Patent approved: a hybrid CRT design for advanced TV and other large-format digital displays

摘要

Abstract: A patent has been awarded for a new CRT design thateliminates the internal shadow mask, and promises abright, rugged, high-resolution/large-format,multiscan/multi-sync display with potentially lowmanufacturing costs. The design incorporates alight-valve within the CRT. Modulation of the electrongun and the function of the shadow mask are replaced bytwo chemical reactions typical of phosphors: decaysstimulation and quenching. These reactions arecontrolled through illumination of the phosphors bynon- visible light projected through the light-valve.The image is generated in traditional raster form, butwith a single, non-modulated electron gun; control ofeach pixel is made through modulation of thelight-valve. The design decrease manufacturingalignment requirements and eliminates the need to focusthe electron gun. Advantages include: high-G resistancedue to elimination of the shadow mask; brighterdisplays because the electron beam is not occluded orabsorbed by the shadow mask; elimination of decay rateas a parameter in phosphor choice and frame rate; anddigital interfacing to image sources. Applicationsinclude: large- format displays without the physicalconstraints of the shadow mask and by elimination ofdistortion control requirements of the electron beam atthe image edges; variable frame rates by modulating thedecay rate of the phosphors through quenching; andstereoscopic displays without crosstalk through controlof left-right phosphor decay rates. !7