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

Pen input apparatus and pen input method

A technology of an input device and a generation device, which is applied in the field of pen input devices and can solve problems such as inability to detect coordinates

Inactive Publication Date: 2003-07-02
SHARP KK
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] When the noise becomes very large and the integrated voltage value of the induced voltage signal caused by the noise is greater than the reference value compared in the second comparator 226, the problem that the coordinate cannot be detected will occur.

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
  • Pen input apparatus and pen input method
  • Pen input apparatus and pen input method
  • Pen input apparatus and pen input method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] Referring to Fig. 6, the pen input device according to the first embodiment of the present invention includes a liquid crystal display panel 1, a backlight 2, a detection pen 3, and an amplifier 4 connected to the guide electrode of the detection pen 3, for providing The reverse signal generation circuit 5 of the reverse signal ak of the reverse voltage direction on the liquid crystal of 1 is used to generate the detection cycle signal generation circuit 6 of the signal indicating the detection cycle of the coordinates through the detection pen 3, which is used for the detection of the coordinates A gate signal generation circuit 7 that generates a gate signal g1 synchronously with the reverse signal ak during a period is used to sample the signal sk from the amplifier 4 according to the gate signal g1 so as to convert the sampled signal into a DC voltage conversion circuit 11 for a threshold setting circuit 13 for setting a threshold, and a comparison circuit 14 for com...

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

A pen input apparatus includes an inversion signal generation circuit for generating an inversion signal to invert the direction of applied voltage to liquid crystal of a liquid crystal panel. There is a first conversion circuit to detect a voltage induced at a detection pen according to the inversion signal generated by the inversion signal generation circuit for converting the induced voltage into a direct-current voltage. A comparator circuit is included for comparing a voltage value of the direct-current voltage converted by the first conversion circuit with a predetermined value to determine whether the detection pen is close to the liquid crystal panel. A detection period signal generation circuit is used for turning on a back light of the liquid crystal panel when the first conversion circuit is not detecting an induced voltage, and for turning off the back light when the first conversion circuit is detecting an induced voltage.

Description

technical field [0001] The present invention relates to a pen input device and a pen input method for personal computers, word processors and the like. More particularly, the present invention relates to a pen input device and a pen input method for writing handwritten characters and graphic symbols on a tablet provided on a display screen of a display. Background technique [0002] Referring to Fig. 1, conventional pen input device comprises liquid crystal display panel 101, backlight 102, detection pen 103, is used to amplify the amplifier 104 of the induced voltage that produces on the detection pen 103, is used for generating the voltage applied to liquid crystal display panel 101 The reverse signal generating circuit 105 of the signal whose direction is reversed, the gate signal generating circuit 107 that generates the first and second gate signals synchronously with the reverse signal, and the full-wave rectification circuit 108 including the diode bridge, input accor...

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 Patents(China)
IPC IPC(8): G06F3/041G06F3/033G06F3/044G06F3/0488
CPCG06F3/044G06F3/0442
Inventor 平野胜巳
Owner SHARP KK