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25 - 27 February 2020 // Nuremberg, Germany

Conferences and supporting programme

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Session 02: Display Measurements

Smart Measurement of Glass Panels Vortragssprache Englisch

Panels for LCD screens have seen a tremendous development in applications over the last decades. Starting with small monochrome displays (remember first digital watches), the real push happened with the upcoming of the smart phone generation, and the market penetration of colored TFT displays for PC's and TV use. During the evolution over decades the modern 3D glass panels have been greatly improved in terms of touch sensitivity, visual aesthetics and technology. Adequate response in development of inspection and quality control approaches was required, which helped to lift the technologies into mass production capability. This paper concentrates mainly on dimensional features and the large choice of sensors, which are needed to generate meaningful quality data. Other aspects arise from mass production effects. First to mention is the speed of inspection, which leads to different approaches for near-/inline inspection towards final quality control. One more is the correlation and monitoring of inspection equipment over different manufacturing locations. How to inspect geometrical features of the different glass types is one of the topics described. Further ones refer to the molds/dies, the material used, and the peripheral equipment which houses the displays. How to tackle high throughput requests is covered by describing quick measurement solutions using multiple CCD cameras and Lasers, plus dedicated software, built into inline inspection stations. Full-Scale Measurement of 2D features can be achieved by use of high a resolution camera and large field of view optics approach. As earlier said, requirements for 3D glass inspection are very challenging today. Metrology wise this corresponds with a whole set of different frames and sensors to be applied. Glass surface profile is inspected using combination of camera and confocal sensors (based on chromatic aberration) with a dedicated frame to cover the required measuring volume. More flexibility users have with a confocal sensor mounted onto an articulated head, allowing to reach any workpiece surface to generate profile data. Maximum flexibility is achieved by use of a Multisensor approach, which allows multiple sensors plus rotating part fixturing devices to be used same time with one frame. If it comes to highest accuracy, dedicated frame design and new sensor technologies cover that request. Newest addition on the sensor side is the integrated roughness measurement, which contributes to qualify non-dimensional features like haptics and shine. All those data generating equipment is embedded in a high-level process monitoring and evaluation system, allowing factory management to keep track on important KPI's like equipment usage, environmental conditions and process capability.

--- Date: 27.02.2019 Time: 14:35 - 14:55 Location: Conference Counter NCC Ost



Wolfram Froehlich

Hexagon Manufacturing Intelligence


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