Zenith Electronics Corporation

Other

Elo Touchsystems, Inc.

Cng Research Company

Tyco Electronics Corporation

Zenith Radio Corporation

Extel Corporation

Motorola Corporation

Elo Touch Solutions, Inc.

Touch Panel Systems, K.k.

Helipump, Inc.

Robert J Adler

Paul Strauss

Joel Christopher Kent

Charles J Prazak

Howard G Lange

James R Fendley

Johann Steiner

Sam H Kaplan

William R Brown

Coleman B Brosilow

Nelson C Gardner

Charles Dudley Copper

Geoffrey D Wilson

Mark Fogelson

Paulo I Gomes

Peter C Desmares

John H Coult

Chenggang Xie

Yoshikazu Tanaka

Hua-Sou Tong

Paul Martin Adriani

Richard M Gorski

John M Jarosz

Johann T Trujillo

Jonathan David Wineland

Michael A Petrik

Joyce K Yamamoto

Peter A Smith

Norman F Gioia

Wayne R Chiodi

Prakash Thyaga Palepu

Shigeki Kambara

Hiroshi Kaneda

Arie Ravid

W Jeffrey Cook

W Edward Samuels

Jeffrey L Sharp

L Curtis Foster

John L Rennick

Masao Takeuchi

Charles Dudley Cooper

Paul Jerome Fehrenbach

Cheng-Kuang Wu

Lionel A Watson

Bruce W Maxfield

Lun Auyang

Yin-Chang Liu

Johan Steiner

A touch sensor comprises a substrate capable of propagating acoustic waves and includes a first surface having a touch sensitive region. A first sidewall intersects the first surface along a first edge. The first edge is configured to propagate a first acoustic wave along the first edge. The first acoustic wave may be a one-dimensional edge wave. A wave converter converts the first acoustic wave to a second acoustic wave, and the first surface is configured to propagate the second acoustic wave across the touch sensitive region.

Acoustic touch sensor utilizing edge waves

Acoustic touch sensor

A touch sensor having an acoustic substrate, an acoustic transducer, and an acoustically diffractive grating is provided. The grating is disposed between the transducer and the substrate, so that acoustic energy from the transducer is coupled to an acoustic wave propagating along the surface of the substrate. If used in a display device, the combination of the transducer and grating may provide a low profile that allows the assembly to be more easily placed between the acoustic substrate and a bezel placed in front of the substrate. No acoustic components need be mounted on the rear surface of the substrate, allowing the acoustic substrate to be formed on the front surface of the display device.

Acoustic touch sensor with low-profile diffractive grating transducer assembly

The present invention is directed to a multilayer substrate for use in touchscreen and touch sensor applications. The substrate, including a microsheet, a polymer sheet, and a plate supports the propagation of acoustic waves, including Love waves and Rayleigh-like waves. The microsheet and plate may be fabricated from glass, metal, or other suitable materials depending on the desired application for the touchscreen. The polymer sheet may be fabricated from polystyrene, polyacrylates, polyether sulfones, or polycyclic olefins. The disclosed touchscreen substrates are thin but durable and have increased touch sensitivity with decreased sensitivity to water and other surface contaminants.

Acoustic touch sensor with laminated substrate

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

A field emission display ( ) includes a cathode assembly ( ), an anode plate ( ), and a spacer ( ), which extends between the cathode assembly ( ) and the anode plate ( ). The spacer ( ) is comprised of a spacer material having a dielectric constant less than 100. A discharging period neutralizes positive electrical charge ( ) and renders the spacer ( ) invisible to a viewer of the field emission display ( ). Operating a field emission display ( ) to render a spacer ( ) invisible by providing a cathode, assembly ( ), an anode plate ( ), and a spacer ( ) comprised of a spacer material with a dielectric constant less than 100 and neutralizing positive electrical charge ( ) on spacer ( ).

Field emission display having an invisible spacer and method

Adaptive frequency touchscreen controller using intermediate-frequency 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

An electroluminescent display is formed from a matrix of organic based light emitting diodes (LEDs) backed by an array of low resistance, high amperage conductors joined to the LED matrix at many points, in order to ensure low voltage drops along each line in line-at-a-time operation of the display. A method of joining the current carrying conductors to the matrix so as not to disturb the LED assembly through mechanical stress is also disclosed.

Organic based led display matrix

An improved cathode ray tube yoke assembly and cathode ray tube system is capable of reducing or eliminating cathode ray tube geometrical image distortions caused by an inherent non-linear relationship between magnetic deflection fields inside the tube and electron beam spot deflection. The yoke assembly comprises horizontal and vertical windings for producing horizontal and vertical deflection fields and one or more non-linear magnetic elements. The magnetic elements produce a non-linear relationship between driving currents and magnetic deflection fields inside the tube which substantially compensates for the inherent non-linear relationship between deflection fields and electron beam spot deflection. In the preferred embodiment, the inductances of the yoke windings remain constant during operation.

Non-linear yoke assembly and cathode ray tube system for correction of

An apertured member for use in a CRT screen manufacturing device, or lighthouse, is disclosed as being spaced from the light source and having a light-transmitting slot of approximately parabolic shape. The axis of the parabola which is perpendicular to the CRT screen being made. This apertured member is useful for correcting beam landing misregistration errors resulting from the use of a self-converging yoke with the CRT.

Optical aperture device for manufacturing color cathode ray tubes

In a color CRT with an in-line gun and a pin cushion correcting yoke, there is disclosed an eyebrow effect electronoptical distortion correction device comprising two pair of coils, each pair having a coil on each outer electron beam side of the neck in the plane of the beams. The coil pairs are spaced apart along the Z-axis between the gun and the yoke and are driven by a sawtooth current having a bow-tie envelope synchronous with the raster scan to correct the dynamic, antisymmetrical eyebrow effect apparent as a purity defect on the raster.

Cathode ray tube dynamic electron-optic eyebrow effect distortion

A laser based accelerometer system uses small motion induced shifts in frequency to measure the motion of an object without contact thereof. This technique is particularly useful for determining the vibratory and velocity characteristics of objects that are otherwise inaccessible for direct motion measurement by contact sensors.

Light-operated accelerometer-type techniques

Method and apparatus are disclosed for tensioning uniform foil shadow masks by clamping the edges of a mask and moving the clamps through a preselected fixed displacement, thereby obviating the need for extensive controls on the tensioning process.

Mechanically indexed mask stretching apparatus

Growing community of inventors

Shaker Heights, OH, United States of America

Robert J Adler