Truelight Corporation

Chih Cheng Chen

Jin Shan Pan

Chia Ching Chang Chien

Hung-Wei Tseng

Bing-Cheng Lin

Zhi Kuei Huang

A vertical-cavity surface-emitting Laser (VCSEL) has a three-trench structure. By forming a first trench within a mesa around the periphery of an output window of the VCSEL, the overall capacitance is decreased and the time used in the oxidation process for an oxidation layer is shortened. By forming a second trench and a third trench on the periphery of the mesa in a step-like concave manner, the mesa becomes a step-like structure having double mesa-layers. Such that, a larger heat-radiating area can be obtained for decreasing thermal effects, while the metal-gap defects of the metal layer can also be avoided. The implant layer is formed around the periphery of the output window for controlling the optical mode and confining the current path. In addition, an output layer is formed on the output window for controlling the output light.

Structure of VCSEL and method for manufacturing the same

A thin optical imaging module of a biometric apparatus includes a first glass substrate, a first optical prism film, a second optical prism film, and an image sensor. The first glass substrate further includes a fingerprint imaging area, a vein imaging area, a contact surface, a reflective interface, and an attaching surface. The first optical prism film adhered to the attaching surface is located under the fingerprint imaging area. The second optical prism film is adhered to a position under the first optical prism film. The image sensor disposed in correspondence to the first glass substrate is located under the attaching surface.

Thin optical imaging module of a biometric apparatus

A biometric authentication device uses IR-VCSELs as light sources for performing biometric authentication by providing clear images. A light guide module is introduced to minimize the size of the device. Moreover, the biometric authentication device uses a single image sensing module to gather a vein image and a fingerprint image into the same detection signal which is then analyzed and compared with the pre-stored vein feature data and fingerprint feature data.

Biometric authentication device and method

A biometric authentication device uses IR-VCSELs as light sources for performing a better biometric authentication by providing clearer images. A light guide module is introduced to minimize the size of the device. Moreover, the biometric authentication device uses a single image sensing module to gather the vein image and the fingerprint image into the same detection signal which is then analyzed and compared with the pre-stored vein feature data and fingerprint feature data. Therefore, the biometric authentication device can achieve an approach in lowering hardware costs, simplifying circuit designs and providing an outstanding performance.

Growing community of inventors

Zhongli, Taiwan

Chih Cheng Chen