METHOD AND DEVICE FOR TESTING LIGHT-EMITTING DIODE DIE
First Claim
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1. A testing device for testing a light-emitting diode (LED) die, the testing device comprising:
- a power supply for supplying an electric current to cross the LED die to make the LED die emit light;
a spectrum analyzer configured to detect the wavelength of the light emitted by the LED die; and
a processor in communication with the power supply and the spectrum analyzer, the processor comprising;
a storage unit storing a plurality of standard ranges of wavelengths of lights emitted by a qualified LED die, each of the standard ranges corresponding to an output power level of the power supply;
a user interface configured for receiving user inputs, thus to determine control parameters of the power supply;
a control unit configured for receiving the control parameters and controlling the power supply to output a certain level of electric current across the LED die to make the LED die emit light under the control parameters, the control unit also controlling the spectrum analyzer to detect the wavelength of the light emitted by the LED die and detected by the spectrum analyzer; and
an analyzer unit configured for analyzing whether or not electro-optical properties of the LED die achieve the required and predetermined electro-optical properties, according to a power value supplied by the power supply to the LED die, and the wavelength of the light emitted by the LED die.
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Abstract
A method for testing an LED die includes the following steps: setting control parameters; driving the LED die to emit light by applying an electric current to the LED die under the control parameters; detecting the wavelength of the light emitted by the LED die; and determining whether the LED die meets the predetermined electro-optical properties, based upon the relationship between the control parameters and the wavelength.
4 Citations
8 Claims
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1. A testing device for testing a light-emitting diode (LED) die, the testing device comprising:
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a power supply for supplying an electric current to cross the LED die to make the LED die emit light; a spectrum analyzer configured to detect the wavelength of the light emitted by the LED die; and a processor in communication with the power supply and the spectrum analyzer, the processor comprising; a storage unit storing a plurality of standard ranges of wavelengths of lights emitted by a qualified LED die, each of the standard ranges corresponding to an output power level of the power supply; a user interface configured for receiving user inputs, thus to determine control parameters of the power supply; a control unit configured for receiving the control parameters and controlling the power supply to output a certain level of electric current across the LED die to make the LED die emit light under the control parameters, the control unit also controlling the spectrum analyzer to detect the wavelength of the light emitted by the LED die and detected by the spectrum analyzer; and an analyzer unit configured for analyzing whether or not electro-optical properties of the LED die achieve the required and predetermined electro-optical properties, according to a power value supplied by the power supply to the LED die, and the wavelength of the light emitted by the LED die. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for testing an LED die, the method comprising:
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setting control parameters; driving the LED die to emit light by applying an electric current to the LED die under the control parameters; detecting the wavelength of the light emitted by the LED die; and determining whether the LED die meets the predetermined electro-optical properties, based upon a relationship between the control parameters and the wavelength of the light. - View Dependent Claims (8)
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Specification