1. Shield the glass first
Before anything touches the corners, lay a rigid sheet against the screen: a cut foam board, heavy cardboard, or the face pad the set may have shipped with. This spreads any point pressure across the whole panel instead of letting one spot take a hit. Skip this layer and corner foam alone will not stop a flex crack down the middle of the glass.
2. Corner blocks absorb the drop
Four molded foam corners are what actually take an impact when a box gets set down hard or slides off a stack. Cut or buy blocks sized to the exact thickness of the panel so they sit flush against both faces and the edge between them. A loose corner block shifts in transit and stops protecting at the one moment it was there for.
3. Foam rails along every edge
Between the corner blocks, run foam or a dense edge protector down each side so the glass never touches bare cardboard. That gap between panel and box wall is what keeps a bump on the outside of the carton from turning into a crack on the inside. An inch of standoff space is a reasonable minimum on a screen this size.
4. Double-box the whole assembly
Once the panel is cushioned, that inner carton goes inside a second, larger box with two to three inches of rigid filler between the two walls, the same principle used to ship any breakable item. The inner box carries the padding; the outer box carries the rough handling, the dropped corner, the stacked pallet, the hand truck bump, none of which should ever reach the screen directly.
5. Mark it, and orient it, on every side
Put arrows on all four vertical faces of the box, not only the top, since a rough sort can set a carton down on whatever face happens to be closest. Strap or tape the box so it physically resists being laid flat, rather than trusting a printed label by itself. Markings help a person who actually looks at them; they do nothing on an automated belt, so the packing underneath has to be the real safeguard.
6. Keep the factory box if it survived
A set's original carton was built around one specific chassis, its foam pressed to the exact width and corner radius of the model it shipped with. A universal TV kit or a resized moving box only approximates that fit, however carefully you pack it. If the factory box is still in the garage, it is worth more than its weight in bubble wrap for exactly this trip; if it isn't, the double-box method above is the honest fallback.