The stratified thermal modules for the LCD TV with LED backlight

Abstract

There are 180 LED lamps located at the LED panel for 85W power consumption for the LED backlight. The LED lamps dissipate 68W for heat. The 32” LCD TV geometry is 800 mm(L) * 500 mm(W) * 90 mm(H). There are six light-bars on the LED panel and 30 LEDs per bar. The single LED package emits red, green and blue. For fitting the LCD TV package case, the overall thermal module size is 700 mm(L)* 400 mm(W). In order to thin the LCD TV, the fins height is designed from 20 mm to 70 mm per 10 mm. Moreover, the fins length is set as 10 mm to 25 mm by every 5 mm. The thermal modules combine several types of fin under the natural convection. The thermal module multiplies the several fins types in one. Moreover, the stratified module is separated to upper and lower regions. The stratified thermal module provides higher fins for the upper region and induced supplied air-flow by the second opening. The results represent the upper region temperature is reduced from 68°C to 58°C obviously. The cold air-flow entrains the second opening and decreases the thermal and flow boundary effect. As the results, the temperature distribution of the whole thermal module obtains more uniform pattern by stratified design. So, the stratified thermal module enhances the temperature uniformity and increases that the air-flow passes through the tunnel of the fins.