Objective　High　performance　thin　film　polarizer　has　become　one　of　the　research　hotspots　in　the　research　of　LCD　display　technology.　Compared　with　wire　grid　polarizer　on　the　market,　it　achieves　a　thickness　of　less　than　μm　while　maintaining　high　birefringence　and　being　an　important　component　of　high　contrast　ultra-thin　LCD　displays.　Azo　dye　(AD)　anisotropic　materials　are　considered　ideal　materials　for　high-performance　thin　film　polarizers　used　in　ultra-thin　LCD　displays　due　to　their　photoinduced　steering　and　strong　anisotropic　absorption　characteristics,　which　have　advantages　like　simple　preparation,　thin　thickness,　and　large　dichroism　ratio　(DR).　Methods　This　article　builds　an　FDTD　model　of　AD　thin　film　polarizer　for　comparing　experimental　absorption　spectrum　and　simulated　absorption　spectrum　(Fig.3).　Four　possible　models　were　constructed　based　on　the　different　alignments　of　AD　molecules　in　the　thin　film　layer　and　the　GMR　unit,　and　their　DR　differences　were　compared　in　Fig.4.　Then,　we　explore　the　effect　on　DR　performance　with　the　different　heights　of　GMR　unit　and　different　thicknesses　on　thin　film　layer　(Fig.6　and　Fig.7).　Results　and　Discussions　This　paper　introduces　a　nano-GMR　structure　upon　the　AD　film　layer,　combining　molecular-level　anisotropic　absorption　and　structural-level　strong　resonant　absorption　to　achieve　dual　absorption　enhancement　of　the　AD　thin　film　polarizer.　By　optimizing　the　nano-GMR　unit　and　thin　film　layer　thickness,　an　average　DR　improvement　of　83.3%　was　achieved　compared　to　a　single　150　nm　AD　film　polarizer,　where　the　minimum　and　maximum　values　reached　40.5%　and　149.5%,　respectively,　while　the　overall　thickness　of　the　polarizer　was　only　220　nm.　This　study　provides　ideas　for　the　design　and　preparation　of　high-performance　AD　thin　film　polarizer,　which　is　of　great　significance　in　the　development　of　high　contrast　ultra-thin　LCDs.　Conclusions　This　paper　introduces　the　nano-GMR　unit　into　the　AD4455　thin　film　polarizer,　which　generates　molecular　anisotropic　absorption　of　linearly　polarized　light　and　enhanced　absorption　of　GMR　structure.　The　results　showed　that　by　placing　nano-GMR　unit　upon　an　AD　thin　film　polarizer,　DR　performance　has　an　average　improvement　of　54.4%　in　the　wavelength　range　of　400-550　nm　compared　to　a　single　AD4455　thin　film　polarizer,　where　the　minimum　and　maximum　value　reach　38.5%　and　74.4%,　respectively.　After　further　optimization　for　the　thickness　of　the　thin　film　layer,　the　final　average　DR　improvement　reached　83.3%,　where　the　minimum　and　maximum　values　reached　40.5%　and　149.5%,　respectively.　The　introduction　of　this　structure　significantly　enhances　the　performance　of　AD-based　thin　film　polarizer,　which　is　of　great　significance　for　the　integration　of　high-performance　thin　film　polarizers　in　ultra-thin　LCD　displays.　©　2025　Science　Press.　All　rights　reserved.