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OLED display

Edit: Shaoxing Xinshan Science Technology Co.,Ltd   Date:Apr 12, 2017

Has a mechanical and electrical excitation light diode because have illuminated at the same time, do not need to back light, high contrast, thin thickness, wide Angle, fast response speed, can be used in the flexural panel, using temperature range, structure and process is relatively simple, unique features, is considered to be the next generation of emerging application of flat panel display technology.

Light emitting diode (OLED) display is becoming more common, in mobile phones, media players and small entry-level TV and other products of the most significant. Different from the standard LCD, OLED pixel is driven by a current source. If you want to understand how and why the OLED power supply will affect the display quality, must first understand the OLED display technology and the power supply requirements. This article describes the latest OLED display technology, and discusses the main power supply requirements and solutions, and also introduced specifically for OLED power supply demand and puts forward the innovative power supply architecture.

Backplane technology make flexible display High-resolution color (AMOLED) active matrix organic light emitting diode display need to adopt active matrix backboard, the backplane use active switch switch for each pixel. Liquid crystal (LC) display amorphous silicon process has become mature, can supply low cost of active matrix backboard, and can be used in OLED. Many companies are in view of the development of flexible display organic thin-film transistor (OTFT) back process, this process can also be used for OLED display, in order to realize full color displays on the launch. Whether standard or flexible OLED, are need use the same power supply and drive technology. If you want to understand the OLED technology, functions and interactions with the power supply, must analyze the technology itself. OLED display is a kind of self light-emitting display technology, completely don't need any backlight. OLED used material included in the chemical structure of organic material. OLED technology needs to drive current control method OLED with standard electrical characteristics of light-emitting diode (LED) is quite similar, brightness all depends on the LED current. If you want to open and close the OLED and control OLED current, you need to use thin film transistor (TFT) control circuit.

Advanced energy-saving model can achieve the highest efficiency and any a battery-powered device, only in the converter load current as a whole range of highest efficiency during operation, to achieve a longer battery life, this is especially important for OLED displays. OLED display to present all white when consumed the largest power supply, the current is relatively small, for any other display color only white need all this is because the red, green, and blue pixels are all bright. 2.7 -inch screen, for example, need 80 ma current to render all white images, but only need 5 ma current display other ICONS or graphics. Therefore, OLED power supply needs for all load current to achieve high efficiency of converter. In order to achieve such efficiency, need with the model of advanced energy saving technology to reduce the load current, in order to reduce the converter switching frequency. Because this is done through the voltage controlled oscillator (VCO), can therefore will be possible to minimize EMI problem, and to maintain the minimum switching frequency control in general from 40 KHZ range, it can avoid ceramic produce noise input or output capacitance. Use the devices in the mobile application, it is particularly important, and can simplify the design process.

White light is not use by luminescence properties, is to determine the power consumption of brightness values. Such as red, blue, green with bright brightness value is 10 will produce 30 brightness values of white light. So will be red, blue, green synthesis of brightness value to 3.3 a white light value of 10 (theoretical). From the human eye to see the same brightness leds or OLED, blue light power consumption is the largest.


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