A liquid crystal display (LCD) includes an LCD panel, a circuit module, a driving module, and a signal transmitting module. The circuit module outputs electrical driving signals. The driving module is connected to the LCD panel and drives the LCD panel to display images according to the driving signals. The signal transmitting module includes a laser emitter, an optical waveguide, and a laser receiver. The laser emitter is connected between the circuit module and the optical waveguide and converts the electrical driving signals to optical signals. The laser receiver is connected between the optical waveguide and the driving module and recovers and reconverts the optical signals into driving signals.