An LED driving circuit (100; 200; 300) connectable to a first LED unit (XLED) and configured to control the illumination of said first LED unit (XLED), comprising: a data latch circuit (110; 210; 310), comprising N latch units, wherein each of the plurality of latch units is configured to latch a corresponding bit of a data signal according to a first latch signal and to output the corresponding bit of the data signal as a corresponding bit of a first control signal, the data signal, the first latch signal and the first control signal having N bits, N being a positive integer; a current source (120; 220; 320), configured to generate a constant current; and a PWM circuit (130; 230; 400), comprising: a plurality N of transmission transistors (410, 420,..., 440), wherein each of the transmission transistors has a first terminal configured to receive a corresponding bit (BIT_1, BIT 2, BIT_3, BIT 4) of the first control signal, a gate terminal configured to receive a corresponding bit (EN_1, EN_2,... EN_4) of an enable signal and a second terminal; wherein the second terminals of the transmission transistors are all connected together to a common node; wherein the PWM circuit is configured to generate a PWM signal (SPWM) at the common node according to respective duty cycles of the bits (EN_1, EN_2,... EN_4) of the enable signal; and a dimming transistor having a gate terminal connected to the common node, a first terminal connected to the current source and a second terminal connectable to the first LED unit, the dimming transistor being configured to couple the current source to the first LED unit according to the PWM signal so as to control the flow of the constant current through the first LED unit; and a transistor (450; 75) having a first terminal connected to the common node and a second terminal connected to a supply voltage or a ground, said transistor (450; 75) being configured to pull the common node to the supply voltage if the second terminal is connected to the supply voltage or the ground if the second terminal is connected to the ground when all the transmission transistors are turned OFF; wherein the LED driving circuit is implemented by only P-type transistors or by only N-type transistors. a data latch circuit (110; 210; 310), comprising N latch units, wherein each of the plurality of latch units is configured to latch a corresponding bit of a data signal according to a first latch signal and to output the corresponding bit of the data signal as a corresponding bit of a first control signal, the data signal, the first latch signal and the first control signal having N bits, N being a positive integer; a current source (120; 220; 320), configured to generate a constant current; and a PWM circuit (130; 230; 400), comprising: a plurality N of transmission transistors (410, 420,..., 440), wherein each of the transmission transistors has a first terminal configured to receive a corresponding bit (BIT_1, BIT 2, BIT_3, BIT 4) of the first control signal, a gate terminal configured to receive a corresponding bit (EN_1, EN_2,... EN_4) of an enable signal and a second terminal; wherein the second terminals of the transmission transistors are all connected together to a common node; wherein the PWM circuit is configured to generate a PWM signal (SPWM) at the common node according to respective duty cycles of the bits (EN_1, EN_2,... EN_4) of the enable signal; and a dimming transistor having a gate terminal connected to the common node, a first terminal connected to the current source and a second terminal connectable to the first LED unit, the dimming transistor being configured to couple the current source to the first LED unit according to the PWM signal so as to control the flow of the constant current through the first LED unit; and a plurality N of transmission transistors (410, 420,..., 440), wherein each of the transmission transistors has a first terminal configured to receive a corresponding bit (BIT_1, BIT 2, BIT_3, BIT 4) of the first control signal, a gate terminal configured to receive a corresponding bit (EN_1, EN_2,... EN_4) of an enable signal and a second terminal; wherein the second terminals of the transmission transistors are all connected together to a common node; wherein the PWM circuit is configured to generate a PWM signal (SPWM) at the common node according to respective duty cycles of the bits (EN_1, EN_2,... EN_4) of the enable signal; and a dimming transistor having a gate terminal connected to the common node, a first terminal connected to the current source and a second terminal connectable to the first LED unit, the dimming transistor being configured to couple the current source to the first LED unit according to the PWM signal so as to control the flow of the constant current through the first LED unit; and a transistor (450; 75) having a first terminal connected to the common node and a second terminal connected to a supply voltage or a ground, said transistor (450; 75) being configured to pull the common node to the supply voltage if the second terminal is connected to the supply voltage or the ground if the second terminal is connected to the ground when all the transmission transistors are turned OFF; wherein the LED driving circuit is implemented by only P-type transistors or by only N-type transistors.