A range of the reproducible color, i.e., color gamut, of the conventional display devices such as CRTs (cathode ray tubes) and LCDs (liquid crystal displays) is sometimes insufficient for reproducing the natural color of an object through color imaging systems. In this paper, a six-primary color display is developed to reproduce the expanded color gamut, by using two conventional RGB projectors...

In electron beam devices, the voltage applied to the cathode (w.r.t. grid voltage) provides the initial energy for the electrons. Based on the type of electron emission, the electron sources are (mainly) classified into thermionic cathodes and cold cathodes. The power consumption of a cold cathode is smaller than that of a thermionic cathode. The delay time of the electron emission from a cold ...

In 1895, the German physicist, Wilhelm Conrad Röntgen (1845-1923), who was 50 years old by then, studied cathode rays with Crookes tubes. He was more precisely concerned with the penetration of the rays through the glass. At the time, it had already been established that cathode rays could pass through the tube wall and penetrate a few centimetres in the air. In the evening of November 8, durin...

This paper presents an alternative way to recycle cathode ray tube glass waste, together with fly ash and kaolin, into new ceramic materials. The samples were obtained using three firing temperatures: 700, 800, 900 °C. effect of the ash/CRT waste ratio upon materials’ shrinkage, apparent density, total porosity, chemical stability, compression strength was investigated. shrinkage used as a dime...

A self-focusing field emission (FE) X-ray tube with a large-area cathode design was simulated and fabricated. The designed X-ray tube had a cylindrically symmetric geometry; the diameter of the cathode and the anode was 15 mm, and the cathode-anode distance was 20 mm. Owing to the unique cup-shaped design of the cathode, the electron beam emitted from the large-area cathode was focused onto the...

Liquid crystal displays had a humble beginning with wrist watches in the seventies. Continued research and development in this multi-disciplinary field have resulted in displays with increased size and complexity. After three decades of growth in performance, LCDs now offer a formidable challenge to the cathode ray tubes (CRT). A major contribution to the growth of LCD technology has come from ...

The color reproduction characteristics of LCD (liquid crystal display) panels are different from those of CRT (cathode ray tube) displays. This paper describes how the authors measured and analyzed such characteristics of LCD panels to develop new methods for compensating the bluish cast found on conventional LCDs. The first one is a hardware-based technique that employs a LUT (look-up table) a...

This paper presents a method and a system for deflection yoke tuning to correct the misconvergence of colours of a cathode ray tube. The misconvergence of colours is characterised by 18 distances measured between the primary colour beam traces of the same picture element. The vision system grabs the picture at nine control positions and the computer calculates the distances between the colours....