Electronic device having flexible display module

An electronic device comprising:

• at least one housing;
• a display module having a first region, a second region and a third region between the first region and the second region, comprising:
• a window comprising a first portion having a first thickness in the first region, a second portion having a second thickness in the second region, the second thickness being less than the first thickness, and a recessed portion in the third region;
• a support plate supporting the display module and having a plurality of slit holes in the second region and the third region;
• a multi-bar assembly coupled to the display module and configured for sliding-in or sliding-out the display module;
• and
• a drive module coupled to the multi-bar assembly,
• wherein the recessed portion of the window has a first radius of curvature between the first region and the third region, a second radius of curvature between the second region and the third region, and a third radius of curvature at a point having a minimum thickness in the recessed portion.