Interesting and I am interested.
What I see:
You have routines that monitor the screen and if it isn't touched for... n minutes: it turns off the back light.
But you are also wanting to wipe the screen so no one can accidentally press anything.
Thought:
Make a blank screen.
When the back light is turned off, you also send a UI command (or what ever it is called) to then show the blank screen.
Example code:
[{"id":"9a3d3874.9fdf78","type":"ui_template","z":"6dd5ca4d.d1958c","group":"1a1680e.112ee7f","name":"TEL","order":1,"width":"1","height":"1","format":"<div id=\"GButtonM_TEL\">\n <md-button class=\"md-button program-names darkred\">\n <i class=\"material-icons\">\n <span> track_changes</span>\n <md-tooltip>Telemetry</md-tooltip>\n </i>\n </md-button>\n</div>\n\n<script>\n\n(function($scope) {\n\n$('#GButtonM_TEL').on('click', function(e) {\n e.preventDefault(); //prevent default behavior\n $scope.send({\"topic\":\"momentary_regular\",\"payload\": \"BedPi Telemetry\"});\n});\n \n})(scope);\n</script>","storeOutMessages":true,"fwdInMessages":true,"templateScope":"local","x":4650,"y":4560,"wires":[["aea8bfd3.caf268"]]},{"id":"aea8bfd3.caf268","type":"link out","z":"6dd5ca4d.d1958c","name":"Menu","links":["1211148c.996103","e4ee0bad.0a65d","9267665b.45b478"],"x":4830,"y":4560,"wires":[],"l":true},{"id":"9267665b.45b478","type":"link in","z":"6dd5ca4d.d1958c","name":"MENU","links":["aea8bfd3.caf268","f4cda30b.8f21d8","4c993a08.28ee04","4379483c.943be8","32a168f9.467de8","8b04cfd7.4c835","88d31639.e1251","ac9afb66.8f1578","89e46119.4b177","cd0f3073.020e58","4a15a967.ec2a58"],"x":4630,"y":4440,"wires":[["b81f023c.14308","ca8479a5.88833"]],"l":true},{"id":"b81f023c.14308","type":"ui_ui_control","z":"6dd5ca4d.d1958c","name":"","events":"all","x":4810,"y":4440,"wires":[[]]},{"id":"1a1680e.112ee7f","type":"ui_group","name":"EXIT","tab":"e92ac76d.c24e7","order":8,"disp":false,"width":"2","collapse":false},{"id":"e92ac76d.c24e7","type":"ui_tab","name":"Real_World_Control","icon":"dashboard","order":7,"disabled":false,"hidden":false}]
Yes, this is from a button, but I hope it explains the idea.
The name you inject is the same as the blank page/screen you make.
That's my way of seeing it.
Ok.... On the blank screen you make/put a full screen button.....
I can't read. 
And....
(sorry)
When this button is pressed, you maybe want to do some tricks so if it is accidentally bumped, it turns on and then makes sure you want to then activate the screen/bring it back to life.
If not, it puts the screen back to sleep
(From another post)
example code as an example.... (oh boy, sorry)
[
{
"id": "4acb89a30b69f58e",
"type": "ui_switch",
"z": "2e6686c4918f199d",
"name": "",
"label": "safety lock",
"tooltip": "",
"group": "c7a27394.057878",
"order": 14,
"width": 4,
"height": 1,
"passthru": true,
"decouple": "false",
"topic": "topic",
"topicType": "msg",
"style": "",
"onvalue": "true",
"onvalueType": "bool",
"onicon": "",
"oncolor": "",
"offvalue": "false",
"offvalueType": "bool",
"officon": "",
"offcolor": "",
"animate": false,
"className": "",
"x": 230,
"y": 2850,
"wires": [
[
"d0fb6010062ab6ed"
]
]
},
{
"id": "eea3e707e440f91b",
"type": "ui_button",
"z": "2e6686c4918f199d",
"name": "",
"group": "c7a27394.057878",
"order": 15,
"width": 5,
"height": 1,
"passthru": false,
"label": "Action",
"tooltip": "",
"color": "",
"bgcolor": "",
"className": "",
"icon": "",
"payload": "",
"payloadType": "str",
"topic": "topic",
"topicType": "msg",
"x": 570,
"y": 2850,
"wires": [
[
"7f2a4ffc73dbf79b",
"086a722972596909"
]
]
},
{
"id": "d0fb6010062ab6ed",
"type": "change",
"z": "2e6686c4918f199d",
"name": "",
"rules": [
{
"t": "set",
"p": "enabled",
"pt": "msg",
"to": "payload",
"tot": "msg"
}
],
"action": "",
"property": "",
"from": "",
"to": "",
"reg": false,
"x": 410,
"y": 2850,
"wires": [
[
"eea3e707e440f91b"
]
]
},
{
"id": "7f2a4ffc73dbf79b",
"type": "change",
"z": "2e6686c4918f199d",
"name": "disable ",
"rules": [
{
"t": "set",
"p": "payload",
"pt": "msg",
"to": "false",
"tot": "bool"
}
],
"action": "",
"property": "",
"from": "",
"to": "",
"reg": false,
"x": 700,
"y": 2800,
"wires": [
[
"4acb89a30b69f58e"
]
]
},
{
"id": "44496964eaa7257e",
"type": "inject",
"z": "2e6686c4918f199d",
"name": "",
"props": [
{
"p": "payload"
},
{
"p": "topic",
"vt": "str"
}
],
"repeat": "",
"crontab": "",
"once": true,
"onceDelay": 0.1,
"topic": "",
"payload": "false",
"payloadType": "bool",
"x": 170,
"y": 2910,
"wires": [
[
"4acb89a30b69f58e"
]
]
},
{
"id": "086a722972596909",
"type": "function",
"z": "2e6686c4918f199d",
"name": "actual action goes on",
"func": "\nreturn msg;",
"outputs": 1,
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 740,
"y": 2880,
"wires": [
[]
]
},
{
"id": "c7a27394.057878",
"type": "ui_group",
"name": "CHART",
"tab": "54e197d8.7f7fe8",
"order": 2,
"disp": false,
"width": "9",
"collapse": false
},
{
"id": "54e197d8.7f7fe8",
"type": "ui_tab",
"name": "Home",
"icon": "dashboard",
"order": 1,
"disabled": false,
"hidden": false
}
]
I hope you get the idea.
