Method and apparatus for dynamic range extender

An LED display system, comprising:

• an array of LEDs;
• a driver circuit configured to drive the array of LEDs, wherein the driver circuit comprises a PWM engine, an adder, an accumulator, a multiplier, and a frame buffer,
• wherein, during operation,
• the multiplier multiplies an image data of a first bit depth (PWM) with a multiple (M) to produce an input data (PWM_M) having a second bit depth, wherein the multiple has an integer section (MI) of one or more bit in length and a fraction section (MF) of one or more bit in length, wherein the input data has an integer section (PWM_MI) and a fraction section (PWM_MF);
• the adder adds a value of PWM_MF of a current input data with a value of a remainder in an accumulator, and
• when a sum of the addition operation is less than one, updating the remainder to equal the sum of the addition;
• when the sum of the addition equals to or is larger than integer one, subtracting integer one from the sum of the addition and updating the remainder to equal a result of the subtraction, and adding integer one to a bit in PWM_MI, and sending the resulting PWM_MI to the frame buffer, and
• the PWM engine receives PMW data from the frame buffer and generates PWM pulses to drive the LED array.