The Dell U2424H offers improved image quality compared to the Dell U2422HE, thanks in particular to a higher refresh rate (120 Hz compared to 60 Hz) and an automatic brightness sensor that adjusts brightness and colour temperature according to ambient light. Both models have a 23.8-inch Full HD resolution with an IPS panel, but the U2424H benefits from these improvements for a smoother visual experience that's adapted to the environment. The U2422HE remains a good choice with good IPS image quality, but the U2424H is superior in terms of display performance and advanced image quality features.