Deeper Learning

Truly Automated Light and Color Measurement for Tell-Tales and Indicators
Author: Shaina Warner |
When it comes to inspecting the accuracy and uniformity of light-emitting symbols on an instrument panel, manufacturers are faced with a small quality control nightmare. Is it possible to ensure the harmonization of so many different shapes, sizes, colors, and positions of lighted features in a single space? The greatest stride thus far in light measurement over a wide area (such as a complete instrument panel) has been the application of imaging colorimeters. Colorimeters are CCD-based photometric measurement devices calibrated to match human visual sensitivity to brightness and color. These cameras capture high-resolution images of large areas and utilize special analytical software to apply visual inspection tools to capture data across an image. With an entire panel captured in a single image, colorimeters provide a two-dimensional environment where light and color data may be assessed for all illuminated symbols on an instrument cluster at once. Well... sort of...

Main functional elements — lens, filters, shutter and CCD — of an imaging colorimeter.
Author: Hubert Kostal |

The market for flat panel displays (FPDs) has undergone tremendous growth, driven mostly by increased demand for televisions, cell phones, computers, digital cameras and MP3 players. Similarly, applications for solid-state sources are expanding and include automotive lighting, surgical lamps, architectural luminaires, LED signs and a variety of consumer lighting products.

The need to support higher production quantities, together with escalating consumer demands for quality and competitive pressure, requires a metrology system that can provide manufacturers with high speed, accurate measurements of display and source luminance, color and defect characteristics. 

In this article we look at the basic operating principles and performance tradeoffs of imaging colorimeters, a class of instruments that enable spatially resolved measurements of color and luminance that are directly applicable to FPDs and solid-state sources...


How to Use Imaging Colorimeters to Improve OLED Display Production
Author: Radiant Vision Systems |

OLEDs (Organic Light-Emitting Diodes) are emerging as the next wave of technology in the flat-panel display market. This is exciting because OLED displays promise improved display appearance for both smartphones and large-format TVs at lower cost and power than other display technologies. OLEDs have superior contrast ratios and sharper images with deeper blacks and more vibrant colors. They require no backlight, resulting in a thinner, lighter-weight display that uses less power. OLEDs also bring a dramatic boost in responsiveness, about 1,000 times faster than existing technologies, virtually eliminating blur on fast-moving and 3D video...


Selecting a Light Measurement Solution: 7 Critical Parameters
Author: Radiant Vision Systems |

Precision measurement of luminance and chromaticity in information displays, light sources, or other light emitting or reflecting materials requires careful consideration of application requirements in order to identify the optimal light measurement system for the job. Resolution, imaging speed, and other parameters should be carefully weighed when designing a system. Imaging colorimeters are high sensitivity, high-accuracy CCD-based imaging systems and with multiple sensor, filter, and lens options available, and these systems can be optimized to meet the specific needs of an application. The priority of each of the following parameters should serve as a guide for selecting a colorimeter-based system...


Improving Quality Inspection of Flat Panel Displays with Imaging Colorimeters
Author: Radiant Vision Systems |

Perhaps no single component is as critical to the usability and perceived quality of today’s smartphones, tablets, and other electronics as their displays. Flat panel displays (FPDs) serve as the primary interface for these products; FPDs are also embedded in consumer products ranging from appliances, automobiles, and home security systems, to specialized commercial products for the medical, industrial, and defense industries. The importance of display quality to the success of these products and the cost – in both customer experience and the direct cost of repair and replacement - of shipping flawed products is driving manufacturers to seek alternatives to today’s quality control tests that rely on human inspection...


Technology Developments Take CCD Imaging Colorimetry Out of the Lab and Onto the Factory Floor
Author: Radiant Vision Systems |

Manufacturers of flat panel displays, illuminated keyboards, and LED lighting products need accurate, repeatable, and easy-to-use light and color measurement solutions to ensure product quality, generate data, and improve efficiencies on the production line. In today’s marketplace, where margins are thin and customer expectations high, many manufacturers are discovering a competitive advantage in imaging colorimetry systems. Once almost exclusively the realm of R&D labs, these specialized CCD-based systems combine the benefits of automation – speed, flexibility, and repeatability – with the relevancy and accuracy of human vision. Recent innovations in the technology include production-friendly features to meet the speed, accuracy, and connectivity requirements of high-volume manufacturing environments...