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What will happen if you call disp.clear() but forget to call disp.display() afterwards?

medium📝 Predict Output Q5 of 15
Raspberry Pi - Display and Output
What will happen if you call disp.clear() but forget to call disp.display() afterwards?
AThe program will crash with an error.
BThe display will not update and still show old content.
CThe display will clear immediately without disp.display().
DThe display will show random pixels.
Step-by-Step Solution
Solution:

  1. Step 1: Understand disp.clear() effect

    clear() resets the buffer but does not update the physical display.

  2. Step 2: Role of disp.display()

    disp.display() sends the buffer to the OLED to update what is shown.

  3. Final Answer:

    The display will not update and still show old content. -> Option B

  4. Quick Check:

    clear() alone = buffer cleared but display unchanged [OK]
Quick Trick: Always call disp.display() after buffer changes [OK]
Common Mistakes:
MISTAKES
  • Assuming clear() updates screen immediately
  • Forgetting to call display() after changes

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