Optical switch keyboard adjustment method and optical switch keyboard using the same

A method for adjusting an optical switch keyboard having a key unit, wherein the method comprises:

• applying a scan signal to one of a plurality of scan lines by a control unit at a first scan time point;
• emitting a light by a light source according to the scan signal;
• detecting the light by a detecting element to generate a detecting electric signal;
• reading the detecting electric signal by the control unit at a time point being the first scan time point plus a delay period to obtain a first read signal voltage;
• wherein when the first read signal voltage is outside a voltage range of the pressed state of the key unit, the control unit increases the length of the delay period by a second predetermined amount to obtain an adjusted delay period.

An optical switch keyboard, comprising:

• a plurality of scan lines;
• a control unit, coupled to the plurality of scan lines, wherein the control unit applies a scan signal to one of the scan lines;
• a plurality of key units, wherein any one of the key units comprises:
• a light source, configured to emit a light according to the scan signal;
• and
• a detecting element, wherein when the detecting element detects the light, the detecting element generates a detecting electric signal, and the control unit reads the detecting electric signal to obtain a first read signal voltage;
• wherein when the first read signal voltage is outside a voltage range of the pressed state of one of the key units, the control unit increases the period of the scan signal by a first predetermined amount to obtain an adjusted scan signal.

An optical switch keyboard, comprising:

• a plurality of scan lines;
• a control unit, coupled to the plurality of scan lines, wherein the control unit applies a scan signal to one of the scan lines at a first scan time point;
• a plurality of key units, wherein any one of the key units comprises:
• a light source, configured to emit a light according to the scan signal;
• and
• a detecting element, wherein when the detecting element detects the light, the detecting element generates a first read signal voltage;
• wherein the control unit reads the first read signal voltage at a second time point, the second time point and the first scan time point are separated by a delay period, and when the first read signal voltage is outside a voltage range of the pressed state of one of the key units, the control unit increases the length of the delay period by a second predetermined amount to obtain an adjusted delay period.