High-Speed, High-Voltage Diodes for High Resolution Monitors

In today’s multimedia orientated society, display devices used as man-to-machine interfaces to facilitate communication have become an indispensable part of daily life in both the public and industrial sectors. CRTs (cathode ray tubes) are the most widely used electric display devices because they provide a low cost, large screen, full-color image with high resolution, high brightness, and quick response. The demand for large sized CRT tubes with high resolution to display high density and large capacity graphics has increased year by year, especially in the recent field of monitors, due to the popularization of CAD, computer graphics and Windows* software. Prior to the appearance of Windows 95 software, the standard size and horizontal deflection frequency of CRTs were 14 through 15 inches and about 48kHz respectively. However, since the introduction of Windows 95, the standard size and frequency have tended to increase to 17 inches and approximately 70kHz, respectively. Furthermore, demand in the monitor market for greater than 100kHz frequency and 17 through 21-inch class CRTs will increase if device costs are reduced. In addition to personal computers, devices that can connect TVs to the internet have appeared in response to the increasing number of users who are interested in the internet. TVs larger than 20 inches in size, with horizontal deflection frequencies of 16 through 48kHz, and having the same operating frequency as standard monitors already exist and future advances are expected. The larger size and higher resolution CRT display needs operation at higher frequency and larger current for high-voltage diode to scan larger beam with higher speed. This paper outlines the high-speed, high-voltage diode ESJA18-08 for large screen and high resolution monitors, developed to satisfy such market requirements.