Abstract
Our daily activity is supported with information stored in tiny tips in computers that are invisible by the naked eyes. The stored information of PC and TV broadcasting images displays on lighted phosphor screens. Comfortable images on the phosphor screens for the naked eyes should be equivalent with the daytime scenery under slightly overcastting sky {10 <sup>25</sup> visible photons (m<sup>2</sup>, s) <sup>-1</sup>} that the eyes have adjusted for 5 million years. We have developed the CRTs that display the required images on the phosphor screen as the consequence of the statistical study on the sizes of the phosphor particles. Phosphor screens in CRT are constructed with the polycrystalline phosphor particles in the size at around 5 x 10<sup>-6</sup> m. The phosphor powder in 1 gram contains 3 x 10<sup>20</sup> particles that should distribute with a log-normal distribution. Then, we have significantly increased the luminance to 100 ft-L (equivalent to 330 lumens m<sup>-2</sup>) from 7 ft-L by the change in the operation conditions of the phosphor particles after the measurements of the VD and CD curves of CL. The sharp and stable images on the lighted phosphor screen in CRTs are only obtained with the phosphor particles that have the clean surface chemically and physically.
Highlights
The stored information of personal computers (PC) and TV broadcasting images displays on lighted phosphor screens
When we had involved the phosphor screens of color CRT on 1950s, the color phosphor screens in CRT had the luminance at 7 ft-L, corresponding to the illuminance (10 lm, m-2) of the luminance (10 cd, m-2) that is less than one tenth of the required luminance (330 cd, m-2)
The phosphor screens are constructed with the polycrystalline particles that distribute in the sizes at around 5 x 10-6 m
Summary
Human history backs to 5 million years. Our life activity is based on the historical results of the 5 million years. Many scientists and engineers have studied the phosphor screens with the commercial phosphor powders of the CRT for more than 100 years. The produced phosphor particles in the crucibles are sintered with the solidified by-products that cover on the surface of the crystallized phosphor particles. A kind of the know-how is the surface treatment of the phosphor powders They never discussed about the statistics of the sizes of the huge numbers of the phosphor particles. It had empirically found that the amount of the water by the capillary condensation at the contact gaps between the phosphor particles is significantly reduced by the coating of some amount of the SiO2 gels (microclusters) on the surface of the phosphor particles. The details of the charge-up of the SiO2 microclusters will describe later in this report
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