Why does a hardware wallet need a screen? The core issue boils down to two words: blind signing. What is blind signing? It’s when you sign something, but you have no idea what’s actually written in the contract. The screen on a hardware wallet is your only 100% trustworthy 'truth display' in the digital world. Why? Your computer could be compromised by malware at any time. The computer might show 'Send 1 ETH to Alice,' but the command sent to the wallet in the background could actually be 'Send 100 ETH to Hacker.' With a wallet that has no screen, when you press the confirm button, you’re confirming something you *can’t see*. So why can’t the screen be too small? A small screen can’t fully display the content of a smart contract. It can only show a string of hash values: 0x3a...9f. You have no idea if this string of gibberish means 'Approve USDT' or 'Empty your wallet.' What can a large screen do? It translates code into plain language: Action: Approve Token: USDT Amount: Unlimited Spender: 0xHacker... You can spot the problem at a glance. There’s also a human factor: scrolling fatigue. A small screen requires you to press dozens of times just to read an address. 99% of people will get impatient and just hit confirm. Is the screen on your hardware wallet big enough?