WO2002059865A2 - Method and device for displaying images with subfields - Google Patents
Method and device for displaying images with subfields Download PDFInfo
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- WO2002059865A2 WO2002059865A2 PCT/IB2001/002679 IB0102679W WO02059865A2 WO 2002059865 A2 WO2002059865 A2 WO 2002059865A2 IB 0102679 W IB0102679 W IB 0102679W WO 02059865 A2 WO02059865 A2 WO 02059865A2
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Classifications
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
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- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
- G09G3/2059—Display of intermediate tones using error diffusion
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- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
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- G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
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- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
- G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
- G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
- G09G3/2029—Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames having non-binary weights
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
- G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
- G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
- G09G3/2037—Display of intermediate tones by time modulation using two or more time intervals using sub-frames with specific control of sub-frames corresponding to the least significant bits
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- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
- G09G3/294—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge
- G09G3/2948—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge by increasing the total sustaining time with respect to other times in the frame
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0202—Addressing of scan or signal lines
- G09G2310/0205—Simultaneous scanning of several lines in flat panels
- G09G2310/021—Double addressing, i.e. scanning two or more lines, e.g. lines 2 and 3; 4 and 5, at a time in a first field, followed by scanning two or more lines in another combination, e.g. lines 1 and 2; 3 and 4, in a second field
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- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0202—Addressing of scan or signal lines
- G09G2310/0221—Addressing of scan or signal lines with use of split matrices
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/2803—Display of gradations
Definitions
- the invention relates to a method of displaying images on a subfield driven matrix display device, including plasma display panels (PDPs), plasma-addressed liquid crystal panels (PALCs), liquid crystal displays (LCDs), Polymer LED (PolyLEDs), Electroluminescent (EL), used for personal computers, television sets, etc.
- PDPs plasma display panels
- PLCs plasma-addressed liquid crystal panels
- LCDs liquid crystal displays
- PolyLEDs Polymer LED
- EL Electroluminescent
- the invention further relates to a display device comprising a receiving circuit for receiving luminance data comprising original luminance value data of pixels, the display device further comprising a display panel comprising a set of lines r ⁇ ...vu, and a driver circuit for supplying line luminance value data to said lines, said lines being grouped in sets of neighboring or adjacent lines, wherein a common value for the multiple line addressed sub- fields is addressed simultaneously to a set of lines.
- the present invention provides a method of displaying successive image frames or fields on a matrix display device, said display device comprising a predetermined number of display lines each including a predetermined number of picture elements, wherein said pixels are coded in subfields and said matrix display device is driven by said subfields and wherein the luminance values to be displayed are derived from original luminance values having a higher number of bits or grey levels than the number of bits or grey levels to be displayed by a pixel element, said method further comprising the following steps:
- the partial line doubling is shifted to less significant subfields, however, excluding the one, two or more least significant subfields so that these subfields can be used for dithering.
- addressing of a set of adjacent lines is performed differently for successive frames or fields, and/or for different regions of the display device and/or for different subfields. By grouping the lines differently into successive frames and to different areas of the display, the address period is further reduced, avoiding loss of resolution.
- FIG. 1 schematically illustrates a prior art method (single line addressing);
- Fig. 2 shows a subfield distribution, and the time gain obtained by double line addressing of the three least significant subfields
- FIG. 3 schematically illustrates a method in which double line addressing is used
- Fig. 4 schematically illustrates a method, in which double line and double frame addressing are used
- Fig. 5 schematically illustrates methods in which different multiple line and multiple frame addressing are used
- Fig. 6 schematically illustrates methods in various combinations
- Fig. 7 schematically illustrates a method according to the invention in which double surface addressing is used
- Fig. 8 shows a block diagram of a display apparatus according to an embodiment of the invention.
- Fig. 9 schematically shows a matrix display device;
- Fig. 10 schematically shows an embodiment of the invention, with a numerical example
- FIG. 11 schematically shows a simplified embodiment of the invention, applicable to binary sub-fields, a numerical example being shown in Fig 12;
- Figs. 13 and 14 schematically show simplified embodiments, applied to non- binary sub-fields;
- Fig. 15 shows a diagram to structurate Floyd-Steinberg error diffusion
- Fig. 16A resp. 16B show subfield doubling schemes for explaining the present invention
- Fig. 17 shows numerical examples of a preferred embodiment of a method according to the present invention
- Fig. 18 shows a implementation example for a preferred method of the present invention.
- Fig. 19 shows a further implementation example for a preferred method of the present invention.
- a matrix display panel such as a plasma display panel comprises a set of data electrodes usually extending in the column direction and a set of scanning electrodes usually extending in the row direction.
- Fig. 1 shows a display panel, where each row is addressed individually. Two electrodes are associated with each row; an address electrode Ae and a common electrode Ce. The arrow indicates the addressed row Ra.
- the address time Ta,n may be reduced by the so-called line-doubling method, applied to some of the least significant subfields, and this is shown in the lower half of Fig. 2.
- a field, as shown in Fig. 2 comprises, say, 8 subfields (in practice, 6 up to 12 subfields are used).
- Each subfield may comprise an erase period for conditioning the panel, an address period for priming the cells that should be lit during sustaining, and a sustain period during which the actual light is generated.
- the sustain period of each subfield is given, for example, a weight of 128, 64, 32, 16, 8, 4, 2, or 1 corresponding to an 8-bit digital signal (b7,b6,b5,b4,b3,b2,bl) and allowing to obtain 256 luminance levels.
- the total sustain period for one field should be as long as possible in order to obtain a high brightness.
- the address period is about 3 ⁇ s per line.
- the total address period is therefore 12 ms.
- a field rate of 60Hz period 16.6 ms
- only 3ms is left as the total sustain period per field.
- Fig.3 shows how two adjacent rows Ra ⁇ and Ra 2 are addressed at the same time, with the same data.
- the address time Ta,s is thereby reduced, leaving more time for the sustain period S.
- the high bars referred to as E represent the erase periods.
- the triangles referred to as A represent the address periods, and the rectangles referred to as S represent the sustain periods.
- the line doubling which occurs during the period Td causes a time gain Tg which can be used to increase the duration of the sustain period S or to increase the number of subfields.
- Fig. 4 shows an example where lines are grouped in line pairs for odd fields, and in other pairs of lines, shifted by one line, for even fields.
- Fig. 5 shows, (upper left example) how, for all frames and all subfields, the lines are grouped in pairs (double line, single frame addressing).
- lines are grouped in pairs of lines in odd frames, and in shifted pairs of lines in even frames (double line, dual frame addressing).
- lines are grouped in sets of three lines for all frames and some subfield(s) (triple line, single frame addressing). The addressing time for said subfield(s), is thereby reduced to one third.
- lines are grouped in sets of three lines in odd frames, and in other sets of three lines, shifted by one line, for even frames (triple line, dual frame addressing).
- the last example of Fig. 5 shows triple line, triple frame addressing. The sets of three lines are shifted by one line for each successive frame.
- Fig 6 shows further examples of valid combinations.
- double line addressing is used in odd frames or in the odd fields, and single line addressing is used in even frames or in the even fields.
- triple line, triple frame addressing is interspersed with double line, double frame addressing.
- the above methods may be applied differently for each subfield.
- the loss of definition resulting from triple line addressing may be acceptable if using triple (or higher- multiple) line addressing for the lowest least significant subfields, and double line addressing for the higher least significant subfields.
- Fig. 7 shows an example of a display device that is independently addressable in the upper and the lower half regions (U and L). In this example, one method is applied for the upper half region, and another method is applied for the lower half region, for one frame or field, and the methods are reversed for the next successive frame or field.
- FIG. 8 shows a block diagram of a display apparatus.
- a subfield driven matrix display device DD has row conductors RC selected by an addressing circuit AC.
- a data supplying circuit DC receives image data ID to supply data to column conductors CD.
- a control circuit CC controls the addressing circuit AC and the data supplying circuit DC.
- control circuit CC instructs the addressing circuit AC to address (select) two adjacent row conductors and instructs the data supplying circuit to supply the same data to the selected row conductors to prime two rows with the same data.
- Fig. 9 is a schematic diagram of a device comprising a matrix display panel 5, showing a set of display lines (rows) ri, r , ....r m .
- the matrix display panel 5 comprises a set of data lines (columns) ⁇ ..CN extending in a second direction, usually called the column direction, intersecting the first set of data lines, each intersection defining a pixel (dot) dii d M -
- the number of rows and columns need not be the same.
- the matrix display furthermore comprises a circuit 2 for receiving an information signal D comprising information on the luminance of lines to be displayed and a driver circuit 4 for addressing the set of data lines (rows r l5 ... ⁇ M) in dependence on the information signal D, which signal comprises original line luminance values D l ..DM-
- the display device in accordance with the invention comprises a computing unit (3) for computing new line luminance values C of pixels d ll ..d NM on the basis of original line luminance values D ls D 2 ,.. D m .
- the error can be reduced to a value lower than 8 by changing the values of the more significant sub-fields.
- the value of the more significant sub-fields can be changed.
- A is the original data of a first line of a pair of lines to be displayed
- a is the weight of the less significant sub-fields of said first line
- B is the original data of the other line of said pair of lines
- b is the weight of the less significant sub-fields of said line
- A is the new data for said first line
- B' is the new data for said other line
- r is a real number
- n is the number of doubled less significant sub-fields.
- the new values A' and B' obtained in accordance with this method have the same less significant sub-fields. This calculation method will provide good results. However, when the original values of A and B are almost equal to 0 or 255 (minimum and maximum values, when using 8 binary sub-fields), problems of over-ranging can appear.
- the new values are completely wrong (over-ranging). Better values may be obtained, by taking, in this case, the average value of the less significant sub-fields.
- Fig 10 schematically shows a numerical example also applicable to non-binary sub-fields.
- Eight sub-fields having weights 12, 12, 8, 8 (more significant sub-fields) and 4, 4, 2, 1 (least significant sub-fields) are used.
- “A” is the weight of the more significant sub-fields of the original data of a first line of a pair of lines to be displayed
- "a" is the weight of the less significant sub-fields of said first line
- “B” is the weight of the more significant sub-fields of the original data of the other line of said pair of lines to be displayed
- "b” is the weight of the less significant sub-fields of said line.
- the method comprises the steps of: (a) computing lsb_max as the addition of the weights of all less significant sub-fields (in this case 4+4+2+1, being 11);
- a value errorjtnax is computed, determined or set, errorjmax being half the weight of the lowest more significant sub-field (in this case error_max is equal to 4).
- the values comprised between minus errorjnax and lsb_max+error_max are selected as a reduced first difference set (only these values are shown in the diagram, here 3, 7 and 11)
- the values between minus errorjnax and lsb_max+error_max are selected as a reduced second difference set (again only these values are shown in the diagram, here —4, 0, 4, 12)
- step e determining, among all pairs of values, the first one being taken from the reduced first differences set and the second one being taken from the reduced second differences set, the pairs of values, so that the absolute value of their difference is minimum among all said pairs ('minimal pairs') (in this case the minimum is 1 and may be obtained by taking the
- Steps (d) and (e) may be performed more easily if the MSB table is first sorted, and duplicate values are eliminated, as shown in Fig. 10.
- the error is equal for both solutions.
- the first solution is displayed in bold on Fig. 2.
- parameter r may be chosen for spreading the error differently between the two lines.
- non-binary sub-fields the relationship between luminance values, and sub-field combination is not one-to-one, as with binary sub-fields.
- the value 20 may be obtained by e.g.
- the method provides values for the more significant fields which are obtainable by a combination of more significant fields. This method provides new values to be displayed, reducing the error and spreading the error evenly among the first and the subsequent line.
- Step (d) and (e) are performed for each line of the set of lines.
- step (h) a set of values is searched among all combinations of differences sets, which gives the smallest differences.
- Step (i) is also performed for each line of the set of lines.
- the weight of the less significant sub-fields is extracted (LSB-part).
- the new luminance value data of a second line of a pair of lines For the new luminance value data of a second line of a pair of lines, one takes the computed weight for the more significant sub-fields, and LSB for the less significant sub- fields.
- the original value of a first line is 3 (0000 0011 in binary)
- the original value of a second line is 141 (1000 1101 in binary).
- the first value is simply copied.
- the less significant sub-fields ( 0011 in binary) are extracted.
- a new value for the more significant sub-fields of the second line is obtained by subtracting the LSB from the original value for the second line.
- the rounding may be performed by adding half the value of the lower more significant field, in this case 8, and taking the more significant sub-fields thereof.
- this method also applies to non-binary sub-fields. This method may be improved by taking, as the first line, the line with the smallest LSB sub-fields.
- All of these methods may easily be implemented in a programming language, the program having, as input, the original luminance values to be displayed, and, as output, the new luminance values.
- a look-up table mechanism may be used.
- a table ('look-up table') has an entry for each pair of values of the original luminance values, and contains the corresponding precalculated pair of new values.
- the look-up table may be very large, i.e. 256X256 elements for 8 bits binary sub-fields.
- a smaller look-up table may be used, having, as shown in Fig. 13, an entry for each combination of values of the second line and of values of the LSB-part, i.e. 256X16 elements for 8 bits binary sub-fields.
- a substantial reduction of the look-up table size is thereby obtained. This method is applicable to non-binary sub-fields.
- the size of the look-up table is further reduced: one computes the difference between the luminance value for the second line, and the luminance value corresponding to the LSB part. This difference is used as input in a look-up table for giving the new most significant fields.
- the description above is also substantially part of co-pending patent applications from applicant.
- the above subject matter can be incorporated in the following preferred embodiment of the present invention.
- the limited number of subfields of a matrix display also limits the number of grey levels that can be displayed by such matrix display.
- the Human Visual System integrates light coming from neighboring pixels into one luminance level. Dithering uses this property by displaying high spatial frequencies which are perceived as a certain grey level. In this way the number of perceived grey levels can be enhanced.
- Floyd-Steinberg error diffusion is used - see for instance R.W. Floyd and L. Steinberg: An adaptive algorithm for spatial grayscale Proceedings of SID Vol 17/2 pp. 75, 1976. This error diffusion algorithm is schematically shown in fig. 15.
- the original image data consist of more grey levels than can be displayed on e.g. a Plasma Display Panel (PDP)
- PDP Plasma Display Panel
- This error is distributed over the surrounding pixels: 7/16 of the error to pixel A, 1/16 of the error to pixel B, 5/16 of the error to pixel C and 3/16 of the error to pixel D.
- the resulting luminance will be close to the intended luminance because of the above mentioned integration/ effect of the Human Visual System.
- the present invention makes it possible to combine Partial Line Doubling (PLD) and dithering.
- PLD Partial Line Doubling
- the quality of the dithering will depend largely on the subfield with the lowest weight. Dark areas will be critical for the dithering quality due to the non-linear perception of the Human Visual System. The human eye is more sensitive for luminance changes at low luminance values than at high luminances values. If, however, PLD is performed after the dithering, experiences have shown that the picture quality is deteriorated as compared to a picture with only error diffusion. The resolution limitation due to PLD is especially visible for the human eye in the dark areas, as always two adjacent least significant subfields are turned on simultaneously.
- fig. 16 the combination of dithering and Partial Line Doubling according to the present invention is shown.
- Fig. 16A shows Partial Line Doubling for two subfields with the lowest value.
- fig. 16B the least significant subfield is used for dithering, preferably using resolution while the next subfields are doubled according to Partial Line Doubling.
- Fig. 17 gives a few examples of data.
- the doubled subfields are printed bold.
- the first column shows the original data and the second column shows the data after Partial Line Doubling.
- the third column shows the Partial Line Doubling shifted relative to the less significant subfield over one bit position.
- the fourth column shows the data with correction whereby the error is minimized.
- the correction can be simple the subfields with the lowest weights that are not doubled (in this example only the least significant subfield) are called the Least Significant Part (LSP).
- the subfields that are involved in the Partial Line Doubling algorithm (in this example the 7 more significant subfields) are called the MSP-part. If the MSP-part has a higher value after Partial Line Doubling, the LSP should be set to zero, while the LSP should be set to one if the value of the MSP-part is lower after Partial Line Doubling.
- Fig. 18 shows the preferred embodiment of the algorithm for the method according to the present invention.
- the data from an odd line e are first dithered di, subsequently delayed (T) over one line interval and combined with the even line data e' 2 which have also been dithered d 2 , so that Partial Line Doubling including correction (PLD & Cor) can be executed while the one or two least significant subfields are reserved for dithering. Thereafter the data for the even line are also delayed (T) over a time interval T before data e' ⁇ and e 2 are being supplied together to a matrix display panel, in the present preferred embodiment a plasma display panel.
- the luminance data of both lines of the pair of lines is used to calculate the values of the double line addressed subfields. This can be done by taking the average value of the double line addressed subfields. Another option is to choose the values of the double line addressed subfields of the line with the lowest luminance data values. Another option is to choose the values of the double line addressed subfields of the line where these subfields have the lowest values.
- the values of the single line addressed subfields can be determined by calculating the luminance that is already displayed on both lines by the double line addressed subfields (grey LUT) and subtracting this value from the original intended luminance of both lines.
- the result is used as an entry of a LUT (Look Up Table) that gives the closest combination of single line addressed subfields.
- LUT Look Up Table
- the final subfield data of both lines can de determined by joining the values of the double line addressed subfields with the values of the single line addressed subfields of both lines.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01273471A EP1374213A2 (en) | 2001-01-25 | 2001-12-19 | Method and device for displaying images on a matrix display device |
JP2002560113A JP2004518176A (en) | 2001-01-25 | 2001-12-19 | Method and device for displaying an image on a matrix display device |
KR1020027012662A KR20020087423A (en) | 2001-01-25 | 2001-12-19 | Method and device for displaying images on a matrix display device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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EP01200272.1 | 2001-01-25 | ||
EP01200272 | 2001-01-25 |
Publications (2)
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WO2002059865A2 true WO2002059865A2 (en) | 2002-08-01 |
WO2002059865A3 WO2002059865A3 (en) | 2003-10-16 |
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PCT/IB2001/002679 WO2002059865A2 (en) | 2001-01-25 | 2001-12-19 | Method and device for displaying images with subfields |
Country Status (6)
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US (1) | US6727913B2 (en) |
EP (1) | EP1374213A2 (en) |
JP (1) | JP2004518176A (en) |
KR (1) | KR20020087423A (en) |
CN (1) | CN1475004A (en) |
WO (1) | WO2002059865A2 (en) |
Cited By (2)
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EP1565901A2 (en) * | 2002-08-19 | 2005-08-24 | Koninklijke Philips Electronics N.V. | Video circuit |
CN104683773A (en) * | 2015-03-25 | 2015-06-03 | 成都好飞机器人科技有限公司 | Video high-speed transmission method using unmanned aerial vehicle |
Families Citing this family (12)
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JP2003043991A (en) * | 2001-08-02 | 2003-02-14 | Fujitsu Hitachi Plasma Display Ltd | Plasma display device |
JP4144665B2 (en) * | 2002-08-30 | 2008-09-03 | 株式会社日立プラズマパテントライセンシング | Driving method of plasma display panel |
JP2005024912A (en) * | 2003-07-02 | 2005-01-27 | Pioneer Electronic Corp | Driver device for display panel |
US7286146B2 (en) * | 2003-11-25 | 2007-10-23 | Alcon, Inc. | Method and system for LED temporal dithering to achieve multi-bit color resolution |
EP1553549A1 (en) * | 2004-01-07 | 2005-07-13 | Deutsche Thomson-Brandt GmbH | Method and device for applying special coding on pixel located at the border area of a plasma display |
KR100612388B1 (en) * | 2004-08-30 | 2006-08-16 | 삼성에스디아이 주식회사 | Display device and driving method thereof |
KR100639034B1 (en) | 2005-03-09 | 2006-10-25 | 엘지전자 주식회사 | multi-scan apparatus and method for plasma display panel |
CN101231402B (en) * | 2007-01-26 | 2012-09-26 | 群康科技(深圳)有限公司 | Liquid crystal display panel |
WO2012098904A1 (en) * | 2011-01-20 | 2012-07-26 | パナソニック株式会社 | Image display device and drive method for image display device |
US8659701B2 (en) * | 2011-12-19 | 2014-02-25 | Sony Corporation | Usage of dither on interpolated frames |
US9818336B2 (en) | 2016-03-22 | 2017-11-14 | Snaptrack Inc. | Vector dithering for displays employing subfields having unevenly spaced gray scale values |
US10319279B2 (en) | 2016-06-13 | 2019-06-11 | Apple Inc. | Spatial temporal phase shifted polarity aware dither |
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EP0874349A1 (en) * | 1997-04-25 | 1998-10-28 | THOMSON multimedia | Process for adressing bits on more than one line of a plasma display |
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JPH03274963A (en) * | 1990-03-26 | 1991-12-05 | Canon Inc | Facsimile equipment |
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GB9809200D0 (en) * | 1998-04-29 | 1998-07-01 | Sharp Kk | Light modulating devices |
GB2336931A (en) | 1998-04-29 | 1999-11-03 | Sharp Kk | Temporal dither addressing scheme for light modulating devices |
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2001
- 2001-12-19 KR KR1020027012662A patent/KR20020087423A/en not_active Application Discontinuation
- 2001-12-19 WO PCT/IB2001/002679 patent/WO2002059865A2/en not_active Application Discontinuation
- 2001-12-19 JP JP2002560113A patent/JP2004518176A/en not_active Abandoned
- 2001-12-19 CN CNA018100961A patent/CN1475004A/en active Pending
- 2001-12-19 EP EP01273471A patent/EP1374213A2/en not_active Withdrawn
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EP0874349A1 (en) * | 1997-04-25 | 1998-10-28 | THOMSON multimedia | Process for adressing bits on more than one line of a plasma display |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1565901A2 (en) * | 2002-08-19 | 2005-08-24 | Koninklijke Philips Electronics N.V. | Video circuit |
JP2005536924A (en) * | 2002-08-19 | 2005-12-02 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Video circuit |
US8537076B2 (en) | 2002-08-19 | 2013-09-17 | Entropic Communications, Inc. | Video circuit |
CN104683773A (en) * | 2015-03-25 | 2015-06-03 | 成都好飞机器人科技有限公司 | Video high-speed transmission method using unmanned aerial vehicle |
CN104683773B (en) * | 2015-03-25 | 2017-08-25 | 北京真德科技发展有限公司 | UAV Video high speed transmission method |
Also Published As
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JP2004518176A (en) | 2004-06-17 |
US6727913B2 (en) | 2004-04-27 |
US20020145619A1 (en) | 2002-10-10 |
KR20020087423A (en) | 2002-11-22 |
EP1374213A2 (en) | 2004-01-02 |
CN1475004A (en) | 2004-02-11 |
WO2002059865A3 (en) | 2003-10-16 |
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