45.1: Touch Panel Embedded IPS‐LCD with Parasitic Current Reduction Technique

Abstract

A capacitive-type touch-panel-embedded IPS-LCD is realized by a novel parasitic current reduction technique (PCR). The PCR removes 90% of the current flowing through the parasitic capacitance on a capacitive sensor (ITO layer) formed on a color filter substrate. Since the IPS-LCD has the same structure as commercial products, it features no reduction in aperture ratio.

Electromagnetic field analysis of capacitive touch panels

“…There have been considerable efforts of late to combine PCT panels and flat-panel displays, which is called the "oncell" [22,23] and "in-cell" structure [24][25][26][27][28], to simplify the structure of the touch panel. Research to solve issues [29][30][31][32][33][34][35][36] such as low signal-to-noise ratio and high cost, and to develop a 3D gesture and stylus input, is actively being pursued worldwide.…”

P‐139: A New Pixel Design for Touch and Display Driver Integration (TDDI)†

“…The three R/G/B sub-pixel parasitic capacitance is inhomogeneity when Tx line was placed at one or two sub-pixels of each Pixel, because the touch line interferes with the parasitic capacitance between the pixel electrode and the data line. Inhomogeneity of parasitic capacitance cause poor color uniformity on the Entire screen [1][2][3] . In addition, the Tx line occupies part of the pixel area, resulting in the actual R/G/B sub-pixel size smaller than the non TDDI design, the pixel aperture rate will also decrease.…”

P.45: The Study of LCD Module Assembly Mura

“…• On-cell: The touch sensor is an X-Y array of capacitive electrodes deposited on the top or bottom surface of the color filter substrate [6][7].…”