| Currently LCD has developed into mainstream of panel display flattechnology. Faced with increasingly fierce competitive situation, flat paneldisplay products must be: low cost, high picture quality, energy saving andenvironmental protection, thin appearance, larger and other requirements,enterprises can better survive. LED because of its many advantages: long life,energy saving, light having directivity and small volume, are gradually replacingthe traditional light source used in a wide variety of LCD products. The small sizeof the flat panel display products continue to be eroded in the case OLEDproducts to accelerate the pace of development of early occupation of large-sizeLED LCD TV market, to extend the LCD industry life cycle, as each showenterprise product development imperative. The purpose of this project is todevelop a large-size LCD TV backlight for improving the core competitiveness ofenterprises, has very important significance. The main content of the subject is todevelop a large-size LED LCD backlight module, and to ensure its optical andthermal properties.First, the completion of the backlight module optical design. Use Light Toolssoftware, according to the chosen LED sizes, in the software build LED singlelamp3D models. And simulation of LED Lighting learning maps, and controlsmanufacturers specifications, indicating LED single lamp simulation results areconsistent with the actual situation. Established backlight design model, given bythe manufacturer or the actual test parameters input to the model, solve andoptimize the optical effect, determine a reasonable distance of mixed light, makesure to select a reasonably low reflection plate edge angle. According to theparameters given optical simulation carried out backlight structure design and abacklight assembly and testing samples. The results show that the results ofoptical simulation predicted results are basically consistent with the test.Then, according to the structural design drawings backlight thermal modelwas established and carried out the solution process. And after the trip operation,the cumulative iterative calculation, each monitoring point LED junctiontemperature curve tends to level, convergence is better. But the first results showthat the LED light board surface temperature exceeds the design value exists relatively large security risk. Then, after the shell is added between the heat sink,and again simulation calculation results show that the conditions of operationafter the heat sink, LED maximum surface temperature can meet the designrequirements.Finally, the use of infrared camera on the assembly line of the sample wascompleted thermal test, indicating that the backlight module to stabilize the workand meet the design requirements.This topic more satisfactory completion of various design tasks, andeventually the TV sample were shown in the exhibition. Achieved good socialeffects, with the advance of mass production that the product can produce bettereconomic benefits for enterprises. |
