Application of OLED driver and module design in mobile phone screen

Ten years after the discovery of the electroluminescence mechanism, organic light-emitting diode ( OLED ) technology was eventually commercialized in mobile phones, MP3 and digital cameras. According to the data report of Display Search, from the first single-chip OLED driver in 2001, more than 17 million ICs were used in mobile phone displays in 2003. This year, OLEDs have also been applied to the main display of mobile phones. The application of OLED in mobile phone display is making rapid growth. It is expected that the number of OLED modules used will exceed 30 million this year.

In response to OLED technology and development, OLED drivers are also playing an increasingly important role. Not only from low duty cycle rise to support high duty cycle, but also applications such as control of each RGB current, wider IC operating temperature (-45 to 80 °C), internal DC-DC boost, and graphics acceleration Some features such as instructions. Solomon Systech's OLED drivers have all of these features, increasing the lifetime and reliability of OLEDs and enhancing the display of OLEDs.

Mobile phone common display resolution secondary screen

There are generally three display resolutions on the mobile phone's secondary screen: 80x48, 96x64, and 96x96. In 2003, the main color of the OLED is applied to the secondary screen of the mobile phone. This is a single display type with two or three colors. . It has proven to be a good choice for use on the secondary screen of mobile phones. In the future, regional color OLEDs will be used on low-cost mobile phones, while full-color OLED secondary screens will be used in high-end products such as mobile phones with cameras, 3G mobile phones and smart PDA phones.

Main screen

There are many display resolutions for the main screen of the phone, from 96x64 to 640x320. On some straight machines, 96x65, 101x80 display resolution is more common; on the folding machine, it is mostly 128x128 display; while 132x176, 176x220 is used in many folding machines and camera phones; 320x240 is used for 3G mobile phones.

This year, the first mobile phone with OLED main screen appeared in China, and this technology, including the driver IC, is fully commercial. More and more mobile phone manufacturers are considering adopting OLED main display, and some of them have added this technology to new products. In the near future, OLED will be an important member of the main display of mobile phones.

OLED Driver and Module Design Compared to LCD modules, self-illuminating OLED displays do not require backlighting and LED driver circuitry. Typical OLED modules are only 1 to 1.5 mm thick, while LCD modules are typically 3 mm thick. Therefore, the OLED module is suitable for an ultra-thin flip cover applied to a folding machine.

A highly integrated OLED driver/controller IC with row, column driver, DC-DC conversion, timing control, display memory and MCU interface circuitry provides a simple solution for OLED module manufacturers to use on mobile devices. Not only that, but software engineers can also save time in mobile development by using built-in graphics controller functionality (see Figure 1).

Save time on mobile development by using built-in graphics controller features

As the duty cycle of display resolution increases, the difficulty of using passive matrix OLEDs and the requirements for the technology are also higher. Therefore, some OLED module manufacturers intentionally adopt active matrix OLEDs on displays with a duty ratio greater than 132. This is somewhat the case with STN and TFT encountered in LCD technology. One speculates that future large-size displays will take into account the quality of the display and the size of the screen, which will be dominated by active matrix OLEDs (AMOLEDs), while low duty cycle displays will be passive matrix OLEDs for cost and flexibility reasons ( Occupied by PMOLED). However, most of the current AMOLED products are still in the laboratory stage and have not yet been fully commercialized. Manufacturers of PMOLEDs are also working hard to produce larger size and higher duty cycle products, and try to share the huge market of mobile phones with STN LCD and TFT LCD.

Although PMOLED has some technical problems in high duty cycle applications, it can be solved by a suitable driver IC to achieve high duty cycle display. For example, driving two split screens with a driver IC that supports cascading can double an 88x176 display to 132RGBx176 (as shown in Figure 2). In order to achieve this solution, the driver IC needs to have the following functions: (a) different from LCD driver, current drive technology is required; (b) high data transfer rate and high power consumption for full-color applications, data memory and control functions, gray The meter and power saving modes need to be integrated in the IC, which also helps the life and reliability of the OLED; (c) In order to reduce external components and save costs, an internal power control system is required. With these technologies and features, PMOLED will be easier to enter the arena of the full-color home screen of mobile phones.


Double an 88x176 display to 132RGBx176

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