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The Differences Between MIPI CSI And MIPI DSI

Views: 515     Author: Reshine Display     Publish Time: 2023-12-07      Origin: Site


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The Differences Between MIPI CSI And MIPI DSI

The ability of the MIPI CSI and DSI interfaces to transmit data at a very fast rate contributes to their high performance. As a result, a large amount of data that exceeds standard minimal frame rate requirements can be transferred. This means that MIPI interfaces can be used for high-speed applications such as high-resolution video with excellent color rendering. The Camera Serial Interface (CSI) and Display Serial Interface (DSI) specifications were developed by the Mobile Industry Processor Interface (MIPI) Alliance.

1. Camera Serial Interface (CSI) and Display Serial Interface (DSI) specifications

The interaction between a host CPU and a camera is described by CSI. The most recent active interface specifications are CSI-2 v3.0, CSI-3 v1.1, and CCS v1.0, which were released in 2019, 2014, and 2017, respectively. CSI is used in advanced driver assistance systems (ADAS), imaging, biometric recognition, context awareness, surveillance, machine vision, and in-vehicle entertainment.

The MIPI DSI interface standard reduces the number of pins to simplify the design while still ensuring vendor compatibility. MIPI DSI has two levels of communication. The interface layer is in charge of low-level communication, while the packet layer is in charge of high-level communication. At the interface level, both can operate in high-speed or low-speed modes. Smartphones, tablets, smartwatches, and other embedded display applications use the MIPI DSI interface. MIPI DSI and CSI both have low EMI, excellent performance, and low power consumption.

2. There are three MIPI Camera Serial Interface models: CSI-1, CSI-2, and CSI-3

CSI-1 was the first MIPI interface for cameras. It was designed to specify how a camera would connect to a host processor. It was superseded by the still-in-development MIPI CSI-2 and MIPI CSI-3 standards. CSI-2 was released in 2005, and it consisted of several layers, including pixel-to-byte, Conversion Layer, Application Layer, Physical Layer (C-PHY/D-PHY), Lane Merger Layer, and Low-Level Protocol Layers. In April 2017, the CSI-2 v2.0 standard was made public. CSI-2 version 2.0 added support for RAW-16 and RAW-20 color depths, as well as an increase in virtual channels from 4 to 32, Latency Reduction and Transport Efficiency (LRTE), Differential Pulse-Code Modulation (DPCM) compression, and scrambling to reduce Power Spectral Density. Finally, MIPI CSI-3 is a high-speed, bidirectional protocol that is primarily designed for image and video transmission between cameras and hosts in a multi-layered, peer-to-peer, UniPro-based M-PHY device network. It was first released in 2012, followed by version 1.1 in 2014.

3. The DSI communications protocol specifies two distinct sets of instructions

The first defines the structure of the Display Command Set (DCS), which is a set of standard commands used to manage the display device. It describes register addresses as well as how they work. Sleep, enable, and reverse display commands are included. The device manufacturer defines a second, device-specific command space, the Maker Command Set (MCS). It frequently includes instructions for tasks not covered by the DSI standard, such as setting specific device registers (such as gamma correction) or programming non-volatile memory. 

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MIPI CSI is a widely used high-speed protocol for transmitting still and video images from image sensors to application processors, whereas DSI is a scalable and forward-thinking high-speed interface that defines the high-bandwidth connection between host CPUs and displays. Both standards are critical to comprehend when designing modern devices capable of capturing or displaying video with the associated quality hardware available at FocusLCDs.

4. The MIPI-DSI Interface: Everything You Need to Know

The high-speed MIPI DSI interface is used by smartphones, tablets, smartwatches, and other embedded display applications. The Mobile Industry Processor Interface Alliance (MIPI) developed the Display Serial Interface, or DSI, as a serial communication protocol. MIPI DSI has low EMI, excellent performance, and low power data transfer. Furthermore, the interface standard reduces the number of pins to reduce design complexity while maintaining vendor compatibility.

MIPI has two communication layers. The interface layer handles low-level communication, while the packet layer handles high-level communication. Both can operate in low-speed or high-speed interface modes. There are two types of levels: packet and interface.

While the interface level displays the speed and power settings of the display, the packet level comes into play when sending image data to the DSI display in either short 4-byte or large (6-64.451-byte) packets. Each packet type contains data, size, and error connection information. It is best to send commands in small packets without any visual data. Long commands, on the other hand, are ideal for sending commands with multiple data bytes, such as an image stream.

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The MIPI DSI communication protocol has two distinct operating modes: video mode and command mode. A display controller with no internal memory must use video mode. It only works in high-speed mode, sending a constant stream of data from the processor to the display. When in video mode, the processor sends data to the interface display in the form of live pixel streams (which are refreshed continuously). Orders are sent to recognized display registers in command mode.

It can also use short or long packets and run at high or low speeds. Because it requires display registers, the command mode can only be used on screens that have RAM for the frame buffer. Because registers or display memory only require two bytes of data, it frequently operates by sending short packets.

MIPI DSI displays have high-level graphics as well as less complicated signal routing, PCB designs, and higher hardware costs. The MIPI interface uses low-voltage differential signaling to transmit data at high frequencies of up to 1 GB/s. For communication, low-voltage signaling is used, which has the advantage of consuming little power. Designers can use the MIPI DSI protocol to combine high-speed, low-power, and low-EMI displays via an efficient interface. The MIPI DSI interface may operate at extremely low power levels to extend battery life. These displays emit very little electromagnetic interference because they use equal amounts of positive and negative data and clock lanes for signaling. This interface can be used at a variety of data transmission rates to further reduce interference on auxiliary devices. MIPI is a popular choice in the display industry because it provides high resolutions and color depths without increasing the number of required data lines. Display applications benefit from the simplicity of connectivity, which reduces system complexity and overall cost.

The MIPI DSI interface is widely used in consumer devices such as VR headsets, video game consoles, tablets, and mobile phones, which is unsurprising given the standard's many advantages such as affordability, simplified pin layouts, low EMI, and power consumption. We appreciate your interest and look forward to answering your questions and completing your project with you. Welcome to contact Reshine Display Manufacturer for more information!

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