Patent ID: 8593490

Claim:
A voltage regulation method, for regulating a plurality of gray-level voltages provided by a gray-level resistor string in a display panel, the gray-level voltages corresponding to a plurality of gray-level values, the voltage regulation method comprising: providing a plurality of fixed voltages to the gray-level resistor string; dividing the plurality of gray-level voltages and the plurality of fixed voltages into a first voltage group and a second voltage group according to signal-to-noise ratios of the gray-level values, wherein the first voltage group includes a portion of the gray-level voltages and a portion of the fixed voltages, and the second voltage group includes the remaining gray-level voltages and the remaining fixed voltages; selecting one of the fixed voltages to be a specific fixed voltage; regulating a voltage level of the specific fixed voltage; determining whether the specific fixed voltage is divided into the first voltage group; when the specific fixed voltage is divided into the first voltage group, measuring a first luminance value as the display panel displays one of the gray-level voltages in the second voltage group and determining whether to re-regulate the voltage level of the specific fixed voltage according to the first luminance value; when the specific fixed voltage is not divided into the first voltage group, measuring a second luminance value as the display panel displays the specific fixed voltage and determining whether to re-regulate the voltage level of the specific fixed voltage according to the second luminance value; and re-selecting the specific fixed voltage until the fixed voltages are sequentially regulated, wherein the step of determining whether to re-regulate the voltage level of the specific fixed voltage according to the first luminance value comprises: determining whether a first difference between the first luminance value and a first ideal luminance value corresponding to the one of the gray-level voltages in the second voltage group is inside a predetermined error range; when the first difference between the first luminance value and the first ideal luminance value is not inside the predetermined error range, re-regulating the voltage level of the specific fixed voltage; and when the first difference between the first luminance value and the first ideal luminance value is inside the predetermined error range, returning to the step of re-selecting the specific fixed voltage until the fixed voltages are sequentially regulated.