Blue filter for display
AssigneeNexdot
InventorsBenoît Dubertret, Guillaume Naudin, Michele D'Amico, Wilfried Solo-Ojo, Yu-Pu Lin
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Abstract
A display that includes an image producing system and a light filtering layer in the blue range, the light filtering layer having a limited impact on the gamut of the display. The image producing system has a gamut G0 defined in a color space The light filtering layer includes semi-conductive nanoparticles, and the absorbance through the light filtering layer is greater than 0.25 for each light wavelength ranging from 350 nm to λcut, λcut being in the range from 420 nm to 450 nm. The gamut G1 of the image producing system with the filtering layer has an area greater than 90% of the area of gamut G0 in the color space.
Claims14
A display comprising:
- a) an image producing system having a gamut G0 defined in a color space;
- b) a light filtering layer comprising semi-conductive nanoparticles;
- wherein an absorbance through said light filtering layer is greater than 0.25 for each light wavelength ranging from 350 nm to a wavelength of transition λcut, λcut being in the range from 420 nm to 450 nm, such that an absorbance curve of the light filtering layer presents three zones:
- a first plateau P1 wherein absorbance is high and is roughly constant to an average absorbance A1, corresponding to a low wavelength area,
- a decreasing zone D wherein absorbance decreases from Al to A2 and A2=A 1/10, a limit between the first plateau P1 and the decreasing zone D corresponds to the wavelength of transition λcut,
- a second plateau P2 wherein absorbance is low and is roughly constant to an average absorbance A2, extending up to red end of visible light;
- wherein a width of the decreasing zone D is less than 40 nm;
- and
- wherein a gamut G1 of said image producing system with said light filtering layer has an area greater than 90% of an area of gamut G0 in said color space.
Dependencies are inferred from the claim text.