Let’s assume that you already maxed out the brightness controls.  Did you check the power management?  If you’re running the laptop on batteries, it will often default to power savings mode, which will dim the screen. Also, crank up the contrast ratio to 5 to 1 or even higher.  Does your computer think it’s dark out? Verify the dimming range is adjusted for the daytime, not the night.  Adjust the viewing angle of the display screen. It sounds trivial, but the angle can make a big difference in how the screen is viewed.