tft display rgb interface in stock

Kingtech 800x480 /WVGA 7 inch TFT LCD display is a common size in the market, the supply is in full stock and stable. The 7 inch TFT screen has the existing resistive touch and capacitive touch. The 7 inch TFT LCD module has HDMI Board. This 7inch TFT display can reach 1000nits and can be sunlight readable.

Kingtech Diaplay has achieved great progress in LCD production and promises to provide the customers with qualified standard displays and satisfying one-stop services. Any requests will be welcomed.

Application of 24bit RGB Interface 800x480 7 "TFT displayThe 800x480 / WVGA 7inch TFT LCD display can be used for medical devices, handheld equipment, industrial control, smart home, Navigator, and E-bike.

In this Display 101 article we discuss thedigital parallelRGB LCD display interface and how the row and column driving signals are generated from the digital parallel RGB interface.

An LCD display consists of an array of liquid crystal segments. The crystal itself doesn’t emit light. With no electrical field, crystals organize in a random pattern. When an electric field is applied, the crystals align to the electrical field. Various strength of electric fields works like a “gate” to pass different intensity of backlight through the crystals. If the crystals are aligned perpendicular to the backlight, then the backlight can’t pass through the crystals. [1]

How to generate a specific color for a pixel? Each pixel is composed of 3 segments that individually pass light through a red, green, and blue filter, to make an RGB display color pixel. For a 320*240 RGB TFT display, there are 960 (320*3) columns and 240 rows.

Most LCD displays have a digital parallel RGB interface. It works between the graphic controller as a signal source and the input of the RGB display module.

The image data is transmitted digitally as “0 ”or “1 “ by TTL voltage levels. For the RGB interface, each of the signals has a corresponding line. Below are the signal connections of the LCD RGB display interface of 24 bits per pixel.

The same principle is applied to the HSYNC syncpulse, marked with HBP and HFP. The HSYNC pulse is responsible for a new row.Between twoHSyncpulses, the grey level RGB color data for one row (line) needs to be transmitted.[4]

This 3.0" full-colour circular IPS TFT display module features wide operating temperature, high brightness, high contrat ratio and all round viewing angles. Its round outline and wide operating temperature make it suitable for Automotive, Marine, Industrial and Medical applications.

Although circular displays come at a premium price compared to the more traditional rectangular shapes, we can offer modules, with or without touchscreen with affordable NRE and tooling cost structure for industrial applications.

These displays do come with minimum MOQs, so even if your project does not meet these we can offer cost-effective customised coverlens solutions and enclosures which achieve acircular look and feel, just contact us to talk through your project and we can guide you through your options.

All our displays can be customised by our in-house engineering team to meet your application requirements, from optical enhancements, antimicrobial coating, touch optimisation to hardware, software and mechanical integration. Discover all our design services here.

Display size, contrast, color, brightness, resolution, and power are key factors in choosing the right display technology for your application. However, making the right choice in how you feed the information to the display is just as vital, and there are many interface options available.

All displays work in a similar manner. In a very basic explanation, they all have many rows and columns of pixels driven by a controller that communicates with each pixel to emit the brightness and color needed to make up the transmitted image. In some devices, the pixels are diodes that light up when current flows (PMOLEDs and AMOLEDs), and in other electronics, the pixel acts as a shutter to let some of the light from a backlight visible. In all cases, a memory array stores the image information that travels to the display through an interface.

According to Wikipedia, "an interface is a shared boundary across which two separate components of a computer system exchange information. The exchange can be between software, computer hardware, peripheral devices, humans, and combinations of these. Some computer hardware devices such as a touchscreen can both send and receive data through the interface, while others such as a mouse or microphone may only provide an interface to send data to a given system.” In other words, an interface is something that facilitates communication between two objects. Although display interfaces serve a similar purpose, how that communication occurs varies widely.

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.

Display components stretch the limitations of bandwidth. For perspective, the most common internet bandwidth in a residential home runs on average at around 20 megabits per second or 20 billion 1s and 0s per second. Even small displays can require 4MB per second, which is a lot of data in what is often a tightly constrained physical space.

Take the same PMOLED display with the 128 x 128 resolution and 16,384 separate diodes; it requires information as to when and how brightly to illuminate each pixel. For a display with only 16 shades, it takes 4 bits of data. 128 x 128 x 4 = 65,536 bits for one frame. Now multiply it by the 60Hz, and you get a bandwidth of 4 megabits/second for a small monochrome display.