The Developing Of Resonant Microcavity Phosphor In Large CRT Project Displays

Along with fast development of the electronic and display technologies, the large screen and high resolution TVs have been the main trend of the TV industry. CRT (Cathode Ray Tube) projection TVs is becoming the main product and the research of the field is still one of the hot topics. In the traditional CRT projection displays, the phosphor screen mostly is fabricated by depositing phosphor powder on the glass substrate. The phosphor emits light freely and its emission spectrum is quite broad. The wavelength bandwidth for the 50% of the peak emission is about 100nm and the luminance is distributed according to the rule of Lambertion cosine of angle. So the primary color is not pure and direction of image light is not good, which causes the poor color saturation and low brightness and resolution of projection display. Therefore we propose a new phosphor screen based on optical resonant microcavity. The phosphor layer is placed in a resonant microcavity, which consists of two multi-layer dielectric mirrors. The resonant microcavity actively controls the energy mode intensity of the luminescence, and the emission spectrum is in the desired narrow wavelength bandwidth and the angle is small.The paper summarized the basic theory of optical resonant microcavity and the thin film optics, and studied the designing and fabrication of the resonant microcavity phosphor screen.