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In-pixel ultrasonic touch sensor for display applications

A touch sensor, pixel technology, applied in the input/output process of instruments, data processing, calculations, etc., can solve problems such as cost complexity, light loss, etc.

Inactive Publication Date: 2015-09-16
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both technologies are manufactured independently of the display and are attached to the front of the display, causing additional cost, complexity, and some loss of light due to absorption

Method used

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  • In-pixel ultrasonic touch sensor for display applications
  • In-pixel ultrasonic touch sensor for display applications
  • In-pixel ultrasonic touch sensor for display applications

Examples

Experimental program
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Embodiment Construction

[0043] figure 1 is a schematic diagram depicting a planar piezoelectric transducer emitting ultrasound pulses displayed by an exemplary liquid crystal display (LCD). The display 100 includes an ultrasound transmitter 102 and a display panel 104 . In this example, display 100 includes a backlight 106 and display panel 104 includes an LCD backplane 108 that also includes an array of piezoelectric receptors 110 and a color filter layer 112 . As explained in more detail below, each receiver array element is incorporated into a corresponding pixel. Ultrasound pulses reflect off the front surface of the display due to the large density difference between the air and the filter glass. However, if an object having a density greater than air, such as a fingertip, a stylus, or a writing brush, touches the display front surface, more ultrasonic energy is absorbed by the object and the reflected ultrasonic energy is weaker. Thus, the piezoelectric response at each display pixel is rel...

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Abstract

A video display is provided with a planar piezoelectric transmitter to transmit ultrasound signals, and a display panel including a plurality of pixels. Each pixel has a data interface to accept a video signal with a variable voltage associated with a range of light intensity values, and to supply a touch signal with a variable voltage derived from a range of reflected ultrasound signal energies. Each pixel is made up of a light device to supply light with an intensity responsive to the video signal voltage, and a storage capacitor to maintain a video signal voltage between refresh cycles. A piezoelectric transducer accepts a reflected ultrasound signal energy and maintains a touch signal voltage between refresh cycles. In one aspect, the storage capacitor and the piezoelectric transducer are the same device. The light device may be a liquid crystal (LC) layer or a light emitting diode.

Description

technical field [0001] The present invention relates to image display technology, and more particularly, to ultrasonic wavelength touch sensors fabricated as an integral part of display pixels. Background technique [0002] While there are many touch sensor technologies available, the market is currently dominated by two technologies. Low-cost systems that do not require multi-touch capability often use resistive touch, which measures the resistance of a conductive network deformed by a touch that creates a connection between the X and Y bus lines. The most common multi-touch sensing technology, known as projected capacitive, measures the capacitance between each pair of electrodes in a cross-point array. The capacitance of a finger approaching the sensor changes the mutual capacitance at that point in the array. Both of these technologies are manufactured separately from the display and are attached to the front of the display, causing additional cost, complexity, and som...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/043G06F3/041
CPCG06F3/044G06F3/043G06F3/0412
Inventor P·J·许勒T·阿芬塔基斯J·W·哈策尔
Owner SHARP KK