diff --git a/src/screen.cpp b/src/screen.cpp
index 3201d73..b19ce6d 100644
--- a/src/screen.cpp
+++ b/src/screen.cpp
@@ -111,7 +111,7 @@ void Screen_::setPixelAtIndex(uint8_t index, uint8_t value, uint8_t brightness)
 {
   if (index >= 0 && index < COLS * ROWS)
   {
-    this->renderBuffer_[index] = value * brightness;
+    this->renderBuffer_[index] = value <= 0 || brightness <= 0 ? 0 : (brightness > 255 ? 255 : brightness);
   }
 }
 
@@ -119,7 +119,7 @@ void Screen_::setPixel(uint8_t x, uint8_t y, uint8_t value, uint8_t brightness)
 {
   if (x >= 0 && y >= 0 && x < 16 && y < 16)
   {
-    this->renderBuffer_[y * 16 + x] = value * brightness;
+    this->renderBuffer_[y * 16 + x] = value <= 0 || brightness <= 0 ? 0 : (brightness > 255 ? 255 : brightness);
   }
 }