Patent ID: 7858409

Claim:
A method for forming a liquid crystal display (LCD) system using light emitting diodes (LED) that emit white light, the method comprising: determining attenuation versus blue light wavelength characteristics of at least LCD layers used to form a color display system, wherein shorter blue wavelength light is attenuated differently than longer blue wavelength light by the LCD layers within a range of visible wavelengths; measuring dominant or peak wavelengths of blue LED dies; providing phosphor layers over the blue LED dies, the phosphor layers allowing blue light emitted from the blue LED dies to leak through the phosphor layers, wherein an amount of blue light leakage through a phosphor layer is controlled by adjusting characteristics of the phosphor layers, wherein an amount of blue light leakage through a phosphor layer over a blue LED die corresponds to a dominant or peak wavelength of the blue LED die, and wherein the phosphor layer for a first blue LED die having a first dominant or peak wavelength is tailored to allow more blue light to leak through compared to a phosphor layer for a second blue LED die having a substantially different dominant or peak wavelength in order to at least partially offset the attenuation versus blue light wavelength characteristics of the LCD layers; wherein light emitted by a combination of blue light leaking through a phosphor layer and light generated by the phosphor layer is white light having a white point at least partially depending on an amount of blue light leaked through the phosphor layer, blue LED dies having associated phosphor layers being white light LEDs; and providing at least one of the white light LEDs as a light source for a backlight to illuminate the LCD layers.