Patent ID: 8773158

Claim:
An inspection method, applied to inspect a die quality of at least one light-emitting device, comprising: applying a voltage on the at least one light-emitting device at a first temperature; measuring a first current of the at least one light-emitting device under the applied voltage at the first temperature; heating the at least one light-emitting device from the first temperature to a second temperature; applying a voltage on the at least one light-emitting device at the second temperature; measuring a second current of the at least one light-emitting device under the applied voltage at the second temperature, wherein the voltage comprises a forward voltage or a reverse voltage, such that when the voltage is the forward voltage, the first current and the second current are forward currents, and when the votage is the reverse voltage, the first current and the second current are reverse currents; and determining whether a difference between the second current and the first current is larger than a failure current determination value, wherein if the difference between the second current and the first current is larger than the failure current determination value, the at least one light-emitting device is determined to be a failed device.