Difference Between Screen Protector & Screen "Filter"?

It depends on the screen and purpose.

For the most part, they are one in the same. The description is inter-changeable.

However, some claim to be 'privacy' filters as well.
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Systems by SmartEyeball
OS
8 Pro x64
CPU
i7 3770K 4.6GHz
Motherboard
ASUS P8Z77 WS
Memory
16GB G.Skill Trident X 2666mhz
Graphics Card(s)
x2 EVGA 780 Ti Superclocked SLI
Sound Card
SB X-FI Surround 5.1 PRO USB / ATH-AD900 Headphones
Monitor(s) Displays
x3 Dell U2410 / 58" Samsung
Screen Resolution
5760*1200/ 1920*1200
Hard Drives
2x Intel 520 240GB (RAID 0) * 2x WD Caviar Blacks 2TB (RAID 0) * 2TB WD Caviar Black * Sony Optirac DVD
PSU
Silverstone Strider Evolution 1200W
Case
Thermaltake Level 10 GT Snow Edition
Cooling
Noctua NH-D14
Keyboard
Topre Realforce // Ducky Shine MX Black // Filco Ninja TKL
Mouse
Thermaltake Theron (Highly Recommended) + Razer Imperator
Antivirus
MSE
Browser
IE, FF, WaterFox
Other Info
GT Extreme V2 Sim Racing Cockpit + 40" LCD and K/B Mouse stand ▼
Fanatec CSR Elite Wheel + Clubsport V1 Pedals + CSR shifter/7G-H ▼Saitek X52 Pro ▼ TrackIR 5 Pro
Buttkicker v2 Seat Rumbler with Dedicated 5.1 and Sub Woofer attached to frame ▼
=
Bloody Big Grin
There is a small difference between them.
A Screen Protector will be fixed to the screen like a film (can be removed if required, though not frequently).
Screen Protector.jpg

A Screen Filter will not be fixed on to the screen, but hang in front of the screen and can be removed whenever required.
Screen Filter.jpg
 

My Computer

Computer type
Laptop
Computer Manufacturer/Model Number
HP EliteBook 8530w Mobile Workstation
OS
Windows 7 Ultimate x64 (XP, 98SE, 95, 3.11, DOS 7.10 on VM) + Ubuntu 10.04 LTS Lucid Lynx
CPU
Intel Core 2 Duo Processor P8600 (2.40 GHz, 3 MB L2 cache)
Motherboard
Mobile Intel PM45 Express Chipset ICH9M-Enhanced
Memory
4GB 800 MHz DDR2 SDRAM
Graphics Card(s)
ATI Mobility FireGL V5700 with 256 MB
Sound Card
SoundMAX Integrated Digital HD Audio
Monitor(s) Displays
15.4-inch WXGA anti-glare (1280 x 800 resolution)
Screen Resolution
1280 x 800
Hard Drives
500GB + 1TB
Mouse
Synaptics PS/2 Port Touchpad, USB Mouse
Internet Speed
4 Mbps
Antivirus
MSE
Browser
Firefox, Chrome, IE
Other Info
Authentec AES2810 Fingerprint Reader
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