55.1: 12.1‐inch a‐Si:H TFT LCD with Embedded Touch Screen Panel

Abstract

A touch screen panel (TSP) embedded 12.1-inch LCD employing a standard a-Si:H TFT-LCD process has been successfully developed. Compared with conventional touch screen panels, which use additional components to detect touch events, the new TSP exhibits a clearer image and improved touch feeling, as well as enabling the LCD module to provide the sensing data through the driver ICs with an integrated readout function. Our new internal digital switching TSP can be fabricated with low cost because it does not require any additional components compared to a standard a-S:H TFT LCD.

A highly sensitive and low‐noise IR photosensor based on a‐SiGe as a sensing and noise filter: Toward large‐sized touch‐screen LCD panels

“…The only possible approach thus far to retain the original image quality is to incorporate sensors within the panel. [1][2][3] Among the many types of touch sensors for embedded TSPs, the photosensor has the advantages of high sensitivity without external force and of being used as an image scanner. 4,5 Especially, a-Si or low-temperature-polysilicon optical sensors were successfully embedded into small-sized LCD panels, where the photosensors were activated by either external light or a portion of the backlight reflected by touch objects.…”

32.1: Invited Paper: LCD Embedded Hybrid Touch Screen Panel Based on a‐Si:H TFT

“…However, the external TSP results in additional cost and thickness of the display module, and this problem is more severe with increasing display size. The embedded TSP can solve these issues, and for this reason embedded TSP technology has gained significant consideration for value added displays [2,3].…”

38.3: Top‐COM‐Based PLS Mode for Embedded Touch Screen Applications

“…Until now, the conventional TSP has been an external device, requiring additional components to detect touch events with a sacrifice of picture quality and increased module thickness. Thus various approaches to integrate the touch screen function into the LCD panel have been implemented, such as optical [1], capacitive [2] and digital switching sensor arrays [3]. Among several methods, the digital switching type inner TSP is a promising method because direct hand writing as well as finger touches in front of the LCD panel can be realized and its logic algorithm is simple.…”

“…However, in terms of touch sensitivity, the digital switching type TSP showed non-uniform and poor touch sensitivity. Employing a new column spacer (CS) and TFT sensor design could be a solution to overcome such limitations [4].…”