Answer: A. Products with a pitch of ≤2.5mm or less are collectively referred to as small pitch.
Answer analysis: When discussing the correctness of the description of small pitch, we need to analyze each option one by one based on the current industry definition, technical characteristics and application scenarios.
A. Products with a pitch of ≤2.5mm or less are collectively referred to as small pitch:
Small pitch LED display screens usually refer to products with a dot pitch of P2.5 (i.e. 2.5mm) or less. This definition is widely accepted in the industry because it marks the development of LED display screens from traditional billboards and large display screens to higher resolution and more sophisticated displays. Therefore, the description of option A is accurate.
B. The smaller the pitch, the better the display effect of the screen:
Although small pitch LED display screens can achieve higher resolution and more delicate pictures due to the reduction of dot pitch, the statement that "the smaller the pitch, the better the display effect of the screen" is not absolute. The display effect is also affected by many factors such as screen brightness, contrast, color reproduction ability, viewing distance and angle. In addition, too small a pitch may lead to a sharp increase in costs, while the performance improvement is not significant, and may even cause viewing discomfort due to too small a pixel pitch. Therefore, the description of option B is too absolute and inaccurate.
C. Small pitch can completely replace projectors:
Small pitch LED display screens and projectors each have their own advantages and application scenarios. Projectors have certain advantages in cost, portability and large-size display, while small pitch LED display screens perform better in resolution, brightness, color reproduction and stability. The two cannot completely replace each other, but choose the appropriate display solution according to specific needs. Therefore, the description of option C is inaccurate.
D. The only advantage of small pitch and splicing screen is no seam:
The advantage of small pitch LED display screens over splicing screens (such as LCD or DLP splicing screens) is not only no seam, but also higher resolution, wider viewing angle, better color reproduction and higher brightness. No seam is just one of the many advantages of small pitch LED display screens. Therefore, the description of option D is too one-sided and inaccurate.
In summary, the correct description of small pitch is option A: products below ≤2.5mm are collectively referred to as small pitch.