The resolution and refresh rate of an LCD screen both have an impact on the display performance. Here are their specific functions and effects:

1. Resolution:

Resolution refers to the number of pixels contained within a unit length or unit area on the screen. Common resolutions include HD, Full HD, 2K, 4K, etc.

Higher resolution means a greater number of pixels on the screen, resulting in clearer and more realistic image details. 

Higher resolutions provide better image quality, especially noticeable when displaying content with rich details such as HD movies and games.

2. Refresh Rate:

Refresh rate refers to the number of times per second that the LCD screen refreshes the image, typically measured in Hertz (Hz). Common refresh rates include 60Hz, 120Hz, 144Hz, etc.

A higher refresh rate provides a smoother image display, particularly when viewing high-speed dynamic content such as fast-moving images or fast-paced games. 

A higher refresh rate can reduce perceptual blurring and motion blur effects.

Note:

The improvement of display performance through resolution and refresh rate is independent of each other. Increasing the resolution does not necessarily mean an increase in the refresh rate, and both factors need to be considered separately.

The resolution and refresh rate of an LCD screen are usually determined by the hardware, and choosing the appropriate device can meet different needs. For most general-purpose display devices, commonly available resolutions and refresh rates are usually sufficient.

High resolution and high refresh rate can have an impact on battery life and performance, especially for mobile devices such as smartphones and tablets. Therefore, it is necessary to balance these factors according to one's own needs when selecting a device.