Patent ID: 8253675

Claim:
A display apparatus including a wireless communication device, comprising: a display unit that receives a main clock and is operated by an operating frequency in response to the frequency of the main clock; and a main-clock-providing unit that measures noise in signals received from a wireless communication channel, and changes the frequency of the main clock to reduce the noise, wherein the main-clock-providing unit comprises: a wireless communication unit that receives signals from the wireless communication channel; a noise-measuring unit that measures noise from the received signals; a data processor that compares the measured noise with a reference value, determines whether the measured noise is allowable, and as a determination result, supplies a frequency change signal to the graphics controller; and a graphics controller that supplies a main clock in response to the frequency change signal, wherein the noise-measuring unit measures noise by analyzing a signal received at a first operating frequency and a signal received at a second operating frequency, and defining as a noise peak one of two peaks appearing at the first operating frequency and the second operating frequency whose position is shifted, and analyzes the noise peak.