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LCD-TFT (LTDC) display controller description

3.2

Flexible timings and hardware interface

Thanks to its timings and hardware interface flexibility, the LCD-TFT controller is able to

drive several monitors with different resolutions and signal polarities.

3.2.1

LCD-TFT pins and signal interface

To drive LCD-TFT displays, the LTDC provides up to 28 signals using simple 3.3 V signaling

including:

•

Pixel clock LCD_CLK.

•

Data enable LCD_DE.

•

Synchronization signals (LCD_HSYNC and LCD_VSYNC).

•

Pixel data RGB888.

Note:

The LTDC controller may support other display technologies if their interface is compatible.

The LTDC interface output signals are illustrated in Table 6.

Other signals

It is usual that display panel interfaces include other signals that are not part of the LTDC

signals described in Table 5. These additional signals are required for a display module to

be fully functional. The LTDC controller is able to drive only signals described in Table 5.

The signals that are not part of the LTDC may be managed using GPIOs and other

peripherals and may need specific circuits.

The display panels usually embed a backlight unit which requires an additional backlight

control circuit and a GPIO.

Some display panels need a reset signal and also a serial interface such as I2C or SPI.

These interfaces are used in general for the display initialization commands or for the touch

panel control.

Figure 12 shows a display panel connected to an STM32 MCU using the LTDC interface

signals illustrated in Table 5.

Table 5. LTDC interface output signals .

LCD-TFT signal Description

LCD_CLK

The LCD_CLK acts as the data valid signal for the LCD-TFT. The data is

considered by the display only on the LCD_CLK rising or falling edge.

LCD_HSYNC

The line synchronization signal (LCD_HSYNC) manages horizontal line scanning

and acts as line display strobe.

LCD_VSYNC

The frame synchronization signal (LCD_VSYNC) manages vertical scanning and

acts as a frame update strobe.

LCD_DE

The DE signal, indicates to the LCD-TFT that the data in the RGB bus is valid and

must be latched to be drawn.

Pixel RGB data

The LTDC interface can be configured to output more than one color depth. It can

use up to 24 data lines (RGB888) as display interface bus.

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