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Thin Sheet Scanning Device Disclosure Number: IPCOM000016183D
Original Publication Date: 2002-Aug-17
Included in the Prior Art Database: 2003-Jun-21

Publishing Venue



The development of electronic technology for the high performance computer and communication systems brings the high performance and density device technologies that also suitable for high resolution imaging purpose. The size and dimension of the fabricated transistors are well below the imaging pixel dimensions. To make use of these technologies we can make high resolution compact and portable imaging device for scanning, copy and digital picture extraction purposes to replace the existing bulky and inconvenient machines. We have proposed using light emitting devices for lithography applications as well as FET devices for display and IC components [1,2]. By integrating the light emitting devices and light sensing FET devices on the same substrate we can make a highly portable scanning data/image collecting device, such as a sheet scanner. A sheet scanner is not only compact in size but also can perform the scanning function on books, magazine, that usually inconvenient to scan due to the bonded pages. By using solid-state light emitting device and sensor array in the micro cell structure, the emitting and receiving of signal light can be accomplished through a large sheet array instead using the mechanical moving light source. This makes the sheet-size scanning device a very useful input peripheral device compared to the rigid surface and bulky copy and scanning machines since the imaging collecting device is thin enough to insert between the pages of a book or a magazine it is more compact to carry and easy to use for the data/image collection purpose. The sheet-scanning machine (100) is shown in Figure 1. There are two major parts in this device, sheet scanner (120) and the electronically control compartment (110). The sheet scanner has several layers of components in its structure, top protection layer, light emitting device, FET sensing device, interconnect and back supporting layer. More detailed description of these layers and their functions are listed in the next paragraph. The overall thickness is thin enough thus it can be placed on top of a book, magazine or insert between pages. This makes it to be a convenient scanning or copy device compared to the existing scanning and copy machines. Also, since these layers are all made of solid-state materials, the power consumption is much lower than the mechanical scanning device. It is possible the complete system can be operated using battery power. This can increase more portability to this device. The light intensity requirement is low compared to a conventional scanner since the light source, receiver transistors are located in close proximity to the scanned object. The control compartment (110) contains the electronic, such as driver and receiver for the scanning sheet, operation control electronic (130), data buffer memory, power supply unit and data output port (140). In Figure 2 the detailed layer structure is shown to indicate the cross section of this device. There are 4 layers of materials in this scanning device (200). The top layer (210) that is a transparent protection layer is used to have direct contact with the subject to be scanned. Since this layer is thin enough, the overall path between the lights emitted from the light emitting diode until the light are absorbed by the photo sensor is much shorter than the conventional mechanical scanning device. The dispersion of the light is controlled and the size is confined. Thus the intensity of the light required is much reduced. Only the object within the pixel will be detected in this scheme. There is no angle between the emitted light and reflect light. The second layer (220, 230) is the matrix of light emitting diodes and FET sensing device. These two types of device can be fabricated within the same plane or in