20X Microscope Lens

Radiant Vision Systems 20X Microscope Lens
Radiant Vision Systems 20X Microscope Lens

Powerful optical component for ultra-high-resolution imaging of micron-scale display pixels and subpixels.

The Radiant Vision Systems 20X Microscope Lens enables high-resolution imaging of extremely small components and features, such as individual pixels and subpixels of OLED, microLED, microOLED, and other emissive displays. The lens provides 20X magnification, applying a greater number of image sensor pixels per display pixel or component feature for fine-detail measurement. The lens mounts directly to a ProMetric® Imaging Colorimeter or Photometer, and features ProMetric or TrueTest™Software for intuitive system setup and configurable automated measurement sequences. 

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Displays continue to increase in resolution and pixel density. Microdisplays such as those used for AR/VR/MR devices and smart watches can have hundreds or even thousands of pixels per inch (PPI). At the same time, these pixels and their subpixels can be as small as a few microns across. Manufacturers need to measure much smaller elements than ever before to ensure accuracy of light output, color, and other qualities.

microLED displays in production

This is especially true of emissive displays like OLED, LED, microLED or microOLED where each pixel in a display produces its own luminance and therefore can vary in output from pixel to pixel. These individual variations (called mura) can cause non-uniformity of the display that is visible even at a distance, especially when viewing the display at high bright states. 

The 20X Microscope lens can be used with a ProMetric Y-series Imaging Photometer for luminance-only measurement or a ProMetric I-series Imaging Colorimeter for measuring values of luminance and chromaticity. Extensive data analysis and display functions are also supported, including isometric plots, cross-sectional graphs, radar plots, and bitmaps.

Evaluate Individual Display Pixels

The magnification of the 20X Microscope Lens enables the imaging colorimeter or photometer to focus a greater number of image sensor pixels per display pixel for fine-detail measurement. Paired with a ProMetric® Imaging Photometer or Colorimeter, it enables users to acquire more precise pixel detail and increase the consistency of accurate measurements. The lens magnifies details of the display sensor while capturing display pixels and subpixels over several sensor pixels of high-resolution (61MP) image sensors for increased measurement precision. This combination of value, high performance, and flexibility offers manufactures easy-to-use measurement control, optimizing testing efficiency and supporting advanced analysis.

20X Lens-zoom in_subpixel luminance_false color

Emissive display subpixel luminance shown in false color scale.

Once measured, discrepancies in output from pixel to pixel can be calculated and applied as corrections. This normalization of pixel outputs (called demura) produces a display of entirely uniform appearance. These calibrations can be carried over from design to ensure accurate pixel output for the given substrate or pixel layout of devices in production operations.

Characterize Subpixel Patterns

Subpixel patterns can be challenging to characterize without a very high-resolution system and optics capable of microscopic measurement. The 20X Microscope Lens magnifies images by a factor of 20, enabling design manufacturers to ensure accurate subpixel layouts, shapes, and RGB color patterns. As shown in this image, the 20X Microscope Lens can achieve extreme detail in a very small spatial area to properly image individual elements with a substantial amount of separation between light regions.

20X Microscope Lens_pixel zoom composite

Full FOV image of an emissive display captured using a ProMetric 61MP Imaging Colorimeter with 20X Microscope Lens. Inset: Zoomed in image of a single subpixel.

Parameter 20X Mixroscope Lens
Primary Application High-resolution measurement of small components and display features 
Working Distance to Front of Lens 30.5 mm
Paired Camera I2 I8 Y16-G or I16-G I29 Y45 Y61 or I61
Approx. Field of View 0.4 mm x 0.3 mm 0.9 mm x 0.7 mm 0.7 mm x 0.4 mm 1.8 mm x 1.2 mm 1.3 mm x 0.9 mm 1.8 mm x 1.2 mm
Spatial Resolution (per sensor pixel) 0.28 µm 0.28 µm 0.14 µm 0.28 µm 0.16 µm 0.19 µm
Approx. Effective F Number F/36
Numerical Aperture 0.28
Measurement Capabilities Luminance, Radiance, Illuminance, Irradiance, Luminous Intensity, Radiant Intensity, Power, Radiant Flux

Specifications subject to change without notice.

If there are any discrepancies between the specifications listed here and those shown in the published product Spec Sheet, the Spec Sheet information should be considered authoritative.

The 20X Microscope Lens is ideal for capturing small details in extremely high resolution. The camera/lens solution offers photometric or colorimetric imaging efficiency to address both lab and in-line applications:

  • High-resolution imaging of extremely small components and component features such as microdisplays and microLEDs
  • Evaluation of display pixels and pixel structures (including subpixels) of ultra high-resolution displays
  • Evaluation of individual LEDs, microLEDs, microOLEDs, and other emissive elements
  • Characterization for display design and R&D
  • Measurement for quality control and correction in production and at end-of-line

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