Focaltech Systems Co., Ltd.

Shih-Hsin Huang

Hsin-Mao Huang

Chih-Hung Kung

Hsiang-Cheng Yu

Hsiang Cheng Yu

Wen-Hsian Huang

A touch panel with a single-layer low-complexity transparent electrode pattern includes a substrate, N sensing electrodes, and M conductive traces. The N sensing electrodes and the M conductive traces are formed on the substrate, where N and M are each a positive integer. Each conductive trace has a specific impedance value and is connected with two sensing electrodes. Any one of the N sensing electrodes is connected with at least another one sensing electrode through at least one conductive trace, such that each sensing electrode has a different RC time constant. N driving signals with different frequencies are sequentially applied to the N sensing electrodes via one of the N sensing electrodes to measure capacitance changes of the N sensing electrodes for detecting one touched sensing electrode.

Touch panel with a single-layer low-complexity transparent electrode pattern and sensing method therefor

A multi-touch system for controlling liquid crystal capacitors to reduce touch sensing interferences includes K gate driving lines, which are divided into N groups each corresponding to a common voltage conductive line. When a display driving signal is applied to an i-th group of gate driving lines for performing a display driving, the liquid crystal capacitor corresponding to the i-th group is set to a predetermined voltage, where i=1 to N. Finally, a touch driving signal is applied to an i-th common voltage conductive line corresponding to the i-th group for sensing touch points, so as to reduce touch sensing affections caused by noises of the liquid crystal display.

Multi-touch system and method for controlling liquid crystal capacitors to reduce touch sensing interference

A method for improving linearity of touch system coordinates first reads two-dimensional raw data of a capacitive touch panel. Next, it reads a pixel and adjacent pixels of the pixel from the two-dimension raw data. Then, it determines whether the value of the pixel is great than a pre-determined threshold. If the value of the pixel is not greater than the pre-determined threshold, it then determines whether there is a value of the adjacent pixels is greater than the pre-determined threshold. If there is no value of the adjacent pixels greater than the pre-determined threshold, it sets the value of the pixel to a pre-determined value. Otherwise, it reserves the value of the pixel in order to increase the linearity of two-dimensional raw data so as to avoid the interference of noise to the two-dimensional raw data.

Method for improving linearity of touch system coordinates

In a sensing method using self-capacitance and mutual-capacitance alternatively to reduce touch noises, a control device configures a first driving and sensing device and a second driving and sensing device to perform an initialization. The control device configures the first and second driving and sensing devices to perform at least one self-capacitance sensing for producing a first possible touch point range during a first work mode. Then, the control device configures the first and second driving and sensing devices to perform at least one mutual-capacitance sensing for producing a second possible touch point range during a second work mode. The control device determines if there is range conjunction between the first and second possible touch point ranges. The control device produces a possible touch point range conjunction and calculates coordinates of touch points based on the possible touch point range conjunction.

Growing community of inventors

Taoyuan County, Taiwan

Shih-Hsin Huang