In the indoor environment, the large-scale full-color electronic display with an area larger than 5m2 mainly has three options: ordinary rear projection, DLP (digital liquid crystal rear projection) and LED display.
The advantages of the rear projection type display screen are small pixel points and high definition, and the disadvantages are low brightness, small viewing angle, and short life of the lens lamp (only a few thousand hours). The advantage of plasma splicing is also that the pixel points are small and the definition is high. The disadvantage is that there are seams. At present, the smallest seam can reach 1mm. The rear projection and plasma display are suitable for closer viewing. The advantage of the LED display is that the brightness is high and there is no seaming. The disadvantage is that the pixel particles are thicker and the definition is lower. At present, the commercial indoor full-color LED display has the highest density of P4, which is 62,500 pixels/m2. The LED display is suitable for viewing indoor locations that are far away.
Key issues to consider when selecting an LED indoor display
When using the LED indoor display, it is mainly considered from the following aspects.
1 real pixel and virtual pixel. Like the outdoor full color screen, the number of pixels in the indoor full color screen is also divided into real pixels and virtual pixels.
2 dies. As with outdoor full-color screens, it is generally recommended that the indoor full-color screen blue and green tubes be made of Silan's core, and the red tube with light or wide. High-end products are recommended to use Japanese Nichia and American CREE dies.
3 package form. The LED surface of the indoor full-color LED display has several types of single lamp, sub-surface sticker, three-ply-one-surface sticker and three-in-one surface sticker, and the appearance is also different. The advantages of surface-mount package are large viewing angle, good luminous consistency, and easy automatic welding processing. It is the mainstream product of full-color LED screen, but the price is relatively high now; the single-lamp viewing angle is relatively small, the brightness is slightly higher, and the price is lower. The sub-surface sticker is actually a kind of single lamp. Single and sub-stickers are cheaper and are a transitional product.
4 density. Since the indoor full-color LED chip generates a large amount of heat and the density of the control circuit is high, the dot density of the commercial full-color screen cannot be made very high, mainly including P5, P6, P7.62, P8, P10, etc. .
5 drive mode. The driving mode of the indoor full-color LED display is constant current driving, which adopts dynamic scanning mode (mainly 1/4, 1/8, etc.). In the case of the same die, the 1/4 scan circuit requires more, and the brightness is higher.
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