1 files changed, 8 insertions, 0 deletions
diff --git a/src/drivers/St7789.cpp b/src/drivers/St7789.cpp
index fd1366f..3ed1beb 100644
--- a/src/drivers/St7789.cpp
+++ b/src/drivers/St7789.cpp
@@ -23,6 +23,7 @@ void St7789::Init() {
   RowAddressSet();
   DisplayInversionOn();
   NormalModeOn();
+  SetVdv();
   DisplayOn();
 }
 
@@ -114,6 +115,13 @@ void St7789::WriteToRam() {
   WriteCommand(static_cast<uint8_t>(Commands::WriteToRam));
 }
 
+void St7789::SetVdv() {
+  // By default there is a large step from pixel brightness zero to one.
+  // After experimenting with VCOMS, VRH and VDV, this was found to produce good results.
+  WriteCommand(static_cast<uint8_t>(Commands::VdvSet));
+  WriteData(0x10);
+}
+
 void St7789::DisplayOff() {
   WriteCommand(static_cast<uint8_t>(Commands::DisplayOff));
   nrf_delay_ms(500);