Over the past four - five monochrome (STN) liquid crystal displays were the primary solution used in mobile phones and handheld computers (PDAs). However, due to the constant expansion of the functionality of these devices and the increased demands on their displays. The abrupt transition PDAs and cell phones from monochrome to color display not only provide a wealth of opportunities for manufacturers, but also caused a fierce competition of technologies used in the production of matrix screens for the market of portable devices.
Key decisions to date, claiming to be the market leader in color displays, this display, technology CSTN, and active matrix display (AMLCD) - as TFT (Thin Film Transistor), and LTPS (Low - temperature Polysilicon). Which technology will win in the market and become the most common, depending on the device that will use the panel on the size of the panels permits and, most importantly, the price of the panel.
Equipping mobile phones colored panels began two years ago in Japan. Ratio color screens for mobile phones was based on the total number of issued for phones panels 2001, only 12%. By 2004, almost 50% of all mobile phones will have a color screen. And 30% of this amount - LCD - panels, created by technology CSTN.
The main cause of high rates of introduction of color screens for phones - a rapid decline in prices for LCD - displays. In 2001, as CSTN, and TFT - panels fell by 25%. As for the PDA, then 46% of all handhelds in the past year has been equipped with color displays, and in 2006 this figure could rise to 72 - 75%. In 2004 - inch LCD screen with an active matrix will be installed in 50% of the CPC. Growth rate of sales PDAs equipped with color displays, not least due to the proliferation of operating system Pocket PC. Screen resolution CCP working in this OS, 320 x 240 pixels. CSTN - screens can not support such a resolution by virtue of their physical size, however, their popularity is falling, despite the fact that they are up to 60% cheaper than the TFT - model.
In the sector of one-inch screens, the price difference between the two types of panels depends on the size of the screen and the size of the pixel. Many manufacturers, by the way, skillfully use this price difference and equip CSTN - mobile phone screen of the lower and middle levels, or use them as external displays the phone - "clamshells". As for the two-inch screens, the difference in price and TST CSTN - panels made at the beginning of this year, 60% (about $ 10). However, by the middle of next year, this difference was reduced to 40%. Thus, the market for color displays for mobile phones with a resolution of 65 thousand. Pixels and a screen size of less than two inches clear leader is CSTN - screens. For phones with multimedia capabilities and full - color screens larger than two inches of the optimal solution is TFT - panel.
It is worth mentioning one more technology that is beginning to be used in the market for mobile phone screens - OLED. In 2002, the OLED - passive matrix displays (as the secondary display) were equipped with 3.7 million. Phones. In 2003, plans to sell about 10 million. Panels for additional displays and 3 million. Main panel displays. According to analysts, monochrome OLED - Display decreasing use of monochrome LCD - displays will be used less and less. In the coming years, most of the additional OLED - Display will be colored with a passive matrix. Screens on the market with an active matrix OLED - Display can act only in the sector of luxury high - end phones - of - the high price. In 2004, the average price of two-inch OLED - active matrix panel is not less than $ 45. Needless to say that even for a cell phone price range $ 230 - 250 a display, whatever quality it may be, is too expensive solution.
Key decisions to date, claiming to be the market leader in color displays, this display, technology CSTN, and active matrix display (AMLCD) - as TFT (Thin Film Transistor), and LTPS (Low - temperature Polysilicon). Which technology will win in the market and become the most common, depending on the device that will use the panel on the size of the panels permits and, most importantly, the price of the panel.
Equipping mobile phones colored panels began two years ago in Japan. Ratio color screens for mobile phones was based on the total number of issued for phones panels 2001, only 12%. By 2004, almost 50% of all mobile phones will have a color screen. And 30% of this amount - LCD - panels, created by technology CSTN.
The main cause of high rates of introduction of color screens for phones - a rapid decline in prices for LCD - displays. In 2001, as CSTN, and TFT - panels fell by 25%. As for the PDA, then 46% of all handhelds in the past year has been equipped with color displays, and in 2006 this figure could rise to 72 - 75%. In 2004 - inch LCD screen with an active matrix will be installed in 50% of the CPC. Growth rate of sales PDAs equipped with color displays, not least due to the proliferation of operating system Pocket PC. Screen resolution CCP working in this OS, 320 x 240 pixels. CSTN - screens can not support such a resolution by virtue of their physical size, however, their popularity is falling, despite the fact that they are up to 60% cheaper than the TFT - model.
In the sector of one-inch screens, the price difference between the two types of panels depends on the size of the screen and the size of the pixel. Many manufacturers, by the way, skillfully use this price difference and equip CSTN - mobile phone screen of the lower and middle levels, or use them as external displays the phone - "clamshells". As for the two-inch screens, the difference in price and TST CSTN - panels made at the beginning of this year, 60% (about $ 10). However, by the middle of next year, this difference was reduced to 40%. Thus, the market for color displays for mobile phones with a resolution of 65 thousand. Pixels and a screen size of less than two inches clear leader is CSTN - screens. For phones with multimedia capabilities and full - color screens larger than two inches of the optimal solution is TFT - panel.
It is worth mentioning one more technology that is beginning to be used in the market for mobile phone screens - OLED. In 2002, the OLED - passive matrix displays (as the secondary display) were equipped with 3.7 million. Phones. In 2003, plans to sell about 10 million. Panels for additional displays and 3 million. Main panel displays. According to analysts, monochrome OLED - Display decreasing use of monochrome LCD - displays will be used less and less. In the coming years, most of the additional OLED - Display will be colored with a passive matrix. Screens on the market with an active matrix OLED - Display can act only in the sector of luxury high - end phones - of - the high price. In 2004, the average price of two-inch OLED - active matrix panel is not less than $ 45. Needless to say that even for a cell phone price range $ 230 - 250 a display, whatever quality it may be, is too expensive solution.
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