Method for driving quad-subpixel display
First Claim
1. A method of displaying an image on a display, comprising:
- receiving a display signal that defines an image, whereina display color gamut is defined by three sets of CIE coordinates (xRI, yRI), (xGI, yGI), (xsI, yBI)the display signal is defined for a plurality of pixels;
for each pixel, the display signal comprises a desired chromaticity and luminance defined by three components RI, GI and BI that correspond to luminances for three sub-pixels having CIE coordinates (xRI, yRII), (xGI, yGI) and (xBI, yBI), respectively, that render the desired chromaticity and luminance;
wherein the display comprises a plurality of pixels, each pixel including an R sub-pixel, a G sub-pixel, a B1 sub-pixel and a B2 sub-pixel, wherein;
each R sub-pixel comprises a first organic light emitting device that emits light having a peak wavelength in the visible spectrum of 580-700 mu, further comprising a first emissive layer having a first emitting material;
each G sub-pixel comprises a second organic light emitting device that emits light having a peak wavelength in the visible spectrum of 500-580 nm, further comprising a second emissive layer having a second emitting material;
each B1 sub-pixel comprises a third organic light emitting device that emits light having a peak wavelength in the visible spectram of 400-500 nm, further comprising a third emissive layer having a third emitting material;
each B2 sub-pixel comprises a fourth organic light emitting device that emits light having a peak wavelength in the visible spectrum of 400 to 500 nm, further comprising a fourth emissive layer having a fourth emitting material;
the third emitting material is different from the fourth emitting material; and
the peak wavelength in the visible spectrum of light emitted by the fourth organic light emitting device is at least 4 nm less than the peak wavelength in the visible spectrum of light emitted by the third organic light emitting device;
wherein each of the R, G, B1 and B2 sub-pixels has CIE coordinates (xR, yR), (xG, yG), (xB1, yB1) and (xB2, yB2), respectively;
wherein each of the R, G, B1 and B2 sub-pixels has a maximum luminance YR, YG, YB1 and YB2, respectively, and a signal component RC, GC B1C and B2C, respectively;
wherein a plurality of color-spaces are defined, each color space being defined by the CIE coordinates of three of the R, G, B1 and B2 sub-pixels,wherein every chromaticity of the display gamut is located within at least one of the plurality of color spaces;
wherein at least one of the color spaces is defined by the R, G and B2 sub-pixels;
wherein the color spaces are calibrated by using a calibration chromaticity and luminance having a CIE coordinate (xC, yC) located in the color space defined by the R, B and B1 sub-pixels, such that;
a single maximum luminance for the display is defined for each of the R, G, B1 and B2 sub-pixels,for each color space, for chromaticities located within the color space, a linear transformation is defined that transforms the three components RI, GI and BI into luminances for the each of the three sub-pixels having CIE coordinates that define the color space that will render the desired chromaticity and luminance defined by the three components R1, G1 and B1;
displaying the image by, for each pixel;
choosing one of the plurality of color spaces that includes the desired chromaticity of the pixel;
transforming the RI, GI and BI components of the signal for the pixel into luminances defined relative to the maximum luminance for the display for each of the three sub-pixels having CIE coordinates that define the chosen color space;
emitting light from the pixel having the desired chromaticity and luminance using the luminances resulting from the transformation of the RI, GI and BI components.
1 Assignment
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Accused Products
Abstract
A device that may be used as a multi-color pixel is provided. The device has a first organic light emitting device, a second organic light emitting device, a third organic light emitting device, and a fourth organic light emitting device. The device may be a pixel of a display having four sub-pixels. The first device may emit red light, the second device may emit green light, the third device may emit light blue light and the fourth device may emit deep blue light. A method of displaying an image on such a display is also provided, where the image signal may be in a format designed for use with a three sub-pixel architecture, and the method involves conversion to a format usable with the four sub-pixel architecture.
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Citations
16 Claims
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1. A method of displaying an image on a display, comprising:
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receiving a display signal that defines an image, wherein a display color gamut is defined by three sets of CIE coordinates (xRI, yRI), (xGI, yGI), (xsI, yBI) the display signal is defined for a plurality of pixels; for each pixel, the display signal comprises a desired chromaticity and luminance defined by three components RI, GI and BI that correspond to luminances for three sub-pixels having CIE coordinates (xRI, yRII), (xGI, yGI) and (xBI, yBI), respectively, that render the desired chromaticity and luminance; wherein the display comprises a plurality of pixels, each pixel including an R sub-pixel, a G sub-pixel, a B1 sub-pixel and a B2 sub-pixel, wherein; each R sub-pixel comprises a first organic light emitting device that emits light having a peak wavelength in the visible spectrum of 580-700 mu, further comprising a first emissive layer having a first emitting material; each G sub-pixel comprises a second organic light emitting device that emits light having a peak wavelength in the visible spectrum of 500-580 nm, further comprising a second emissive layer having a second emitting material; each B1 sub-pixel comprises a third organic light emitting device that emits light having a peak wavelength in the visible spectram of 400-500 nm, further comprising a third emissive layer having a third emitting material; each B2 sub-pixel comprises a fourth organic light emitting device that emits light having a peak wavelength in the visible spectrum of 400 to 500 nm, further comprising a fourth emissive layer having a fourth emitting material; the third emitting material is different from the fourth emitting material; and the peak wavelength in the visible spectrum of light emitted by the fourth organic light emitting device is at least 4 nm less than the peak wavelength in the visible spectrum of light emitted by the third organic light emitting device; wherein each of the R, G, B1 and B2 sub-pixels has CIE coordinates (xR, yR), (xG, yG), (xB1, yB1) and (xB2, yB2), respectively; wherein each of the R, G, B1 and B2 sub-pixels has a maximum luminance YR, YG, YB1 and YB2, respectively, and a signal component RC, GC B1C and B2C, respectively; wherein a plurality of color-spaces are defined, each color space being defined by the CIE coordinates of three of the R, G, B1 and B2 sub-pixels, wherein every chromaticity of the display gamut is located within at least one of the plurality of color spaces; wherein at least one of the color spaces is defined by the R, G and B2 sub-pixels; wherein the color spaces are calibrated by using a calibration chromaticity and luminance having a CIE coordinate (xC, yC) located in the color space defined by the R, B and B1 sub-pixels, such that; a single maximum luminance for the display is defined for each of the R, G, B1 and B2 sub-pixels, for each color space, for chromaticities located within the color space, a linear transformation is defined that transforms the three components RI, GI and BI into luminances for the each of the three sub-pixels having CIE coordinates that define the color space that will render the desired chromaticity and luminance defined by the three components R1, G1 and B1; displaying the image by, for each pixel; choosing one of the plurality of color spaces that includes the desired chromaticity of the pixel; transforming the RI, GI and BI components of the signal for the pixel into luminances defined relative to the maximum luminance for the display for each of the three sub-pixels having CIE coordinates that define the chosen color space; emitting light from the pixel having the desired chromaticity and luminance using the luminances resulting from the transformation of the RI, GI and BI components. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification