XGIMI H5 Compound Eye Lens: What are compound eyes good for?

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The Xgimi H5 uses the SUPER full color LED system and has a custom 300 partition compound eye lens. So what is a compound eye lens? The compound eye lens is placed inside the machine for use in the light path system and is an essential part of the reflective equipment, it is also a beneficial optical component in the lighting system, it can be used to generate a uniform irradiance distribution.

XGIMI H5 Compound Eye Lens.jpg

What is compound eye?​


The compound eye is made up of tens of thousands of single eyes, just like the eyes of dragonflies and flies. The fly compound eye consists of more than 3,000 small eye units with their own optical systems that work both in concert and independently. As a result, the fly's eye not only has high speed and high precision resolution, but also can effectively calculate its own orientation and distance from the observed object, thus facilitating faster judgments and reactions.

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What is compound eye lens?​


The fly-eye lens is composed of a plurality of small lenses integrated and arranged, and the two fly-eye arrays are arranged in parallel to make the transmitted light evenly distributed. The key to realizing uniform illumination with double-row fly-eye lens array is to improve its uniformity and illumination brightness.

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How does compound eye lens achieve uniform illumination?​


When we want to see a moving or still picture through a projector, we need the picture to be uniformly illuminated and presented on the screen. So in order to achieve uniform illumination, the spatial light modulator needs to be uniformly illuminated.

Normally, the illuminance distribution of the light source is Gaussian, so it is not possible to illuminate the spatial light modulator directly and uniformly. We must "de-Gaussianize" the illuminance distribution to make it uniform.

Arrays of compound-eye lenses are usually found in pairs and work together with the spotting mirrors to provide a uniform distribution in the illumination plane. The focal point of each small unit lens in the first array of compound eye lenses coincides with the center of the corresponding small unit lens in the second array of compound eye lenses.

The optical axes of the two columns of compound eye lenses are parallel to each other, and the spotting mirror is placed behind the second column of compound eye lenses, and the focal plane of the spotting mirror is placed on the illumination screen to form a uniform illumination system.
How does compound eye lens achieve uniform illumination?

The light source S is placed on the focal point of the collimating lens L1, and the center of each small lens on the compound eye LA2 is located at the focal point of the corresponding small lens of the compound eye LA1.


The compound-eye lens of XGIMI H5 has 300 divisions, and the brightness uniformity is >88%. Dangbei F5 has 434 partitions, and the brightness uniformity is more than 90%. The main reason is that the XGIMI H5 is made of plastic, while the Dangbei F5 is made of glass. The image projected with glass material will be more transparent than that of plastic material, and the picture effect will be better. The number of partitions means that the more partitions there are, the more delicate the picture will be.

Pros of Glass Compound-eye Lens​


1. The glass compound eye lens has ultra-high heat resistance and thermal conductivity. Even at a high temperature of 200°C, the glass compound eye lens still has a stable refractive index, making the picture brightness output more stable.

2. The glass material is stronger and more stable, and there is no risk of the film release, film cracking, yellowing, and color cast that are prone to occur with plastic materials.

3. The glass material has a longer life and a higher light transmission rate.
 
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