The advantages of the rear projection type display screen are small pixel points and high definition. The disadvantages are low brightness, small viewing angle, and short life of the lens lamp (only a few thousand hours); the advantages of the LCD splicing screen are also small pixel points and high definition. The disadvantage is that there are seams, the current minimum seam can reach 1mm. Rear projection and plasma displays are suitable for closer viewing. The advantage of the led display is that it has high brightness and no seams. 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 P1.25, which is 640,000 pixels/m2. The LED display is suitable for viewing indoor locations that are far away.
When using the LED indoor display, it is mainly considered from the following aspects.
1 density. Since the indoor full-color LED chip generates a large amount of heat and the control circuit has a high density, the dot density of the commercial full-color screen cannot be made very high, mainly including P5, P4, P3, P2.5, P2, etc. .
2 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.
3 package form. The LED surface of the indoor full-color LED display has a single lamp, a sub-surface sticker, a three-ply-one-surface sticker and a 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.
4 wicks. As with outdoor full-color screens, high-end products are recommended to use the wick of the National Star.
