Text. Jerry Han/Jeffrey Kwon
Today, many high-end mobile phones support high-pixel photography, mobile digital TV, MPEG-4 video playback, and video conferencing. In order to improve the display quality of mobile phones, designers generally use red, green and blue (RGB) light-emitting diode ( LED ) backlight technology. Although this new technology can significantly enhance the color gamut of the display, it is much more difficult than the white LED for the actual design. This article will introduce the functional advantages and design challenges of RGB backlighting and the best solution for driving RGB LED backlights on mobile phone displays.
Portable device applications generally contain multiple subsystems. As the size of the display continues to increase, the quality of the display becomes a weapon for differentiation in the market. Several important components of a mobile phone, including backlights, color management chips, flash LEDs, and display interfaces, can affect the overall quality of the display.
Fidelity/energy saving/size is indispensable
In the challenges faced by backlighting designs for portable devices, the color gamut can affect the "fidelity" of the picture.
Consumers want the picture displayed on the portable device to be as close as possible to the real or live view. At the same time, the power consumption of the display can not be too large to affect the use time of the mobile phone, so the energy-saving technology of the display is also important. In addition, display size is an important consideration from a portable device perspective. Therefore, in order to meet the needs of the market and design successful products, today's engineers must overcome the severe challenges.
Although cold cathode fluorescent lamps (CCFLs)/white light emitting diodes (WLEDs) are currently the most common display backlighting design technology, RGB LED backlighting design is rapidly emerging. The advantages and disadvantages of these two backlighting technologies and the design challenges they face will be evaluated separately below.
RGB fully meets the needs of use
At present, most CCFL-lit displays can cover 40 to 76% of the color TV broadcast standard (NTSC) color gamut, while RGB LED backlights display NTSC gamut coverage can exceed 100%. The difference can be distinguished by the naked eye.
But for the more high-end mobile displays, there are several major design challenges: how can you reproduce the most realistic images? How to achieve high image quality under high efficiency and small size? And how to solve the backlight design problem of the flip phone and the cap phone.
In general, a white LED contains a blue or near-ultraviolet light-emitting chip coated with a phosphor material that absorbs light emitted from the LED and emits it at a longer wavelength. However, more than half of the photons produced by the phosphor are scattered back to the LED chip , causing a significant portion of the light to be absorbed, resulting in a reduction in the overall light output of the white LED (Figure 1).
Figure 1 Typical emission spectrum of a phosphorus-containing white LED
White LEDs have a strong blue-ray peak and a relatively low-luminosity phosphorescent peak than blue light, and different combinations of blue and yellow light intensity can produce different light-frequency colors, which can make the colors appear whiter or compare. blue.
As shown in Figure 2, the spectrum of the white LED does not match the color filter of the color LCD, resulting in partial energy dissipation. In addition, since gamma correction must be performed for the spectrum of the WLED, the depth of the color is lost, especially in the red portion.
Figure 2 Spectrum distribution of WLED and color LED filters
The RGB LED response (Figure 3) has three peaks, one from red, blue, and green. The amplitude of each peak can be independently controlled. From the comparison of the spectrum, it can be seen that the white LED has a weak response in the red spectrum range, so the visual sensitivity in this range is also low.
5G Outdoor CPE (Customer Premises Equipment) refers to 5G user terminal equipment used in outdoor environments. It is a device that connects to a 5G network and provides wireless network connectivity, which can be used in various scenarios such as homes, businesses, and public places. The features and advantages of 5G Outdoor CPE are described in detail below.
First, features:
1. High-speed connection: 5G Outdoor CPE uses 5G technology, with higher transmission rates and lower latency. It can provide faster download and upload speeds than 4G networks, meeting users' needs for high-speed networks.
2. Large capacity: 5G Outdoor CPE supports more device connections, which can meet the needs of multiple users at the same time. It provides a higher network capacity and supports more terminal devices. It is suitable for scenarios where multiple devices need to be connected to a home or enterprise.
3. Wide coverage: 5G Outdoor CPE has wider coverage, which can provide better signal coverage and stability. It is suitable for outdoor environments and can provide better network connectivity in outdoor locations, whether in urban, rural or remote areas, with good signal coverage.
4. High reliability: 5G Outdoor CPE adopts a variety of technologies to improve network reliability, such as Multiple-Input Multiple-Output (MIMO) technology and Beamforming technology. It can provide a more stable and reliable network connection and reduce the risk of network outages and failures.
5. Flexible deployment: 5G Outdoor CPE can be flexibly deployed according to actual requirements. It can be installed on the exterior walls of buildings, roofs, telephone poles, etc., to maximize signal coverage. At the same time, 5G Outdoor CPE also supports a variety of installation methods, such as wall hanging, pole, etc., to adapt to different installation environments.
6. Simplified management: 5G Outdoor CPE supports remote management and monitoring, and can centrally manage devices through the cloud platform. Administrators can monitor device running status, troubleshoot and upgrade devices anytime and anywhere to improve management efficiency and O&M effect.
2. Advantages:
1. High-speed network experience: 5G Outdoor CPE can provide faster network speed and lower latency, and users can enjoy a smoother network experience. Whether watching HD videos, playing online games or downloading large files, you can get faster response times and higher transfer rates.
2. Multi-device connection: 5G Outdoor CPE supports more device connections, which can meet the needs of multiple devices in homes, enterprises and other places to access the Internet at the same time. Whether it is a smartphone, tablet, TV, camera or other smart device, it can be connected to the network through 5G Outdoor CPE to achieve connectivity.
3. Stable and reliable: 5G Outdoor CPE uses a variety of technologies to improve network stability and reliability. It can provide a more stable network connection by automatically selecting the best channel and automatically optimizing the signal. At the same time, 5G Outdoor CPE also supports backup and failover functions. When the primary device fails, it can be automatically switched to the standby device to ensure network continuity and stability.
4. Wide coverage capability: 5G Outdoor CPE has a wider coverage range, which can provide better signal coverage and expansion capability. It can cover a larger area and meet the network needs of different places. Whether in urban, rural or remote areas, you can get a stable Internet connection.
5. Flexible deployment and management: 5G Outdoor CPE can be flexibly deployed and managed according to actual requirements. It can be installed in different locations to maximize signal coverage. At the same time, 5G Outdoor CPE supports remote management and monitoring, and can centrally manage devices through the cloud platform, improving the management efficiency and operation and maintenance effect of devices.
In SUMMARY:
As a 5G user terminal device used in Outdoor environments, 5G Outdoor CPE has the features and advantages of high-speed connection, large capacity, wide coverage, high reliability, flexible deployment, and simplified management. It can provide faster network speed and lower latency to meet the needs of users for high-speed network; Support more device connections to meet the needs of multiple users at the same time; With wider coverage, providing better signal coverage and stability; Use a variety of technologies to improve network reliability and reduce the risk of network outages and failures; It can be flexibly deployed according to actual requirements to adapt to different installation environments. Supports remote management and monitoring, improving device management efficiency and O&M effect. The emergence of 5G Outdoor CPE will further promote the development of 5G networks and provide users with a better network experience.
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Shenzhen MovingComm Technology Co., Ltd. , https://www.movingcommiot.com