What are the main application areas of DLP technology?

DLP is the abbreviation of Digital Light Processing. Its working principle is to solve the image signal based on data and cast light. This technology has high image fidelity and can project clear, bright, and realistic images, mainly used in projector systems.

The core of DLP technology is MEMSDMD, also known as AM1808BZCE3 spatial light modulator. The interior of DMD is composed of many small aluminum mirrors, each lens being equivalent to one pixel, which directly determines the resolution. DLP technology is just the tip of the iceberg. In fact, DMD is a type of infrared, ranging from light modulation to 363nm and then to 2500nm. With such a large coverage area, as well as the high rotation speed and controllability of reflective lenses, DMD can achieve non display applications such as 3D printing, 3D machine vision, and PCB lithography.

DLP 3D printing

3D printing is a popular industry in the market. With the advancement of science and technology, 3D printing technology is no longer as advanced and has officially entered public life. DLP technology not only represents the industry, but also has a high market position in 3D printing.

SLA and SLS are mainly used for 3D printing. In fact, SLA and SLS are two 3D printing technologies with similar completion principles, which complete the drying and curing of printing materials based on high toughness light irradiation photosensitive resin or metal powder. Among them, SLA uses UV cured resin, indicating that SLS uses near-infrared light fusion fracture and dry solid metal powder.

What are the advantages of DLP based SLA and SLS compared to traditional 3D printing technology? SLA and SLS use area array exposure dry solid printing materials for DLP based 3D printing technology. Generally speaking, traditional 3D printing technology mainly uses laser light sources or scanning to expose the printing materials in a dot matrix, resulting in relatively low overall printing efficiency. However, 3D printing using DLP technology accumulates layer by layer in the form of an array, which naturally improves printing efficiency. Meanwhile, due to the wide band supported by DMD, when facing different printing materials, the printing light source can be changed according to the specific situation, making 3D printing technology more flexible.

DLP 3D machine vision

3D machine vision is seen through some technical means or devices. When the device has 3D vision, it can scan, inspect, and locate different usage scenarios. There are many ways to complete 3D vision of equipment, such as using binocular cameras, lasers, Structured light and other technical means, while DLP3D machine vision is achieved through Structured light.

The implementation principle of DLP3D machine vision is shown in the above figure. When DMD projects a beam of light onto the object to be tested, due to its appearance characteristics, some corresponding lines will be generated. Then, the object will be captured by a high-speed industrial camera, and the captured transmission data will be transmitted to the computer, where the Z-axis coordinates will be calculated through software.

There are many ways to complete the machine vision Structured light generator, so why use DLP technology? The main reason is that DMD is a highly stable MEMS, and the Structured light generator based on DLP technology can obtain high frame rate and high-speed export through the high-speed rotation of the DMD mirror. Most importantly, the Structured light generator based on DLP technology can use different wavebands in different use scenarios. For example, infrared bands are applied to biological measurement scenarios, while ultraviolet rays are applied to metal, liquid, and glass measurements.

DLP maskless lithography

In recent years, DLP technology has attracted high attention in the field of PCB printed circuit board lithography applications. Although traditional PCB lithography has developed very mature, it is difficult to keep up with the New York Times in terms of efficiency, cost, accuracy, and environmental protection. The digital lithography technology based on DLP is only based on traditional lithography technology, achieving intelligence and keeping PCB lithography up with the pace of The New York Times.

DLPCB lithography mainly adopts DLP high-speed, high-resolution, and UV light applications. Its working principle is UV beam expansion, straight, and symmetrical light. According to the reflection of the mirror, it is parallel to the DMD, and then a DMD mirror is made, which is projected onto the desired lithography substrate through the DMD. Compared with traditional projection imaging lithography, the difference between DLP lithography is that it uses digital imaging technology, which can adjust the required lithography pattern through digital input, reducing product costs without the need for masks required for traditional lithography.

It is worth mentioning that there are thousands of small reflective lenses on DMD chips, each of which can reflect an equivalent independent light source. This means that area array exposure can be achieved in the lithography process, greatly improving production efficiency. Especially in relatively complex graphics, DLP lithography technology has more advantages.

DLP theory is a Digital Light Processing technology. In practical applications, real-time dynamic adjustments can be made to different usage scenarios, with a certain degree of scalability. At present, DLP technology is no longer limited to display applications, but gradually extends to industries, automotive electronics, diagnosis and treatment, and the possibilities for the future are endless.

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