Patent ID: 8564418

Claim:
A remote controller removably mountable in a remote control holder of an onboard display having a power supply circuit, said remote controller comprising: a light emitting element that illuminates a button of the remote controller, the light emitting element being supplied with power from the power supply circuit during a mounted state where the remote controller is mounted in the remote control holder; an internal power supply that supplies power to the light emitting element during a removed state where the remote controller is removed from the remote control holder; and a control unit that detects whether the remote controller is in the mounted state or the removed state, the control unit switching a luminance control method of the light emitting element in accordance with the state detected, wherein the control unit: when the remote controller is in the mounted state, performs luminance control by pulse width modulation in conjunction with a rheostat signal of a vehicle by receiving power supply from the power supply circuit of the onboard display; and when the remote controller is in the removed state, supplies power from the internal power supply to the light emitting element, and performs luminance control by pulse width modulation with a predetermined duty ratio at a fixed voltage.