NHD-2.4-240320CF-CSXN#-F Brightness Adjustment

JonHarrison

• November 01, 2017 08:07

I have been trying to adjust the brightness of this 2.4" TFT using the ST7789S controller commands without success.

As a test

    TFT_24_7789_Write_Command(0x0053); /* WRCTRLD Write CTRL display */
    TFT_24_7789_Write_Data(0x24);      /* BCTRL = 1 = brightness register active
                                          DD    = 0 = display dimming is off
                                          BL    = 1 = backlight control is on
                                       */
    for (uint16_t i = 0 ; i < 255 
    {
        TFT_24_7789_Write_Command(0x0051);
        TFT_24_7789_Write_Data(i);
        TFT_delay(1000);
        i += 32;
    }

but there is no change in backlight level. Does anyone have any suggestions about what I'm doing wrong ?

0

• 

  Saurabh_B

  • November 01, 2017 10:07

  Hello,
  
  For our LCDs you are directly connected to the LEDs, the power is not controlled by the ST7789s.
  
  I would recommend using an external current limiting circuit into the anode for the display.

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