Process for producing shaded colored images using dithering techniques

Claim 2

In a color display apparatus having an array of picture elements each including plural picture sub-elements each of a different color and each having more than two display states selected between using at least two input terminals, each of which has two possible inputs, an ON input and an OFF input, a method of simulating display colors in addition to a number of display colors otherwise available using said color display apparatus, comprising the steps of: modulating an ON/OFF duty cycle of a least significant one of said at least two input terminals of each picture sub-element of the array of picture elements during a multi-frame display sequence according to attribute information of respective picture element data to be displayed; and coordinating the timing of ON/OFF and OFF/ON input transitions on said least significant input terminal of each picture sub-element within each of a plurality of predetermined display neighborhoods throughout the array of picture elements such that said input transitions cause state transitions of said picture sub-elements to occur substantially uniformly in space and time, within each display neighborhood, during the multi-frame display sequence wherein said color display apparatus is a thin-film transistor LCD display, wherein each picture element has at least eight display states selected between using at least three input terminals, wherein said multi-frame sequence is 64 frames long and is logically divided into four sub-sequences each 16 frames long, wherein 260 shades of each picture sub-element are realized by causing the ON/OFF duty cycle of said least significant input terminal of each picture sub-element to have a value within the set {0, 1/64, 2/64, . . . , 64/64}, and wherein the ON/OFF duty cycle of said least significant input terminal of each picture sub-element during each of said four 16-frame sub-sequences of said 64 frame sequence is caused to have a value within the set {0, 1/16, 2/16, . . . , 16/16}.

Claim 3

The method of claim 1 comprising the further step of allowing the ON/OFF duty cycle of said least significant input terminal of each picture sub-element during each of said four 16-frame sub-sequences of said 64 frame sequence to assume one of two adjacent values only within the set {0, 1/16, 2/16, . . . , 16/16}.

Claim 4

The method of claim 1 comprising the further step of allowing the ON/OFF duty cycle of said least significant input terminal of each picture sub-element during at least one, but not all, of said four 16-frame sub-sequences of said 64 frame sequence to assume only a first of two adjacent values within the set {0, 1/16, 2/16, . . . , 16/1} and allowing the duty cycle of said least significant input terminal of each picture sub-element during the others of said four 16-frame sequences to assume only a second of said two adjacent values.

Claim 5

In a color display apparatus having an array of picture elements each including plural picture sub-elements each of a different color and each having more than two display states selected between using at least two input terminals, each of which has two possible inputs, an ON input and an OFF input, a method of simulating display colors in addition to a number of display colors otherwise available using said color display apparatus, comprising the steps of: modulating an ON/OFF duty cycle of a least significant one of said at least two input terminals of each picture sub-element of the array of picture elements during a multi-frame display sequence according to attribute information of respective picture element data to be displayed; and coordinating the timing of ON/OFF and OFF/ON input transitions on said feast significant input terminal of each picture sub-element within each of a plurality of predetermined display neighborhoods throughout the array of picture elements such that said input transitions cause state transitions of said picture sub-elements to occur substantially uniformly in space and time, within each display neighborhood, during the multi-frame display sequence wherein said color display apparatus is a thin-film transistor LCD display, wherein each picture element has at least eight display states selected between using at least three input terminals, wherein said multi-frame sequence is M×N frames long, M and N being integers, and is logically divided into M sub-sequences each N frames long, wherein M×N+1 shades of each picture sub-element are realized by causing the ON/OFF duty cycle of said least significant input terminal of each picture sub-element to have a value within the set {0, 1/M×N, 2/M×N, M×N/M×N}, and wherein the ON/OFF duty cycle of said least significant input terminal of each picture sub-element during each of said M N-frame sub-sequences of said M×N frame sequence is caused to have a value within the set {0, 1/N, 2/N, . . . , N/N}.

Claim 6

In a color display apparatus having an array of picture elements each including plural picture sub-elements each of a different color and each having more than two display states selected between using at least two input terminals, each of which has two possible inputs, an ON input and an OFF input, a method of simulating display colors in addition to a number of display colors otherwise available using said color display apparatus, comprising the steps of: modulating an ON/OFF duty cycle of a least significant one of said at least two input terminals of each picture sub-element of the array of picture elements during a multi-frame display sequence according to attribute information of respective picture element data to be displayed; and coordinating the timing of ON/OFF and OFF/ON input transitions on said feast significant input terminal of each picture sub-element within each of a plurality of predetermined display neighborhoods throughout the array of picture elements such that said input transitions cause state transitions of said picture sub-elements to occur substantially uniformly in space and time, within each display neighborhood, during the multi-frame display sequence wherein said color display apparatus is a thin-film transistor LCD display, wherein each picture element has at least eight display states selected between using at least three input terminals, wherein said multi-frame sequence is M×N frames long, M and N being integers, and is logically divided into M sub-sequences each N frames long, wherein M×N+1 shades of each picture sub-element are realized by causing the ON/OFF duty cycle of said least significant input terminal of each picture sub-element to have a value within the set {0, 1/M×N, 2/M×N, M×N/M×N}, and wherein the ON/OFF duty cycle of said least significant input terminal of each picture sub-element during each of said M N-frame sub-sequences of said M×N frame sequence is caused to have a value within the set {0, 1/N, 2/N, . . . , N/N}.

Claim 7

The method of claim 4 comprising the further step of allowing the duty cycle of said least significant input terminal of each picture sub-element during each of said M N-frame subsequences of said M×N frame sequence to assume one of two adjacent values only within the set {0, 1/N, 2/N, N/N}.

Claim 8

The method of claim 4 comprising the further step of allowing the duty cycle of said least significant input terminal of each picture sub-element during at least one, but not all, of said M N-frame sub-sequences of said M×N frame sequence to assume only a first of two adjacent values within the set {0, 1/N, 2/N, . . . , N/N} and allowing the duty cycle of said least significant input terminal of each picture sub-element during the others of said M N-frame sub-sequences to assume only a second of said two adjacent values.

Claim 11

The method of claim 7 comprising the further step of allowing the duty cycle of each picture sub-element during each of said four sixteen-frame sub-sequences of said sixty-four-frame sequence to assume one of two adjacent values only, within the set {0, 1/16, 2/16, . . . , 16/16}.

Claim 12

The method of claim 7 comprising the further step of allowing the duty cycle of each picture sub-element during at least one, but not all, of said four sixteen-frame sub-sequences of said sixty-four-frame sequence to assume only a first of two adjacent values within the set {0, 1/16, 2/16, . . . , 16/16} and allowing the duty cycle of each picture element during the others of said four sixteen-frame sub-sequences of said sixty-four-frame sequence to assume only a second of said two adjacent values.

Claim 15

The method of claim 10, comprising the further step of allowing the duty cycle of each picture sub-element during each of said M N-frame sub-sequences of said M×N frame sequence to assume one of two adjacent values only, within the set {0, 1/M, 2/M . . . M/M}.

Claim 16

The method of claim 10, comprising the further step of allowing the duty cycle of each picture sub-element during at least one, but not all, of said M-frame sub-sequences of said M×N frame sequence to assume only a first of two adjacent values within the set {0, 1/M, 2/M . . . M/M} and allowing the duty cycle of each picture sub-element during the other of said M N-frame sub-sequences of said M×N frame sequence to assume only a second of said two adjacent values.

Claim 17

A color display apparatus having an array of picture elements each including plural picture sub-elements each of a different color and each having more than two display states selected between using at least two input terminals, each of which has two possible inputs, an ON input and an OFF input, said apparatus comprising: modulating means for modulating an ON/OFF duty cycle of a least significant one of said at least two input terminals of each picture sub-element of the array of picture elements during a multi-frame display sequence according to attribute information of respective picture element data to be displayed; and coordinating means for coordinating the timing of ON/OFF and OFF/ON input transitions on said least significant input terminal of each picture sub-element within each of a plurality of predetermined display neighborhoods throughout the array of picture elements such that said input transitions cause state transitions of said picture sub-elements to occur substantially uniformly in space and time, within each display neighborhood, during the multi-frame display sequence whereby said color display apparatus simulates display colors in addition to a number of display colors that would otherwise be available using said color display apparatus wherein said color display apparatus has a thin-film transistor LCD display, wherein each picture element has at least eight display states selected between using at least three input terminals, wherein said multi-frame sequence is 64 frames long and is logically divided into four sub-sequences each 16 frames long, wherein 260 shades of each picture sub-element are realized by causing the ON/OFF duty cycle of said least significant input terminal of each picture sub-element to have a value within the set {0, 1/64, 2/64, . . . , 64/64}, wherein the ON/OFF duty cycle of said least significant input terminal of each picture sub-element during each of said four 16-frame sub-sequences of said 64 frame sequence is caused to have a value within the set {0, 1/16, 2/16, . . . , 16/16}.

Claim 18

A color display apparatus having an array of picture elements each including plural picture sub-elements each of a different color and each having more than two display states selected between using at least two input terminals, each of which has two possible inputs, an ON input and an OFF input, said apparatus comprising: modulating means for modulating an ON/OFF duty cycle of a least significant one of said at least two input terminals of each picture sub-element of the array of picture elements during a multi-frame display sequence according to attribute information of respective picture element data to be displayed; and coordinating means for coordinating the timing of ON/OFF and OFF/ON input transitions on said least significant input terminal of each picture sub-element within each of a plurality of predetermined display neighborhoods throughout the array of picture elements such that said input transitions cause state transitions of said picture sub-elements to occur substantially uniformly in space and time, within each display neighborhood, during the multi-frame display sequence whereby said color display apparatus simulates display colors in addition to a number of display colors that would otherwise be available using said color display apparatus wherein said color display apparatus has a thin-film transistor LCD display, wherein each picture element has at least eight display states selected between using at least three input terminals, wherein said multi-frame sequence is 64 frames long and is logically divided into four sub-sequences each 16 frames long, wherein 260 shades of each picture sub-element are realized by causing the ON/OFF duty cycle of said least significant input terminal of each picture sub-element to have a value within the set {0, 1/64, 2/64, . . . , 64/64}, wherein the ON/OFF duty cycle of said least significant input terminal of each picture sub-element during each of said four 16-frame sub-sequences of said 64 frame sequence is caused to have a value within the set {0, 1/16, 2/16, . . . , 16/16}.

Claim 19

The apparatus of claim 13, further comprising: means for allowing the ON/OFF duty cycle of said least significant input terminal of each picture sub-element during each of said four 16-frame sub-sequences of said 64 frame sequence to assume one of two adjacent values only within the set {0, 1/16, 2/16, . . . , 16/16}.

Claim 20

The apparatus of claim 13, further comprising: means for allowing the ON/OFF duty cycle of said least significant input terminal of each picture sub-element during at least one, but not all, of said four 16-frame sub-sequences of said 64 frame sequence to assume only a first of two adjacent values within the set {0, 1/16, 2/16, . . . , 16/1} and allowing the ON/OFF duty cycle of said least significant input terminal of each picture sub-element during the others of said four 16-frame sub-sequences of said 64 frame sequence to assume only a second of said two adjacent values.

Claim 21

A color display apparatus having an array of picture elements each including plural picture sub-elements each of a different color and each having more than two display states selected between using at least two input terminals, each of which has two possible inputs, an ON input and an OFF input, said apparatus comprising: modulating means for modulating an ON/OFF duty cycle of a least significant one of said at least two input terminals of each picture sub-element of the array of picture elements during a multi-frame display sequence according to attribute information of respective picture element data to be displayed; and coordinating means for coordinating the timing of ON/OFF and OFF/ON input transitions on said least significant input terminal of each picture sub-element within each of a plurality of predetermined display neighborhoods throughout the array of picture elements such that said input transitions cause state transitions of said picture sub-elements to occur substantially uniformly in space and time, within each display neighborhood, during the multi-frame display sequence whereby said color display apparatus simulates display colors in addition to a number of display colors that would otherwise be available using said color display apparatus wherein said color display apparatus has a thin-film transistor LCD display, wherein each picture element has at least eight display states selected between using at least three input terminals, wherein said multi-frame sequence is M×N frames long, M and N being integers, and is logically divided into M sub-sequences each N frames long, wherein M×N+1 shades of each picture sub-element are realized by causing the ON/OFF duty cycle of said least significant input terminal of each picture sub-element to have a value within the set {0, 1/M×N, 2/M×N, M×N/M×N}, wherein the ON/OFF duty cycle of said least significant input terminal of each picture sub-element during each of said M N-frame sub-sequences of said M×N frame sequence is caused to have a value within the set {0, 1/N, 2/N, . . . , N/N}.

Claim 22

A color display apparatus having an array of picture elements each including plural picture sub-elements each of a different color and each having more than two display states selected between using at least two input terminals, each of which has two possible inputs, an ON input and an OFF input, said apparatus comprising: modulating means for modulating an ON/OFF duty cycle of a least significant one of said at least two input terminals of each picture sub-element of the array of picture elements during a multi-frame display sequence according to attribute information of respective picture element data to be displayed; and coordinating means for coordinating the timing of ON/OFF and OFF/ON input transitions on said least significant input terminal of each picture sub-element within each of a plurality of predetermined display neighborhoods throughout the array of picture elements such that said input transitions cause state transitions of said picture sub-elements to occur substantially uniformly in space and time, within each display neighborhood, during the multi-frame display sequence whereby said color display apparatus simulates display colors in addition to a number of display colors that would otherwise be available using said color display apparatus wherein said color display apparatus has a thin-film transistor LCD display, wherein each picture element has at least eight display states selected between using at least three input terminals, wherein said multi-frame sequence is M×N frames long, M and N being integers, and is logically divided into M sub-sequences each N frames long, wherein M×N+1 shades of each picture sub-element are realized by causing the ON/OFF duty cycle of said least significant input terminal of each picture sub-element to have a value within the set {0, 1/M×N, 2/M×N, M×N/M×N}, wherein the ON/OFF duty cycle of said least significant input terminal of each picture sub-element during each of said M N-frame sub-sequences of said M×N frame sequence is caused to have a value within the set {0, 1/N, 2/N, . . . , N/N}.

Claim 23

The apparatus of claim 16 further comprising: means for allowing the duty cycle of said least significant input terminal of each picture sub-element during each of said M N-frame sub-sequences of said M×N frame sequence to assume one of two adjacent values only within the set {0, 1/N, 2/N, . . . , N/N}.

Claim 24

The apparatus of claim 16 further comprising: means for allowing the duty cycle of said least significant input terminal of each picture sub-element during at least one, but not all, of said M N-frame sub-sequences of said M×N frame sequence to assume only a first of two adjacent values within the set {0, 1/N, 2/N, . . . , N/N} and means for allowing the duty cycle of said least significant input terminal of each picture sub-element during the other of said M N-frame sub-sequences of said M×N frame sequence to assume only a second of said two adjacent values.

Claim 25

A color display apparatus having an array of picture elements each including plural picture sub-elements each of a different color and each having only two display states, an ON state and an OFF state, comprising: modulating means for modulating an ON/OFF duty cycle of each picture sub-element of the array of picture elements during a multi-frame display sequence according to attribute information of respective picture element data to be displayed; and coordinating means for coordinating the timing of ON/OFF and OFF/ON state transitions of picture sub-elements within each of a plurality of predetermined display neighborhoods throughout the array of picture elements such that the state transitions occur substantially uniformly in space and time, within each display neighborhood, during the multi-frame display sequence whereby said color display apparatus simulates display colors in addition to a number of display colors otherwise available using said color display apparatus wherein said multi-frame sequence is sixty-four frames long and is logically divided into four sub-sequences each sixteen frames long, wherein sixty-five display shades of each picture sub-element are realized by causing the ON/OFF duty cycle of each picture element to have a value within the set {0, 1/64, 2/64, . . . , 64/64}, and wherein the ON/OFF duty cycle of each picture sub-element during each of said four sixteen-frame sub-sequences of said sixty-four-frame sequence is caused to have a value within the set {0, 1/16, 2/16, . . . , 16/16}.

Claim 26

A color display apparatus having an array of picture elements each including plural picture sub-elements each of a different color and each having only two display states, an ON state and an OFF state, comprising: modulating means for modulating an ON/OFF duty cycle of each picture sub-element of the array of picture elements during a multi-frame display sequence according to attribute information of respective picture element data to be displayed; and coordinating means for coordinating the timing of ON/OFF and OFF/ON state transitions of picture sub-elements within each of a plurality of predetermined display neighborhoods throughout the array of picture elements such that the state transitions occur substantially uniformly in space and time, within each display neighborhood, during the multi-frame display sequence whereby said color display apparatus simulates display colors in addition to a number of display colors otherwise available using said color display apparatus wherein said multi-frame sequence is sixty-four frames long and is logically divided into four sub-sequences each sixteen frames long, wherein sixty-five display shades of each picture sub-element are realized by causing the ON/OFF duty cycle of each picture element to have a value within the set {0, 1/64, 2/64, . . . , 64/64}, and wherein the ON/OFF duty cycle of each picture sub-element during each of said four sixteen-frame sub-sequences of said sixty-four-frame sequence is caused to have a value within the set {0, 1/16, 2/16, . . . , 16/16}.

Claim 27

The apparatus of claim 19 further comprising: means for allowing the duty cycle of each picture sub-element during each of said four sixteen-frame sub-sequences of said sixty-four-frame sequence to assume one of two adjacent values only, within the set {0, 1/16, 2/16, . . . , 16/16}.

Claim 28

The apparatus of claim 19 further comprising: means for allowing the duty cycle of each picture sub-element during at least one, but not all, of said four sixteen-frame sub-sequences of said sixty-four-frame sequence to assume only a first of two adjacent values within the set {0, 1/16, 2/16, . . . , 16/16} and means for allowing the duty cycle of each picture sub-element during the other of said four sixteen-frame sub-sequences of said sixty-four-frame sequence to assume a second of said two adjacent values.

Claim 29

A color display apparatus having an array of picture elements each including plural picture sub-elements each of a different color and each having only two display states, an ON state and an OFF state, comprising: modulating means for modulating an ON/OFF duty cycle of each picture sub-element of the array of picture elements during a multi-frame display sequence according to attribute information of respective picture element data to be displayed; and coordinating means for coordinating the timing of ON/OFF and OFF/ON state transitions of picture sub-elements within each of a plurality of predetermined display neighborhoods throughout the array of picture elements such that the state transitions occur substantially uniformly in space and time, within each display neighborhood, during the multi-frame display sequence whereby said color display apparatus simulates display colors in addition to a number of display colors otherwise available using said color display apparatus wherein said multi-frame sequence is M×N frames long, M and N being integers, and is logically divided into M sub-sequences each N frames long, wherein M×N+1 display shades of each picture sub-element are realized by causing the ON/OFF duty cycle of each picture sub-element to have a value within the set {0, 1/M×N, 2/M×N, . . . , M×N/M×n}, and wherein the ON/OFF duty cycle of each picture sub-element during each of said M N-frame sub-sequences of said M×N frame sequence is caused to-have a value within the set {0, 1/N, 2/N, . . . , N/N}.

Claim 30

A color display apparatus having an array of picture elements each including plural picture sub-elements each of a different color and each having only two display states, an ON state and an OFF state, comprising: modulating means for modulating an ON/OFF duty cycle of each picture sub-element of the array of picture elements during a multi-frame display sequence according to attribute information of respective picture element data to be displayed; and coordinating means for coordinating the timing of ON/OFF and OFF/ON state transitions of picture sub-elements within each of a plurality of predetermined display neighborhoods throughout the array of picture elements such that the state transitions occur substantially uniformly in space and time, within each display neighborhood, during the multi-frame display sequence whereby said color display apparatus simulates display colors in addition to a number of display colors otherwise available using said color display apparatus wherein said multi-frame sequence is M×N frames long, M and N being integers, and is logically divided into M sub-sequences each N frames long, wherein M×N+1 display shades of each picture sub-element are realized by causing the ON/OFF duty cycle of each picture sub-element to have a value within the set {0, 1/M×N, 2/M×N, . . . , M×N/M×n}, and wherein the ON/OFF duty cycle of each picture sub-element during each of said M N-frame sub-sequences of said M×N frame sequence is caused to-have a value within the set {0, 1/N, 2/N, . . . , N/N}.

Claim 31

The apparatus of claim 22, further comprising: means for allowing the duty cycle of each picture sub-element during each of said M N-frame subsequences of said M×N frame sequence to assume one of two adjacent values only, within the set {0, 1/M, 2/M . . . M/M}.

Claim 32

The apparatus of claim 22, further comprising: means for allowing the duty cycle of each picture sub-element during each of said M N-frame sub-sequences of said M×N frame sequence to assume only a first of two adjacent values within the set {0, 1/M, 2/M . . . M/M} and means for allowing the duty cycle of each picture sub-element during a second of said M N-frame sub-sequences of said M×N frame sequence to assume only a second of said two adjacent values.