein one second mask comprises 4 4*4 matrixes in this group mask, it is 1 in the capable matrix element value of i row and j that 2 matrixes are arranged in these 4 4*4 matrixes, and all the other 2 matrixes are 0 in the capable matrix element value of i row and j, wherein 1≤i≤4; 1≤j≤4.
8. method as claimed in claim 5, wherein one the 3rd mask comprises 4 4*4 matrixes in this group mask, it is 1 in the capable matrix element value of i row and j that 1 matrix is arranged in these 4 4*4 matrixes, and all the other 3 matrixes are 0 in the capable matrix element value of i row and j, wherein 1≤i≤4; 1≤j≤4.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020130825A1 (en) * | 2001-01-18 | 2002-09-19 | Lg Electronics Inc. | Method and apparatus for expressing gray level with decimal value in plasma display panel |
| JP2003195801A (en) * | 2001-12-20 | 2003-07-09 | Lg Electronics Inc | Display device and gradation display method |
| CN1487490A (en) * | 2002-07-08 | 2004-04-07 | 三星Sdi株式会社 | Equipment and method for driving plasma display plate to intensify greyscale and colour display |
| KR20040045603A (en) * | 2002-11-25 | 2004-06-02 | 주식회사 유피디 | Image processing device of plasma display panel |
-
2004
- 2004-06-03 CN CNB200410047382XA patent/CN100399416C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020130825A1 (en) * | 2001-01-18 | 2002-09-19 | Lg Electronics Inc. | Method and apparatus for expressing gray level with decimal value in plasma display panel |
| JP2003195801A (en) * | 2001-12-20 | 2003-07-09 | Lg Electronics Inc | Display device and gradation display method |
| CN1487490A (en) * | 2002-07-08 | 2004-04-07 | 三星Sdi株式会社 | Equipment and method for driving plasma display plate to intensify greyscale and colour display |
| KR20040045603A (en) * | 2002-11-25 | 2004-06-02 | 주식회사 유피디 | Image processing device of plasma display panel |
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