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LAPIS Technology"s display drivers realize uniform and fast pixel charging for 8K 120Hz, 75-inch, and larger panels with the unique technology of panel load charging.

LAPIS Technology"s display drivers use high-speed point-to-point interface technology *2 (4Gbps), which enables large amounts of display data transfer in a short time.Our products have been used in many panels with high refresh rates such as 360Hz.

In chapter 7, we made use of the segmented LCD display on the Wonder Gecko Starter Kit through the use of a pre-built LCD library and driver when designing the user interface for the sprinkler timer. That made things easy for us, and we didn’t really need to dwell on how the driver worked. In this chapter, we will dig into some of those details so that we can connect the EFM32 to any kind of display we choose.

The display we will be using for this chapter is the Adafruit 2.8” 240x320 TFT LCD Capacitive Touch screen, shown below. We will interface with it over SPI for transferring image data and I2C for reading the touch interface. We will learn how to interface with it with our own drivers and build our own simple graphics libraries, as well.

Segmented Display: We have already worked with the segmented LCD display in chapter 7, also known as a character display. In such a display, there are a fixed matrix of LCD segments that are preconfigured in hardware to convey specific information. They are not flexible enough to display an image, but they don’t require many pins on the MCU and are easier to program. For example, the number “9” can be formed on such a display with as few as 6 signals.

Note that a new “Memory LCD” described in Silicon Labs application note AN0048 couples a memory device within each pixel so that constant refreshing is not necessary, reducing power consumption as well.

Graphical display screens have many different technologies, from passive-matrix Liquid Crystal Display (LCD) or active-matrix Thin Film Transistor (TFT) LCD, Light Emitting Diode (LED), or Organic LED (OLED). Display technology is not the focus of this chapter. No matter which technology you choose, you will still need to understand the topics of this chapter in order to display your images.

A display is a layered device, with each part customizable by the manufacturer. The display is constructed on top of a circuit board which houses the connector and any controller chips that are necessary. The backlight is located on top of the circuit board, with the pixel matrix sitting on top of the backlight. The touch sensor is optional and is located at the top of the stackup.

The LCD pixel matrix is the heart of the display. This part is responsible for displaying the image and, in the case of LCD displays, it will either allow or prevent light from a backlight to pass through. In the case of LED displays, the pixel matrix produces the light and forms the image in one step. No matter the process, the pixel matrix is comprised of an array of pixels in height and width of a certain color depth that make up the display. For the display used in this chapter, the color depth is 18 bits, consisting of 6 bits each for the red/blue/green components of a pixel. That means that the information required to paint the screen one time is 240 bits wide x 320 bits tall x 18 bits of color = 172,800 bytes. That’s a lot of data, and it is more data than we can hold in the RAM of the Wonder Gecko MCU. Therefore, it will require some intelligent code to drive the display or an external memory buffer to store the image data.

The backlight is necessary for TFT LCD displays to allow the display to be seen. Without a backlight, a color TFT LCD will show no image. A monochrome LCD is a little different, since the segments can be seen if they are in the “on” state. The brightness of an LCD screen is sometimes controlled by applying a Pulse Width Modulated (PWM) signal to a pin (or pins) that controls the LED backlight. This is exactly what we have already done in the last chapter to dim an LED.

A display driver chip is used to drive 76,800 signals by rotating through all horizontal and vertical scan lines many times per second. This component is an optional component of the display, and if it is present, it dramatically reduces work for the MCU to display (and continue to display) an image on the screen.

A frame buffer is a block of RAM that holds all of the color information for every pixel (172 kB for this display) that is used to paint a single image (or “frame”) to the display. This buffer is required to exist somewhere in the system because it is used by the display driver chip to refresh the LCD image many times per second.

A touch interface is an optional component and will often have its own control chip or control signals that are separate from the display driver chip.

In a general sense, all display architectures require the above control blocks. The display contains a number of scan lines (depending on the resolution) and an image driver that must continually feed the scan control circuitry with pixel data, even for a static image. The pixel control allows light to pass for an instant, and then the pixel goes dark again. If the scan control circuitry were stopped, the display would turn dark, as all pixels would be turned off. Therefore, the image driver needs a frame buffer of memory somewhere in the system to fetch the pixel data that is needed for every scan. The application fills the frame buffer as new drawing operations change what is to be displayed on the screen.

In the RGB interface mode, the MCU acts as the image driver. This means that it must constantly drive data to the display, refreshing all 320 x 240 pixels many times per second. You can imagine the amount of work that would require of your MCU. If the frame buffer is too big to fit in the MCU RAM, an external memory chip must be used. The frame buffer can be attached to the MCU via serial interfaces such as I2C or SPI for static images such as device menus, but must utilize a parallel interface in order to keep up with the demands of full motion video. The External Bus Interface (EBI) can be used with external memory for maximum speed and ease of use, as long as your particular model of EFM32 supports it. EBI extends the RAM of your EFM32 and allows you to address external memory as if it resides within the RAM address space of the EFM32 itself.

When a display has an integrated device driver chip and frame buffer (such as the Ilitek ILI9341 used in this chapter), the MCU doesn’t have to perform all of the constant refreshing of the display; it only sends data to the driver chip when the image changes. This enables the MCU to offload all of that work to stay focused on the application at hand rather than driving the display.

These driver chips usually offer both parallel and serial interfaces to receive image data from the MCU. Parallel interfaces are required if the display will be used for full-motion video and require 8 or more data interface pins. Serial interfaces can be used for static images like device menus and only require 3 or 4 interface data pins.

There are displays available on the market (such as the EVE series from FTDI) which go well beyond a display driver chip. They contain the ability to create graphical shapes such as lines, rectangles, and circles, as well as device controls such as windows, sliders, and buttons. These displays can even offer an integrated touch controller and audio capabilities. The displays communicate over I2C or SPI, and the data that is sent is similar to a software Application Programming Interface (API). The specs of such displays define the commands that the controller chip accepts, and the application software simply communicates each graphic primitive one-by-one to the display to paint the appropriate picture on the screen. These types of displays can be easier to program, but are not the focus of this chapter.

At the bottom of the software stack, the device driver is the necessary code that customizes your graphics library for your particular display device architecture and physical hardware connection. (Note that a software device driver is not the same thing as the device driver chip on the physical display.) Graphics libraries are flexible, and can be adapted to many different display architectures, but they need to be configured for your display architecture and MCU. The device driver provides this customization, providing the display’s resolution and color depth, mapping the data bus for the display to GPIO pins on your MCU and setting up the memory for the frame buffer (if applicable).

This 2.0” LCD display adopts ST7789V driver chip and has 320*240 color pixels (RGB565), performing excellently in the angle of view (80/80/80/80). It supports SPI(4-wire) communication mode and GDI port (work with main-controllers with GDI), plug, and play. The module can be powered by 3.3V~5V, compatible with multiple main-controllers like Arduino UNO, Leonardo, ESP32, ESP8266, FireBeetle M0, and so on. Use the GDI interface to work with M0, which could effectively reduce wiring steps. Besides, there is an onboard MicroSD card slot for displaying more pictures.

Tokyo, Japan, February 18, 2005 -- Oki Electric Industry Co., Ltd. (TSE: 6703) today announced it has signed a contract to acquire the driver chip business for large TFT-LCDs from Texas Instruments Japan Ltd. This acquisition is part of Oki"s growth strategy to enhance the large TFT LCD driver chip business, which is considered to be one of Oki"s unique semiconductor businesses. With the transfer planned for the end of March 2005, Oki will take in all the customers and employees of Japan TI.