Backlight adjusting system and method

A backlight adjusting method to be implemented by a system for adjusting a backlight brightness of a light emitting element for a display panel based on an ambient light around the display panel, said backlight adjusting method comprising steps of:

• (a) configuring the system to calculate a target display brightness value of the display panel based on an actual ambient brightness value of the ambient light, a predetermined optimal ambient brightness value of the ambient light, and a predetermined optimal display brightness value of the display panel determined according to the predetermined optimal ambient brightness value;
• (b) configuring the system to obtain a target pulse duty value based on the target display brightness value;
• and
• (c) configuring the system to adjust the backlight brightness of the light emitting element based on the target pulse duty value,
• wherein the target display brightness value=the actual ambient brightness value×the predetermined optimal display brightness value/the predetermined optimal ambient brightness value.

A backlight adjusting system adapted for adjusting a backlight brightness of a light emitting element for a display panel based on an ambient light around the display panel, said backlight adjusting system, the backlight adjusting system comprising:

• a first brightness sensor configured to detect the ambient brightness of the ambient light and to generate an actual ambient brightness signal accordingly;
• a first analog-to-digital converter electrically coupled to said first brightness sensor and configured to convert the actual ambient brightness signal to an actual ambient brightness value in an analog-to-digital manner;
• a first calculator electrically coupled to said first analog-to-digital converter and configured to calculate a target display brightness value of the display panel based on the actual ambient brightness value, a predetermined optimal ambient brightness value of the ambient light, and a predetermined optimal display brightness value of the display panel determined according to the predetermined optimal ambient brightness value;
• a comparator electrically coupled to said first calculator and configured to compare the target display brightness value with an actual display brightness value of the display panel and to generate a comparison result accordingly;
• a processor electrically coupled to said comparator and configured to adjust a target pulse duty value based on the comparison result;
• and
• a driver electrically coupled to said processor and configured to generate a driving signal based on the target pulse duty value utilizing pulse width modulation techniques for driving the light emitting element so as to adjust the backlight brightness of the light emitting element.