Macbook display flickers with 22" LED Display

Question

I've purchased an LG 21.5" LED Display with model no. E2250T and I've connected it to my macbook with a mini display to VGA adapter. It work's fine in lower resolutions, but when I choose the best resolution 1920x1020 , display starts flickering randomly and sometimes it goes to power saving mode. I have the same problem with another Monitor-TV (AOC 22") when in high resolution.

The lower resolutions are fine but its not pleasing. Is it the adapter? I'm connecting displays with a VGA cable since I don't have a mini display to DVI adapter. I can purchase that adapter if it solves my problem.

Answer 1

The E2250T manual says

‘Self Image Setting Function’? This function provides the user with optimal display settings.When the user connects the monitor for the first time, this function automatically adjusts the display to optimal settings for individual input signals.

and

‘AUTO’ Function? When you encounter problems such as blurry screen, blurred letters, screen flicker or tilted screen while using the device or after changing screen resolution, press the AUTO function button to improve resolution.

…

Recommended Display Mode for E2250T/E2350T
Mode (Resolution)    Horizontal Freq. (kHz)    Vertical Freq. (Hz)
*12   1920 x 1080    67.500                    60

Answer 2

Ok, I purchased the Mini Display to DVI adapter the same day I asked my question and I connected the display with this adapter.

Its fine, and working perfectly. The problem was the VGA adapter. Thanks guys.