need help with line animation.

It made a line with thickness of 1.0.
At a speed of 10 ms, x: 0.01 in incre

Blinking occurs as the line moves.
I think there is a problem with anti-aliasing. But don’t know exactly why.

What exactly is this phenomenon called?
What are the solutions?

Aliasing.

Oversampling or multisampling. Zooming in (thicker lines, higher scale factor). GL_LINE_SMOOTH. Use of a sRGB framebuffer (for gamma-correct blending).