•翻翻翻翻翻
•翻譯及錄音
Nanotechnology and the Photoelectric
Effect- LCD’s Imaging Principle
Learning Objectives1. 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
145.5 ℃ , 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
178.5 . 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
Objectives
Understand
Liquid Crystal
RGB Pixels
LCD Array
3D Imagin
g
Little Test Home
Incorrect! Please try again!
Correct! Please move on to the next question.
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 Temperature
Temperature
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) 256 + 256 + 256
(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