Why are SPl Interfaces less common with TFTs

Why are SPl Interfaces less common with TFTs

Feb 28th 2023

Thin Film Transistors (TFTs) are less widespread than other types of displays and components in terms of serial peripheral interfaces (SPI) for various reasons. One of the main causes is that SPI is a form of communication protocol intended to communicate with peripheral devices, such as sensors, memory, and other microcontrollers, but TFTs are built particularly for display applications. TFTs are designed to control how much light enters each pixel, which necessitates a different interface than that used for inter-device communication.

TFTs frequently require higher bandwidth communication than what is feasible with SPI, which is another reason why SPI is less popular with TFTs. High-resolution screens that use TFTs have real-time data transmission requirements that can be difficult for SPI to handle. Due to their higher bandwidth capacities, other communication protocols, including MIPI and LVDS, may be better appropriate for TFTs in these circumstances.

TFTs frequently demand a control interface that is more complicated than what is possible with SPI. TFTs require a more complex control interface than what is achievable with SPI since each pixel's brightness, contrast, and color must be able to be set and controlled. As a result, TFTs frequently use more sophisticated communication protocols, including Display Serial Interface (DSI) or DisplayPort, which give TFTs the capability they require.

Power consumption is another element that limits the use of SPI with TFTs. TFTs are used in portable devices like smartphones and laptops, where battery consumption is a major problem. Although SPI is renowned for its low power usage, the amount of data that must be transferred makes it unlikely to be appropriate for TFTs. Other communication protocols, including MIPI, are utilized in these circumstances to reduce power consumption while still delivering the required bandwidth for TFTs.

Last but not least, the cost is a consideration that limits the use of SPI with TFTs. TFTs are relatively expensive to manufacture compared to other types of displays; adding an SPI interface may raise the price even further. As a result, designers may choose more affordable communication protocols, like LVDS, for TFTs.

While SPI is a popular communication protocol for interfacing with peripheral devices, it is less common with TFTs due to the design of TFTs for display applications, the requirement for high bandwidth communication, the need for a more complex control interface, power consumption concerns, and cost. While SPI may not be the most suitable protocol for TFTs in all cases, it remains a popular and versatile protocol for interfacing with a wide range of peripheral devices. If you still have any questions, please get in touch with us here at FocusLCDs; we are excited to partner with you to ensure your next display project succeeds.