To address the problem of low precision of the traditional inter-symbol dimming control methods in visible light communication (VLC), an efficient adaptively biased layered optical orthogonal frequency division multiplexing (ABLO-OFDM) method compatible with high-precision dimming is proposed in the paper. By introducing a hybrid pulse width modulation (PWM) signal based on both inter-symbol and intra-symbol intervals, dimming level with high precision is achieved in the proposed method. Furthermore, the signal transmission and signal detection at the receiver are immune to the dimming control, thanks to the well-designed pre-processing operation at the transmitter. Therefore, a standard OFDM receiver can be directly used for signal detection in the proposed scheme, which significantly reduces the receiver complexity and processing delay. Simulation results demonstrate that the proposed scheme achieves higher dimming precision as well as better transmission performance compared to the traditional ones.