1、EIA TEB23-A 81 = 3234b00 0007171 7 - 7 NOVEMBER 1981 EIA ENOINEERINQ BULLETIN NoTEB 23-A SPOT PULSE WIDTH AND REPETITION RATE IN RASTER DOT ALPHA-NUMERIC CRT PRESENTATIONS FOR RECTANGULAR PULSES FORMULATED BY EIA/TUBE ENGINEERING PANEL ADVISORY COUNCIL EIA TEB23-A 3 W 323LibOO 0007372 9 W Published
2、by ELECTRONIC INDUSTRIES ASSOCIATION Engineering Department 2001 Eye Street, N.W. Washington, D.C. 20006- Printed in U.S.A. EIA TEB23-A BL 3234b00 0007373 O TEPAC ENGINEERING BULLETIN NO. 23-A CRT APPLICATION AND REFERENCE NOTES SPOT PULSE WIDTH AND REPETITION RATE IN RASTER DOT ALPHA-NUMERIC CRT PR
3、ESENTATIONS FOR . RECTANGULAR PULSES Prepared by Frederick G. Oess Member, JT-20 Committee on Opto Electronic Devices . -1- .- EIA TEB23-A 1 m 3234600 0007174 2 m t a 3 U O w Y FJGURE 3 : NORMALIZED SPOT SHAPE .FOR FULL HIGHLIGHT LUMINANCE EQUIVALENT TO THE FULLY WRITTEN LINE . , EIA TEB23-A 81 3234
4、b00 0007180 8 Figure 4 shows what occurs at various stages of pulse reduction using a scaled spot model indicating the X and Y axes effects. II provide the same data in numerical form. dimensions of the spot in the Y direction remain constant (Gaussian with reduced amp1 itudes) while the X-axis *dim
5、ensions become narrower. Tables I and Note that the relative A I(. (I, perfectly round conditions for al 1 corresponding 1 ight level contours can only be achieved in the limit where the pulse width (T) approaches zero (Ta). zero, this, of course, represents a totally impractical Since, at this poin
6、t, the light output level would drop to approach. EIA TEB23-A 81 3234600 O007181 T I 2 .OG I 2.75 I 2.50 1 _I_ O e .Yb7t .9Y4 L! -6754 ,9594 ,9330 . E94 3 -8413 .773 - . E9 15 .5987 .5000 .4013 .3085 2266 -1587 .IO56 .O668 .O401 .O228 .o122 .O062 .o030 -0013 .o006 .o002 O G.25 0.50 0.75 I .OD 1.25 1
7、.50 y) 1.75 5 2.25 5 2-00 2.50 2.75 O, 3.00 3.25 3-50 3.75 4 .o0 4 -25 4 -50 4.75 5 .o0 5.25 5 -50 5.75 6.00 x .YI94 -.C62 .91W .e543 .8821 .BIB Academic . Press, New York, 1968. F.G. Oess, CRT Considerations for Raster Dot Alpha Numeric Presentations; Applications ? Reference Note #024, C1 inton Electronics Corp., Rockford, IL, 1979. F.G. Oess,. The Effects of Pulse Shape on Ra.ster Dot Alpha Numeric CRT Presentations; Applications & Reference Note #001A, C1 inton Electronics Corp. , Rockford, IL,. 1980.
