Light-emitting diodes ( LEDs ) have been widely used in a variety of terminal devices, from automotive headlamps, traffic lights, text displays, billboards and large-screen video displays, to the latest applications in general and architectural lighting and LCD backlighting, LED Rapid adoption makes the most common equipment also need to be redesigned. As LED efficiency and brightness increase and costs decrease, LEDs may replace traditional lighting technologies in consumer applications. This article explains how to address some of the design challenges faced when using LEDs by comparing some of the techniques used in large-screen displays that use LED-based LCD backlights. Stadiums or billboards use a lot of display panels and thousands of LEDs. In each display array, the brightness of each LED (also called a pixel) can vary greatly, and the difference in brightness between the brightest and darkest LEDs can sometimes be as high as 15% to 20%. Although this problem is a common problem in all LED applications, it is particularly prominent in some high quality display systems that require pixel consistency. To compensate for this difference, vendors typically use two methods: 1. Buy matching or screened LEDs from suppliers; 2. Use high-quality LED drivers with “point correctionâ€. LED suppliers offer matching LEDs and charge a fee. They test these RGB (red, green, blue) LEDs in combination with LEDs that produce similar brightness at specified currents. This method can provide the required brightness consistency for the low-end illumination system with minimal design effort, but each pixel has different fading speed or brightness degradation speed with time, so this method can only be one. a temporary solution. In other words, the brightness of each pixel will no longer be consistent in the next one to two years. In addition, when it is necessary to replace a defective panel, the brightness of the newly replaced panel is visually different from other panels. High-end display systems have high requirements for brightness matching, so using only LED matching is not enough. In order to achieve pixel-to-panel brightness uniformity over the life of the display unit, manufacturers are generally using advanced LED drivers with point correction. Point correction is a method of controlling the brightness of a pixel by adjusting the current flowing into each LED in the array. With point correction, the processor can control all current flowing into the LED panel while the LED driver adjusts the current supplied to each LED and produces consistent brightness. Therefore, the lookup table is no longer needed, and the complex multiplication task of the LED in each refresh cycle is not required, and the processor can use the saved resources to perform other tasks. To achieve point correction, manufacturers measure the brightness of each LED by taking pictures. The darkest LED in the system is designated as the base LED, and all other pixels are compared to it. To make this correction, the current supplied to each pixel is multiplied by a fraction (or fraction) proportional to the intensity of the LED. In a TITLC5940, the dot correction value for each LED can vary greatly from refresh to refresh cycle and can be stored in an integrated EEPROM. This “Double Point Correction†method provides the flexibility to update the entire panel brightness as external lighting conditions change, and provides long-term and non-volatile point correction information to ensure panel brightness consistency. The brightness indicator changes over time, and the data in the EEPROM can be recalibrated. If the panel fails and needs to be replaced, the data in the EEPROM can be rewritten. The following uses a specific example to illustrate this method. Firewall Pc With Tpm,Firewall Router With Tpm,Pfsense Firewall With Tpm,Network Server With Tpm Shenzhen Innovative Cloud Computer Co., Ltd. , https://www.xcycomputer.com