A pixel circuit and an organic light-emitting diode display using the pixel circuit is provided. Coupling device are provided which connect each variable frequency oscillator to said resonant structure. The double hard mask may be formed at temperatures below 400 C. The method includes identifying at least one carrier that is preferable for the second base station to utilize for communications with at least one UE to avoid interference. A plurality of light-emitting diodes are installed inside the base block and positioned directly below respective clipping holes.