Patent ID: 6819056
Filing Date: 2004-11-16
Classification: F21K,F21V,F21Y,H05B,Y02B,Y10S

Abstract:
A color-changing bulb for an instrument panel of a vehicle, which is installable in a bulb seat of the instrument panel, the color-changing bulb comprising:a bulb housing having a transparent cover on upper side and defining a receiving space, a lower side of the housing being connected with a conductive seat, the bulb housing being mountable in the bulb seat with the conductive seat electrically connected with a power supply in the bulb seat; a light emitting diode including multicolor light emitting chips and positioned in the receiving space of the bulb housing; and, a circuit board positioned in the receiving space of the bulb housing, a controlling circuit being disposed on the circuit board and connected with the light emitting diode for driving the multicolor light emitting chips of the light emitting diode to create multiple combinations of colors of light; wherein the controlling circuit on the circuit board is connected to a brightness adjuster, the controlling circuit including: a voltage sampling unit for picking up the varied voltage value adjusted by the brightness adjuster; and an analog/digital converting unit having an analog input terminal connected with the voltage sampling unit and having multiple output terminals respectively connected with the multicolor light emitting chips of the light emitting diode, the analog/digital converting unit serving to convert the varied voltage value adjusted by the brightness adjuster into multi-bit digital signal for actuating the multicolor light emitting chips to create multiple combinations of colors of light.