Abstract: A zooming camera module includes a first lens group, a second lens group, and a third lens group. The first lens group is implemented on an optical axis at a fixed position, and has a negative total optical power. The second lens group is implemented on the optical axis and can be moved back and forth along the optical axis, to achieve zooming and focusing. The second lens group has a positive total optical power, and includes a liquid lens unit and at least one lens with non-zero optical power, wherein the at least one lens and the liquid lens are separately or integrally configured. The third lens group is implemented on the optical axis at a fixed position, and has a non-zero total optical power.

Abstract: An optical touch system includes a substrate, at least one sensor, a processing unit and an analysis unit. The substrate has a touch region. The at least one sensor is used for capturing a full-size image of the touch region, wherein the full-size image includes a central region image near a light axis of the at least one sensor, and a side region image. The processing unit is used for sampling the central region image to obtain a central compressed image and transmitting the central compressed image and the side region image under a normal mode. The analysis unit is used for analyzing the central compressed image and the side region image to obtain a touch point coordinate.

Abstract: An optical touch system includes a first light source, a second light source, a sensing module and a processing module. The lighting timing of the second light source differs with the lighting timing of the first light source by a phase. The sensing module is for capturing a sensing image related to a touch point on a panel, and receiving a first bounce light of the touch point corresponding to the first light source and a second bounce light of the touch point corresponding to the second light source. The processing module is for obtaining angle information according to the sensing image, calculating a phase difference between the first bounce light and the second bounce light to obtain distance information, and determining a coordinate corresponding to the touch point according to the angle information and the distance information.

Abstract: A zooming camera module includes a first lens group, a second lens group, and a third lens group. The first lens group is implemented on an optical axis at a fixed position, and has a negative total optical power. The second lens group is implemented on the optical axis and can be moved back and forth along the optical axis, to achieve zooming and focusing. The second lens group has a positive total optical power, and includes a liquid lens unit and at least one lens with non-zero optical power, wherein the at least one lens and the liquid lens are separately or integrally configured. The third lens group is implemented on the optical axis at a fixed position, and has a non-zero total optical power.