Gray shades in LCDs using Amplitude Modulation
نویسندگان
چکیده
Gray shades are essential to reproduce images on displays. Amplitude modulation technique allows a large number of gray shades to be displayed in liquid crystal displays (LCDs). Number of voltage levels in the addressing waveforms of amplitude modulation is at least twice the desired number of gray shades. Hence, hardware complexity of the column driver is high as compared to other techniques for displaying gray shades. We propose a technique to reduce hardware complexity of the column driver for amplitude modulation by about 50%. The design of a controller for amplitude modulation based on line-by-line addressing is also discussed.
منابع مشابه
11.3: Wavelets for Displaying Gray Shades in LCDs
A technique that relies on integer wavelets to deliver energy to pixels and display gray shades in rms responding matrix displays is proposed. A large number of gray shades can be displayed without flicker using simple addressing waveforms with a few voltage levels.
متن کاملModified Discrete Cosine Transform for Addressing Liquid Crystal Displays
An addressing technique that is based on modified discrete cosine transform (M-DCT) is proposed to drive RMS responding matrix displays. Time taken to switch from one arbitrary gray shade to another is almost independent of initial and final gray shades. 1. Objective and Background Discrete Cosine Transform (DCT) is capable of achieving a high energy compaction ratio and it is extensively used ...
متن کاملTechniques with low hardware complexity of the driver electronics
Temkar N. Ruckmongathan Abstract — Demand for high-quality images in mobile phones has set a new standard for displays in such portable devices. Active-matrix liquid-crystal displays (AMLCDs) are replacing passive-matrix LCDs in these applications. One of the reasons is the lack of simple techniques for displaying a large number of gray shades. The goal was to develop new addressing techniques ...
متن کاملTechniques for Reducing the Hardware Complexity and the Power Consumption of Drive Electronics
Demand for high quality images in mobile phones has set a new standard for displays in such portable devices. Active matrix liquid crystal displays (LCDs) are replacing the passive matrix LCDs in these applications. One of the reasons is the lack of simple techniques for displaying a large number of gray shades. Our goal was to develop new addressing techniques to fill this void and it has been...
متن کاملLow cost liquid crystal display optimized as a monopixel coherent modulator
We propose the use of low cost alphanumeric liquid crystal displays (LCD) not only as an educational tool, to introduce students the insights of the electrooptic performance of liquid crystals, but also as a device able to be used in research to validate models describing the performance of LCDs and to be used in applications requiring monopixel optical modulation. High resolution LCDs have usu...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2004