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Research On The Key Techologies Of Large-Area Full-Color Display System With All-Solid-State Lasers

Posted on:2005-01-05Degree:DoctorType:Dissertation
Country:ChinaCandidate:J G HuFull Text:PDF
GTID:1118360152980030Subject:Physical Electronics
Abstract/Summary:PDF Full Text Request
Laser Display Technology (LDT) is one of the most promising technologies forlarge area (or screen) display. Due to the unique advantages of RGB laser, such as,monochromatic,small divergence, high brightness, etc, LDT has many advantages.The greater spatial coherence results in greater depth of focus, permitting projectionon curved surfaces, high resolution, high definition, greater pixel contrast. Themonochromatic nature of laser light results in brilliant, saturated colors and greateroptical efficiency. Diode-pumped all- solid-state LDT offers number advantages overtheir lamp-based counterparts. Their advantages result in LDT's long lifetimes (inexcess of 10,000 hours), low power consumption, compact structure, small bulk andeasy operation. This dissertation has made systematic researches on the key technologies oflarge display area LDT. The main contents are as follows:1. Comparing to other display technologies, the main advantages of LDT were introduced as well as its developments;2. The polygonal mirror scanning system is designed and made for PAL standard TV signal with aluminum alloy, together with a galvanometric mirror. The system can scan 2-dimensions video signal. The polygon facets number is 40, radius is 40mm, rotation speed is 390.625rps ,the reflection rate of polygonal mirror surface is 85%. The stable gratings scanning was realized;3. An analysis solution was obtained for scanning velocity of laser point on preobjective mirror of polygon-mirror scanning system. The nonlinearity, asymmetry and subsequent image aberration are attributed to the intrinsic structure of the scanning system. A numerical calculation was made to demonstrate that there is about 6m? s?1 difference between the maximum and minimum scanning speed during a horizontal scanning. The time symmetry center is changed from 32μs to 30.7477μs;4. The main methods of laser intensity modulation were summarized briefly. The red, green and blue (RGB) laser acoustic-optical modulators were made with transparent glass SF-10. Their diffraction efficiency is over 74%. The carrier frequency is 150MHz, modulation frequency is 10MHz, and output power is 15W;5. The video signal buffer storage and control system was designed and made. The signal type is VGA or DVI from PC. Three 512K FIFOs (First-In First-Out) storages were used as buffer storages for RGB date streams. The synchronization between the scanner and PC video signal was realized.6. The chromatic problem in display system was discussed, including color's basic characters, human's resolving power of color, the color mixing theory and the transformation of three primary colors. The ratio of three primary color's brightness and power to obtain white balance color was calculated to be Lr : Lg : Lb = 0.25:0.72:0.05 and PR: PG: PB = 0.865 : 0.816 : 0.794, respectively;7. The development of RGB laser and the technologies of mode-locked laser were summarized. 118.345MHz high repetition rate mode-locked laser was realized. The structure and SHG properties of a new nonlinear optical (NLO) borate crystal BiB3O6 (BIBO) were introduced briefly. Its main advantages include high effective NLO coefficient (deff ), broad transmission band, stable physical and chemical properties, non-hygroscopy etc. 2.2W green laser was gained with intracavity frequency doubled Nd:YAG/BIBO laser. A RGB laser system was designed with double oscillation resonant (DOR) following with two SHGs, and over 40W green beam was gained, red, blue laser was gained with low repetition rate.
Keywords/Search Tags:laser display technology, large area display, full color, all-solid state laser, RGB laser, frequency-conversion, three primary colors, white balance, scanning system, video signal buffer storage system
PDF Full Text Request
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