The ACXnnnAKM pattern is used in Sony LCDs, but this particular number is not listed anywhere I can see.
(2) Low temperature LCD (example) ACX*1 704*2 A*3 K*4 M*5 *1 : Sony low temperature LCD mark *2 : Product number : 300 to 499 (Transmission) / 700 to 999 (Reflection) *3 : Improvement mark *4 : Classification for display *5 : Mount, module format mark