In-cell multi-touch I display panel system

Abstract

An in-cell multi-touch display panel system includes a multi-touch LCD display panel and a touch display control subsystem. The multi-touch LCD display panel has a TFT layer, a detection electrode layer, and a common-voltage and touch-driving layer. The detection electrode layer has M first conductor lines for performing touch detection by sampling touch detection from the M first conductor lines. The common-voltage and touch-driving layer has N second conductor lines for receiving common voltage in display and touch-driving signal in touch detection. In the detection electrode layer, there are pluralities of detection electrode areas in the intersections of first conductor lines and second conductor lines. Each detection electrode area is connected to a first conductor line by a touch-control transistor. The M×N touch-control transistors are divided in to N sets corresponding to N second conductor lines respectively.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to the technical field of touch panels and, more particularly, to an in-cell multi-touch display panel system.[0003]2. Description of Related Art[0004]The principle of touch panels is based on different sensing manners to detect a voltage, current, acoustic wave, or infrared to thereby detect the coordinate of a touch point on a screen as touched by a finger or other medium. For example, a resistive touch panel uses a potential difference between the upper and lower electrodes to compute the position of a pressed point for detecting the location of the touch point, and a capacitive touch panel uses a capacitance change generated in an electrostatic combination of the arranged transparent electrodes with the touching part of a human body to generate a current or voltage for detecting the coordinate of the touching part.[0005]Upon the principle, the capacitive touch technologies can be divide...

AI Technical Summary

Benefits of technology

The present invention provides an in-cell multi-touch display panel system that can improve resolution without adding cost. The system shares the same transparent conductive layer in driving of the common voltage layer and touch detection devices of an LCD panel. This saves money and allows for improved performance.

Problems solved by technology

The surface capacitive sensing has a simple configuration, so that the multi-touch implementation is not easy, and the problems of electromagnetic disturbance (EMI) and noises are difficult to be overcome.

However, such a self capacitance sensing also has the disadvantages as follows:

(1) When there is a floating conductor, such as a water drop, an oil stain, and the like, on the touch panel, it causes an error decision on a touch point.

(2) When there are multiple touch points concurrently on the touch panel, it causes a ghost point effect, so that such a self capacitance sensing cannot be used in multi-touch applications.

However, such a way requires an increase of the weight of the touch panel due to the stack resulting in relatively increasing the weight of the flat display, which cannot meet with the requirement of compactness in current markets.

Furthermore, when the touch panel and flat display are stacked directly, the increased thickness reduces the transmittance of rays and increases the reflectivity and haziness, resulting in greatly reducing the display quality of the screen.

However, it is increasingly difficult to perform the image displaying and touch sensing in 16.6 ms due to the higher and higher resolution of the display panel.

Therefore, the increasing image resolution is limited.

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