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US 7,889,161 B2Granted
Light emitting apparatus, method for driving the light emitting apparatus, and display apparatus including the light emitting apparatus
AssigneeSharp Kabushiki Kaisha
InventorsTakeshi Kamikawa, Shigetoshi Ito, Mototaka Taneya
Life of this patent
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Abstract
A light emitting apparatus comprises a light emitting section for emitting light, a color of the light being changed with a value of a driving current, and a driving section for driving the light emitting section so that the light emitting section emits light having a desired color and a desired intensity, by generating the driving current based on a signal designating the desired color and a signal designating the desired intensity and by applying the driving current to the light emitting section.
Claims18
An apparatus for driving a light emitting display apparatus, comprising:
- a plurality of the light emitting apparatuses, each including a light emitting section for emitting light, the light emitting section being an LED device which includes an InGaN quantum well layer as an active layer, a color of the light of the LED device being blue shifted with a change in value of a driving current;
- means for supplying a pulse current to the light emitting apparatus to drive the light emitting apparatus, and
- means for controlling separately the peak value and the duty ratio of the pulse current;
- wherein the pulse current has a period equal to or less than 30 ms and a pulse width equal to or larger than 0.2 ns.
1 more element
An apparatus for driving a light emitting display apparatus, comprising:
- a plurality of the light emitting apparatuses, each including a light emitting section for emitting light, the light emitting section including an LED device and a fluorescent excited by light emitted by the LED device, a color of the light of the LED device being blue shifted with a change in value of a driving current;
- means for supplying a pulse current to the light emitting apparatus to drive the light emitting apparatus, and
- means for controlling separately the peak value and the duty ratio of the pulse current;
- wherein the pulse current has a period equal to or less than 30 ms and a pulse width equal to or larger than 0.2 ns.
1 more element
An apparatus for driving a light emitting display apparatus comprising:
- a plurality of the light emitting apparatuses, each including a light emitting section for emitting light, the light emitting section including an LED device and a fluorescent excited by light emitted by the LED device, a color of the light of the LED device being blue shifted with a change in value of a driving current;
- means for supplying a pulse current as the driving current to the light emitting apparatus to drive the light emitting apparatus, and
- means for controlling separately the peak value and the duty ratio of the pulse current;
- wherein, if a value of the driving current is changed, the variation of a color of light emitting from the light emitting section is larger than that of a color of light emitting from the LED device.
1 more element
An apparatus for driving a light emitting display apparatus, comprising:
- a plurality of the light emitting apparatuses which are driven by a driving current so as to obtain a color of the light being blue shifted, the light emitting apparatuses including a light emitting section for emitting light, the light emitting section being an LED device which includes an InGaN quantum well layer as an active layer, and a color of the light of the LED device being blue shifted with a change in value of the driving current;
- means for supplying a pulse current to the light emitting apparatus to drive the light emitting apparatus, and
- means for controlling separately the peak value and the duty ratio of the pulse current, whereby the light emitting apparatus emits light having a desired color by changing the peak value of the pulse current, even if the driving current is changed;
- wherein the pulse current has a period equal to or less than 30 ms and a pulse width equal to or larger than 0.2 ns.
1 more element
An apparatus for driving a light emitting display apparatus, comprising:
- a plurality of the light emitting apparatuses which are driven by a driving current so as to obtain a color of the light being blue shifted,
- the light emitting apparatus including a light emitting section for emitting light, the light emitting section including an LED device and a fluorescent excited by light emitted by the LED device, and a color of the light of the LED device being blue shifted with a change in value of the driving current;
- means for supplying a pulse current to the light emitting apparatus to drive the light emitting apparatus, and
- means for controlling separately the peak value and the duty ratio of the pulse current, whereby the light emitting apparatus emits light having a desired color by changing the peak value of the pulse current, even if the driving current is changed;
- wherein the pulse current has a period equal to or less than 30 ms and a pulse width equal to or larger than 0.2 ns.
2 more elements
Dependencies are inferred from the claim text.