Method and system for controlling display condition which is pre-written into passive light board by mobile device

A method for controlling a display condition which is pre-written into a passive light board by a mobile device, comprising the steps of:

• providing at least one passive light board, wherein the passive light board comprises a microcontroller, a communication unit, a first LED circuit and a second LED circuit, and the microcontroller and the communication unit are electrically coupled to each other;
• starting a control application program loaded into the mobile device;
• inputting a brightness parameter from a display interface of the control application program, wherein the brightness parameter is obtained from a selection of a first operational gesture received by the control application program, and the mobile device has a backlight source synchronously changing a display brightness with the first operational gesture through a backlight source adjustment unit of the control application program, and stays at the display brightness corresponding to the brightness parameter after the brightness parameter is selected;
• inputting a color temperature parameter by the control application program, wherein the color temperature parameter is obtained from a selection of a second operational gesture received by the control application program, and the backlight source of the mobile device displays and changes a color temperature, according to the second operational gesture synchronously through the backlight source adjustment unit of the control application program, and stays at the color temperature corresponding to the color temperature parameter after the color temperature parameter is selected;
• and
• placing the mobile device near the passive light board, so that the mobile device and the communication unit form a near field communication connection to pre-write the brightness parameter and the color temperature parameter into the microcontroller;
• so as to performing a display status pre-writing to the passive light board which has not been powered on, and after the passive light board has installed a driver electrically coupled to the microcontroller, the first LED circuit and the second LED circuit, the microcontroller reads and computes the brightness parameter and the color temperature parameter to generate an execution instruction, and then sends the execution instruction to the driver, so that the driver drives the first LED circuit and the second LED circuit according to the execution instruction to let the passive light board display in compliance with the brightness parameter and the color temperature parameter.