STM32F479 datasheet(25/91 Pages) STMICROELECTRONICS

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DocID029237 Rev 2

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AN4861

LCD-TFT (LTDC) display controller description

Figure 15. LTDC fully programmable display resolution with

total width up to 4096 pixels and total height up to 2048 lines

1. Only the active display area is shown in this figure.

3.3

Two programmable LTDC layers

The LTDC features two layers, and each layer can be enabled, disabled and configured

separately. The order of the layer display is fixed, so it is always bottom-up. If two layers are

enabled, the Layer2 is the top displayed window.

The LTDC features configurable blending factors. Blending is always active using an alpha

value. The blending order is fixed and it is always bottom-up. If two layers are enabled, first

the Layer1 is blended with the background color, and then the Layer2 is blended with the

result of the blended color of Layer1 and the background.

The background color is programmable through the LTDC_BCCR register. A constant

background color can be programmed in the RGB888 format where the BCRED[7:0] field is

used for the red value, the BCGREEN[7:0] is used for the green value and the

BCBLUE[7:0] is used for the blue value.

Figure 16 illustrates the blending of two layers with a background.

STM32F479 Datasheet(PDF) 25 Page - STMicroelectronics