lcd panel lvds 24 price

WF101LSYAPLNN0 is a 10.1-inch High Brightness LVDS TFT-LCD module, made of resolution 1280x800 pixels. This module is built-in with EK79202B1 driver IC, and it supports LVDS interface. WF101LSYAPLNN0 is adopted IPS panel which is having the advantage of wider view angle of Left:80 / Right:80 / Up:80 / Down:80 degree (typical), contrast ratio 1000:1 (typical value), brightness 1100 nits (typical value), anti-glare surface panel, aspect ratio 16:10. WF101L model is also available in projected capacitive touch screen (PCAP) and resistive touch screen (RTP).

Serial Peripheral Interface (SPI) is a synchronous serial communication interface best-suited for short distances. It was developed by Motorola for components to share data such as flash memory, sensors, Real-Time Clocks, analog-to-digital converters, and more. Because there is no protocol overhead, the transmission runs at relatively high speeds. SPI runs on one master (the side that generates the clock) with one or more slaves, usually the devices outside the central processor. One drawback of SPI is the number of pins required between devices. Each slave added to the master/slave system needs an additional chip select I/O pin on the master. SPI is a great option for small, low-resolution displays including PMOLEDs and smaller LCDs.

Philips Semiconductors invented I2C (Inter-integrated Circuit) or I-squared-C in 1982. It utilizes a multi-master, multi-slave, single-ended, serial computer bus system. Engineers developed I2C for simple peripherals on PCs, like keyboards and mice to then later apply it to displays. Like SPI, it only works for short distances within a device and uses an asynchronous serial port. What sets I2C apart from SPI is that it can support up to 1008 slaves and only requires two wires, serial clock (SCL), and serial data (SDA). Like SPI, I2C also works well with PMOLEDs and smaller LCDs. Many display systems transfer the touch sensor data through I2C.

RGB is used to interface with large color displays. It sends 8 bits of data for each of the three colors, Red Green, and Blue every clock cycle. Since there are 24 bits of data transmitted every clock cycle, at clock rates up to 50 MHz, this interface can drive much larger displays at video frame rates of 60Hz and up.

Low-Voltage Differential Signaling (LVDS) was developed in 1994 and is a popular choice for large LCDs and peripherals in need of high bandwidth, like high-definition graphics and fast frame rates. It is a great solution because of its high speed of data transmission while using low voltage. Two wires carry the signal,  with one wire carrying the exact inverse of its companion. The electric field generated by one wire is neatly concealed by the other, creating much less interference to nearby wireless systems. At the receiver end, a circuit reads the difference (hence the "differential" in the name) in voltage between the wires. As a result, this scheme doesn’t generate noise or gets its signals scrambled by external noise. The interface consists of four, six, or eight pairs of wires, plus a pair carrying the clock and some ground wires. 24-bit color information at the transmitter end is converted to serial information, transmitted quickly over these pairs of cables, then converted back to 24-bit parallel in the receiver, resulting in an interface that is very fast to handle large displays and is very immune to interference.

Mobile Industry Processor Interface (MIPI) is a newer technology that is managed by the MIPI Alliance and has become a popular choice among wearable and mobile developers. MIPI uses similar differential signaling to LVDS by using a clock pair and one to eight pairs of data called lanes. MIPI supports a complex protocol that allows high speed and low power modes, as well as the ability to read data back from the display at lower rates. There are several versions of MIPI for different applications, MIPI DSI being the one for displays.

Two common high-speed communication protocols for displays are MIPI DSI and LVDS. The Mobile Industry Processor Interface, also known as MIPI, is a high-speed differential protocol that is commonly used in cellphones. Specifically, the MIPI Display Serial Interface (DSI) technology is designed for display communication. LVDS is a technique that uses differential signaling at low voltages to transmit display data. While LVDS is a broad technical specification for signaling, it has become synonymous in the display industry with the FPD-Link protocol (Flat Panel Display Link). MIPI DSI and FPD-Link are both communication protocols that use LVDS as their standard.

The MIPI DSI was designed to interface display’s for cellphones and smart devices and is the most common connection interface for these devices today. This interface uses LVDS signaling over a D-PHY layer to communicate with the display over two or four data pairs. In addition to the data lines, the MIPI interface has a differential clock pair that times the signals at a high frequency.

These clock and data lanes are triggered at low voltages which make these displays low powered. Because this interface can signal data at a very high speed, a large amount of data can be sent over the minimum frame rate requirements. This means that MIPI interface displays can be high resolution, render high color, and can be used for high-speed applications such as video transmission. Below is an example of a Focus LCDs MIPI interfaced display,. This display is a 4.3” TFT with 480x800 pixels and is connected through a 2-lane MIPI interface. Additional features of this display are reviewed below.

The Flat Panel Display Link interface (FPD-Link) has become synonymous with the LVDS interface in the display industry. The LVDS interface explained in this note will be in reference to the FPD-Link protocol. This protocol was the original high speed display interface that uses differential signaling at very low voltages to transmit data at a high frequency. This interface is most commonly used for connecting laptops and televisions to their graphics controllers. The LVDS interface transmits data over four differential data pairs six or eight bits at a time.

One example of a display that is connected through an LVDS interface is E70RA-HW520-C. This display is a 7.0” TFT with 1024x600 pixels and can display up to 16.7M colors. This display has embedded gate and a source driver IC’s that can be programmed from a standard graphics controller. Below are additional features of this LVDS display.

The display communicates over an LVDS interface to an attached HDMI module, which supports the gate and driver signaling as well as the capacitive touch interface. The LVDS interface of this display accepts RGB data in sequences of six or eight bits corresponding to the 16-bit, 18-bit and 24-bit color depths. This display has four differential data pairs and one differential clock pair.

Similar to the MIPI DSI interface, this protocol is low voltage and uses differential signaling. Additionally, this interface has low EMI noise and has a high frequency. This display operates at a clock frequency of 65MHz for the LVDS interface. The clock frequency is determined by the interface capabilities and the resolution of the display in order to maintain a refresh rate of 60Hz.

Below is a description of each of the pins that you can find on an LVDS interface display. This is a typical pin configuration for an LVDS interface display. It is important to verify that the pin connection matches with the graphics controller before connection because some LVDS displays may have alternative pin mappings and features.

The LVDS interface for displays reduces the pin count of the RGB signals to a few differential pairs. This is beneficial for hardware connection while still maintaining the large amount of data transmitted. The differential signaling also reduces EMI noise because the signals are equal and opposite and cancel out electromagnetic radiation effects. Another benefit for LVDS displays is the standard pinout for the connection cable. This makes these displays accessible to many graphic controllers and predesigned systems.

As technology advances with display communication interfaces, so do the methods of reducing the complexity of the system. MIPI DSI and LVDS have collaborated with VESA (Video Electronics Standards Association) to integrate video compression with their interfaces, which reduces the memory constraint of the display. The display technology itself is low cost, power efficient and high performing. The devices used to communicate with these displays are making progress on reducing cost and increasing availability over time.

Buyers and others who are developing systems that incorporate FocusLCDs products (collectively, “Designers”) understand and agree that Designers remain responsible for using their independent analysis, evaluation and judgment in designing their applications and that Designers have full and exclusive responsibility to assure the safety of Designers" applications and compliance of their applications (and of all FocusLCDs products used in or for Designers’ applications) with all applicable regulations, laws and other applicable requirements.

Designer agrees that prior to using or distributing any applications that include FocusLCDs products, Designer will thoroughly test such applications and the functionality of such FocusLCDs products as used in such applications.

Everywhere we go, whether the airport, retail store or inside our vehicles, LCD displays are a huge part of our everyday life. From providing us with data regarding weather, GPS information or just entertainment, LCD’s are everywhere, but how are these various displays interfaced?

The first interface we will look at will be Low Voltage Differential Signaling or more commonly known as LVDS. Introduced in 1994, this interface was extremely popular for many years in LCD displays. There are 2 standards that govern LVDS, 1) ANSI/TIA/EIA-644 and 2) IEEE. LVDS has a high-speed capability which can reach Gbps to extend the full physical distance while maintaining signal integrity. Minimized EMI and high noise immunity, skew and low jitter are some benefits. Other benefits from using LVDS are low power, low cost, small footprint and simple implementation. LVDS supports data, clock and control signals. LVDS is activated by 3.5mA constant current along with the transmission of high-speed differential signal data that carries an exceptionally low voltage swing of 350mV terminated with a 100Ω load, see Fig 1.

There are 7-bit data streams (28 bit of data (4 x7=28)) of incoming data streams to the serializer (Tx), converted to LVDS and sent to de-serializer (Rx), see Fig 2. Clock signals are usually sent separately.

LVDS displays can vary a lot. LVDS displays are not governed by a set of well defined rules like MIPI DSI displays are. Therefore, it is up to the LCD manufacturer and the LVDS display driver IC manufacturer to use LVDS interface as they please, as long as they follow the physical interface and logic levels.

Based on this data, we can pick an LVDS transmitter IC. SN75LVDS84 from Texas Instruments is great for use with LCD displays that can be driven by an STM32.