As we all know, the small-pitch LED display is currently one of the most popular large-screen display devices indoors. It is often used in high-end conference rooms, advanced exhibition halls, big data visualization platforms, command and monitoring centers, etc., in order to let everyone know more about the small-pitch LEDs. Display screen, then Winbond Ying Optoelectronics will introduce to you the key technologies of small-pitch led display screens and some precautions for use.
Small pitch led display
The LED display of the image uses an electronic light-emitting system to display the result of the image conversion of the digital signal. The special video card JMC-LED came into being, and formed a unified compatibility with VGA and video functions based on the use of a 64-bit graphics accelerator on the PCI bus, so that the video data was superimposed on the VGA data, and the lack of compatibility was improved. Using the full-screen method to capture the resolution, the video image can achieve full-angle resolution and enhance the resolution effect, eliminate the problem of edge blur, and can zoom and move the image at any time, and can respond to different playback requirements in time. Effectively separate the three colors of red, green and blue, and enhance the true color imaging effect of the electronic display.
Real image color reproduction
Under normal circumstances, the three color combinations of red, green and blue should satisfy the light intensity ratio tending to 3:6:1; the red imaging sensitivity is stronger, so the red in the space display must be evenly dispersed; because the light intensities of the three colors are different, The resolution nonlinear curve presented by people's visual experience is also different. Therefore, it is necessary to take advantage of the white light of different light intensities to correct the internal light of the TV; the color resolution ability is different due to personal differences and environmental differences, and color reproduction needs to be performed according to certain objective indicators, such as:
(1) Position the basic wavelength of 660nm red light, 525nm green light, and 470nm blue light.
(2) According to the actual situation of light intensity, use 4 tubes or more than 4 white light units for matching.
(3) The gray scale is 256 levels.
(4) LED pixels must be processed with non-linear proofreading. The three-color piping can be controlled by the cooperation of the hardware system and the playback system software. 4
Brightness control D/T conversion
The controller is used to control the light emission of the pixels to promote the independence of driving. When a color video needs to be presented, the brightness and color of each pixel must be effectively controlled, and the scanning operation must be completed synchronously within a specified time. But the large-scale LED electronic display screen has thousands of pixels, which increases the complexity of control and the difficulty of data transmission. However, it is unrealistic to use D/A to control each pixel in actual work. At this time, a brand-new control scheme is needed to meet the complex requirements of the pixel system. Based on the analysis of visual principles, the brightness/off ratio of pixel points is the main basis for people to analyze the average brightness, and effective adjustment of this ratio can achieve effective control of pixel brightness. When this principle is applied in the LED electronic display screen, the digital signal can be converted to the time signal, and the effective conversion between D/A can be realized.
Data reconstruction and storage
At present, the combined pixel method and the flat pixel method are common memory combination methods. Among them, the bit plane method has more obvious advantages, which effectively improves the best display effect of the LED screen. The circuit is reconstructed by bit-plane data, RGB data is converted, different pixels in the same weight bit are organically combined, and the adjacent storage structure is used for data storage.
ISP in logic circuit design
With the emergence of System Programmable Technology (ISP), users can repeatedly repair the deficiencies in the design and design their own goals, systems or circuit boards, and realize the designer application functions of software integration. At this time, digital systems and system programmable technologies The combination brings new application effects. The introduction and use of new technologies effectively shortens the design time, expands the limited use of components, simplifies on-site maintenance, and facilitates the realization of target equipment functions. When the system software is inputting logic, the influence of the selected device can be ignored, and the input component can be selected at will, or the virtual component can be selected, and the adaptation can be performed after the input is completed.
Small pitch led display
When turning on the screen: turn on first, then turn on the screen.
When turning off the screen: turn off the screen first, then turn off.
(Turn off the computer first without turning off the display screen, it will cause the screen body to appear bright spots, the LED will burn the lamp tube, and the consequences will be serious.)
2. The interval of switching screens should be greater than 5 minutes.
3. After the computer enters the engineering control software, the screen can be turned on.
4. Avoid turning on the screen in a completely white screen state, because the impact current of the system is the largest at this time.
5. Avoid turning on the screen in an out of control state, because the inrush current of the system is the largest at this time.
6. When there is a very bright line in a part of the electronic display, you should turn off the screen in time. It is not advisable to turn on the screen for a long time in this state.
7. The power switch of the display screen often trips, and the screen body should be checked or the power switch should be replaced in time.
8. Regularly check the firmness of the hooks. If there is any looseness, pay attention to timely adjustment, re-reinforce or update the hanging parts.
9. When the ambient temperature is too high or the heat dissipation conditions are not good, the LED lighting should be careful not to turn on the screen for a long time.
