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The favored aspect ratio of mass-market display industry products has changed gradually from 4:3, then to 16:10, then to 16:9, and has now changed to 18:9 for smartphones. [7] [needs update] The 4:3 aspect ratio generally reflects older products, especially the era of the cathode ray tube (CRT).
The term "4K" is generic and refers to any resolution with a horizontal pixel count of approximately 4,000. [4]: 2 Several different 4K resolutions have been standardized by various organizations.