This is a mechanical issue, not an electrical one.
LCDs only turn dark in defined segment areas. The remaining areas have no electrical contacts and cannot change state under electrical control.
The damage shown will be caused by excessive physical pressure between the face and the back, like by an over-tightened clamp.
It might be possible to open the thing up, locate the problem assembly, loosen the screws and reassemble to achieve a satisfactory repair.
Electrical contact to an LCD such as this is accomplished through "zebra strips". These are tiny rubberized strips that run along each edge,
between the LCD and the PC board below it. The strips are actually alternating slices of conductor and insulator, at very fine pitch.
When the LCD is clamped to the board, pressure applied to this strip accomplishes the electrical connections.
It looks as though the upper clamp might be bent down, or the zebra strip may have come out of position and is putting excessive
pressure on the back of the LCD. Don't touch the zebra strip with your fingers (oil is an insulator), only with tweezers.
- Leigh