Touch panel and touch position detection method of touch panel

A touch panel, comprising:

• a touch unit that receives a touch;
• a light source unit array positioned along a first edge of the touch unit and including a first light source and a second light source;
• and
• a detection unit array positioned along a second edge facing the first edge of the touch unit and including a detection unit generating a detection signal by detecting light from the light source unit array,
• wherein the first light source radiates light having a first optical axis to the touch unit, the first optical axis extending in a first direction that makes a first angle with respect to a reference direction,
• the second light source radiates light having a second optical axis to the touch unit, the second optical axis extending in a second direction that makes the first angle with respect to the reference direction, and
• the first direction and the second direction are opposite of each other with respect to the reference direction, wherein the reference direction extends between the light sourc eunit array and the detection unit array perpendicularly to the second edge.