对了，由于在4k分辨率下刷新率仅为30Hz，比较影响使用体验，是否有办法保持4k的分辨率，同事将刷新率提高到60Hz。如果不行，是否可以通过外接USB显卡之类的方式来实现？再次感谢！   BTW, as it only supports 30Hz in 4k resolution, it has really impacted the using experience. Is there any way to have 60Hz in 4k resoultion? If not, do you think if I can try to connect an external device like USB display adapter on this laptop for my requirement of 4K@60Hz? Thanks again!

感谢二位的回复，关于Type-C接口外接显示器，我看到二位的答复稍有不同，Hou-YJ的答复是Type-C既可以做图像/视频传输，也可以给笔记本电脑充电（假定外接显示器是支持的），而GOLD_MASTER的答复是该Type-C接口仅能用于给笔记本电脑充电，无法支持图像/视频显示。是否能帮忙找到该笔记本型号的产品手册/说明书？非常感谢！   Thanks for your reply. Regarding to connecting an external monitor over Type-C port of HP ProBook 445 G7 laptop, I could see the answers of you two are a little bit different. Hou-Yj said the external monitor is able to display the image/video by connecting this Type-C port, as well as support charging the laptop. But GOLD_MASTER said this Type-C is only able to support charging the laptop without displaying image/video. May I request your additional help to find out the product manual/specification or any related documentation of this HP ProBook 445 G7 laptop? Thanks very much for your help!