Presentation of highly saturated colors with high luminance

摘要

A method is applicable to a pixel of a graphical display that is formed by LEDs or LED strings, with the colors that can be displayed by the pixel (i.e., the color gamut) defined by an LED drive specification matrix A. The method displays a desired color at a chromaticity coordinates (xn, yn) and a luminous intensity Y by carrying out: (a) finding a maximum luminous intensity Ŷ and the associated LED drive vector {circumflex over (b)} for each of a collection of sample colors in the color gamut using a mathematical programming technique; and (b) calculating the LED drive vector for the desired color; and (c) displaying the color on the pixel using the calculated drive vector. In one implementation, the calculated LED drive vector is scaled using the expression;b^⁢min(YY^,1).
(b) based on we sample colors. In addition, the method may create an interpolation function ƒ(x, y) for luminous intensity Ŷ and LED drive vector {circumflex over (b)} for colors outside of the sample colors. The interpolation function is used to evaluate ƒ(xn, yn) to obtain luminous intensity Ŷ and LED drive vector {circumflex over (b)} for the desired color. The interpolation function may be created off-line, and calculating the LED drive may be carried out in real time.

主权项

1. A method for displaying a desired color at chromaticity coordinates and a desired luminous intensity on a pixel formed by a plurality of LEDs or LED strings, the pixel being capable of displaying colors defined by a color gamut, the method comprising:
finding a maximum luminous intensity and an associated LED drive vector for each of a selected set of colors in the color gamut using a mathematical programming technique subject to one or more constraints, wherein one of the constraints constrains a function of each of the associated LED drive vectors to be less than or equal to a predetermined value; calculating the LED drive vector for the desired color at the desired luminous intensity based on the maximum luminous intensities and the associated LED drive vectors for the selected set of colors; and using the LED drive vector for the desired color to drive the plurality of LEDs or LED strings so as to display the desired color on the pixel.