З розробкою та застосуванням внутрішніх світлодіодних екранів все більше і більше, незалежно від того, в командному центрі, центрі моніторингу чи навіть у студії, ви можете побачити, що світлодіодний екран широко використовується. Однак, судячи з загальної продуктивності системи світлодіодних екранів, чи можуть ці дисплеї задовольнити потреби користувачів? Чи можуть зображення, що відображаються на цих світлодіодних екранах, відповідати людському зору? Чи можуть ці світлодіодні екрани витримати випробування камер з різними затворами та різними кутами? Це все питання, які необхідно враховувати. Нижче я проаналізую кілька основних факторів (включаючи частоту оновлення, рівень сірого тощо), які впливають на ефект світлодіодного дисплея.
Частота оновлення світлодіодного дисплея
The refresh rate of the LED display (visual refresh rate)
"Visual refresh rate" refers to the screen update rate, usually expressed in Hertz (Hz). Generally speaking, the visual refresh rate is above 3,000 Hz, which is a high-performance LED display. The higher the visual refresh frequency, the more stable the screen display, and the smaller the visual flicker. The low "visual refresh rate" of the LED display screen has an impact in addition to the horizontal stripes appearing during shooting and photography, but also images similar to tens of thousands of light bulbs flashing at the same time, which may cause discomfort when viewed by the human eye , And even cause damage to the eyes.
Рівень сірого світлодіодного з’єднувального екрану
Although to the human eye, the visual refresh rate above 60Hz has already felt a continuous picture, but the higher the visual refresh frequency, the more stable the displayed image, and the less fatigue the human eye will feel. Nowadays, in high-quality video, in order to obtain more detailed images, such as wonderful playback or close-up photography, high-speed cameras above 1,000 Hz per second are used for shooting. At this time, for the LED display that will also be photographed, it is still a big challenge to still be able to present continuous images (without black scan lines) or continuous color gradations under high-speed shutters.
Світлодіодний дисплей рівня сірого
The refresh rate of Voury Zhuohua's VW micro-pitch LED display is not less than 3840Hz, and the captured picture is stable without ripples and no black screen. It can effectively solve the smearing and blur in the process of rapid image movement, enhance the definition and contrast of the image, and make the video picture delicate Smooth, long-term viewing is not easy to fatigue; with anti-gamma correction technology and point-by-point brightness correction technology, the dynamic picture display is more real, natural, and uniform.
The gray scale of the LED display
"Gray level" refers to the color hierarchy with different changes between dark and light colors. Generally speaking, the gray level is above 14 bits, that is, there are at least 16,384 color hierarchies, which is high performance LED display. If the number of gray levels is insufficient, the color level is insufficient or the gradient color level is not smooth enough, and the color of the video cannot be fully displayed. The LED display effect is greatly reduced. Some low-efficiency LED displays can already be detected with obvious color patch distribution under the shutter of 1/500s. If we increase the shutter speed, such as 1/1,000s or 1/2,000s, the situation will be even worse. obvious.
With the development and application of indoor LED display screens more and more, no matter in the command center, monitoring center or even the studio, you can see that the LED display screen is widely used. However, judging from the overall performance of the LED screen system, can these displays meet the needs of users? Can the images displayed on these LED screens conform to human vision? Can these LED screens withstand the test of cameras with different shutters and different angles? These are all issues that need to be considered. Below, I will analyze several major factors (including refresh frequency, gray level, etc.) that affect the LED display effect.
Частота оновлення світлодіодного дисплея
The refresh rate of the LED display (visual refresh rate)
"Visual refresh rate" refers to the screen update rate, usually expressed in Hertz (Hz). Generally speaking, the visual refresh rate is above 3,000 Hz, which is a high-performance LED display. The higher the visual refresh frequency, the more stable the screen display, and the smaller the visual flicker. The low "visual refresh rate" of the LED display screen has an impact in addition to the horizontal stripes appearing during shooting and photography, but also images similar to tens of thousands of light bulbs flashing at the same time, which may cause discomfort when viewed by the human eye , And even cause damage to the eyes.
Рівень сірого світлодіодного з’єднувального екрану
Although to the human eye, the visual refresh rate above 60Hz has already felt a continuous picture, but the higher the visual refresh frequency, the more stable the displayed image, and the less fatigue the human eye will feel. Nowadays, in high-quality video, in order to obtain more detailed images, such as wonderful playback or close-up photography, high-speed cameras above 1,000 Hz per second are used for shooting. At this time, for the LED display that will also be photographed, it is still a big challenge to still be able to present continuous images (without black scan lines) or continuous color gradations under high-speed shutters.
Світлодіодний дисплей рівня сірого
The refresh rate of Voury Zhuohua's VW micro-pitch LED display is not less than 3840Hz, and the captured picture is stable without ripples and no black screen. It can effectively solve the smearing and blur in the process of rapid image movement, enhance the definition and contrast of the image, and make the video picture delicate Smooth, long-term viewing is not easy to fatigue; with anti-gamma correction technology and point-by-point brightness correction technology, the dynamic picture display is more real, natural, and uniform.
The gray scale of the LED display
"Gray level" refers to the color hierarchy with different changes between dark and light colors. Generally speaking, the gray level is above 14 bits, that is, there are at least 16,384 color hierarchies, which is high performance LED display. If the number of gray levels is insufficient, the color level is insufficient or the gradient color level is not smooth enough, and the color of the video cannot be fully displayed. The LED display effect is greatly reduced. Some low-efficiency LED displays can already be detected with obvious color patch distribution under the shutter of 1/500s. If we increase the shutter speed, such as 1/1,000s or 1/2,000s, the situation will be even worse. obvious.
Voury Zhuohua's VW series of micro-pitch LED displays not only have high brightness of 1200cd/m2 and high grayscale up to 16bit, but more importantly, the product also has the characteristics of low brightness and high gray, which guarantees grayscale loss when the brightness is reduced. Small; the gray level is 16bit when the brightness is adjusted to 700cd/m2, and the gray level is 13bit when the brightness is adjusted to 240cd/m2; the characteristics of low brightness and high gray make the Voury Zhuohua VW series of fine-pitch LED displays always be able to Present any picture perfectly and meticulously.
What affects the refresh rate and gray level of the LED display?
We know several core components of the LED display, such as LED switching power supply, LED driver chip, LED lamp beads, etc. For the refresh frequency and gray level of the LED display, the LED driver chip directly determines the visual refresh frequency of the LED display , The performance of gray scale. Among the current LED driver chips, the high-tech technology is "ScrambledPWM (S-PWM) technology". S-PWM technology is an improvement on the traditional pulse width modulation (PWM) technology. Several shorter on-times to increase the overall visual update rate. To further explain, the built-in S-PWM technology of the new generation of LED driver chips can count once per frame (LED die ON→LED die OFF) and break it up into multiple counts on average. , And each divided aliquot can maintain the original On/Off ratio before being broken, as shown in the figure below.
S-PWM technology provides different counting modes, so the image refresh rate can be increased to 64 times. If you switch to S-PWM to increase the image refresh rate, you can easily increase the visual refresh rate by 64 times with a low-level clock (such as 5MHz), and it can reach more than 4,800Hz. Compared with general video, the refresh rate is at least 10 times higher, and it can also avoid the problems of high-frequency electromagnetic interference (EMIissue), over-voltage surge (Overshoot) and under-voltage surge (Undershoot).
The LED display with S-PWM driver chip is photographed with a high-speed shutter of a digital camera, but there is still no horizontal black scan line and color patch distribution (as shown in the figure below). Its visual refresh rate and gray scale performance far surpass LED display screens using traditional switch-type driver chips.
Voury Zhuohua's VW series of fine-pitch LED displays use high-quality LED driver chips and built-in S-PWM technology, which makes the refresh rate up to 3840Hz and the gray level up to 16bit. When shooting under high-speed shutter conditions, horizontal black scanning appears after the meeting. Line and color block distribution.
The VW series of micro-pitch LED display is Voury Zhuohua's definition of the micro-pitch LED display and control system. It has comfortable brightness, clear and bright display in high-brightness environments, and comfortable viewing in low-brightness environments without glare. At the same time, grayscale and The contrast performance is good, even if the brightness is reduced, the grayscale performance will not be affected, and the color is true. Compared with other screens, the Voury Zhuohua VW series of fine-pitch LED screens can display static scenes as comparable to canvas effects, and can give better results when displaying dynamic videos. The human body is immersive; and it is absolutely silent, and no noise can be heard in front of or behind the screen during operation.
In terms of low brightness and high gray, high contrast, true color performance, thinness and ease of use, Voury Zhuohua VW series of micro-pitch LED screens are at the leading level in the industry. In addition, this product adopts a high-precision modular cabinet to ensure assembly accuracy and display effect, while greatly saving installation time and workload. At the same time, the patented silicone encapsulation technology used in this product has the advantages of high light transmittance, strong anti-vulcanization, anti-UV, anti-blue light, and blocking ultraviolet rays to protect human eyes. It is an advanced technology, outstanding data performance, and user experience. product.
Voury Zhuohua's VW series of micro-pitch LED displays not only have high brightness of 1200cd/m2 and high grayscale up to 16bit, but more importantly, the product also has the characteristics of low brightness and high gray, which guarantees grayscale loss when the brightness is reduced. Small; the gray level is 16bit when the brightness is adjusted to 700cd/m2, and the gray level is 13bit when the brightness is adjusted to 240cd/m2; the characteristics of low brightness and high gray make the Voury Zhuohua VW series of fine-pitch LED displays always be able to Present any picture perfectly and meticulously.
What affects the refresh rate and gray level of the LED display?
We know several core components of the LED display, such as LED switching power supply, LED driver chip, LED lamp beads, etc. For the refresh frequency and gray level of the LED display, the LED driver chip directly determines the visual refresh frequency of the LED display , The performance of gray scale. Among the current LED driver chips, the high-tech technology is "ScrambledPWM (S-PWM) technology". S-PWM technology is an improvement on the traditional pulse width modulation (PWM) technology. Several shorter on-times to increase the overall visual update rate. To further explain, the built-in S-PWM technology of the new generation of LED driver chips can count once per frame (LED die ON→LED die OFF) and break it up into multiple counts on average. , And each divided aliquot can maintain the original On/Off ratio before being broken, as shown in the figure below.
S-PWM technology provides different counting modes, so the image refresh rate can be increased to 64 times. If you switch to S-PWM to increase the image refresh rate, you can easily increase the visual refresh rate by 64 times with a low-level clock (such as 5MHz), and it can reach more than 4,800Hz. Compared with general video, the refresh rate is at least 10 times higher, and it can also avoid the problems of high-frequency electromagnetic interference (EMIissue), over-voltage surge (Overshoot) and under-voltage surge (Undershoot).
The LED display with S-PWM driver chip is photographed with a high-speed shutter of a digital camera, but there is still no horizontal black scan line and color patch distribution (as shown in the figure below). Its visual refresh rate and gray scale performance far surpass LED display screens using traditional switch-type driver chips.
Voury Zhuohua's VW series of fine-pitch LED displays use high-quality LED driver chips and built-in S-PWM technology, which makes the refresh rate up to 3840Hz and the gray level up to 16bit. When shooting under high-speed shutter conditions, horizontal black scanning appears after the meeting. Line and color block distribution.
The VW series of micro-pitch LED display is Voury Zhuohua's definition of the micro-pitch LED display and control system. It has comfortable brightness, clear and bright display in high-brightness environments, and comfortable viewing in low-brightness environments without glare. At the same time, grayscale and The contrast performance is good, even if the brightness is reduced, the grayscale performance will not be affected, and the color is true. Compared with other screens, the Voury Zhuohua VW series of fine-pitch LED screens can display static scenes as comparable to canvas effects, and can give better results when displaying dynamic videos. The human body is immersive; and it is absolutely silent, and no noise can be heard in front of or behind the screen during operation.
In terms of low brightness and high gray, high contrast, true color performance, thinness and ease of use, Voury Zhuohua VW series of micro-pitch LED screens are at the leading level in the industry. In addition, this product adopts a high-precision modular cabinet to ensure assembly accuracy and display effect, while greatly saving installation time and workload. At the same time, the patented silicone encapsulation technology used in this product has the advantages of high light transmittance, strong anti-vulcanization, anti-UV, anti-blue light, and blocking ultraviolet rays to protect human eyes. It is an advanced technology, outstanding data performance, and user experience. product.
