White LED for backlight with phosphor plates

A method of forming a light emitting device comprising:

• testing LED dies that emit light with a peak wavelength less than approximately 480 nm and determining light emission characteristics of the LED dies;
• binning the LED dies in accordance with their light emission characteristics;
• forming a variety of plates of a phosphor that emit at least orange-red or red light with a peak wavelength larger than 590 nm when energized by light from the LED dies, the plates being formed separate from the LED dies, the plates having different characteristics associated with different bins of LED dies;
• matching a plate having a particular characteristic to a binned LED die to generate a white light having a target white point;
• and
• affixing a matched plate over an LED die to form a white light LED emitting orange-red or red, green or yellow-green, and blue light components, wherein a combination of the orange-red or red, green or yellow-green, and blue light components produces white light having the target white point,
• wherein forming a variety of plates of a phosphor that emit at least orange-red or red light with a peak wavelength larger than 590 nm when energized by light from the LED dies comprises forming a variety of plates of a phosphor that emit at least orange-red or red light and green or yellow-green light when energized by light from the LED dies.

A method of forming a light emitting device comprising:

• testing LED dies that emit light with a peak wavelength less than approximately 480 nm and determining light emission characteristics of the LED dies;
• binning the LED dies in accordance with their light emission characteristics;
• forming a variety of plates of a phosphor that emit at least orange-red or red light with a peak wavelength larger than 590 nm when energized by light from the LED dies, the plates being formed separate from the LED dies, the plates having different characteristics associated with different bins of LED dies;
• matching a plate having a particular characteristic to a binned LED die to generate a white light having a target white point;
• and
• affixing a matched plate over an LED die to form a white light LED emitting orange-red or red, green or yellow-green, and blue light components, wherein a combination of the orange-red or red, green or yellow-green, and blue light components produces white light having the target white point,
• wherein the matched plate is affixed to the LED die by an adhesive, and wherein the adhesive includes one of silicone and glass.

A method of forming a light emitting device comprising:

• testing LED dies that emit light with a peak wavelength less than approximately 480 nm and determining light emission characteristics of the LED dies;
• binning the LED dies in accordance with their light emission characteristics;
• forming a variety of plates of a phosphor that emit at least orange-red or red light with a peak wavelength larger than 590 nm when energized by light from the LED dies, the plates being formed separate from the LED dies, the plates having different characteristics associated with different bins of LED dies;
• matching a plate having a particular characteristic to a binned LED die to generate a white light having a target white point;
• and
• affixing a matched plate over an LED die to form a white light LED emitting orange-red or red, green or yellow-green, and blue light components, wherein a combination of the orange-red or red, green or yellow-green, and blue light components produces white light having the target white point,
• wherein forming the variety of plates of a phosphor that emit at least orange-red or red light comprises sintering phosphor grains under heat and pressure.

A method of forming a light emitting device comprising:

• testing LED dies that emit light with a peak wavelength less than approximately 480 nm and determining light emission characteristics of the LED dies;
• binning the LED dies in accordance with their light emission characteristics;
• forming a variety of plates of a phosphor that emit at least orange-red or red light with a peak wavelength larger than 590 nm when energized by light from the LED dies, the plates being formed separate from the LED dies, the plates having different characteristics associated with different bins of LED dies;
• matching a plate having a particular characteristic to a binned LED die to generate a white light having a target white point;
• affixing a matched plate over an LED die to form a white light LED emitting orange-red or red, green or yellow-green, and blue light components, wherein a combination of the orange-red or red, green or yellow-green, and blue light components produces white light having the target white point;
• providing the white light LED, along with a plurality of other white light LEDs substantially identical to the white light LED, in a backlight for a liquid crystal display (LCD),
• operating the LCD to create images from red, green, and blue pixels;
• and
• modulating a brightness of white light LEDs in the backlight such that a light output of some white light LEDs in the backlight box is different from a light output of other white light LEDs in the backlight.