Toi uu hinh anh cho man hinh LCD

Phai danh phan lon thoi gian cua minh lam viec tren may tinh, ban cam thay qua met moi, va khong thoai mai khi lam viec voi man hinh CRT cu ki. So huu man hinh LCD cho cong viec cua minh khong phai la yeu cau qua cao boi gia ca va chung loai man hinh LCD rat da dang, phong phu, phu hop voi moi yeu cau cua nguoi su dung.

Tuy nhien, de hieu chinh man hinh LCD sao cho thich hop, toi uu nhat thi lai hoan toan khac biet so voi man hinh CRT, mac du nhung thiet lap cau hinh cung khong co nhieu khac biet lam so voi CRT. Bai viet nay se giup ban doc toi uu hinh anh, dat chat luong tot nhat voi man hinh LCD.

Cai dat driver cho card do hoa moi nhat

Truoc het, de dat chat luong hinh anh tot nhat nhu mong muon, mot phan rat lon con phu thuoc vao card do hoa va chipset cua may tinh. Hay dam bao chac chan ban da cap nhat trinh dieu khien (driver) cho card man hinh moi nhat, do la cach don gian va nhanh nhat de toi uu chat luong hinh anh. De nang cap, hay tai driver moi nhat ve tu trang chu cua nha san xuat va thuc thi file cai dat (.exe).

Trong mot so truong hop, ban can phai thuc hien cai dat bang tay. Trong Windows XP, nhan chuot phai vao My Computer, chon Properties, va chon Hardware, Device Manager, va nhan dup vao muc "Display adapters". Tiep theo, lua chon Update Driver trong the Driver.

Luu y: Mot so trinh dieu khien yeu cau khoi dong lai PC. Ban cung khong nen tai cac ban beta cua nhung trinh dieu khien nay. Chung dang duoc thu nghiem va rat co the gay ra nhung loi khong mong muon.

Chuc nang ClearType trong Windows XP.

Doc van ban ro net hon voi ClearType

Windows XP ho tro cong nghe ClearType cho phep lam phong chu hien thi tron tru va ro net hon doi voi cac van ban tren man hinh LCD. De su dung cong nghe nay, hay nhan Appearance -> Display Properties -> chon Effects, va danh dau vao lua chon Use the following method to smooth screen fonts, nhan vao ClearType tu menu do xuong. Nhan OK de hoan thanh.

Cap nhat DirectX moi nhat

DirectX la mot cong nghe cua Windows nham nang cao kha nang do hoa va am thanh. Hay cap nhat phien ban DirectX moi nhat ( DirectX 9.0c). Ban co the download de dang phien ban DirectX moi nhat tai trang chu cua Microsoft. De biet minh dang su dung phien ban DirectX nao, hay nhan Start->Run, va go dxdiag va nhan Enter. Tiep theo nhan vao tab System de xem phien ban ban dang dung.

Do phan giai man hinh

Trong man hinh CRT, do phan giai man hinh la nhung con so dots, pixel, de bieu thi hinh anh tren man hinh. Ban co the tang do phan giai len cao hon, hoac chinh xuong thap tuy theo y minh ma khong lam anh huong toi chat luong hinh anh. Tuy nhien, dieu nay lai hoan toan khong dung voi LCD. Man hinh LCD se hien thi dep nhat va dem lai chat luong cao nhat chi voi mot do phan giai chuan.

Hau het cac man hinh LCD 15" deu co do phan giai chuan 1024x768, trong khi do, nhung man hinh 17" hoac 19" cho do phan giai toi uu la 1280x1024. Khi dieu chinh do phan giai chuan nay se lam giam chat luong hinh anh, kich thuoc anh thay doi, hoac dan toi meo anh, mat pixel... Tuy nhien, co mot ngoai le la khi tang hay giam do phan giai chi bang mot nua do phan giai chuan thi chat luong hinh anh van kha tot. Chang han, do phan giai nguyen thuy la 1600x1200 la khi giam xuong 800x600 thi chat luong hinh anh dat chat luong tot va khong bi meo.

Chat luong mau

Man hinh cang hien thi duoc nhieu mau thi do trung thuc cua hinh anh cang cao. Hau het PC deu yeu cau ho tro thiet lap mau cao nhat, thuong la che do 32 bit mau. Nhung neu dang su dung do hoa tich hop thi dieu nay co the lam giam hieu nang may tinh, hay giam luong mau xuong con 24 bit hoac 16 bit de tang toc cho he thong.

Tan so lam tuoi (Refresh rate) va thoi gian dap ung (response time)

Man hinh CRT thuong bi nhap nhay, gay moi mat va kho chiu cho nguoi su dung, nguyen nhan co the la do dat tan so lam tuoi qua thap. Loi khuyen huu ich cho nguoi su dung la nen dat do phan giai ma man hinh ho tro tan so lam tuoi toi thieu o muc 72 Hz de tranh moi mat.

Tuy nhien, voi man hinh LCD, man hinh bi nhap nhay khong phai la van de boi thiet bi nay khong lam tuoi toan bo man hinh ma chi thay doi diem anh. Tan so lam tuoi chi o 40 Hz cho toi 60 Hz doi voi man hinh LCD cung du tot. Mot van de can khac can phai chu y doi voi nguoi su dung man hinh LCD ma dac biet la cac game thu lai la thoi gian dap ung cua man hinh. Tan so dap ung la khoang thoi gian can thiet de mot diem anh can phai duoc chuyen tu den sang trang va lai chuyen sang den. Nhung man hinh LCD cu thuong co thoi gian dap ung cham hon 20 ms nhung gan day nhung man hinh LCD moi co thoi gian dap ung nhanh hon rat nhieu, man hinh cao cap co thoi gian dap ung la 12 ms hoac thap hon.

Tinh chinh bang cac nut dieu khien

Khi su dung man hinh LCD hoac CRT, dung ngai mo mam cac nut dieu chinh cua no. Nhung thiet lap thich hop co the dem lai hinh anh sac net va tuyet voi hon rat nhieu so voi thiet lap san tu nha san xuat.

Man hinh LCD thuong de dang dieu chinh hon nhieu so voi CRT. Rat hiem khi ban phai dieu chinh man anh sang ben trai, ben phai, di len hay xuong duoi... giong nhu CRT. Mac du vay, man hinh LCD cung ho tro nut bam hoac thiet lap tu dieu chinh vi tri cua man anh. Cuoi cung, man hinh LCD thuong yeu cau it tinh chinh mau sac hay do tuong phan khi lua chon o do phan giai chuan.

Do sang va do tuong phan

Thiet lap do sang quan ly cuong do sang cua man hinh. Man hinh LCD thuong sang hon man hinh CRT, vi vay tang do sang co the la khong can thiet va dem lai ket qua khong mong muon. Dieu chinh do tuong phan su dung bieu do mau xam nhu cac chuong trinh nhu DisplayMate de dem lai kha nang the hien mau xam tot nhat. Man hinh LCD thuong gay mat nhung chi tiet toi o cuoi dai mau nay.

Sac thai va do am cua mau

Co hai loai nguon sang khac nhau la loai nguon sang trang-xanh lanh va nguon sang trang-do nong. Hau het cac man hinh deu dua ra it nhat 3 lua chon va sac thai hoac do am cua mau dua theo nguon sang vi tri dat man hinh. Nhung thiet lap nay duoc dat nhan la Mode1 , Mode 2, Mode 3 tuong ung voi Cao, Trung binh va Thap. Ngoai ra, cac nha san xuat thuong dat do am cua mau sac dua theo do Kelvin(K). Thong thuong thiet lap chuan la 9300K hoac trung tinh voi 6500K va sac thai hoi do voi 5000K. Rat nhieu loai LCD cho phep nguoi su dung tinh chinh mau sac bang cach can bang 3 mau co ban do, xanh da troi, va xanh la cay.

Chuan doan benh cho LCD

Man hinh LCD thuong de duy tri va bao duong hon man hinh CRT. Tuy vay, truoc khi mua sam va su dung ban can chu y toi nhung 2 "can benh" kha pho bien cua LCD:

Man hinh trong

Neu den nguon van sang ma lai khong hien thi hinh anh, hay kiem tra ket noi giua man hinh LCD va PC de kiem tra chac chan rang man hinh van nhan duoc tin hieu video. Neu cap tin hieu video van duoc cam ca hai dau, hay thu ket noi man hinh khac vao PC de dam bao rang cap hoac card do hoa van hoat dong tot. Neu man hinh thu hai hien thi tot, rat co the man anh cua LCD da bi hong. Neu man hinh LCD van con thoi gian dang bao hanh hay dem ra trung tam bao hanh.

Diem chet tren man hinh LCD

Hau het cac nha san xuat man hinh LCD deu khong the cam doan rang khong co nhung diem chet trong cac san pham cua ho. Nhung diem chet nay thuong gay kho chiu cho nguoi su dung nhung so diem anh chet cho phep cua moi man hinh la tu 3 cho den 10 diem chet. Chinh vi vay, kha nang doi man hinh moi khi co diem chet la rat kho khan. Do do, truoc khi mua man hinh LCD, ban hay bat man hinh len va quan sat that ki xem co diem chet nao khong truoc khi mua hang.

Minh Phuc (Theo PCWorld)