Unlock instant, AI-driven research and patent intelligence for your innovation.

Position detection device

A detection device and a technology for noise detection, applied in optics, instruments, electrical and digital data processing, etc., can solve the problems that the differential amplifier cannot fully eliminate the influence of noise and the intensity of noise.

Inactive Publication Date: 2016-11-09
WACOM CO LTD
View PDF4 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, since the noise generated by a display device such as a liquid crystal panel is extremely strong compared to the signal sent from the stylus, it is difficult to sufficiently eliminate the influence of the noise using only a differential amplifier

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Position detection device
  • Position detection device
  • Position detection device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0040] figure 1 It is a block diagram of the first embodiment of the position detection device of the present invention. figure 1 Among them, 11 is a transparent sensor, which is provided with an X electrode formed by arranging a plurality of ITO (Indium Tin Oxide: indium tin oxide) lines (line) in the X-axis direction of the X and Y coordinates of the transparent sensor 11, and A Y electrode formed by arranging a plurality of ITO lines in the Y axis direction of the X and Y coordinates. The transparent sensor 11 is integrally arranged with a not-shown LCD (Liquid Crystal Display: liquid crystal display) panel, and the position detection area of ​​the transparent sensor 11 coincides with the display area of ​​the LCD panel. In addition, the X electrode and the Y electrode on the transparent sensor 11 are connected by an ACF (Anisotropic conductive film: anisotropic conductive film), and are connected to a printed circuit board not shown via a flexible substrate not shown.

...

no. 2 approach

[0107] Figure 12 It is a configuration diagram of a position detection device according to a second embodiment of the present invention, showing an example of the case of detecting and inputting a finger's touch position. Figure 12 in, with figure 1 The same structural elements are denoted by the same reference numerals. That is, 11 is a transparent sensor, 12 is a noise detection electrode, 13 is a noise detection circuit, 14 is a pulse generation circuit, 15 is a phase control circuit, 21 is a control circuit, 22 is a bandpass filter circuit, 23 is a switch, 24 is a Detection circuit, 25 is an AD conversion circuit, and 26 is a microprocessor.

[0108] 32 is an X selection circuit for selecting one of the X electrodes of the transparent sensor 11 , and 33 is a Y selection circuit for selecting one of the Y electrodes of the transparent sensor 11 . 34 is a signal transmitter that generates and outputs a signal of a certain frequency. The output signal of the signal tran...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Provided is a position detection device that can accurately detect and input the coordinate position of a stylus without being affected by noise generated by a display device that can refresh display in a regular cycle. The position detection device comprises: a noise sensor disposed near the display device or a drive circuit of the display device; a noise detection circuit that outputs noise detection information if the noise input to this noise sensor is at or above a prescribed level; a pulse generation circuit that generates pulses on a cycle identical to the known cycle of the horizontal synchronization pulses of the display device; a phase control means that controls the phases of the output pulses of the pulse generation circuit so that the frequency at which the noise detection information is output during a prescribed period synchronized with the output pulses of the pulse generation circuit is equal to or greater than a constant value; and a receiving circuit that receives signals from a finger or the stylus in synchronization with the timing of the output pulses of the pulse generation circuit.

Description

technical field [0001] The present invention relates to a transparent position detection device arranged on the front surface of a display device and capable of inputting with a finger or a stylus. Background technique [0002] In recent years, tablet-type information terminals equipped with touch panels have been widely used. Among such devices, there is a device capable of inputting with a stylus pen in order to easily input handwritten characters or draw pictures, illustrations, etc. that are complicated for fingers. As a pen input technique for this purpose, the method disclosed in Patent Document 1 (JP-A-63-70326) is widely used. [0003] According to the method of Patent Document 1, a resonant circuit is provided for a position indicator as a stylus, and the indicated position is detected by electromagnetic induction with a tablet. However, the sensor board constituting the tablet needs to be provided on the back of the display device. This has problems in that the d...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/041G06F3/044
CPCG06F3/046G06F3/04182G06F3/0442G06F3/0446G02F1/13338G02F1/134309G02F1/136286G02F1/1368G06F3/03545G06F3/0383G06F3/0412G06F2203/04102G06F2203/04104G06F2203/04106G06F2203/04107G02F1/136295
Inventor 桂平勇次朝克
Owner WACOM CO LTD