Boost circuits, LED backlight driving circuits and liquid crystal devices

A LED backlight driving circuit, comprising:

• a boost circuit and at least one LED loading, the boost circuit comprises:
• an inductor (L), a MOS transistor (Q), and a number “n” of switch components (Q1-Qn), a first end of the inductor (L) receives an input voltage (Vin), and a second end of the inductor (L) connects to a drain of the MOS transistor (Q), a source of the MOS transistor (Q) is electrically grounded, a gate of the MOS transistor (Q) is driven by one square-wave signals (S), the first ends of the number “n” of switch components (Q1-Qn) respectively connects to the second end of the inductor (L), the second ends of the number “n” of switch components (1-Qn) respectively outputs a number “n” of output voltages (Vo1-Von), the number “n” of switch components (Q1-Qn) are driven by a number “n” of square-wave signals (S1-Sn), one of the number “n” of output voltages (Vo1-Von) supplies a driving voltage to the LED loading, and other output voltages supply the driving voltages to other loadings of the LED backlight driving circuit;
• wherein a duty ratio of the square-wave signals (S) is d, the duty ratios of the square-wave signals (S1-Sn) are d1-dn, before a turn-off time of each period of the MOS transistor (Q), the number “n” of square-wave signals (S1-Sn) are driven by a number “n” of switch components (Q1-Qn) in turn, and d1+d2+d3+ . . . +dn=1−d;
• and
• wherein n is an integer greater than one.

A liquid crystal device, comprising:

• a liquid crystal panel and a backlight module for providing a display light source to the liquid crystal panel such that the liquid crystal panel is capable of displaying images;
• the backlight module comprises a LED backlight source, a driving circuit of the LED backlight source comprises a boost circuit and at least one LED loading, the boost circuit comprises:
• an inductor (L), a MOS transistor (Q), and a number “n” of switch components (Q1-Qn), a first end of the inductor (L) receives an input voltage (Vin), and a second end of the inductor (L) connects to a drain of the MOS transistor (Q), a source of the MOS transistor (Q) is electrically grounded, a gate of the MOS transistor (Q) is driven by one square-wave signals (S), the first ends of the number “n” of switch components (Q1-Qn) respectively connects to the second end of the inductor (L), the second ends of the number “n” of switch components (Q1-Qn) respectively outputs a number “n” of output voltages (Vo1-Von), the number “n” of switch components (Q1-Qn) are driven by a number “n” of square-wave signals (S1-Sn), one of the number “n” of output voltages (Vo1-Von) supplies a driving voltage to the LED loading, and other output voltages supply the driving voltages to other loadings of the LED backlight driving circuit;
• wherein a duty ratio of the square-wave signals (S) is d, the duty ratios of the square-wave signals (S1-Sn) are d1-dn, before a turn-off time of each period of the MOS transistor (Q), the number “n” of square-wave signals (S1-Sn) are driven by a number “n” of switch components (Q1-Qn) in turn, and d1+d2+d3+ . . . +dn=1−d;
• and
• wherein n is an integer greater than one.