Tham khảo tài liệu 'tiếng anh chuyên ngành công nghệ thông tin part 3', công nghệ thông tin, tin học văn phòng phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Lesson 2 Input output devices Vocabulary sharp adj sắc nét nhọn density n mật độ cathode ray tube n ống tia âm cực đèn hình electron beam n chùm tia điện tử continuous sequence n trình tự liên tục flicker v nhấp nháy eliminate v khử loại bỏ bit-mapped adj ánh xạ bit electron gun n súng điện tử intensity n cường độ display adaptor n bộ thích ứng hình ảnh liquid-crystal display n màn hình tinh thể lỏng video graphics array VGA bộ điều hợp VGA polarizing filter n bộ lọc cực block v phong tỏa ngăn chặn I. Read and think We interact with computer by entering instructions and data into them. After this information has been processed internally we can see the results on the visual display unit or VDU. To obtain a permanent copy of these results we can use plotters printers or video recorders. In this interactive process with the computer the screen plays an important part. Describe the screen of our computer to another student. Use these questions to help you. - Is it monochrome or a color monitor What size is it Does it produce a high quality image II. Reading A. Read the text and try to guess the meaning of any new words in the box below. Refer to the Glossary if necessary. dot pixel display resolution cathode ray tube electron beam scan verb hertz flicker bit-mapped visualize 52 Lesson 2 Input output devices The monitor The characters and pictures that we see on the screen are made up of dots also called picture elements pixels . The total number of pixels in which the display is divided both horizontally and vertically is known as the resolution. If the number of pixels is very large we obtain a high-resolution display and therefore a sharp image. If the number of pixels is small a low resolution is produced. Low resolution High resolution display display Typical resolutions are 640 X 480 or 1 024 X 768 pixels. The diagrams above show how pixel density affects the image a larger number of pixels gives a much clearer image. The cathode ray tube of the monitor is very .
