Technical development trend and application analysis of dot matrix LED driver

In an environment where global competition such as mobile phones and household appliances is intensifying global competition, personalization of design has become an important factor. Therefore, the design and display methods created by various types of devices have been adopted, especially recently, with the development of LED miniaturization and thinning, various display parts of electronic devices are equipped with LED dot matrix displays, mobile phone handsets. The keyboard and case are complemented by gorgeous LED decorations, and more and more electronic devices are designed. In addition, in the field of white goods, the market of China, India and other countries, which are gradually becoming mature to a considerable extent, is also developing toward high performance. Many displays and decorations using LEDs are easy to make people feel different from the visual, so the demand It is expanding.

LED driver development trend

In the above context, a decorative LED driver IC that requires an LED to supply current to illuminate can control a larger number of LEDs in a more flexible lighting mode.

However, the constant current type LED driver used in LCD backlights and the like has adopted a constant current circuit to configure one LED element. Increasing the number of LED lamps increases the chip area and increases the cost, so it is often taken away. However, in recent years, LEDs have progressed in high luminance, and LEDs can be illuminated with sufficient brightness with a small current value, and the constant current circuit itself does not increase.

On the power supply (positive side) side of the LED, a sequentially driven PMOS transistor is built in for time-division lighting, so that a larger number of LEDs can be individually controlled (Fig. 1). As shown in the figure, the conventional LED driver uses 6ch constant current circuit to illuminate 6 LEDs, while the dot matrix driver can control 9 LED components with 3ch SW circuit and 3ch constant current circuit. .

Circuit structure of traditional LED driver and dot matrix LED driver
Figure 1 Circuit structure of a conventional LED driver and a dot matrix LED driver

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