60.2: Invited Paper: Advanced In‐cell Touch Technology for Large Sized Liquid Crystal Displays

Abstract

We propose an advanced in-cell touch (AIT) sensor integrated on TFT substrate. The proposed touch sensor perceives selfcapacitance formed between touching object and sensing electrode which is made by common electrode of AH-IPS panel. This new touch sensor shows above 50dB-signal-to-noise ratio and multi-touch function without loss of transmittance. Finally we have succeeded in in-cell touch panel development of 15.6" FHD for notebook PC and 7" WVGA for automotive which supports 2mm-thick glove touch.

46-1:Invited Paper: Touch and Display Integration with Force

“…There have been several previous styles of In-Cell and successful integrations with different In-Cell architectures [3] [4]. Many measure the mutual-capacitance between transmitter electrodes and receiver electrodes, but integrating touch connections allows self-capacitance techniques.…”

69‐2: Overcoming an Abnormal Horizontal Dim Lines of an In‐cell Touch Display

“…A display frame rate of conventional LCDs is 60Hz while a reporting rate of the touch panel is required above 100Hz [1].To meet the requirement, we designed a time division multiplexing (TDM) driving scheme. TDM is a method of dividing a frame time into a display fraction and a touch fraction so that each signal appears in an alternating pattern as we shown in Fig.…”

Robust integrated shift register circuit over clock noises for in‐cell touch applications

“…However, this integration leads to serious crosstalk between display and touch signals, where the degradation on displayed images and touch performance takes place due to their small gaps. To cope with this crosstalk artifact while increasing the touch reporting rate, an in‐cell touch panel conducts touch sensing and displays scanning operations separately based on a time division driving method (TDDM) . In addition, the overall cost of display manufacturing is further reduced by implementing gate driver circuits with thin film transistors (TFTs) on a panel .…”

“…To cope with this crosstalk artifact while increasing the touch reporting rate, an in-cell touch panel conducts touch sensing and displays scanning operations separately based on a time division driving method (TDDM). 6 In addition, the overall cost of display manufacturing is further reduced by implementing gate driver circuits with thin film transistors (TFTs) on a panel. [7][8][9][10][11][12][13][14] In the TDDM, the display area is divided into several blocks in between which touches are detected.…”