Insofar as a photograph can reliably convey colour balance, your iPad appears about as expected. The photo might suggest that the backlight is set to a high brightness level. The screen coatings can also produce a blue-purple tinge in some ambient lighting conditions.
An LCD panel can never produce “true black” - as the LCD pixels simply block light from the full screen backlight. It does this by changing the polarisation of pixels in relation to a fixed polariser placed in front of the backlight. This technology in never perfect in blocking all light - particularly at high backlight settings.
OLED screens work differently, in that individual pixels emit light directly instead of relying upon a screen backlight. As such, the light-source can be entirely turned-off at a pixel level - resulting in no light from individual pixels. Maybe one day we’ll see OLED screens on iPad, but at present Apple only use this screen technology with some premium iPhone models.
I hope this is helpful to you in setting your mind at ease. If you are still concerned, a visit to your local Apple Store, or retailer, will provide opportunity to compare with similar devices.
