Current Progress in CRT Display and Discharge Lighting

We will begin our survey of present-day devices utilizing phosphors by first addressing recent improvements made in cathode-ray tubes followed by fluorescent lamps and then other lighting devices. We will then address the devices that depend upon thin film deposition for manufacture of the appliance. All of these utilize phosphors in some way for light output. 

In the last chapter, we presented a synopsis of the technological advances made in CRT s, particularly those for the color TV tube up to about the mld-1960 s. Since that time, a number of innovations have been accomplished. This change has been in response to market demand for a less bulky display device as well as a larger display size, i.e.- the flat television tube. Major improvements have been created in the electron gun, deflection yoke and the glass faceplate. What we are addressing is the changes in t rpe of display which has resulted. In the ordinary CRT of the 

we showed the typical CRT construction. What we did not state was that the maximum angle of deflection of the electron beam was about 

30° vertically. This limited the size of the image that could be generated. The market demanded larger pictures. Work on the electron gun and the deflection yoke resulted in much larger faceplates and TV pictures. This is shown in the following diagram  

Excerpted from United States Patents 5,536,995 (issued July 1996) and 5,964,364 (issued Oct. 2000- reissue 36,838- Aug. 2000), Glass Panel for a Cathode Ray Bulb Glass Bulb for a Cathode Ray and a Method of 

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