LCD INTERFACES: LVDS and MIPI


Posted July 6, 2022 by microtipstechnology

Two popular high-speed display connection technologies are LVDS and MIPI DSI.
 
A high-speed differential protocol called MIPI, or Mobile Industry Processor Interface, is frequently used in cell phones. The MIPI Display Serial Interface (DSI) technology was developed especially for communicating with displays.

A display data transfer method, LVDS takes advantage of differential signaling at low voltages. LVDS is a thorough signaling specification, but in the display industry, it has come to be equated with the FPD-Link protocol (Flat Panel Display Link). The MIPI DSI and FPD-Link communication protocols use the LVDS standard.

These communication protocols use differential signaling to transfer display data, which speeds data transmission and uses fewer data lines. Since these signals are sent over bidirectional data lanes variously, the display interface requires fewer connections. These interfaces benefit from big monitors, excellent graphics resolution, and quick frame rates.

THE LVDS INTERFACE

Low-Voltage Differential Signaling (LVDS) is a popular option for big LCDs and peripherals that need a lot of bandwidth, including HD graphics and quick frame rates. It is an excellent choice because of its quick data transfer and low voltage.

Signaling for Low Voltage Differential is a balanced digital transmission technique known for its superior signal quality (low noise). A/V equipment, network, peripheral devices, LCD monitors, and automotive systems are just a few examples of the diverse applications for LVDS.

THE MIPI INTERFACE

A high-speed serial link between a host CPU and a display module is defined by the MIPI Display Serial Interface (MIPI DSI). The interface allows for manufacturers' displays' integration to provide high performance, low power, and low electromagnetic interference (EMI) while also lowering the number of pins and retaining vendor compatibility. Designers can use MIPI DSI to transmit stereoscopic content and enable excellent color rendering for the most demanding picture and video situations.

MIPI DSI is frequently used. It is widely used in smartphones, tablets, computers, and hybrid laptops/tablet devices. Additionally, it is being used in wearables, the Internet of Things, and virtual and augmented reality applications in the automobile industry for dashboard displays and in-car infotainment systems.

THE DISTINCTION BETWEEN THE MIPI DSI AND LVDS INTERFACES

• The MIPI DSI interface can broadcast control commands in contrast to the LVDS interface, which can only convey video data.

• The LVDS interface converts the RGB TTL signal into an LVDS signal that may be sent using the SPWG/JEIDA protocol. The MIPI DSI interface delivers the visual data and control data required for screen control following a predetermined handshake sequence and instruction regulations.

• Low voltage differential pair is the signal type used for LVDS interfaces, and the signal's contents include RGB data, line and field synchronization, and clock.

• The content of the LVDS signal, a MIPI DSI interface signal type, contains video stream data and control directives.

CONCLUDING THOUGHT

Low Voltage Differential Signaling, or LVDS, refers to the real voltage and wire impedances. Even within the MIPI standard, several voltage levels exist, so take note of those.

MIPI is the format used for signaling, start and stop sequences, and how different bits are positioned about one another within the data stream. The MIPI standard contains description tables for registering locations in select places (if my memory serves me).

As a result, LVDS is the signal that pushes the formatted bits from Mipi into the actual world.
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Last Updated July 6, 2022