| 摘要 |
A capacitive touch sensor is provided having sensing path for setting a color parameter to a desired value within a range, the color parameter being color hue, color saturation or color temperature. The sensor has a first mode of operation in which a parameter can be set approximately to a desired value and a second mode in which the value can be refined to the exact amount. In the first mode, the full range of possible values is mapped onto the sensing path and a user touch selects a value within the full range according to its position along the sensing path. In the second mode a finer adjustment is provided for, either by mapping a narrower sub-range of the full range onto the sensing path, or by allowing incremental adjustment of the parameter from the value initially set in the first mode, each incremental unit of adjustment being triggered by the object being displaced through a predetermined threshold displacement along the sensing path. Switching from the first mode to the second mode is triggered if moving displacement of the object along the sensing path from the first point of touch exceeds a minimum threshold value. This provides an intuitive transition for the user from coarse to fine adjustment.
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