Application of DLP LED light source projection equipment

　　DLP projection equipment has undergone nearly 20 years of development, and has gradually been severely impacted by LCD products in recent years. In order to cope with changes in the market environment, DLP projection equipment using LED light sources has been widely promoted and applied in the past three years.

　　As we all know, the most criticized thing about traditional DLP projection equipment is the UHP light source it uses. The average lifespan of 6,000 hours means that the user's cost of use cannot be reduced. However, LED light sources have a service life 10 times that of UHP, which solves this problem very well. But are the current LED light sources perfect? ​​What aspects should be paid attention to during use?

　　1. Choice of brightness and color gamut

　　Although LED light sources have already reached K-level lumen brightness in traditional outdoor LED displays, they are still generally in the 600-800 lumen range (high-brightness working mode) in DLP applications. Therefore, stricter control must be exercised over the ambient light in the use environment in order to minimize customers' sensitivity to insufficient LED light source brightness.

　　At the same time, due to the wide color gamut characteristics of LED light sources (see Figure 1), we have the opportunity to apply it in more complex environments. If the ambient light source is a common cold white light or incandescent lamp, it is recommended to adjust the color temperature to the range of 7500-9300K, so that the human eye can feel higher brightness and more vivid colors.

　　2. Heat Dissipation

　　Due to the spectral characteristics of LED light sources, the heat generated by the light source part is higher than that of UHP under the same brightness (see Figure 2). Therefore, the heat dissipation design requirements for the entire projection display unit and the control requirements for the ambient temperature are higher. At present, the mainstream heat dissipation methods are mainly air cooling and water cooling. It should be said that each has its advantages and disadvantages. Air cooling is more traditional and mature, and the heat dissipation efficiency of water cooling is slightly higher than that of air cooling, but the design difficulty is higher, and the reliability of long-term use remains to be tested.

　　3. Maintenance

　　Traditional UHP light sources have a short life span and fast brightness decay, which means that after they are put into use, they need to be debugged regularly at a high frequency to maintain brightness and color uniformity at a certain level. The long life span and low decay characteristics of LED light sources have greatly improved this situation. At the same time, since there is no color wheel, there is no need to consider the impact of long-term dust on the output color of the light machine (see Figure 3). This greatly saves the manpower expenditure required for maintenance.

　　4. Cost of Use

　　Since the life of the LED light source reaches 60,000 hours and there is no color wheel, theoretically

　　You don’t need to consider the cost of consumables during the normal use period.

　　To sum up, LED light source projectors have taken a big step forward in terms of usage effect and maintenance cost compared to UHP. As long as a breakthrough is made in light source brightness as soon as possible, it can be foreseen that it will dominate the entire high-end large-screen splicing market within a certain period of time.