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Touch display device and touch sensing method

A touch display device and touch sensing technology, applied in the direction of instruments, electrical digital data processing, data processing input/output process, etc., can solve the problem of high production cost and surface acoustic wave touch screen can only sense soft Touch objects, APR touch screen can not achieve multi-touch and other problems, to achieve the effect of high light transmittance

Inactive Publication Date: 2017-01-25
INTERFACE TECH CHENGDU CO LTD +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The above two types of touch screens in the prior art have some defects in practical applications, such as surface acoustic wave touch screens, for the precision and accuracy of touch control, multiple acoustic wave transmitting transducers and acoustic wave receiving transducers need to be provided. And set reflectors around the screen, resulting in higher production costs; the surface acoustic wave touch screen can only sense soft touch objects, such as fingers, touch gloves touch; the condition of the screen surface, such as scratches and dirt etc. will affect the touch response; in addition, in surface acoustic wave touch, multi-touch will cause delay problems, such as 10000fps (Frames Per Second, the number of frames per second) sensor needs 6~8ms Response time
[0005] In addition, for APR touch sensing, the signal processing is more complicated, and the APR touch screen is only suitable for single-touch and cannot realize multi-touch

Method used

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  • Touch display device and touch sensing method
  • Touch display device and touch sensing method
  • Touch display device and touch sensing method

Examples

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no. 1 example

[0023] The touch sensing method of the present invention will be described below in conjunction with the first embodiment of the present invention.

[0024] First, a pulse signal is sent to the ultrasonic transducers 20 , and based on the pulse signal, each ultrasonic transducer 20 sequentially transmits and receives ultrasonic pulses in a certain order. Specifically, start an ultrasonic transducer 20 to send ultrasonic pulses in the first time period, receive ultrasonic pulses in the subsequent second time period, stop the ultrasonic transducer 20, and start the next ultrasonic transducer 20 in the second time period. The ultrasonic pulses are sent out in three time periods, and the ultrasonic pulses are received in the subsequent fourth time period, and all the ultrasonic transducers 20 are activated in sequence, so as to scan the touch-sensitive surface of the display panel 10 .

[0025] see figure 2 , during the emission period of each ultrasonic transducer 20 , the ultr...

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Abstract

A touch display device, comprising a display panel and at least one ultrasonic transducer, at least one ultrasonic transducer is arranged on one side of the display panel and closely arranged along at least one side of the display panel to emit light that can cover the entire display panel surface and correspondingly receive all the reflected ultrasonic waves on the entire display panel surface. The invention also relates to a touch sensing method.

Description

technical field [0001] The present invention relates to a touch display device, and also relates to a touch sensing method. Background technique [0002] At present, the touch screens on the market can be divided into surface acoustic wave, infrared and capacitive touch screens according to the working principle. Among them, the surface acoustic wave (Surface Acoustic Wave, SAW) touch screen has high resolution, fast response speed and good stability. And the characteristics of high light transmittance, are widely used. A surface acoustic wave touch screen in the prior art generally includes a screen, several transmitting transducers, several receiving transducers and several reflectors. The surface acoustic wave touch screen is to install an ultrasonic transmitter and an ultrasonic receiving transducer at the corner of the glass substrate, and reflective strips are installed on the four sides of the substrate. The ultrasonic transmitting transducer, and two corresponding ...

Claims

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Application Information

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IPC IPC(8): G06F3/041G06F3/043
CPCG06F3/0412G06F3/043
Inventor 王娟
Owner INTERFACE TECH CHENGDU CO LTD
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