Coordinate input device having enhanced touch sensing performance

Abstract

The coordinate input device of the present invention includes a sensing panel that has a plurality of sensing strip antennas, and a sensing control circuit that controls the sensing panel to sense a touch input and calculate corresponding touch input coordinates to provide the coordinates to a host. The coordinate input device of the present invention may also include a sensing control circuit that calculates touch input coordinates based on a variation in electrical characteristic values related to the impedance matching of a scan signal with respect to the touch input of an electrostatic object, and senses all of the touch inputs of the electrostatic object and a stylus pen by using the same and one sensing panel without having a separate digitizer panel for sensing the respective touch inputs of the stylus pen, by using the change function of a touch sensing mode.

Description

technical field [0001] The present invention relates to a coordinate input device, and in more detail, relates to a coordinate input device capable of detecting touch input of an electrostatic object and capable of detecting touch input of a stylus with a built-in resonant circuit. Background technique [0002] Coordinate input devices such as touch screens or digitizers are widely used in computer-based user interfaces. In the case of a touch screen, various types of detection panels are used depending on the type of touch detection. Typical touch detection methods include a resistive film method, an electrostatic method, an infrared method, an ultrasonic method, a camera method, and the like. In the case of an electrostatic method, it is widely applicable to total small mobile devices such as smartphones or tablets. On the other hand, in the case of a digitizer, since fine touch input is possible, it is widely applicable to image application fields. [0003] Recently, i...

AI Technical Summary

Problems solved by technology

However, the detection panel and the digitizer panel of the electrostatic method are separately installed in the equipment, which causes an increase in price

In addition, in the case of an electrostatic touch panel, the touch panel is located on the front surface of the display panel, so there are restrictions on the use of transparent electrodes or manufacturing

As long as the electrostatic touch panel is arranged on the back of the display panel, many advantages may be obtained in terms of technology and production. However, until now, the touch detection performance of the electrostatic touch panel has not yet reached the above-mentioned level.

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