İleri akıllı led televizyonlarında köşeden aydınlatmalı farklı arka-ışıklandırma konseptlerinin geliştirilmesi

CCFL (Cold Cathode Florescent Lamp) based LCD (Liquid Crystal Display) TVs are replaced by Smart LED TVs with the help of recent improvements of the LED (Light Emitting Diode), electronics and information technologies. Electronics and LED improvements make connected, slimmer, fancy looking, wide color gamut, high luminance and energy efficient TV design possible. Optical design parameters are totally changed with LEDs' directional light emission. The efficacy improvement of LED chips helps decrease the number of LEDs and power consumption in the BLU (Backlight Unit) of the LED TVs. More than 50% of the TV power is consumed by the BLU. In addition to power consumption, manufacturability and cost level of TVs also highly depend on the BLU. Therefore LED structure of the TV takes a very important role in efficient TV design. The key point in decreasing the power consumption, cost level and manufacturability difficulty is decreasing the number of LEDs. In conventional BLUs, LEDs are placed at the four edges of the TV. However, the current LED placement technique has reached its limits. It is not easy to decrease the number of LEDs without any visual defect. Therefore, a new design concept should be studied. The corner placed LED (corner-lit) structure is the main focus of this study. There are optical and thermal design obstacles to overcome in this concept. The light distribution of the LEDs which are located at a specific point of the system is the most critical parameter in terms of optical design. In addition, the cooling mechanism of the high power LEDs in a small volume closure which allows only thermal conduction is the bottleneck in terms of thermal management.