A Continuous-Grain Silicon-System LCD With Optical Input Function

Author

Brown, Chris J. ; Kato, Hiromi ; Maeda, Kazuhiro ; Hadwen, B.

Author_Institution

Sharp Corp., Nara

Volume

42

Issue

12

fYear

2007

Firstpage

2904

Lastpage

2912

Abstract

In this paper, we describe a continuous-grain silicon-system LCD with integrated optical input function for application in next-generation mobile devices. The optical input function, which may be used for touch input or fingerprint-recognition applications, is achieved by integrating image-sensor elements within each display pixel. By using a one-transistor (IT) active pixel sensor, we have successfully integrated a 30 Hz, 300 dpi VGA image sensor within an LCD panel with an aperture ratio of 40%. Power consumption and circuit area in the panel are minimized through the use of a source driver circuit which combines the functions of both display and sensor.

Keywords

driver circuits; image sensors; liquid crystal displays; VGA image sensor; continuous-grain silicon-system LCD; image-sensor active pixel sensor; integrated optical input function; next-generation mobile devices; optical input function; power consumption; source driver circuit; Apertures; Circuits; Energy consumption; Fingerprint recognition; Image sensors; Integrated optics; Liquid crystal displays; Optical devices; Optical sensors; Pixel; CMOS APS; image sensors; liquid crystal displays (LCDs); thin-film transistors (TFTs);

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/JSSC.2007.908695

Filename

4381439