The AMOLED TFT Display Module power IC Overview

OLED classes and characteristics
OLED screen is divided into a passive matrix (PMOLED) and active matrix (AMOLED) two types. The PMOLED monitor lower cost, easier to manufacture. However, the resolution and screen update frequency is restricted. Most of today OLED display passive matrix and active matrix display has gradually accelerated growth trend. High color saturation, thin volume, high contrast, fast response time and low power consumption and other characteristics, it is the factors that contributed to this trend.Graphic LCD Module
The PMOLED only need positive voltage to power supply the ranks the drive VOH_r VOH_c required. The boost converter is able to supply the PMOLED monitor the desired boost, but AMOLED display has fast switching TFT matrix, it is possible to control the OLED. To drive AMOLED display OLED, need positive and negative voltage.
AMOLED requires less current and lower voltage. In fact, for the same size PMOLED display, only need to supply low a power series (imagine the difference in the number of each column microwatts and milliwatts). Front design will search the IC manufacturer's Web site, trying to figure out the OLED display powered device, but only a few devices suitable. These devices are particularly marked "suitable for the use of OLED supply. In order to supply to the AMOLED need the right IC power level is correct, and minimize the negative and positive voltage of the external circuit.serial display modules
Need a new generation of power IC
The AMOLED display continuous development requires a new generation of power ICs. Some IC will be controlled using two separate power supply circuit of the two inductors, in order to meet the demand for the positive electrode and the negative electrode voltage.
Using a single independent inductor multiple-output converter, you can achieve a smaller solution size, the fewer the number of components, and lower design costs. Through relatively closely matched to the load current between the positive electrode and the negative electrode voltage, the two ends of the inductor can be used to provide two after adjusting electrode. To the TI TPS65136 converter used, for example, single inductor multiple-output converter helps AMOLED display to achieve high quality performance. Wherein only through a 2.2μH inductor, will be able to operate in a buck-boost topology, to produce the positive electrode and the negative output voltage. This technique is also able to achieve an excellent line pressure and load regulation, it is possible to avoid the display of the mobile phone during signal transmission interference.
In order to maintain the high efficiency of the entire load current range, the converter will reduce the switching frequency when the load current is decreased. Frequency is too low, the converter will be issued to the vibration of the ceramic output capacitor audible noise. TPS65136 uses voltage controlled oscillator (VCO) switching frequency remain above issue audible noise range, thus avoiding the occurrence of such situations. Using small AMOLED display device, such as mobile phones and portable media player, which is particularly important.
Today, AMOLED panel and system integrators are turning to the second and third generation product development. Mobile phones and portable media players will promote mass production to achieve economies of scale and the benefit of other devices. On the development of these industries in highlights the importance of the evolution of the power IC and elimination monitor the operation and innovation.