FPDs (flat panel displays) are available in a variety of sizes and performances, from large devices such as digital signage to small and medium-sized devices such as smartphones and smart watches. Moreover, the development of new display devices is progressing rapidly.
Since there are many processes in FPD manufacturing from the acceptance of mother glass to the final product, it is necessary to increase the non-defective rate in each process and perform advanced quality inspection that can reliably detect defective products.
Today, many of these processes are image-based. Industrial image sensors of Sony Semiconductor Solutions Corporation, with their high-sensitivity, high-resolution, high-speed, low-noise characteristics, contribute to the improvement of quality control and productivity in the manufacturing process.
Glass surface flaw inspections
Image sensors are used in FPD manufacturing plants at processes to detect minute flaws on panel surfaces and wiring pattern abnormalities at the array process and impurities in cell surface. High image quality, high-resolution, high-speed global shutter image sensors are used for this application. On the other hand, polarization image sensors are used to detect the scratches apart from dirt that naturally has random unevenness, since they are capable of ascertaining differences in the degree of polarization based on differences in surface condition.
Display unevenness inspections
When large image sensors are applied for the flaw inspections of displays, it is required to accurately measure the brightness of each pixel on the inspection screen to detect any defects or unevenness.
To improve the accuracy, uniform pixel performance is required in the image sensor side. Sony’s large rolling shutter image sensors are suitable for such flaw inspection in precise level, because they offer not only high sensitivity performance but also low noise characteristics under dark conditions and less defects of pixels, despite having over 100 million pixels.
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Image Sensor for Industrial Use
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