Type-C interface display solution

深圳市禾川兴科技有限公司

Type-C interface display solution [Copy link]

 

It's already 2021, so you still don't know about the desktop monitor with type-c interface, right? Then let me popularize the history of monitors.

The earliest we used was CRT monitor, which used green display and single display tube. It was not only large and bulky, but also had unsatisfactory display effect. At that time, these monitors were cathode ray tube (CRT) monitors, which used hole-shaped shadow masks. The cross-section of the tube was basically spherical, so it was called spherical tube. The screen of this monitor was curved in both horizontal and vertical directions. This curved screen caused image distortion and reflection, and also made the actual display area smaller.


Next, we started to use LCD monitors (liquid crystal display), which have no radiation, full plane, no flicker, no distortion, large visible area, small volume and weight, and strong anti-interference ability.


Next is LED display, which is a display screen that uses the display method of controlling semiconductor light-emitting diodes to display various information such as text, graphics, images, animations, quotes, videos, and video signals. The display effect is much better than LCD.


The interface of the monitor is also constantly improving with the technology. In the past few years, the more familiar one is the VGA interface, which is a special interface for computers to output data using the VGA standard. The VGA interface has 15 pins in total, divided into 3 rows, with 5 holes in each row. It is the most widely used interface type on graphics cards, and most graphics cards have this interface. Of course, some monitors use the DVI interface.

At present, the most familiar interface should be HDMI, which stands for "High Definition Multimedia" in English and means high-definition multimedia interface in Chinese. The HDMI interface can provide up to 5Gbps of data transmission bandwidth, and can transmit uncompressed audio signals and high-resolution video signals. At the same time, there is no need to perform digital/analog or analog/digital conversion before signal transmission, which can ensure the highest quality audio and video signal transmission. Of course, there is also the DP (DisplayPort) interface. DisplayPort is the first display communication port that relies on packet data transmission technology. This packet data transmission technology can be found in technologies such as Ethernet, USB and PCI Express. It can be used for both internal display connections and external display connections.



After briefly talking about other interfaces, we finally come to the protagonist of today, the type-c interface display. Starting from USB3.2, the data protocol must use the type-c interface, and video transmission is no exception. The transmission rate of USB4 has reached 40Gbps. With the DP2.0 protocol, it can output up to 8K @60Hz HDR video.


The type-c interface monitor can not only output videos from mobile phones, laptops, tablets, and Switch to the monitor, but also reverse charge mobile phones, tablets and other devices. Let's take a closer look at the principle. A


single USB Type-C interface, with both DP/USB expansion and DC power supply, is a typical form of desktop monitors. The entire monitor inputs a high-power power supply similar to 24V/3A through the DC interface. In addition to meeting its own power requirements, it can also provide PD fast charging for mobile phones or laptops connected to the monitor through the USB Type-C interface. The maximum reverse output can reach 100W to power the computer. Thanks to the LDR6290 launched by Lederui, it is a dedicated solution designed for this single USB Type-C interface desktop monitor.


The LDR6290 chip is a single USB C port PD3.0 protocol communication chip designed by Lederui Technology, and has the functions of USB port upgrade and Billboard, as well as the function of allowing smart devices to enter Alternate Mode to output DP signals through VDM negotiation. It is particularly suitable for DC-powered desktop monitors and adapter solutions.


The main framework is as follows:

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The above figure illustrates the main framework of LDR6290 from the aspects of Date and Power. First of all, from the perspective of Date, through the protocol communication with the LDR6290 CC PIN, the USB Type-C interface inputs the DP signal and the Date signal, which are given to the relevant functional modules of the single USB Type-C interface desktop display to realize the functions of audio and video display and USB3.0/2.0.


From the perspective of Power, the 22V-32V power input of the DC interface passes through the DC-DC chip and outputs the voltage of 5V-9V-12V-15V-20V from the USB Type-C interface. Of course, the output voltage depends on the communication between the mobile phone or monitor inserted into the single USB Type-C interface desktop display and the CC protocol of LDR6290, and then the FB of the DC-DC chip is controlled by LDR6290.



A dedicated solution for a single USB Type-C interface desktop monitor, part of the LDR6290 circuit is as follows:



This solution is suitable for suppliers who specialize in monitor boards or monitor finished product assemblers.

qwqwqw2088

Monitors also start using type-c interfaces

深圳市禾川兴科技有限公司

qwqwqw2088 posted on 2021-12-4 19:41 The monitor has also started to use the type-c interface

Monitors have been using Type-C ports before this, but it has not really exploded yet.