A display device which is not harmful to the human eye in respect of blue light includes a display panel, a backlight module, and a light adjusting component. The backlight module includes white light emitting diodes (LEDs) for emitting light. Each white LED includes a blue light chip and a yellow fluorescent material encapsulated on the blue light chip. Thereby, transmittance of the light adjusting component for blue light having a wavelength less than 450 nm is less than 10% and transmittance of light adjusting component for blue light having a wavelength over 470 nm is not less than 90%. The light adjusting component reduces the emission from the display device of yellow light having a wavelength of about 575 nm to 595 nm.