Summary
(1) Currently thin LCD modules are obtained through edge-lit LED backlight employing low power white LEDs.
(2) LG display
established the prototype of thinnest LCD module employing edge-lit LED backlight measuring a thickness of 2.6 mm for a 42" LCD module.
(3) Potential of technology exists for thinning this to less than 2 mm.
Analysis
Edge-lit and direct-lit LED backlight for LCD has been employed by the latest LCD TV sets. Edge-lit mode lends itself for thin LCD modules and hence thin LCD TV. For example a 46" LCD module for TV with edge-lit mode of LED backlight has a thickness of less than 10 mm whereas a Direct-lit mode of LED backlight has a thickness of 46 mm. The thickness of LCD module has been gradually going down with the thickness of white LED package for the edge-lit mode. Low power (20 mA to 50 mA) white LEDs have been preferred over medium power (150 mA to 300 mA) because of thermal management issues that also has a consequence of increased thickness. It is a struggle for the side-emitting white LED package to go below 1 mm in thickness. It is only fair to say that there is going to be a limitation in thickness with low power white LED package.
The total thickness of LCD can at the best be less than 1.4 mm or 1 mm. When the thickness of backlight is added, where is the room for the total thickness of LCD module to be less than 2 mm? This is a fair question.
The potential of technology for further thinning down the LCD module exists. It can come from (i) flexible LCD and (ii) flexible backlight. Flexible TFT-LCDs have been demonstrated. Flexible TFT LCDs with flexible OLED backlight can do the job of thinning down the LCD module to even less than even 1.5 mm. Flexible OLED displays have been demonstrated. In the last CES show the concept of 'flexible notebook' has been proposed.
Flexible OLED displays have been demonstrated by Universal Display Corporation, Cambridge Display Technology, Dupont, Pioneer and Samsung. Flexible TFT LCDs have been demonstrated by Sony, Samsung, Toshiba Matsushita Display, Sharp and Epson. Flexible OLED backlight with thickness of less than 0.25 mm can be made and TFT-LCD on flexible substrate with a thick ness of less than 0.5 mm can be made. With the impressive advancement in flexible LCD technology and flexible OLED technology we can positively hope for flexible TFT-LCD with flexible OLED backlight as future generation of technology.
source : http://www.glgroup.com/News/Thinning-down-the-thinnest-LCD-module-Technology-potential-exists-45570.html
(1) Currently thin LCD modules are obtained through edge-lit LED backlight employing low power white LEDs.
(2) LG display
established the prototype of thinnest LCD module employing edge-lit LED backlight measuring a thickness of 2.6 mm for a 42" LCD module.(3) Potential of technology exists for thinning this to less than 2 mm.
Analysis
Edge-lit and direct-lit LED backlight for LCD has been employed by the latest LCD TV sets. Edge-lit mode lends itself for thin LCD modules and hence thin LCD TV. For example a 46" LCD module for TV with edge-lit mode of LED backlight has a thickness of less than 10 mm whereas a Direct-lit mode of LED backlight has a thickness of 46 mm. The thickness of LCD module has been gradually going down with the thickness of white LED package for the edge-lit mode. Low power (20 mA to 50 mA) white LEDs have been preferred over medium power (150 mA to 300 mA) because of thermal management issues that also has a consequence of increased thickness. It is a struggle for the side-emitting white LED package to go below 1 mm in thickness. It is only fair to say that there is going to be a limitation in thickness with low power white LED package.
The total thickness of LCD can at the best be less than 1.4 mm or 1 mm. When the thickness of backlight is added, where is the room for the total thickness of LCD module to be less than 2 mm? This is a fair question.
The potential of technology for further thinning down the LCD module exists. It can come from (i) flexible LCD and (ii) flexible backlight. Flexible TFT-LCDs have been demonstrated. Flexible TFT LCDs with flexible OLED backlight can do the job of thinning down the LCD module to even less than even 1.5 mm. Flexible OLED displays have been demonstrated. In the last CES show the concept of 'flexible notebook' has been proposed.
Flexible OLED displays have been demonstrated by Universal Display Corporation, Cambridge Display Technology, Dupont, Pioneer and Samsung. Flexible TFT LCDs have been demonstrated by Sony, Samsung, Toshiba Matsushita Display, Sharp and Epson. Flexible OLED backlight with thickness of less than 0.25 mm can be made and TFT-LCD on flexible substrate with a thick ness of less than 0.5 mm can be made. With the impressive advancement in flexible LCD technology and flexible OLED technology we can positively hope for flexible TFT-LCD with flexible OLED backlight as future generation of technology.
source : http://www.glgroup.com/News/Thinning-down-the-thinnest-LCD-module-Technology-potential-exists-45570.html
