What are the advantages and disadvantages of LCD TV?
Author:Zhang Ruizhi Time:2021-07-20 09:13 Browse(643)
LCD TV - Advantages
LCD TV - advantages.
1. LCD TV has the advantages of flat panel TV.
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What are the advantages and disadvantages of LCD TV?

· flat, thin and light.
it can be applied to wall hanging mode<
· line by line addressing and high field frequency display are adopted.
there is no inter line and large area flicker in the image · the position and tilt of grating are not affected by geomagnetism<
· explosion proof, radiation proof and good safety.
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2. LCD TV has many sizes and models, and LCD TV has many sizes and models.
from several inches to 65 inches (currently the largest LCD TV), there are dozens of sizes of LCD TV, such as 5.2 inches, 6.4 inches, 10.4 inches, 13.1 inches, 14 inches, 15 inches... 27 inches, 32 inches? 6 inches, 42 inches, 60 inches, because the LCD screen for LCD TV is cut from the LCD panel, according to the setting in the production process, different sizes of LCD TV screens can be cut, and the ratio of screen amplitude to type can be 4:3 or 16:9, so that consumers can have more choices according to their own needs.
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3 × 1080.
the horizontal and vertical definition of the still image can reach 1080 TV lines, and the display image is delicate.
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4. High brightness.
the display image is transparent and bright.
the display still image has high definition.
it is suitable for computer display.
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LCD TV - disadvantages.
1 The contrast and color saturation decrease with the increase of viewing angle, and the chromaticity error increases with the increase of viewing angle.
results show that the contrast and color saturation decrease with the increase of viewing angleReduce the image quality<
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2. Long response time.
among all the displays, the LCD has the slowest response time, which makes the moving image trailing, resulting in poor dynamic clarity and image blurring<
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3. Poor brightness uniformity due to the use of backlight.
due to the uneven arrangement of backlight tubes and the inconsistent luminous characteristics, the brightness uniformity of the full screen is poor.
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4. The common disadvantages of flat-panel TV with fixed pixel addressing mode are as follows:
pixel effect: when viewing the image in close range.
due to the obvious spacing between pixels, We can see pixel particles.
but it is lighter than plasma; False image and false image contour.
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5. The color and gamut coverage of the display is small, because the composition and imaging principle of LCD TV are different from CRT and plasma.
the color of LCD display is a full-color picture displayed in simulation mode, and the color restoration ability is obviously insufficient compared with CRT and plasma, and the color coverage is small, In recent years, great improvements have been made in technology.
however, it is still not as natural and realistic as CRT and plasma TV, This is still the subject of further research on liquid crystal.
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6. The so-called bad points of LCD TV screen refer to the pixels that can not be normally displayed on the LCD panel.
generally, they are divided into bright spots and dark spots.
at present, TFT-LCD is used in LCD TVs, that is, TFT-LCD panel.
each imaging pixel is composed of a thin film crystal integrated behind And control each pixel,However, due to the damage or unstable working state of the thin film transistor, the transistor will be in the on state or off state for a long time, or in the on-off state when it is not controlled by the voltage, and there will be constant bright spots, constant black spots, high voltage and low voltage on the LCD screen However, it is less than LCD TV.
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7. The edge of light leakage screen is easy to produce light leakage.
it will cause uneven brightness of the whole screen and increase white balance and chromaticity error, The average luminous efficiency of liquid crystal is 1.05lm/w.
it is in the same order of magnitude as the current plasma luminous efficiency of 1.8lm/w, The optical efficiency of plasma is slightly better than that of liquid crystal.
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9. The power consumption is relatively high. According to Larry Weber, one of the inventors of plasma, "although the power consumption of plasma is worse than that of liquid crystal TV in the case of the highest brightness display,
when the ordinary image is displayed, the power consumption of plasma is relatively high, The power consumption of plasma is very low.
this is because the power consumption of self luminous plasma TV is only about 20% of that of the highest brightness display, while the power consumption of LCD TV has nothing to do with the image, because the backlight lamp is always on, As a result, the power consumption has been very large.
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10. Digital to analog conversion leads to the decline of image quality. LCD and CRT produce brightness and gray level through the device voltage control.
but like the principle of plasma panel technology, it has a digital pixel array structure during manufacturing, so LCD is a digital analog hybrid technology.
in the full digital TV system.
in this paper, the design of LCD is introducedLCD TV must go through D / a transformation to display image.
this will cause the loss of signal information and reduce the image quality.
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11. Nonlinear driving causes image distortion due to the imaging principle of LCD.
when the brightness corresponding to a given driving signal voltage is an irregular "s" shape, that is, when the driving signal is in the initial state and peak value, the image distortion will be caused, That is to say, the brightness changes slowly near the two ends of the black light and the peak white light, but in the middle of the gray level, the brightness changes very quickly, showing a linear straight line (this image shape seems to be an S shape near the top and bottom, which is almost a horizontal line). In signal processing, it is very difficult to transform this s shape into a linear gray relationship, and it is difficult to realize it, This leads to gray compression and saturation near the peak white light, and black is not black near the black light, which makes the brightness and chroma uniformity of the screen display worse, and the displayed image distorted, In particular, the definition of fast moving image is reduced.
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12. Artificially improving the brightness leads to color distortion. Due to the influence of light leakage and other factors.
the black image is not black when it is displayed.
in order to increase the contrast and the sense of hierarchy of the image.
in the circuit design, the brightness and color temperature are artificially adjusted higher, This will bring other defects.
high brightness makes the viewer tired when watching for a long time.
especially for teenagers, long time watching may cause eye damage; The higher color temperature will cause the color distortion of the display, the color of the display is bluish and unreal, and the transition edge of the image is stiff and not soft, giving people a false feeling.
to sum up.
when LCD is used to display video and high-speed moving images on TV, it must.
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1. Improve the viewing angle, reduce the trailing time of moving images, and increase the clarity of moving images.
2Expand gamut, improve gamut coverage and brightness uniformity, etc
2. Improve the luminous efficiency.
further reduce the power consumption
3. Improve the production process structure of LCD screen.
reduce light leakage and bad points 5. Improve the yield of large screen LCD.
reduce the price.
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