翻譯及錄音

Nanotechnology and the Photoelectric Effect- LCD’s Imaging Principle

Learning Objectives 1.To understand CRT-TV’s, Plasma-Screen TV’s, and LCD TV’s imaging principles 2.To understand the difference between pigment three primary colors and RGB shade primary colors. 3.To control the voltage, and to observe relationship between Liquid Crystal‘s deflection and the imaging monitor’s coloration 4.To understand how to control Liquid Crystal’s array formation 5.To understand the relationship between LCD Glasses and 3D Projection’s Imaging Principles

Characteristics of CRT Displays In today’s modern society, we can’t escape watching television or computer screens. Before LCD’s were invented, electronic screens were made from cathode-ray tubes. CRT imaging comes from beam of electrons continually moving in all directions. When the beam of electrons starts from the upper left corner and ends in the upper right corner, the electrons will immediately return to the upper left corner. Thus, a horizontal line is created. When the CRT screen becomes a still figure for a long period of time, the internal screen’s phosphorescent film will gradually change. In the end, the blur remaining on the screen is imprinted on the phosphorescent film.

Plasma Screen’s Imaging Principles Plasma screens are gas chambers coated on the surface with phosphor. Under UV radiation, visible light can radiate three colors – red, blue, green. Electrical voltage is added to each gas chamber to create plasma discharge. When visible light interacts with different colored phosphor, image pixels are formed after recombination. However, Plasma screens still will more or less incur some film imprintation.

The Discovery of Liquid Crystal In 1888, Friedrich Reinitzer, an Austrian botanist, discovered Liquid Crystal. He observed that when Cholesteryl benzoate is heated to ℃ ， the solid melts ， becoming something similar between solid and liquid. It becomes a semi-molten white flowing liquid ， similar to colloidal solution of soapy water ， it has LCD liquid-like fluidity and also crystalization’s typical optical properties This condition will be maintained until the temperature rises to ℃. At that moment, it will become clear liquid.

LCD’s Imaging Principle LCD Displays are created from placing Liquid Crystals between two conductive glass sheets. Through applying electrical voltage, liquid crystal particles can rearrange in a certain fashion to control light transmission, creating shading. LCD displays require a color filter applied to have it display color images.

Pigment Three Primary Colors Primary colors aren’t able to be created from combining other colors. The three primary pigments are red, yellow, and blue. The more you combine the three pigments, the duller the resultant color is. When you combine all three colors equally, black is obtained.

RGB Shade Three Primary Colors Light’s three primary colors – red, green, and blue when mixed together equally, creates the brightest color – white. Every color is assigned a numerical value from 0-255, completely representing 256 different colors. With over 16 million different colors from combining different RGB’s, the full color spectrum can be created.

Please choose three secondary colors

LCD imaging utilizes the three primary colors – red, green, and blue to form the 256 RGB color spectrum, where 0 represents the darkest and 0 represents the brightest. The three colors – red, green, and blue, when shone the brightest, result in the color white. When the light exposure is the darkest, the result is black. When the three colors are exposed at different light exposures, different colors will be created. Please click the button to magnify the colored lines.

Liquid Crystal Display is created from putting liquid crystal in between two pieces of conductive glass. When an electric field is applied to the glass ， liquid crystal molecules can rearrange and twist resulting in polarized light. Please properly adjust the voltage between the two conducting glass sheets.

LCD Array Liquid crystal displays are divided into two categories: passive drive and active drive The passive drive type has only electrodes and liquid crystal on the display board. The upper and lower boards form a matrix of scanning electrodes and data electrodes. Using synchronized scanning, a contrast display is achieved.

3D 顯示器 3D glasses achieve 3-D effect by switching the glasses between dark (blocking) and clear (seeing). It does so in a way that each one of the eyes receives different information alternatively. The brain then combines the information from both eyes to construct the desired 3-D image. Please properly adjust liquid crystal display frequency.

翻譯

Learning Objective s Understa nd Liquid Crystal RGB Pixels LCD Array 3D Imaging Little Test Home

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1.Which of the following images below show the correct schematic diagram of Liquid Crystal? 以上皆非 (A) (B) (C) (D) None of the above

2. Which of the following images below properly shows the arrangement of Liquid Crystal as the temperature increases? (A)(B) (C) (D) (A) (B) (C) (D) Temperature

3.LCD monitors utilize which method to initiate the rearrangement of liquid crystal molecules? (A) Temperature (B) Chemical Reactivity (C) Electric Field (D) Magic

4.Why do LCD monitor’s utilize electric fields to excite liquid crystal molecules rather than temperature? (A) More appropriate reaction time length (B) Practicality (C) Inexpensive (D) All of the above

5.Within the image, which section controls light polarization ？ (A) (B) (C) (D) (A) (C) (B) (D)

6. Which diagram below depicts light being able to pass through the second polaroid ？ (A) (B) (C) (D)

7.What is the definition of a Primary Color ？ (A) Only the colors – red, green, blue (B) A color that can’t be created from mixing other colors together (C) When mixing all the primary colors together, the color black is obtained (D) All of the above

8. RGB has 256 possible numerical entries. The color white has three colors exposed to the brightest. What is the matching color combination? (A) ( 0, 0, 0 ) (B) (256, 256, 256) (C) (255, 0, 255) (D) (255, 255, 255)

9. Which option below (R, G, B) containing RGB numerical values can create the color violet? (A) ( 40, 40, 40 ) (B) (200, 200, 50) (C) (0, 100, 100) (D) (170, 0, 170)

10.When combining (R,G,B) three primary colors, over 16 million various colors can be produced. How is this statistic calculated? (A) (B) 256 – 256 – 256 (C) 256 x 256 x 256 (D) 256 ÷ 256 ÷ 256

11.Which of the following choices below aren’t a typical application of LCD Monitor ？ (A)Backlight (B)Polarizer (C)Cathode Ray Tube (D)Color Filter

12.Which of the choices below regarding color is incorrect? (A)The 3 primary colors are red, yellow, and blue (B)White is obtained when you mix the 3 primary colors together (C)RGB primary color mixing is a reductive mixing (D)When you mix red and green light together, yellow light can be obtained

13. Regarding 「 Color-LCD 」， which of the following options below is incorrect? (A)Liquid crystal placed between two polarizing plates perpendicular to each other (B)By applying and controlling an electric field applied to the liquid crystal, the pixels can become transparent. (C)Using a filter, red, green and blue pixels can be created (D)Red, green, and blue are three plain colors that form black when exposed to light

14. Why doesn’t LCD Monitor’s have the problem of phosphor imprinting? (A)Since Liquid Crystal has 2 different melting points (B)Because there is a screen protector methodology (C)Because there are very few phosphor structures (D)Because the image doesn’t directly utilize phosphorescence

15.Regarding 「 stereovision 」， which of the following choices bellow is incorrect? (A)3D perception comes from the difference in visual percetion between the two eyes (B)3D display is created from manually creating visual differences (C)The left and right eye sees two different images to create the overall 3D effect (D)Currently, 3D technology can be only utilized in glasses

The End