LED backlight module and backlight driving circuit

A backlight driving circuit of a LED backlight module, said LED backlight module comprising a heat-dissipating plate and a first LED string, said backlight driving circuit generating a first positive driving voltage and a first negative driving voltage to drive illumination of said first LED string, said backlight driving circuit comprising:

• a first positive output terminal electrically connected with a first positive driving terminal of said first LED string;
• a first negative output terminal electrically connected with a first negative driving terminal of said first LED string;
• and
• a zero voltage terminal electrically connected with said heat-dissipating plate,
• wherein said first positive driving voltage and said first negative driving voltage are respectively transmitted to said first positive driving terminal and said first negative output terminal of said first LED string, wherein a voltage difference between said first positive driving terminal and said heat-dissipating plate is equal to said first positive driving voltage, and a voltage difference between said first negative driving terminal and said heat-dissipating plate is equal to said first negative driving voltage;
• wherein said first LED string comprises plural LEDs, which are serially-connected between said first positive driving terminal and said first negative driving terminal, a first connecting terminal is arranged between said first positive driving terminal and said first negative driving terminal of said first LED string, a first number of LEDs of said first LED string are electrically connected between said first connecting terminal and said first positive driving terminal, and a second number of LEDs of said first LED string are electrically connected between said first connecting terminal and said first negative driving terminal.

A LED backlight module, comprising:

• a substrate;
• a heat-dissipating plate disposed on a first surface of said substrate for dissipating heat;
• a first LED string disposed on a second surface of said substrate for emitting light, wherein said first LED string comprises plural LEDs electrically connected with each other in series, and said first LED string further comprises a first positive driving terminal, a first negative driving terminal and a first connecting terminal, said connecting terminal is arranged between said first positive driving terminal and said first negative driving terminal of said first LED string, and said first connecting terminal is electrically connected with said heat-dissipating plate;
• and
• a backlight driving circuit comprising a first positive output terminal and a first negative output terminal, wherein said first positive output terminal and said first negative output terminal are respectively connected with said first positive driving terminal and said first negative driving terminal, so that a first positive driving voltage and a first negative driving voltage are generated by said backlight driving circuit to drive illumination of said first LED string,
• wherein a first number of LEDs of said first LED string are electrically connected between said first connecting terminal and said first positive driving terminal, and a second number of LEDs of said first LED string are electrically connected between said first connecting terminal and said first negative driving terminal.