Guangzhou Yi Chuan Monitor Factory tells you: Due to the particularity and professionalism of LCD monitor applications, in order to ensure the practicality of LCD monitors, LCD monitors should pay attention to the performance of the LCD screen, such as size, panel level , brightness, contrast, resolution, response time, color reproduction, viewing angle; In addition, when combined with the appearance of the structure, signal support, whether there is heat and anti-jamming design and so on. If the conditions permit, it is also possible to perform long-term roasting test to observe the stability of the product, and these factors all affect the use of the entire project.
Ten parameters for choosing an LCD monitor
1. Viewing Area When purchasing an LCD monitor, the first consideration is the size of the face. For LCD monitors, the size of the panel is the size of the visible area, which is somewhat different from the CRT monitor. Monitors with the same specifications also have larger LCDs than CRTs. A typical 15-inch LCD is equivalent to a 17-inch CRT, a 17-inch LCD is equivalent to a 19-inch CRT, and a 19-inch LCD is equivalent to a 21-inch CRT. Current LCD monitors have 3.5-inch, 5.6-inch, 7-inch, 8-inch and other vehicle-mounted monitoring displays, 10.4, 12-inch, 15-inch, 17-inch, 19-inch, and 20.1-inch are 4:3 display ratios, 22-inch, 26-inch 32-inch, 37-inch, 40-inch, 42-inch, 47-inch, 52-inch, 55-inch, 65-inch, 70-inch, and 82-inch are 16:9 display ratios.
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2. The bad points and highlights of the panel-level LCD panel are still another important criterion for judging the merits of the monitor. Bad points are divided into bright spots, dark spots, and color spots, which refer to unrepairable physical pixels on the LCD panel. The LCD screen is divided into several levels according to the difference of the parameters such as bad point, color purity, and viewing angle: A+ level: LCD screen without any dead pixels is A+ level; A level: within 3 bad pixels, no more than one bright point, The highlights are not in the central area of ​​the screen; Level B: 5 points or less, including no more than two highlights, and the highlights are not in the central area of ​​the screen; Level C: More than 3 bad points.
3. Brightness The brightness of the LCD monitor refers to the brightness of the display screen, which is the maximum brightness that the LCD monitor can achieve under the white screen. The unit is Candelas per square meter (cd/m2) or nits. The brightness of the LCD monitor is mainly determined by the brightness of the backlight. The brightness of the backlight is controlled, that is, the brightness of the LCD monitor is controlled.
4. The ratio of the brightness at the brightest and darkest points of the same point on the contrast LCD screen is the contrast of the LCD monitor. High contrast means a relatively high brightness and a bright color of the displayed color. The LCD monitor has a contrast ratio of 500:1, 1000:1 or higher.
5, response time At present, the biggest selling point of the LCD monitor is the increasing response time, from the beginning of the 25ms to the current grayscale 4ms, the speed increase is amazing. The response time determines the number of picture frames that the monitor can display per second. Usually when the picture display speed exceeds 25 frames per second, the human eye will regard the fast-converted picture as a continuous picture. When the high-speed ball is operated and the screen is switched/moved at high speed, the best display effect needs to be achieved. The screen display speed is more than 60 frames per second, and the response time is within 16 ms to meet the requirement. That is, the smaller the response time, the faster The more perfect the effect displayed by the changing picture.
6, color reproduction color gamut is a color coding method, also refers to a technical system can produce the sum of the colors. The color gamut of ordinary LCDs is about 72%. The LCD screens selected by Fortunate Digital use high color gamut LCD screens in order to display richer colors. The color gamut is as high as 92%. Therefore, the color of the display is more abundant and the color depth of the LCD monitor is improved.
7. Viewing angle Because the light of the LCD monitor is emitted through the liquid crystal at a near vertical angle, we can observe the screen from other angles and it will not be as clear as watching the CRT monitor. , and will see obvious color distortion. This is caused by the size of the viewing angle. Specifically, the viewing angle is divided into a horizontal viewing angle and a vertical viewing angle. When selecting the LCD monitor, products with a large viewing angle should be selected as much as possible. The viewing angle of the LCD monitor is also called the viewing angle range, and includes two indicators of horizontal viewing angle and vertical viewing angle. The horizontal viewing angle display means that the vertical axis of the display screen is perpendicular to the vertical axis of the display screen. Left and right can still see the normal display image at a certain angle. This angle range is the horizontal viewing angle of the LCD monitor. Similarly, if the horizontal axis prevails, the upper and lower viewing angles are called vertical visibility. angle. The remote LCD monitor uses a wide viewing angle LCD screen with up and down viewing angles of up to 89 degrees.
8. The principle of intelligent erasing and residual imaging The intelligent image erasing function of digital image processing chip will continuously monitor the input signal, and determine whether the image is still image or dynamic according to the RMS value of each frame of the input signal. The rms value of the image reflects the average brightness level and light-dark distribution of the input image. From this parameter, we can determine the characteristics and differences of each frame of the input signal. If the input image is a still image for a while, the system That is, the engine for killing residual image is started, and the engine automatically moves the format of the input signal according to the still or moving condition of the input image, so that the input image is displayed on the screen with a slight and rapid change, and the liquid crystal molecules are eliminated for a long time. There is no change in control, and this long-term, static control voltage for the liquid crystal molecules is the root cause of the afterimage of the liquid crystal screen after a long time playing a still image. After the rapid and minor transformation of the still image input by the residual image engine, the liquid crystal molecules have a chance to breathe for a certain period of time, thereby avoiding the permanent damage to the liquid crystal screen and achieving the purpose of eliminating the afterimage.
9, signal support a complete set of monitoring projects, it is necessary to require a lot of equipment, more commonly used cameras, hard disk recorders, picture splitters, distributors, amplifiers, matrix, network *, multi-screen processor, etc., each Different types of equipment have different signal input and output interfaces. In order to take into account the smooth progress of the overall project, after many front-end equipments are deployed and the terminal signal output is determined, the corresponding monitor can be selected next. In order to meet the needs of monitoring and control projects, the digital LCD monitor series produced by Yuanner Digital has a variety of interfaces such as BNC/Component/S-VIDEO/VGA/HDMI/DVI, which is a perfect match for almost any monitoring front-end equipment on the market.
10, the whole stability monitor in the formation of closed-circuit monitoring system, usually requires 24 hours a day, 365 days a year without interruption of power use, (and television usually only work a few hours per day), and some monitor application environment It may be more severe, which requires a higher reliability and stability of the monitor. Compared with televisions, in terms of design, the monitor's current, power consumption, temperature and resistance to electrical interference, the ability and margin of electrical shock, and average time between failures are much greater than those of televisions. At the same time, the monitor must also Use a fully shielded metal shell to ensure electromagnetic compatibility and interference performance; in the selection of components, the characteristics of the components used in the monitor, such as voltage resistance, current, temperature, humidity, etc., must be higher than the components used in the television; In the installation and debugging, especially the components and the aging process requirements, the monitor's requirements are also higher. The aging of the whole TV set is usually about 8 hours at the normal temperature on the assembly line, and the whole monitor is Aging requires aging for more than 24 hours in the aging pipeline of a high-temperature, high-humidity, sealed environment to ensure the stability of the entire machine. Components used in televisions are not suitable for continuous use without interruption. If you force the use of a TV as a monitor, it is prone to malfunction. If it is severe, it may cause an accident due to the high operating temperature of the TV.
Ten parameters for choosing an LCD monitor
1. Viewing Area When purchasing an LCD monitor, the first consideration is the size of the face. For LCD monitors, the size of the panel is the size of the visible area, which is somewhat different from the CRT monitor. Monitors with the same specifications also have larger LCDs than CRTs. A typical 15-inch LCD is equivalent to a 17-inch CRT, a 17-inch LCD is equivalent to a 19-inch CRT, and a 19-inch LCD is equivalent to a 21-inch CRT. Current LCD monitors have 3.5-inch, 5.6-inch, 7-inch, 8-inch and other vehicle-mounted monitoring displays, 10.4, 12-inch, 15-inch, 17-inch, 19-inch, and 20.1-inch are 4:3 display ratios, 22-inch, 26-inch 32-inch, 37-inch, 40-inch, 42-inch, 47-inch, 52-inch, 55-inch, 65-inch, 70-inch, and 82-inch are 16:9 display ratios.
2. The bad points and highlights of the panel-level LCD panel are still another important criterion for judging the merits of the monitor. Bad points are divided into bright spots, dark spots, and color spots, which refer to unrepairable physical pixels on the LCD panel. The LCD screen is divided into several levels according to the difference of the parameters such as bad point, color purity, and viewing angle: A+ level: LCD screen without any dead pixels is A+ level; A level: within 3 bad pixels, no more than one bright point, The highlights are not in the central area of ​​the screen; Level B: 5 points or less, including no more than two highlights, and the highlights are not in the central area of ​​the screen; Level C: More than 3 bad points.
3. Brightness The brightness of the LCD monitor refers to the brightness of the display screen, which is the maximum brightness that the LCD monitor can achieve under the white screen. The unit is Candelas per square meter (cd/m2) or nits. The brightness of the LCD monitor is mainly determined by the brightness of the backlight. The brightness of the backlight is controlled, that is, the brightness of the LCD monitor is controlled.
4. The ratio of the brightness at the brightest and darkest points of the same point on the contrast LCD screen is the contrast of the LCD monitor. High contrast means a relatively high brightness and a bright color of the displayed color. The LCD monitor has a contrast ratio of 500:1, 1000:1 or higher.
5, response time At present, the biggest selling point of the LCD monitor is the increasing response time, from the beginning of the 25ms to the current grayscale 4ms, the speed increase is amazing. The response time determines the number of picture frames that the monitor can display per second. Usually when the picture display speed exceeds 25 frames per second, the human eye will regard the fast-converted picture as a continuous picture. When the high-speed ball is operated and the screen is switched/moved at high speed, the best display effect needs to be achieved. The screen display speed is more than 60 frames per second, and the response time is within 16 ms to meet the requirement. That is, the smaller the response time, the faster The more perfect the effect displayed by the changing picture.
6, color reproduction color gamut is a color coding method, also refers to a technical system can produce the sum of the colors. The color gamut of ordinary LCDs is about 72%. The LCD screens selected by Fortunate Digital use high color gamut LCD screens in order to display richer colors. The color gamut is as high as 92%. Therefore, the color of the display is more abundant and the color depth of the LCD monitor is improved.
7. Viewing angle Because the light of the LCD monitor is emitted through the liquid crystal at a near vertical angle, we can observe the screen from other angles and it will not be as clear as watching the CRT monitor. , and will see obvious color distortion. This is caused by the size of the viewing angle. Specifically, the viewing angle is divided into a horizontal viewing angle and a vertical viewing angle. When selecting the LCD monitor, products with a large viewing angle should be selected as much as possible. The viewing angle of the LCD monitor is also called the viewing angle range, and includes two indicators of horizontal viewing angle and vertical viewing angle. The horizontal viewing angle display means that the vertical axis of the display screen is perpendicular to the vertical axis of the display screen. Left and right can still see the normal display image at a certain angle. This angle range is the horizontal viewing angle of the LCD monitor. Similarly, if the horizontal axis prevails, the upper and lower viewing angles are called vertical visibility. angle. The remote LCD monitor uses a wide viewing angle LCD screen with up and down viewing angles of up to 89 degrees.
8. The principle of intelligent erasing and residual imaging The intelligent image erasing function of digital image processing chip will continuously monitor the input signal, and determine whether the image is still image or dynamic according to the RMS value of each frame of the input signal. The rms value of the image reflects the average brightness level and light-dark distribution of the input image. From this parameter, we can determine the characteristics and differences of each frame of the input signal. If the input image is a still image for a while, the system That is, the engine for killing residual image is started, and the engine automatically moves the format of the input signal according to the still or moving condition of the input image, so that the input image is displayed on the screen with a slight and rapid change, and the liquid crystal molecules are eliminated for a long time. There is no change in control, and this long-term, static control voltage for the liquid crystal molecules is the root cause of the afterimage of the liquid crystal screen after a long time playing a still image. After the rapid and minor transformation of the still image input by the residual image engine, the liquid crystal molecules have a chance to breathe for a certain period of time, thereby avoiding the permanent damage to the liquid crystal screen and achieving the purpose of eliminating the afterimage.
9, signal support a complete set of monitoring projects, it is necessary to require a lot of equipment, more commonly used cameras, hard disk recorders, picture splitters, distributors, amplifiers, matrix, network *, multi-screen processor, etc., each Different types of equipment have different signal input and output interfaces. In order to take into account the smooth progress of the overall project, after many front-end equipments are deployed and the terminal signal output is determined, the corresponding monitor can be selected next. In order to meet the needs of monitoring and control projects, the digital LCD monitor series produced by Yuanner Digital has a variety of interfaces such as BNC/Component/S-VIDEO/VGA/HDMI/DVI, which is a perfect match for almost any monitoring front-end equipment on the market.
10, the whole stability monitor in the formation of closed-circuit monitoring system, usually requires 24 hours a day, 365 days a year without interruption of power use, (and television usually only work a few hours per day), and some monitor application environment It may be more severe, which requires a higher reliability and stability of the monitor. Compared with televisions, in terms of design, the monitor's current, power consumption, temperature and resistance to electrical interference, the ability and margin of electrical shock, and average time between failures are much greater than those of televisions. At the same time, the monitor must also Use a fully shielded metal shell to ensure electromagnetic compatibility and interference performance; in the selection of components, the characteristics of the components used in the monitor, such as voltage resistance, current, temperature, humidity, etc., must be higher than the components used in the television; In the installation and debugging, especially the components and the aging process requirements, the monitor's requirements are also higher. The aging of the whole TV set is usually about 8 hours at the normal temperature on the assembly line, and the whole monitor is Aging requires aging for more than 24 hours in the aging pipeline of a high-temperature, high-humidity, sealed environment to ensure the stability of the entire machine. Components used in televisions are not suitable for continuous use without interruption. If you force the use of a TV as a monitor, it is prone to malfunction. If it is severe, it may cause an accident due to the high operating temperature of the TV.
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