Kiem tra LCD - phat hien dead pixel, stuck pixel va backlight bleed
Kiem tra LCD la cach nhanh de xac nhan man hinh khong co pixel chet, pixel ket o mot mau, hoac ro ri anh sang tu backlight - ba loi hien thi xuat hien nhieu nhat tren man hinh laptop, monitor hoac dien thoai truoc hoac sau khi mua. Kiem tra nay chay truc tiep trong trinh duyet: moi mau lap day toan bo viewport, do do bat ky pixel nao khong hien dung mau do se lap tuc xuat hien nhu mot diem hoac duong co mau khac.
Last reviewed: 2026-05-18
| Thuoc tinh | Gia tri |
|---|---|
| Dinh dang | Web (Chrome, Edge, Firefox, Safari) - khong cai dat, khong tai khoan |
| Mau kiem tra | Sau: do, xanh la, xanh duong, den, trang, vang |
| Che do | Toggle toan man hinh - viewport day du, mot mau moi man |
| Reset | Nut reset quay ve bang chon mau bat cu luc nao |
| Quyen rieng tu | Khong upload, khong du lieu nao roi khoi trinh duyet |
| Cong cu trien khai | https://freetoolonline.com/device-test-tools/lcd-test.html |
Cach chay bai kiem tra LCD nay
Mo https://freetoolonline.com/device-test-tools/lcd-test.html va cac buoc la: (1) Click vao mot trong sau nut mau - do, xanh la, xanh duong, den, trang, vang. Man hinh se duoc lap day hoan toan boi mau ban chon. (2) Bat toggle toan man hinh neu viewport trinh duyet chua bao phu toan bo man hinh vat ly - che do nay toi da hoa khu vuc kiem tra, do do pixel o canh man hinh cung duoc kiem tra. (3) Quan sat bang mat khu vuc hien thi: pixel chet xuat hien la diem den tren mau sang; stuck pixel xuat hien la diem co dinh o mot mau ngay ca khi mau nen thay doi; backlight bleed xuat hien la khu vuc sang hon o goc hoac canh khi man hinh phu day mau den. (4) Nut reset quay ve bang chon mau khi ban muon doi mau kiem tra hoac ket thuc bai test. Bai test nay hoat dong tot nhu nhau tren laptop, monitor desktop, tablet va dien thoai - mau va toggle toan man hinh giong nhau o moi thiet bi.
Bai test phat hien gi va khong phat hien gi
Bai test nay phat hien ba loai loi hien thi nhin thay duoc bang mat thuong trong qua trinh kiem tra: (a) Dead pixel - pixel hoan toan khong sang, nhin thay la diem den tren mau sang va khong nhin thay tren mau den. (b) Stuck pixel - pixel ket sang o mot sub-pixel (do, xanh la hoac xanh duong), nhin thay la diem co dinh o mau do ngay ca khi mau nen thay doi. (c) Backlight bleed - ro ri anh sang tu panel LED phia sau man hinh, ro nhat khi hien thi mau den day o phong toi. Bai test nay khong do do chinh xac mau gamma, color gamut (sRGB / Adobe RGB / DCI-P3), can chinh white-point, hoac thoi gian phan ung - viec do can colorimeter hoac thiet bi do chuyen dung. Bai test cung khong bao cao tu dong so luong pixel loi (khong co phat hien may); nguoi dung kiem tra bang mat.
Khi nao bai test LCD nay huu ich nhat
Bon kich ban pho bien nhat: (1) Truoc khi mua - tai cua hang hoac tren marketplace hang qua su dung, bai test nay kiem tra man hinh trong vai giay khong can cai dat phan mem. Kiem tra ngay luc nhan hang (trong cua so doi tra) la thoi diem tot nhat de phat hien dead pixel co the tro thanh van de suot doi cua man hinh. (2) Sau khi mo hop laptop hoac monitor moi - nhieu nha san xuat co chinh sach doi tra dead pixel theo so luong; kiem tra ngay sau khi mo hop de van trong khoang thoi gian cua chinh sach. (3) Chan doan sau roi hoac va dap - LCD bi hong do va dap thuong xuat hien duong doc stuck pixel hoac vung chet; bai test xac nhan loi nam o panel hay chi o cap LCD. (4) Sau bao tri hoac thay panel - xac nhan panel thay the khong co loi moi te hon panel goc.
Khac biet giua test LCD vs test LED vs test OLED
Doi voi kiem tra muc pixel (dead, stuck, backlight bleed), su khac biet giua LCD, LED-LCD va OLED hau nhu khong lien quan: bat ky panel nao hien thi mau bang luoi pixel deu se hien thi loi pixel trong cung mot bai test. Cai khac biet la dac diem backlight: panel LCD voi backlight CCFL (hiem nay) hoac LED (da so laptop va monitor hien dai) deu co the hien thi backlight bleed o mau den; OLED khong co backlight (moi pixel tu sang), do do se khong hien thi backlight bleed - neu ban thay vung sang hon o mau den tren OLED, kha nang la van de uniformity o sub-pixel, khong phai backlight bleed. Doi voi bai test mau co ban - moi pixel co the hien thi do, xanh la, xanh duong, den, trang va vang chinh xac hay khong - bai test nay hoat dong tot nhu nhau tren moi loai panel.
Dien giai ket qua truoc khi yeu cau bao hanh
Truoc khi yeu cau bao hanh hoac doi tra dua tren ket qua test, hay tai lieu hoa ky luong: (1) Chup man hinh bang camera dien thoai khi bai test mau dang hien - dead pixel va stuck pixel xuat hien nhu cac diem co mau khac trong anh. (2) Dem so luong pixel loi theo tung mau - nhieu nha san xuat co nguong (vi du ZeroBrightDot, Premium IPS) truoc khi chap nhan yeu cau; biet so luong giup quyet dinh xem chinh sach nha san xuat co chap nhan hay khong. (3) Ghi lai vi tri pixel tren man hinh - da so nha san xuat phan biet giua pixel o vung hien thi chinh va pixel o canh. (4) Kiem tra chinh sach dead pixel cu the cua nha san xuat truoc khi yeu cau - chinh sach khac nhau giua Dell, Lenovo, HP, Apple, Samsung, LG va ASUS, va khac nhau hon giua san pham gaming voi san pham chuan. Bai test nay cung cap bang chung truc quan; chinh sach nha san xuat quyet dinh bang chung do co du de yeu cau duoc chap nhan hay khong.
Frequently Asked Questions
Bai test LCD nay co thuc su mien phi va khong dang ky khong?
Co - https://freetoolonline.com/device-test-tools/lcd-test.html chay truc tiep trong trinh duyet. Khong upload file, khong yeu cau email, khong dang ky tai khoan. Bai test duoc thuc hien bang cach hien thi mau tren viewport trinh duyet - khong co du lieu nao gui den server vi khong co gi de gui.
Tai sao phai sau mau - den va trang khong du a?
Sau mau kiem tra cac loai loi khac nhau: den hien thi dead pixel (diem sang) va backlight bleed (vung sang hon); trang hien thi stuck pixel co mau; do, xanh la va xanh duong kiem tra tung sub-pixel rieng le vi pixel LCD gom ba sub-pixel rieng (RGB); vang ket hop do va xanh la va huu ich de phat hien sub-pixel xanh duong bi ket. Chi su dung den va trang se bo lo stuck pixel ket o mau co ban.
Su khac biet giua dead pixel va stuck pixel la gi?
Dead pixel la pixel khong sang - tat ca ba sub-pixel RGB cua no deu chet. Pixel nay xuat hien la diem den tren mau sang va khong xuat hien tren man hinh den. Stuck pixel la pixel ket hien thi mot sub-pixel - vi du sub-pixel do luon sang, do do pixel xuat hien mau do tren man hinh trang va van mau do tren man hinh den (nhin thay la diem do sang). Stuck pixel doi khi co the duoc "sua" bang cach hien thi video doi mau nhanh trong vai gio; dead pixel thong thuong khong sua duoc neu khong thay panel.
Ket qua bai test nay co dung de yeu cau bao hanh khong?
Bang chung truc quan tu bai test nay (anh chup dien thoai hoac screen recording) co the dung de ho tro yeu cau bao hanh, nhung viec chap nhan phu thuoc vao chinh sach cua nha san xuat. Mot so chinh sach dead pixel pho bien: Dell Premium Panel Guarantee chap nhan yeu cau cho mot hoac nhieu dead pixel; Apple thay doi theo san pham va nam; Samsung va LG thuong yeu cau nhieu pixel loi truoc khi chap nhan doi tra. Luon kiem tra tai lieu bao hanh san pham cua ban truoc khi yeu cau.
Bai test nay co sua duoc stuck pixel khong?
Bai test nay chi hien thi mau de phat hien - khong co tinh nang sua pixel o day. De thu sua stuck pixel, dung video YouTube tu khoa "stuck pixel fix" hien thi mau doi nhanh trong vai gio; ky thuat nay doi khi giai phong duoc sub-pixel ket nhung khong dam bao. Dead pixel thong thuong khong co cach sua bang phan mem.