A liquid crystal panel device, being able to transfer heat generation within each of cells building up a panel, into an outside thereof, effectively, therefore being suitable for use in a liquid crystal projection, etc. The handheld device includes a transceiver, a user interface configured to receive a user response, a unique address identifying the handheld device, and signal generating logic configured to generate a radio frequency signal encoding the user response and the unique address. The interference caused by the original signal is removed by using the encoder knowledge about the original signal and modulating the energy of the embedded mark to compensate for the original signal interference.