Elo Touchsystems, Inc.

Daicel Chemical Industries, Ltd.

Shigeki Kambara

Joel Christopher Kent

Hiroshi Kaneda

Paulo Irulegui Gomes

Robert J Adler

Soichi Kuwahara

James L Aroyan

Osamu Majima

Kazuo Notsu

Arie Ravid

Toru Kitaguchi

Masayoshi Furukawa

Masao Takeuchi

Kazushi Takahashi

Bruce W Maxfield

Tohru Kitaguchi

A process for producing for a material for an organic electroluminescent device having an emission center comprises irradiating a laser beam to implant an emission center-forming compound constituting a source into a target having at least one function selected from an electron-transporting function and a hole-transporting function. According to the process, the laser beam and at least the target are relatively moved with irradiating the beam to form the emission center with a predetermined pattern. Moreover, the source and the target being in contact with each other may be moved relative to the laser beam for forming the emission center with a predetermined pattern. Further, the emission center at an area, corresponding to an interference pattern of an interference light, of the target may be formed by irradiating the interference light of the laser beam.

Material for organic electroluminescent device and its manufacturing method

An acoustic touchscreen ( ) has transmitting transducers ( ) for generating acoustic signals which are deflected across a touch-sensitive area ( ) by an array of partially acoustically reflective elements . A touch on the touch-sensitive area causes a perturbation in the acoustic signals. After traversing the touch-sensitive area, the acoustic signals are redirected by another array of partially acoustically reflective elements , towards receiving transducers ( ), where the signals (and any perturbations) are sensed. To accommodate touchscreens having narrow border regions ( ), the acoustic signals are propagated across the border regions using acoustic waveguides ( ). The waveguide confines the acoustic signals to traveling along a narrow path width, but yet permit them to be deflected across the touch-sensitive area. In this manner, the transducers and reflective elements can in turn be of narrower construction and can fit within narrow border regions.

Acoustic touchscreen having waveguided reflector arrays

A method and apparatus for adapting an acoustic touchscreen controller to the operating frequency requirements of a specific touchscreen are provided. The adaptive controller can either utilize look-up tables to achieve the desired output frequency or the it can use a multi-step process in which it first determines the frequency requirements of the touchscreen, and then adjusts the burst frequency characteristics, the receiver circuit center frequency, or both in accordance with the touchscreen requirements. In one embodiment, the adaptive controller compensates for global frequency mismatch errors. In this embodiment a digital multiplier is used to modify the output of a crystal reference oscillator. The reference oscillator output is used to control the frequency of the signal from the receiving transducers and/or to generate the desired frequency of the tone burst sent to the transmitting transducers. In another embodiment that is intended to compensate for both global and local frequency variations, the adaptive controller uses a digital signal processor. The digital signal processor, based on correction values contained in memory, defines a specific center frequency which preferably varies according to the signal delay, thus taking into account variations caused by localized variations in the acoustic wave reflective array. In yet another embodiment, a non-crystal local oscillator is used to provide the reference signal in the adaptive controller. The use of such an oscillator allows the controller to be miniaturized to a sufficient extent that it can be mounted directly to a touchscreen substrate. A feedback loop is used to compensate for oscillator drift. A discriminator circuit determines the degree of deviation from the desired frequency. The output from the discriminator is used to adjust the frequency of the local oscillator such that it tracks the frequency of the touchscreen.

Adaptive frequency touchscreen controller employing digital signal processing

An acoustic touch sensing device, comprising a substrate, having a surface; and an acoustic wave transducer, transducing a bulk wave in said substrate propagating through said substrate along an axis intersecting said surface, wherein energy of said bulk wave is coupled to a wave having a converted wave mode with appreciable energy at said surface and propagating along said surface. The device may include a set of scattering centers to couple the bulk wave to a Rayleigh wave or plate wave. The Rayleigh wave or plate wave may be dispersed over a region of the substrate, and analyzed to detect a perturbation indicative of a position of touch.

Grating transducer for acoustic touchscreens

Printing plate materials and method of producing the same

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Himeji, Japan

Shigeki Kambara