B\u1ed9 hi\u1ec3n th\u1ecb c\u00f3 r\u1ea5t nhi\u1ec1u ch\u1ee7ng lo\u1ea1i. Nh\u01b0ng trong tr\u01b0\u1eddng h\u1ee3p c\u1ed1 \u0111\u1ecbnh th\u00ec th\u01b0\u1eddng d\u00f9ng b\u1ed9 hi\u1ec3n th\u1ecb \u0111\u00e8n \u00e2m c\u1ef1c – CRT (cathode – ray tube). V\u00e0 ng\u01b0\u1eddi ta th\u01b0\u1eddng nh\u1eafc t\u1edbi hai t\u00ednh n\u0103ng quan tr\u1ecdng c\u1ee7a lo\u1ea1i b\u1ed9 hi\u1ec3n th\u1ecb n\u00e0y: (1) \u0110\u1ed9 ph\u00e2n gi\u1ea3i v\u00e0 (2) Kho\u1ea3ng c\u00e1ch th\u00e0nh ph\u1ea7n \u1ea3nh.<\/p>\n\n\n\n
Kho\u1ea3ng c\u00e1ch th\u00e0nh ph\u1ea7n \u1ea3nh l\u00e0 kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c \u0111i\u1ec3m s\u00e1ng nh\u1ecf nh\u1ea5t c\u00f3 h\u00ecnh \u1ea3nh tr\u00ean m\u00e0n h\u00ecnh. Nh\u1eefng \u0111i\u1ec3m s\u00e1ng nh\u1ecf nh\u1ea5t n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 th\u00e0nh ph\u1ea7n \u1ea3nh. Th\u01b0\u1eddng ng\u01b0\u1eddi ta kh\u00f4ng c\u0103n c\u1ee9 v\u00e0o \u0111\u1ed9 l\u1edbn nh\u1ecf c\u1ee7a th\u00e0nh ph\u1ea7n \u1ea3nh, m\u00e0 coi kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c \u0111i\u1ec3m s\u00e1ng nh\u1ecf nh\u1ea5t c\u1ee7a h\u00ecnh \u1ea3nh tr\u00ean m\u00e0n h\u00ecnh l\u00e0 m\u1ed9t ch\u1ec9 ti\u00eau t\u00ednh n\u0103ng quan tr\u1ecdng. Trong b\u1ed9 hi\u1ec3n th\u1ecb m\u00e0u, c\u00e1c th\u00e0nh ph\u1ea7n \u1ea3nh c\u01a1 b\u1ea3n \u0111\u01b0\u1ee3c t\u1ea1o th\u00e0nh b\u1edfi ba \u0111i\u1ec3m \u0111\u1ecf, xanh, lam. C\u00f2n kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c \u0111i\u1ec3m h\u00ecnh quang \u0111\u1ed3ng m\u00e0u th\u00ec g\u1ecdi l\u00e0 kho\u1ea3ng c\u00e1ch th\u00e0nh ph\u1ea7n \u1ea3nh. Kho\u1ea3ng c\u00e1ch c\u00e0ng nh\u1ecf th\u00ec h\u00ecnh \u1ea3nh hi\u1ec3n th\u1ecb c\u00e0ng nhi\u1ec1u v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng c\u0169ng c\u00e0ng cao. Th\u1ebf nh\u01b0ng, kho\u1ea3ng c\u00e1ch nh\u1ecf th\u00ec kh\u00f3 ch\u1ebf t\u1ea1o v\u00e0 gi\u00e1 ti\u1ec1n c\u1ee7a b\u00f3ng \u0111\u00e8n h\u00ecnh c\u00e0ng cao. Hi\u1ec7n nay, quy c\u00e1ch th\u01b0\u1eddng g\u1eb7p c\u1ee7a kho\u1ea3ng c\u00e1ch b\u00f3ng \u0111\u00e8n h\u00ecnh trong b\u1ed9 hi\u1ec3n th\u1ecb l\u00e0 0,39 ~ 0,25 mm.<\/p>\n\n\n\n
\u0110\u1ed9 ph\u00e2n gi\u1ea3i l\u00e0 n\u00f3i tr\u00ean m\u00e0n h\u00ecnh hi\u1ec3n th\u1ecb c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb \u0111\u01b0\u1ee3c bao nhi\u00eau th\u00e0nh ph\u1ea7n \u1ea3nh. \u0110\u1ed9 ph\u00e2n gi\u1ea3i c\u1ee7a m\u1ed9t b\u1ed9 hi\u1ec3n th\u1ecb \u0111\u01b0\u1ee3c t\u1ea1o th\u00e0nh b\u1edfi \u0111\u1ed9 ph\u00e2n gi\u1ea3i hi\u1ec3n th\u1ecb ngang v\u00e0 \u0111\u1ed9 ph\u00e2n gi\u1ea3i hi\u1ec3n th\u1ecb d\u1ecdc. V\u00ed d\u1ee5 \u0111\u1ed9 ph\u00e2n gi\u1ea3i l\u00e0 640 x 480, th\u00ec \u0111\u1ed9 ph\u00e2n gi\u1ea3i ngang l\u00e0 640 \u0111i\u1ec3m, c\u00f2n \u0111\u1ed9 ph\u00e2n gi\u1ea3i d\u1ecdc l\u00e0 480 \u0111i\u1ec3m. \u0110\u1ed9 ph\u00e2n gi\u1ea3i c\u1ee7a b\u1ed9 hi\u1ec3n th\u1ecb m\u00e0u 14\u201d c\u00f3 th\u1ec3 \u0111\u1ea1t 1024 x 768; 15 ins\u01a1 th\u00ec th\u01b0\u1eddng \u0111\u1ecbnh v\u1ecb l\u00e0 1280 x 1024; c\u00f3 b\u1ed9 hi\u1ec3n th\u1ecb \u0111\u1ed9 ph\u00e2n gi\u1ea3i \u0111\u1ea1t t\u1edbi 1600 x 1280. \u0110\u1ed9 ph\u00e2n gi\u1ea3i c\u00e0ng cao th\u00ec s\u1ed1 l\u01b0\u1ee3ng th\u00e0nh ph\u1ea7n hi\u1ec3n th\u1ecb \u1edf m\u1ed7i h\u00e0ng c\u00e0ng nhi\u1ec1u, k\u00ed t\u1ef1 v\u00e0 h\u00e0nh \u1ea3nh c\u00e0ng ho\u00e0n ch\u1ec9nh, s\u1eafc n\u00e9t. Th\u00f4ng th\u01b0\u1eddng khi \u0111\u00e3 bi\u1ebft kho\u1ea3ng c\u00e1ch th\u00e0nh ph\u1ea7n \u1ea3nh v\u00e0 \u0111\u1ed9 l\u1edbn c\u1ee7a m\u00e0n h\u00ecnh, ta c\u00f3 th\u1ec3 t\u00ednh \u0111\u01b0\u1ee3c \u0111\u1ed9 ph\u00e2n gi\u1ea3i c\u1ee7a b\u1ed9 hi\u1ec3n th\u1ecb v\u00e0 s\u1ed1 l\u01b0\u1ee3ng th\u00e0nh ph\u1ea7n \u1ea3nh.<\/p>\n\n\n\n
Trong th\u1ef1c t\u1ebf khi s\u1eed d\u1ee5ng, \u0111\u1ed9 ph\u00e2n gi\u1ea3i c\u1ee7a b\u1ed9 hi\u1ec3n th\u1ecb c\u1ea7n ph\u1ea3i \u0111\u01b0\u1ee3c c\u00e0i \u0111\u1eb7t. Khi c\u00e0i \u0111\u1eb7t kh\u00f4ng nh\u1ea5t thi\u1ebft ph\u1ea3i \u0111\u1eb7t \u1edf \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao nh\u1ea5t c\u1ee7a b\u1ed9 hi\u1ec3n th\u1ecb. Th\u1ef1c t\u1ebf s\u1eed d\u1ee5ng, s\u1ef1 c\u00e0i \u0111\u1eb7t \u0111\u1ed9 ph\u00e2n gi\u1ea3i c\u1ee7a b\u1ed9 hi\u1ec3n th\u1ecb c\u00f2n ph\u1ea3i th\u1ef1c hi\u1ec7n th\u00f4ng qua vi\u1ec7c l\u1eafp ph\u1ed1i h\u1ee3p \u0111\u1ed3ng b\u1ed9 b\u1ed9 hi\u1ec3n th\u1ecb (card m\u00e0n h\u00ecnh). Card m\u00e0n h\u00ecnh c\u00f3 th\u1ec3 l\u1eafp \u0111\u1eb7t tr\u00ean \u0111\u1ed9 ph\u00e2n gi\u1ea3i quy \u0111\u1ecbnh c\u1ee7a m\u00e0n h\u00ecnh; c\u0169ng c\u00f3 th\u1ec3 l\u1eafp \u0111\u1eb7t th\u1ea5p m\u1ed9t ch\u00fat. N\u1ebfu card m\u00e0n h\u00ecnh b\u1ea3n th\u00e2n kh\u00f4ng th\u1ec3 l\u1eafp \u0111\u1eb7t \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao th\u00ec m\u00e0n h\u00ecnh c\u00f3 \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao \u0111\u1ebfn m\u1ea5y c\u0169ng kh\u00f4ng th\u1ec3 ph\u00e1t huy t\u00e1c d\u1ee5ng.<\/p>\n\n\n\n
Th\u00e0nh ph\u1ea7n \u1ea3nh th\u1ef1c t\u1ebf th\u00ec kh\u00f4ng th\u1ec3 ki\u1ec3m tra ch\u00ednh x\u00e1c, c\u00f3 th\u1ec3 b\u1eb1ng k\u00ednh hi\u1ec3n vi chuy\u00ean d\u00f9ng c\u1ee7a ph\u00f2ng th\u00ed nghi\u1ec7m th\u00ec m\u1edbi c\u00f3 \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 chu\u1ea9n x\u00e1c. Th\u1ebf nh\u01b0ng ng\u01b0\u1eddi ti\u00eau d\u00f9ng c\u00f3 th\u1ec3 ki\u1ec3m tra qua catal\u00f4 v\u00e0 quan s\u00e1t k\u1ef9 m\u00e0n h\u00ecnh \u0111\u1ec3 t\u00ecm hi\u1ec3u kho\u1ea3ng c\u00e1ch th\u00e0nh ph\u1ea7n \u1ea3nh. V\u00ed d\u1ee5 khi hi\u1ec3n th\u1ecb ch\u1eef H\u00e1n ph\u1ed3n th\u1ec3, ta quan s\u00e1t n\u00e9t ch\u1eef xem th\u00e0nh ph\u1ea7n \u1ea3nh c\u00f3 s\u1eafc n\u00e9t kh\u00f4ng, khi hi\u1ec3n th\u1ecb h\u00ecnh \u1ea3nh ta xem \u0111\u01b0\u1eddng n\u00e9t c\u1ee7a h\u00ecnh c\u00f3 ho\u00e0n ch\u1ec9nh, \u1ea3nh c\u00f3 r\u00f5 n\u00e9t kh\u00f4ng. C\u00f2n \u0111\u1ed9 ph\u00e2n gi\u1ea3i l\u1edbn nh\u1ecf ch\u1ec9 khi l\u1eafp card m\u00e0n h\u00ecnh v\u00e0o, c\u00f3 th\u1ec3 ki\u1ec3m tra b\u1eb1ng ph\u1ea7n m\u1ec1m v\u00e0 c\u00f3 th\u1ec3 c\u0103n c\u1ee9 v\u00e0o nhu c\u1ea7u v\u00e0 ti\u1ebfn h\u00e0nh l\u1eafp \u0111\u1eb7t. (Ng\u00e0y nay ng\u01b0\u1eddi ta d\u00f9ng m\u00e0n h\u00ecnh tinh th\u1ec3 l\u1ecfng thay th\u1ebf lo\u1ea1i m\u00e0n h\u00ecnh CRT, c\u00e1c kh\u00e1i ni\u1ec7m v\u1ec1 kho\u1ea3ng c\u00e1ch ph\u1ea7n t\u1eed \u1ea3nh v\u00e0 \u0111\u1ed9 ph\u00e2n gi\u1ea3i c\u0169ng t\u01b0\u01a1ng t\u1ef1 nh\u01b0 \u1edf m\u00e0n h\u00ecnh CTR – btv GD).<\/p>\n\n\n\n
T\u1eeb kh\u00f3a: Kho\u1ea3ng c\u00e1ch th\u00e0nh ph\u1ea7n \u1ea3nh; \u0110\u1ed9 ph\u00e2n gi\u1ea3i; Card m\u00e0n h\u00ecnh.<\/p>\n","protected":false},"excerpt":{"rendered":"
B\u1ed9 hi\u1ec3n th\u1ecb c\u00f3 r\u1ea5t nhi\u1ec1u ch\u1ee7ng lo\u1ea1i. Nh\u01b0ng trong tr\u01b0\u1eddng h\u1ee3p c\u1ed1 \u0111\u1ecbnh th\u00ec th\u01b0\u1eddng d\u00f9ng b\u1ed9 hi\u1ec3n th\u1ecb \u0111\u00e8n \u00e2m c\u1ef1c – CRT (cathode – ray tube). V\u00e0 ng\u01b0\u1eddi ta th\u01b0\u1eddng nh\u1eafc t\u1edbi hai t\u00ednh n\u0103ng quan tr\u1ecdng c\u1ee7a lo\u1ea1i b\u1ed9 hi\u1ec3n th\u1ecb n\u00e0y: (1) \u0110\u1ed9 ph\u00e2n gi\u1ea3i v\u00e0 (2) Kho\u1ea3ng c\u00e1ch th\u00e0nh […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[13],"tags":[],"class_list":["post-10276","post","type-post","status-publish","format-standard","hentry","category-tin-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/10276","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=10276"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/10276\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=10276"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=10276"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=10276"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}