Abstract: A backlight driving circuit is disclosed. The backlight driving circuit includes a steady voltage circuit, a boost converter, a current setting circuit, and a control circuit. The steady voltage circuit receives an input voltage, filters the input voltage and outputs a steady DC voltage. The boost converter connects to the steady voltage circuit to receive the steady DC voltage. The control circuit provides a first PWM square wave such that the boost converter may supply power to the LED light bar. Wherein the boost converter includes a first MOSFET or a triode. At least three parallel connected resistors are arranged between a source of the first MOSFET or a collector of the triode and the ground, and the three resistors have the same or similar resistance. In addition, a liquid crystal display includes the backlight driving circuit is also disclosed.

Abstract: An LED drive circuit includes: a rectifier circuit that outputs a full-wave rectification waveform voltage; a primary LED row that includes a first partial LED row and a second partial LED row; an auxiliary LED row; a bypass circuit that is connected to part connecting the first partial LED row and the second partial LED row and that returns current from the first partial LED row to the rectifier circuit; and a current limiting circuit that limits the current flowing through the auxiliary LED row wherein the primary LED row and the auxiliary LED row are connected in parallel to the rectifier circuit; and the bypass circuit blocks the current passing through the bypass circuit in accordance with the current flowing through the primary LED row, and controls and blocks the current flowing through the auxiliary LED row.

Abstract: A radio antenna is designed for use on a circuit board having a slot. The antenna is shaped such that one radiator segment is located in the slot while the other segment is located outside the slot. As such, the total thickness of the circuit board and the disposed antenna can be reduced. The antenna can be a chip antenna having a support block for disposing the radiator segments on opposite sides of the support block. The support block can have steps so that one or more different radiator segments can be disposed on the step surfaces, and the circuit board has a plurality of electrically conductive strips separately connected to the radiator segments on the step surfaces to provide grounding and feed to the antenna.