got wrong size of screen in electron and chrome

Question

I want to get the real screen size to do sth in my electron app.

const { app, BrowserWindow } = require('electron')

let mainWindow = null

app.whenReady().then(() => {
  // We cannot require the screen module until the app is ready.
  const { screen } = require('electron')

  // Create a window that fills the screen's available work area.
  const primaryDisplay = screen.getPrimaryDisplay()
  const { width, height } = primaryDisplay.bounds

  mainWindow = new BrowserWindow({ width, height })
  mainWindow.loadURL('https://electronjs.org')
})

But in my conputer,the resolution ratio is 1920x1080,scaling and system fontsize are both 100%.But the screen size I got was 1536x864,same as in chrome.
And I found that,when the system fontsize was zoom out,the real screen size got by screen object was smaller.
How can I get the real size of screen?