Data display

My aaData looks good:

[{"DT_RowId":"row_3","EquipmentName":"Ball","f_LanguageID":"0","tblLanguages":[{"LanguageID":"0","LName":"English"}]},{"DT_RowId":"row_4","EquipmentName":"Bal","f_LanguageID":"1","tblLanguages":[{"LanguageID":"1","LName":"Dutch"}]}]

But the language name doesn't display:

"aoColumns": [
{
"mData": "tblLanguages.LName"
},
{ "mData": "EquipmentName" }

],

###

Why?