At present, 3D display technology can be mainly divided into glasses and naked glasses, glasses 3D display technology developed earlier, the solution is also more mature, has been used for many years in the commercial sector, this year's 3D flat-Panel TVs are also listed as eye-type products. However, glasses-type 3D televisions need to wear custom 3D glasses, which may be inconvenient for consumers who have already worn the glasses. The naked-eye type 3D allows viewers to enjoy 3D effects without the need for additional equipment. It is generally welcomed by consumers and paid attention to by manufacturers. The naked-eye 3D technology is the development direction of 3D display technology.
Glasses - active shutter 3D technology
Glasses 3D display technology needs to wear custom 3D glasses, which can be mainly divided into active and passive, active shutter 3D display is currently the mainstream market, including Samsung, Sony, LG, Hisense, Konka and other manufacturers to launch 3D TVs are Adopt active shutter 3D display technology.
The principle of active shutter 3D technology
As we all know, the principle of 3D imaging is to use two cameras to simulate the principle of the human eye to observe things. Two pictures with slightly different visual angles are shot. When they are played, they are output to the two eyes of the person. It can be said that 3D shooting and It's not difficult, technically, it doesn't make any difference. The hard part is how to make only the two eyes of the people can only watch the established picture.
Active shutter 3D technology, also known as time division method shading technology or liquid crystal time-sharing technology, it is mainly achieved by the liquid crystal eyes, and its eyeglasses are essentially two LCD screens that can separately control on/off, in the eyes The liquid crystal layer has two states, black and white, which are usually displayed in white or transparent state, and turn black when energized. Through a signal transmission device, precise synchronization between the 3D eye and the screen is achieved.
The left and right eye screens are played alternately on the display screen. When the left screen is played, the left eyeglasses are opened and the right eyeglasses are closed. The left eye of the viewer sees the screen that needs to be seen by the left eye, and the right eye cannot see anything. In the right-eye playback screen, the right eye sees the right screen, and the left eye does not see the screen, so that the left and right eyes respectively see the left and right respective screens, thereby achieving a 3D three-dimensional effect. This process alternates at least 120 times per second, and the human eye can enjoy a coherent and non-flashing 3D picture, so the active 3D display technology requires a screen refresh rate of at least 120 Hz.
Analysis of advantages and disadvantages of active shutter 3D technology
The active shutter 3D technology has the advantages of less residual image and outstanding 3D effect. Moreover, the technology is relatively easy to implement and the screen cost is low. Whether it is a TV, a computer screen or a projector, as long as the update frequency can meet the requirements, it can be imported. Technology, so most of the upcoming 3D products on the market today basically use this technology.
However, there are many shortcomings of the technology, first of all, the brightness is greatly reduced, with the addition of black film 3D glasses, the actual brightness can be reduced by almost half. In addition, the active shutter glasses are limited by the liquid crystal layer, and the lens area cannot be made too large. For some people, especially those who wear glasses can easily see thick black frames around.
Active shutter 3D glasses have been in a high-speed open and closed state, long-term viewing is likely to cause human eyes fatigue, due to different frame changes in the discontinuity of time and the individual differences in the different glasses fatigue and brain fatigue rates are also different The most serious long-term viewing may cause vomiting and other phenomena. In addition, because the frequency of fluorescent devices in China, such as fluorescent lamps, is different from the opening and closing frequency of 3D glasses, lighting equipment has a great influence on viewing 3D images.
In addition, limited to the working principle of 3D glasses, but also cause the so-called "Crosstalk phenomenon", translated into Chinese is the "crosstalk phenomenon", that is, the opening and closing glasses shutter and left and right images are completely synchronized, if not fully synchronized will produce two The superposition between images causes blurring of the image and seriously affects viewing, that is, crosstalk.
There is a viewing angle problem, because the LCD TV panels and 3D glasses are made of liquid crystal molecular material, because of the characteristics of light transmission angle deflection, 3D images can only be viewed horizontally when wearing 3D glasses, can not be tilted, otherwise they can not enjoy 3D As a result, the black phenomenon may even be caused by the light-transmitting conflict of the liquid crystal cell and the deflection angle of the liquid crystal molecules of the 3D glasses.
Finally there is the disadvantage of glasses too high cost, the current market price of these active shutter 3D glasses are basically more than 1,000 yuan, and the 3D glasses launched by various manufacturers can not be universal, 3D glasses whether the signal is received, or both sides The flashing of the LCD is to consume power, so active shutter glasses also need to be charged from time to time. In addition, the radiation problem of 3D glasses can not be ignored, because the shutter-type 3D glasses are electronic devices, the lens is made from the liquid crystal layer, although the power is not large, but it will certainly produce radiation, coupled with the glasses close to Eyes, long-term wear may cause damage to human eyes.
Glasses - active shutter 3D technology
Glasses 3D display technology needs to wear custom 3D glasses, which can be mainly divided into active and passive, active shutter 3D display is currently the mainstream market, including Samsung, Sony, LG, Hisense, Konka and other manufacturers to launch 3D TVs are Adopt active shutter 3D display technology.
The principle of active shutter 3D technology
As we all know, the principle of 3D imaging is to use two cameras to simulate the principle of the human eye to observe things. Two pictures with slightly different visual angles are shot. When they are played, they are output to the two eyes of the person. It can be said that 3D shooting and It's not difficult, technically, it doesn't make any difference. The hard part is how to make only the two eyes of the people can only watch the established picture.
Only one lens transmits light at the same time
Active shutter 3D technology, also known as time division method shading technology or liquid crystal time-sharing technology, it is mainly achieved by the liquid crystal eyes, and its eyeglasses are essentially two LCD screens that can separately control on/off, in the eyes The liquid crystal layer has two states, black and white, which are usually displayed in white or transparent state, and turn black when energized. Through a signal transmission device, precise synchronization between the 3D eye and the screen is achieved.
Left and right eyes alternately receive pictures
The left and right eye screens are played alternately on the display screen. When the left screen is played, the left eyeglasses are opened and the right eyeglasses are closed. The left eye of the viewer sees the screen that needs to be seen by the left eye, and the right eye cannot see anything. In the right-eye playback screen, the right eye sees the right screen, and the left eye does not see the screen, so that the left and right eyes respectively see the left and right respective screens, thereby achieving a 3D three-dimensional effect. This process alternates at least 120 times per second, and the human eye can enjoy a coherent and non-flashing 3D picture, so the active 3D display technology requires a screen refresh rate of at least 120 Hz.
Analysis of advantages and disadvantages of active shutter 3D technology
The active shutter 3D technology has the advantages of less residual image and outstanding 3D effect. Moreover, the technology is relatively easy to implement and the screen cost is low. Whether it is a TV, a computer screen or a projector, as long as the update frequency can meet the requirements, it can be imported. Technology, so most of the upcoming 3D products on the market today basically use this technology.
However, there are many shortcomings of the technology, first of all, the brightness is greatly reduced, with the addition of black film 3D glasses, the actual brightness can be reduced by almost half. In addition, the active shutter glasses are limited by the liquid crystal layer, and the lens area cannot be made too large. For some people, especially those who wear glasses can easily see thick black frames around.
Active shutter 3D glasses have been in a high-speed open and closed state, long-term viewing is likely to cause human eyes fatigue, due to different frame changes in the discontinuity of time and the individual differences in the different glasses fatigue and brain fatigue rates are also different The most serious long-term viewing may cause vomiting and other phenomena. In addition, because the frequency of fluorescent devices in China, such as fluorescent lamps, is different from the opening and closing frequency of 3D glasses, lighting equipment has a great influence on viewing 3D images.
In addition, limited to the working principle of 3D glasses, but also cause the so-called "Crosstalk phenomenon", translated into Chinese is the "crosstalk phenomenon", that is, the opening and closing glasses shutter and left and right images are completely synchronized, if not fully synchronized will produce two The superposition between images causes blurring of the image and seriously affects viewing, that is, crosstalk.
No 3D picture when tilted
There is a viewing angle problem, because the LCD TV panels and 3D glasses are made of liquid crystal molecular material, because of the characteristics of light transmission angle deflection, 3D images can only be viewed horizontally when wearing 3D glasses, can not be tilted, otherwise they can not enjoy 3D As a result, the black phenomenon may even be caused by the light-transmitting conflict of the liquid crystal cell and the deflection angle of the liquid crystal molecules of the 3D glasses.
Finally there is the disadvantage of glasses too high cost, the current market price of these active shutter 3D glasses are basically more than 1,000 yuan, and the 3D glasses launched by various manufacturers can not be universal, 3D glasses whether the signal is received, or both sides The flashing of the LCD is to consume power, so active shutter glasses also need to be charged from time to time. In addition, the radiation problem of 3D glasses can not be ignored, because the shutter-type 3D glasses are electronic devices, the lens is made from the liquid crystal layer, although the power is not large, but it will certainly produce radiation, coupled with the glasses close to Eyes, long-term wear may cause damage to human eyes.
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