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SFH4059S Datasheet(PDF) 2 Page - OSRAM GmbH |
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SFH4059S Datasheet(HTML) 2 Page - OSRAM GmbH |
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2 / 14 page  August 13, 2010 page 2 of 14 complexity. The third constraint, the ambient light sensitivity, remains a very relevant design challenge. There are several methods to deal with this, both optically and electrically. This will be discussed, among other issues, in ‘General Design Considerations’ in section four. At the end a brief product selection guide provides information for a rapid and successful design-in. 2. Overview of IR Touchscreen Principles Generally speaking, IR touchscreens have several desirable attributes that are not all present in competing technologies. The object used to generate the ‘touch’ can have almost any shape and size and be made of almost any material. This is in contrast to most other touchscreen technologies where some sort of stylus is required. As IR touchscreens are a solid state technology they have no moving mechanical parts or anything placed on top of the display to reduce the brightness. The latter fact ensures crystal clear image quality and robustness over time. This is especially important as many device or display vendors sell their products on the customers perceived display quality. During the past years several different technologies for IR touchscreens have come up on the market. The major ones will be explained in the following sections. 2.1 IR Matrix-based Touchscreens The traditional IR matrix touchscreen technology is based on the interruption of a light path in an invisible light grid in front of the screen. A simplified schematic is presented in Fig. 1. In this concept an array of emitters (IREDs) is employed and covered behind two adjacent bezels of the screen frame and creates the invisible optical grid. The opposite bezels contain the respective detector arrays (typically phototransistors or -diodes). This arrangement shields the active parts from environmental influences and maintains the quality and brightness of the image. Additionally it enables screen retrofits, and is in fact completely independent of the screen for all practical purposes. If an obstacle (e.g. a stylus or finger tip) appears inside the grid matrix it interrupts the light beams and causes a reduction of the measured photocurrent in the corresponding detectors. Based on this information the x- and y-coordinates can be easily obtained. The IR-matrix based principle is suitable to recognize static operations as well as motions. It is not really suitable for high resolution motion detection, e.g. handwriting recognition. Fig. 1: Concept of an IR matrix-based touchscreen. The influence of a stylus on the photocurrent of individual detector elements is sketched below. |
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