The commonly used projectors are mainly divided into digital (dlp) and liquid crystal (lcd) categories: due to the difference in processing techniques, the performance of the projector varies and each has its own characteristics. In general, because of different working methods, dLP projectors show excellent data signals, while lcd projectors show mimic signals with their characteristics. Because information processing techniques have been developed in the direction of digital disposal, dlp projection opportunities have gradually become mainstream. In order to make everyone aware of their differences, here's a brief comparison of the two for reference.
First, the difference between flatness
1. To compare the average degree of color, you can see it only by selecting a white image and projecting it on the screen. Dlp projection performance produces a pure white image, while lcd projector will show a color cast image (individual performance is a yellowish color), color cast to reproduce the color when there is a certain distortion, open control projector information, the company relies on Has long been engaged in video communications and control areas accumulated more than 10 years of rich experience and resources to form a professional team of technology and industry professionals! . This is due to the way lcd and dlp work. Lcd projector light to be projected through the LCD panel, the light through the LCD panel will cause a certain level of attenuation and the department into heat, with the gradual aging of lcd (especially the temperature will accelerate the aging of the LCD panel) The light transmittance of the liquid crystal panel will be reduced, and the inconsistent color cast of the red, green, and blue colors will inevitably emerge. Dlp's working method is to use digital micromirror group (dmd) to reflect light, RGB matrix sales, product performance, quality, stability, fine craftsmanship, welcomed by the majority of domestic users! The attenuation of the red, green, and blue light lines propagated in the unified medium (air) is uniform and the attenuation is small. Therefore dlp can restore pure white images.
2. Compared with the symmetry of the brightness, the important reaction is the difference in the luminance of the picture center and the four places that are projected. The dlp projector has had a great deal in this respect, reforming the condenser in the optical system, making the picture average brightness and clarity progressive. The degree of height of either the lcd or the dlp depends on its optical architecture. The resolution factors that can be said to be flat are mainly determined by the optical structure for the dlp machine, and are influenced by the quality of the liquid crystal and the light transmission function in addition to the optical structure.
Second, the difference between color reproduction
In this regard, the dlp machine has the upper hand. Because no color cast occurs, a high contrast image can be obtained, and color reproduction is better than lcd. Under normal circumstances, lcd's color tends to be strong, but the details are lacking, and with the lcd board's aging will gradually fade, and dlp's image is more real than the lcd color, natural, long-lasting, full of detail. The level of color reproduction can be marked by the color gamut. In theory, the color of a pure laser (not a hybrid light source such as an LED+laser) is the best and can be as high as 155% NTSC or more. In general, the color of the LED light source is relatively good (up to 120% NTSC), but this LED refers to the RGB timing LED, rather than a monolithic liquid crystal projector using a white LED (the actual color gamut is only about 50% NTSC). The type of light bulb used, the top must be xenon lamps, such as movie machines, some of Barco's home machine, SONY's top VW1000, etc. are using high-power Xenon lamp.
Third, the difference in brightness attenuation
For dlp, its brightness gradually decays with the aging of the light source. For lcd, the attenuation of the projector brightness is not only affected by the aging of the light source, but will also be affected by the aging of the lcd board. Resolution, needless to say, is the second indicator of the projector, there is no high-definition resolution (1280 * 720P and above), not to mention the basic quality conditions, the current mainstream home projector is 720P, 1080P, However, the high-calorie 4K projector has less practical significance in terms of human eye resolution, and the 4K models have too many obstacles in terms of playback equipment, film sources, and so on.
Fourth, the difference in imaging color
The color is composed of the three primary colors of red, green, and blue, and each color is divided into 256 levels on the computer, from light to dark with 0-255, and the combination of the three primary colors is 256*256*. 256=16,777,216 colors are presented, called full color. Dlp projection performance corresponds to these "pixels", relying on the "dmd" chip to constantly reflect it and reproduce it through the lens group projected on the screen, so its image on the screen has a strong sense of broken body, good color reproduction, And can completely represent 16777216 colors; and lcd machine is on the LCD panel imaging, light through the LCD panel and then projected onto the screen, due to the lcd board's polarized light caused by the color of the distortion and clarity of the landing.
Fifth, the difference between the life of dlp and lcd and the use of capital
Usually, the life of the LCD panel is 3-5 years. Even if it is not used, it will gradually deteriorate at room temperature. When it is used on a projector, a part of light energy can be converted into heat energy and accelerate the aging of the LCD panel when the light from the bulb passes through the LCD panel. The price of replacement after aging damage is relatively high. Currently, the price of changing a LCD panel is usually between 5000 and 7000 yuan. After the change, the new and old panels work at the same time and cause large differences in color and brightness attenuation. If the LCD panel is replaced at the same time, the price is expensive. The typical chip life is 100,000 hours, and the new and old boards will not show brightness and color differences. Can say, life and application costs, VGA matrix switcher information, completely solve the bottleneck of large-scale matrix signal quality, easy maintenance and expansion, VGA matrix switcher is an independent research and development of professional high-definition matrix, a flexible composition, reliable operation, Easy to maintain! Dlp has a larger advantage than lcd.
The biggest advantage of the Lcd projector is that the three primary colors of red, green, and blue are completed by three separate liquid crystal panels. The brightness and contrast of each color can be individually controlled, and the three colors of light can reach the screen at the same time. Reproduce various colors. In a single-chip dLP projector, color separation is achieved by a color separation wheel. Three-color light is modulated by the same micro-mirror. Therefore, the three-color light arrives at the screen in a time-sharing manner, and the color is affected by the separation wheel rotation speed and the speed of the micromirror deflection. The reproduction aspect has a certain gap compared to the LCD projector. Especially when displaying dynamic video images, LCD technology will have more advantages than DLP technology because the image refresh rate is faster and the modulation speed requirement of each color is higher.
First, the difference between flatness
1. To compare the average degree of color, you can see it only by selecting a white image and projecting it on the screen. Dlp projection performance produces a pure white image, while lcd projector will show a color cast image (individual performance is a yellowish color), color cast to reproduce the color when there is a certain distortion, open control projector information, the company relies on Has long been engaged in video communications and control areas accumulated more than 10 years of rich experience and resources to form a professional team of technology and industry professionals! . This is due to the way lcd and dlp work. Lcd projector light to be projected through the LCD panel, the light through the LCD panel will cause a certain level of attenuation and the department into heat, with the gradual aging of lcd (especially the temperature will accelerate the aging of the LCD panel) The light transmittance of the liquid crystal panel will be reduced, and the inconsistent color cast of the red, green, and blue colors will inevitably emerge. Dlp's working method is to use digital micromirror group (dmd) to reflect light, RGB matrix sales, product performance, quality, stability, fine craftsmanship, welcomed by the majority of domestic users! The attenuation of the red, green, and blue light lines propagated in the unified medium (air) is uniform and the attenuation is small. Therefore dlp can restore pure white images.
2. Compared with the symmetry of the brightness, the important reaction is the difference in the luminance of the picture center and the four places that are projected. The dlp projector has had a great deal in this respect, reforming the condenser in the optical system, making the picture average brightness and clarity progressive. The degree of height of either the lcd or the dlp depends on its optical architecture. The resolution factors that can be said to be flat are mainly determined by the optical structure for the dlp machine, and are influenced by the quality of the liquid crystal and the light transmission function in addition to the optical structure.
Second, the difference between color reproduction
In this regard, the dlp machine has the upper hand. Because no color cast occurs, a high contrast image can be obtained, and color reproduction is better than lcd. Under normal circumstances, lcd's color tends to be strong, but the details are lacking, and with the lcd board's aging will gradually fade, and dlp's image is more real than the lcd color, natural, long-lasting, full of detail. The level of color reproduction can be marked by the color gamut. In theory, the color of a pure laser (not a hybrid light source such as an LED+laser) is the best and can be as high as 155% NTSC or more. In general, the color of the LED light source is relatively good (up to 120% NTSC), but this LED refers to the RGB timing LED, rather than a monolithic liquid crystal projector using a white LED (the actual color gamut is only about 50% NTSC). The type of light bulb used, the top must be xenon lamps, such as movie machines, some of Barco's home machine, SONY's top VW1000, etc. are using high-power Xenon lamp.
Third, the difference in brightness attenuation
For dlp, its brightness gradually decays with the aging of the light source. For lcd, the attenuation of the projector brightness is not only affected by the aging of the light source, but will also be affected by the aging of the lcd board. Resolution, needless to say, is the second indicator of the projector, there is no high-definition resolution (1280 * 720P and above), not to mention the basic quality conditions, the current mainstream home projector is 720P, 1080P, However, the high-calorie 4K projector has less practical significance in terms of human eye resolution, and the 4K models have too many obstacles in terms of playback equipment, film sources, and so on.
Fourth, the difference in imaging color
The color is composed of the three primary colors of red, green, and blue, and each color is divided into 256 levels on the computer, from light to dark with 0-255, and the combination of the three primary colors is 256*256*. 256=16,777,216 colors are presented, called full color. Dlp projection performance corresponds to these "pixels", relying on the "dmd" chip to constantly reflect it and reproduce it through the lens group projected on the screen, so its image on the screen has a strong sense of broken body, good color reproduction, And can completely represent 16777216 colors; and lcd machine is on the LCD panel imaging, light through the LCD panel and then projected onto the screen, due to the lcd board's polarized light caused by the color of the distortion and clarity of the landing.
Fifth, the difference between the life of dlp and lcd and the use of capital
Usually, the life of the LCD panel is 3-5 years. Even if it is not used, it will gradually deteriorate at room temperature. When it is used on a projector, a part of light energy can be converted into heat energy and accelerate the aging of the LCD panel when the light from the bulb passes through the LCD panel. The price of replacement after aging damage is relatively high. Currently, the price of changing a LCD panel is usually between 5000 and 7000 yuan. After the change, the new and old panels work at the same time and cause large differences in color and brightness attenuation. If the LCD panel is replaced at the same time, the price is expensive. The typical chip life is 100,000 hours, and the new and old boards will not show brightness and color differences. Can say, life and application costs, VGA matrix switcher information, completely solve the bottleneck of large-scale matrix signal quality, easy maintenance and expansion, VGA matrix switcher is an independent research and development of professional high-definition matrix, a flexible composition, reliable operation, Easy to maintain! Dlp has a larger advantage than lcd.
The biggest advantage of the Lcd projector is that the three primary colors of red, green, and blue are completed by three separate liquid crystal panels. The brightness and contrast of each color can be individually controlled, and the three colors of light can reach the screen at the same time. Reproduce various colors. In a single-chip dLP projector, color separation is achieved by a color separation wheel. Three-color light is modulated by the same micro-mirror. Therefore, the three-color light arrives at the screen in a time-sharing manner, and the color is affected by the separation wheel rotation speed and the speed of the micromirror deflection. The reproduction aspect has a certain gap compared to the LCD projector. Especially when displaying dynamic video images, LCD technology will have more advantages than DLP technology because the image refresh rate is faster and the modulation speed requirement of each color is higher.
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