Display device compensating for color irregurality between pixels

Claim 2

A display device comprising: a screen defined by a matrix of pixels on which an image represented by an image input signal is to be displayed; first light-emitting elements, one for each of the pixels, each of said first light-emitting elements being actuated to produce light of a first color in a corresponding one of the pixels; second light-emitting elements, one for each of the pixels, each of said second light-emitting elements being actuated to produce light of a second color different from the first color in a corresponding one of the pixels; and a light-emitting element controlling circuit responsive to the image input signal to control actuation of each of said first and second light-emitting elements to form the image on said screen, said light-emitting element controlling circuit actuating said second light-emitting element in each of the pixels to visually mix the light of the second color with the light of the first color produced by a corresponding one of said first light-emitting elements in a given proportion to minimize a difference in chromaticity of the lights of the first color between the pixels.

Claim 3

A display device as set forth in claim 1 , wherein said light-emitting element controlling circuit also actuates said first light-emitting element in each of the pixels to visually mix the light of the first color with the light of the second color produced by a corresponding one of said second light-emitting elements in a given proportion to minimize the difference in chromaticity of the lights of the second color between the pixels.

Claim 4

A display device as set forth in claim 1 , further comprising third light-emitting elements, one for each of the pixels, each of said third light-emitting elements being actuated to produce light of a third color different from the first and second colors, and wherein said light-emitting element controlling circuit actuates said second light-emitting element and said third light-emitting element in each of the pixels in a given luminance proportion to minimize a shift in chromaticity of the light of the first color produced by a corresponding one of the first light-emitting elements from a reference one.

Claim 5

A display device as set forth in claim 3 , wherein each of the first color, the second color, and the third color is one of red, green, and blue.

Claim 6

A display device as set forth in claim 3 , wherein each of said first, second, and third light-emitting elements is implemented by a light-emitting diode.

Claim 7

A display device as set forth in claim 1 , wherein said light-emitting element controlling circuit is responsive to the image input signal to produce reference pulse signals each for actuation of one of the first light-emitting elements for producing the light of the first color at a given luminance specified by the image input signal, each of the reference pulse signals having a width specifying a duration of emission of the light from a corresponding one of the first light-emitting elements and a height that is a function of a value of current for excitation of the one of the first light-emitting elements, said light-emitting element controlling circuit storing therein correction factors each required to substantially compensate for a shift in chromaticity of the light emitted from one of first light-emitting elements from a reference one and producing correction pulse signals based on the correction factors each of which is applied to a corresponding one of said second light-emitting elements to produce the light of the second color, thereby minimizing the difference in chromaticity of the lights of the first color between the pixels.

Claim 8

A display device as set forth in claim 6 , wherein said light-emitting element controlling circuit produces the correction pulse signals each of which has a width substantially identical with the width of a corresponding one of the reference pulse signals and a height determined based on a corresponding one of the correction factors as a function of the shift in chromaticity of the light from the reference one.

Claim 9

A display device as set forth in claim 6 , wherein said light-emitting element controlling circuit produces the correction pulse signals each of which has a height substantially identical with the height of a corresponding one of the reference pulse signals and a width determined based on a corresponding one of the correction factors as a function of the shift in chromaticity of the light from the reference one.

Claim 10

A display device as set forth in claim 6 , wherein said light-emitting element controlling circuit outputs each of the correction pulse signals in a given time sequential relation to output of a corresponding one of the reference pulse signals.

Claim 11

A display device as set forth in claim 6 , wherein said light-emitting element controlling circuit corrects each of the reference pulse signals so as to substantially eliminate a difference between a luminance of the light emitted from a corresponding one of the first light-emitting elements and a target one.

Claim 12

A display device as set forth in claim 3 , wherein said light-emitting element controlling circuit is responsive to the image input signal to produce reference pulse signals each for actuation of one of the first light-emitting elements for producing the light of the first color at a given luminance specified by the image input signal, each of the reference pulse signals having a width specifying a duration of emission of the light from a corresponding one of the first light-emitting elements and a height that is a function of a value of current for excitation of the one of the first light-emitting elements, said light-emitting element controlling circuit storing therein correction factors required to substantially compensate for a shift in chromaticity of the light emitted from each of first light-emitting elements from a reference one and producing correction pulse signals based on the correction factors which are applied to said second and third light-emitting elements in a corresponding one of the pixels to produce the lights of the second and third colors, thereby visually shifting the light of the first color to the second and third colors to minimize the difference in chromaticity of the lights of the first color between the pixels.

Claim 13

A display device as set forth in claim 11 , wherein said light-emitting element controlling circuit corrects each of the reference pulse signals so as to substantially eliminate a difference between a luminance of the light emitted from a corresponding one of the first light-emitting elements and a target one.