Question

Which LED chips are commonly used in LED display screens?

A. Taiwan Macroblock

B. Hangzhou Silan

C. American CREE

D. Dalian Lumei

Answer 1

Answer: A. Taiwan Macroblock.

Answer analysis:

When discussing the LED chip suppliers commonly used in LED displays, we need to evaluate them based on their popularity and market share in the industry. 

However, it should be noted that the composition of LED displays is not only LED chips, but also includes multiple parts such as drive circuits and control systems, but in this question, we mainly focus on LED chip suppliers.

Now, let's analyze each option one by one:

A. Taiwan Macroblock: Taiwan Macroblock (MBI) has a high reputation and market share in the field of LED display driver chips. 

The LED driver chips they provide, such as MBI5020GP, MBI6656, etc., are widely used in LED displays. 

These chips are efficient, stable, and easy to control, and can meet the various needs of LED displays. 

Therefore, Taiwan Macroblock can be considered as one of the commonly used LED chip suppliers for LED displays.

B. Hangzhou Silan: Although Hangzhou Silan Microelectronics Co., Ltd. is a company with extensive influence in the field of semiconductor design and manufacturing, they are not directly mentioned as LED chip suppliers in the field of LED displays. 

Silan Microelectronics' product line covers multiple fields, including power semiconductors, MCUs, MEMS sensors, etc., but it does not particularly highlight its supply of LED display chips.

Therefore, although Silan Microelectronics has an important position in the semiconductor field, it may not be the most directly relevant option in this question.

C. CREE of the United States: CREE is a well-known LED chip manufacturer, and its products are used in multiple fields such as lighting, backlighting, and display screens. 

However, in the LED display market, although CREE's chips are of high quality, they may not be the most commonly used choice, because there are multiple suppliers in the market that provide competitive products. However, CREE's chips may be selected in specific high-end or special demand occasions.

D. Dalian Lumei: Dalian Lumei is not a widely mentioned supplier in the field of LED display chips. 

In the market, Dalian Lumei may not use LED display chips as its main product, or its market share is relatively small.

In summary, among the LED chip suppliers commonly used in LED displays, Taiwan Macroblock is clear and widely recognized. 

As for other options, although they have a certain position in the semiconductor or LED field, they may not be the most directly relevant in this question.

Therefore, the answer to this question is A, Taiwan Macroblock. At the same time, it should be pointed out that the chip supplier of LED display is not fixed. 

There are many other suppliers in the market that provide high-quality products. 

The specific choice may vary depending on project requirements, cost considerations and other factors.

Answer 2

LED tube core analysis
The display uses CREE or Silan chips. Generally, CREE is promoted first.
1. CREE: American chips, which have good stability and strong anti-static properties. They are widely recognized by peers for their reasonable prices in outdoor display screens. Our company uses pure green tubes with brightness reaching (above 1500mcd, wavelength: extracted from 522-527nm) and blue tubes with brightness reaching (above 300mcd, wavelength: extracted from 472-477nm).
The ratio of the maximum and minimum brightness of CREE tubes is 1:1.2, while that of Nichia is 1:4, which is 6 times larger. The brightness difference of other tube cores, such as Taiwan tubes, is even greater. In addition, the brightness balance effect of CREE tubes is better than that of other tubes due to the small brightness ratio difference. The wavelength error rate of CREE is plus or minus 0.5nm, while that of Nichia is plus or minus 4nm, which is 1.6 times higher. The wavelength error rate of other Taiwan tubes exceeds plus or minus 4nm, which is more than 1.6 times. CREE uses single-electrode packaging, which is the best anti-counterfeiting, and there are no counterfeit products. However, Nichia tubes in the domestic market are not strong enough in anti-counterfeiting, and fakes often exist.
2. Silan: Taiwan chip Hangzhou Silan Company split, its brightness is high, the stability is relatively good, in the past two years, it has been mostly used in outdoor display screens in the industry manufacturers. Our company uses pure green tubes with a brightness of more than 2000mcd, a wavelength of 523-528, and a blue tube with a brightness of more than 350mcd, a wavelength of 622-627.
3. Taiwan Guanglei and Jingyuan red tubes are the most widely used in full-color display screens. The red tube brightness is above 650mcd, and the wavelength is extracted from 622-627.
4. Our company produces display screens with a main wavelength within the range of 5 nanometers and a chip size of 13mil or 14mil; the sealed box has a waterproof performance of IP65, a grayscale level of 256 (8-BITC technology), a flatness of less than 1mm, a white balance of 6500CD, a frame change frequency of more than 60 Hz per second, and a refresh frequency of more than 480 Hz per second. The main performance has reached the industry standard C level.