| 摘要 |
PURPOSE: A cathode-ray tube having an electron beam controller is provided to reduce a black brightness and to improve a dark contrast by determining precisely the positions of electron beams. CONSTITUTION: Detection strips(12,13) each comprising a semiconductor component are provided on a front plate(10) of glass. The semiconductor component is preferably a pn diode which is formed by a first electrode(15), an n-conductivity layer(16), a p-conductivity layer(17), and a second electrode(18). The first electrode(15) and the second electrode(18) are made of a metal, an alloy, a conductive oxide, or combinations of these materials. Each detection strip(12,13) preferably have a trapezoidal cross-sectional shape, that side of a detection strip(12,13) which adjoins the front plate(10) being narrower than the side facing an electron gun. In this arrangement, the high-energy electrons of the electron ray are absorbed in the pn junction of the semiconductor component and generate a large number of charge carriers there. The light generated in a phosphor layer(11) is absorbed by the semiconductor component. This results in an additional photocurrent which further strengthens the current signal of the detection strips(12,13).
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