Automatic optimisation of touch signal

The method of any preceding claim, wherein the first integration time is the same length as the second integration time.

The method of any preceding claim, wherein a first settling period occurs between the first integration time and the second integration time.

The method of any preceding claim, wherein the ambient light evaluation mode comprising the steps of:

• generating a first set of samples over a first integration time, a second set of samples over a second integration time, and a third set of samples over a third integration time using at least one detector (30b′), and
• applying an ambient light filter to the first, second, and third set of samples to generate a residual ambient light value indicative of ambient light noise,
• wherein the touch apparatus is configured to operate in the data sampling mode with a timing configuration corresponding to the first, second, and third integration time of the determined the ambient light evaluation mode repetition.

The method of any preceding claim wherein the steps of the ambient light evaluation mode are performed once per frame, more than once per frame, or less often than every frame.

The method of any preceding claim wherein the ambient light evaluation mode steps may be performed at the beginning, middle or end of every frame.

The method of any preceding claim wherein the residual ambient light value is determined for a plurality of the detectors of the touch apparatus and wherein the optimal residual ambient light value is determined as a function of the plurality of residual ambient light values.

The method of any preceding claim wherein a total of number of different configurations of the first, second, and third integration times is greater than 2 and wherein the apparatus being configured to cycle through the total of number of configurations in subsequent ambient light evaluation mode repetitions.

The method of any preceding claim wherein the first, second or third integration time have a length of between 3 μs to 30 μs

The method of any preceding claim wherein first second or third integration times are changed in steps of between 0.1 μs and 20 μs each ambient light evaluation mode repetitions.

The method of any preceding claim wherein the optimal residual ambient light value may also be selected as a function of the first and second integration times as well as the residual ambient light value.

The method of any preceding claim wherein the system is configured to not alter the first, second and third integration times used by the optical touch apparatus whilst operating in the data sampling mode whilst a touch interaction with the touch system is occurring.