You can't, you can see why with a simple experiment:

1. Walk into a very well lit room, set the camera to aperture priority (Av) and select reasonable exposure values (for example, f/5.6, ISO 400) also set the camera to capture raw files

2. Turn off all the lights so that the room is fairly dark, take a picture of one of the walls (if you don't have a tripod it will come out blurry, that's ok) look at it on the display - it will look very bright.

3. Turn on al the lights, take the same picture again, look at it on the camera LCD - it will look less bright.

4. Load the images into a raw processor (like Lightroom, Adobe Camera Raw, Darktable or Raw therapy) adjust the light balance using the same point and look at the pictures side by side - they will have almost the same brightness !

That shows us that the way we see the image on a screen changes depending on the environment, so, even if we make two screens output the exact same image (and that isn't easy to do) they will look different to us.

And I'm intentionally not going into screen calibration and color calibration because that's a very complex thing and the question is only about brightness.

so, if you want the images to look brighter on the computer you choices are:

1. Take lots and lots of pictures, learn how the camera behaves and how you can expect the picture to look on the computer, also learn to use the histogram, than compensate based on your knowledge and not the LCD image.

2. Whenever you view images on the computer, turn off the lights first :-)