The monitor at home is a fish screen with a resolution of 2560*1080. When connected to the Raspberry Pi, it always fails to display normally. After many twists and turns, I finally found a solution in the official forum:
Find config.txt in the boot partition and copy the following content into it.
hdmi_drive=2
hdmi_ignore_edid=0xa5000080
hdmi_group=2
hdmi_mode=87
hdmi_aspect_21_9=7
hdmi_pixel_freq_limit=400000000
hdmi_cvt=2560 1080 50 7 0 0 1
#config_hdmi_boost=4
max_framebuffer_width=2560
max_framebuffer_height=1080
framebuffer_width=2560
framebuffer_height=1080
As you can see from the photo, the web page displays perfectly:
This method of customizing the resolution is still very useful. For example, the resolution of the LED large screen is often non-standard. If the system resolution is inconsistent with the screen hardware resolution, the screen will be stretched, deformed, and Incomplete and other issues.
If the large-screen player no longer uses the Windows system, but uses the "Raspberry Pi hardware + custom resolution" solution, this problem can be solved very well.
References:
https://forums.raspberrypi.com/viewtopic.php?t=203100