Digital LED desk lamp with automatic uniform illumination area by using two accelerometers and halftone method

In this paper, we design a digital LED desk lamp that can adjust the LEDs brightness in the LED array to obtain the uniform illuminated area whenever the user rotates the lamp shade. The system contains three parts: the LED light source, the tilted measurement unit and the control unit. When the user adjusts the position of the lamp shade the system can change the halftone pattern by using the angle difference from the measurement of the two accelerometers to produce a uniform illuminated area.