Abstract: A position-detecting device is provided. The optical position-detecting device essentially comprises a light-emitting source, a mask, and a light-detecting device, in which a plurality of grating-holes are provided on the mask for allowing of a projecting light source, generated by the light-emitting source, to pass therethrough, and the projecting light source passing through the grating-holes are then absorbed by a plurality of light-detecting element provided on the light-detecting device. Each light-detecting device is provided as a non-rectangular mode, while an interval space is existed between any two of adjacent light-detecting elements. The partially active area of one of the light-detecting elements is naturally provided at the vertical extension of the interval space, and thus diminishing disadvantages of misdetermination and low sensitivity of the light-detecting device induced by the presence of an interval space.

Abstract: The present invention provides a detection device, which comprises a light-emitting device for projecting a light source to a slotted mask. An optical detector is used to detect the light passing through the slots. A plurality of optical detection units are disposed in the optical detector. Each of the optical detection unit comprises an optical detection component for converting light into a current signal. The optical detection component is connected to a signal selection circuit via a current mirror circuit. When the current of one of optical detection units is maximal in all of the optical detection units and larger than a half of the total current, the optical detection unit will output a voltage signal of high voltage. Otherwise, it will output a voltage signal of low voltage. The present invention has the advantages of high resolution and high noise immunity.

Abstract: A smart light emitting diode cluster and system includes a central processing unit (CPU) and a plurality of LED cluster strings, each comprising a plurality of LED cluster connected in series. Each LED cluster includes an LED drive circuit and a plurality of LEDs. The CPU receives external input image signal, and then desired control signal and image data are sent to the LED cluster strings by appropriate processing. The control signal is used to switch the LEDs in the cluster to generate desired image and related color variation. The control signal and image data are transferred to the next LED cluster by the present LED drive circuit. In this manner, the control signal and image data are progressively transferred from the first to the last cluster so that a whole image with color variation can be displayed by all the LEDs in the system.

Abstract: A sampled-data, current-mode circuit implements analog functions in a standard digital process. Among sampled-data current-mode circuits, the current S/H (CSH) circuit is a key component. This fully differential CSH circuit was implemented in a 1.2 .mu.m N-well double-poly double metal CMOS technology adapted to 8-bit resolution at a 15 MHz sampling rate.