Lighttools kullanarak lcd tv arkaışık üniteleri için lgp (ışık kılavuzu plaka) patern tasarımı

The light guide plates and their pattern play a critical role on the brightness and the uniformity of the back light unit hence the liquid display panel. The scope of this study is to design a dot pattern that will increase the uniformity and the brightness of the back light unit to a level that will allow discarding more expensive films such as reflective polarizers. To achieve this purpose an LGP pattern was designed by using an optical simulation tool (Light Tools), the resulting plate was produced and the results with the real measurements were compared against simulation. The results showed significant improvement over existing LGPs. The system studied in this work incorporated a 39" panel with 52 LED placed at the short edge of the back light unit. The uniformity target was 75% (VESA) from 1/6 of the active area and the brightness target was 300 nits. Optical stack was aimed to be DBEF free and the power classification target was A+. The initial parameters resulted in a distribution of ~61% uniformity, but this trial served as a starting point to compare the dot's optical parameters with the real world results leading to optimum parameterization. After which, the design results were much closer to production results. The final design achieved the minimal targeted specifications of 300 nits (338 nits) and 75% (76.63%) uniformity. Simulating the light guide plate's dot pattern and testing many pattern distributions saved both time and money compared to producing all of them.