Have you ever encountered such embarrassment in the mall? The shopping guide was introducing the product with a touch screen. The screen suddenly turned black and a group of people surrounded the machine to look for the switch, but they couldn't respond when they touched the border. What's even more outrageous is that the switches of some equipment are actually hidden in places that they never imagined. Last time I went to the 4S store for maintenance, the repairman searched for half an hour before he found that the switch was under the sticker on the back of the screen!

1. Anti-human design switch hiding technique

You may not believe it if you say it. Last year, there were 17 switches installed in different positions in the search screen of a government affairs hall in 20 service windows. The three most common designs:

1. ​​Border camouflage​: The switch is made of the same bulge as the touch point, and a supermarket self-service checkout machine has a 38% error touch rate.
2. ​Sticker Trap​: Use product labels to cover the physical switch. On the day of opening of a certain brand's experience store, 5 devices were exposed to the label being torn by customers.
3. ​​Soft and hard combination​: Press a virtual button for 5 seconds to wake up the switch menu. This design has caused the help rate of users over 65 years old to soar.

I'll teach you a trick: next time I can't find the switch,​Touch three times counterclockwise along the screen border​​. Don't laugh! This is an industry unspoken rule revealed by an engineer friend - 87% of equipment puts the switch within 10cm in the lower right corner, but will be treated with anti-incorrect touch.

2. Switching secrets of special equipment

Don't think that all touch screens are as easy to serve as mobile phones. Two special models can make you doubt your life:
​1. Explosion-proof touch screen​: The type used in the chemical workshop must be hidden behind 1cm thick tempered glass, and must be opened with a special magnetic key. A chemical factory once had a accident caused by workers prying the switch, causing the seal to fail.
​2. Outdoor advertising screen​: For IP65 protection equipment, the switch must be turned on with a hex wrench. A scenic spot administrator used a vise to pry it hard, and the rainwater penetrated into the motherboard, which made the repair fee sufficient to buy three new machines.

Here is a comparison table:

3. The manufacturer will not tell you the secret to finding the switch

Lao Wang, who has been installing equipment for eight years, told me that mastering these three tricks can avoid detours for ten years:

1. ​Oblique light observation method​: Use a 45° angle of the mobile phone flashlight to illuminate the frame, and the switch seams will appear shadows
2. ​Temperature detection method​: After 10 minutes of turning on the computer, use an infrared thermometer to scan. The temperature around the switch is usually 3-5℃ higher than that of the screen.
3. ​​Vibrating listening method​: Tap each part of the border, and the position with a slight echo of the cavity may be the switch box

There is a classic case: a library's search screen fails collectively, and finally it is found that the cleaning lady accidentally touched the hidden switch while wiping the screen. Now all new devices are usedPressure sensing switch——You have to press a specific area with a force of more than 3kg to trigger it. This design reduces the error touch rate by 79%.

The most outrageous design I have ever seen is to make the switch into a certain pixel point on the screen, which must be found with a microscope. I suggest that all novices remember: Don’t force yourself to break when you can’t find the switch. First check the 17th page of the instruction manual (don’t ask why it is this page, the industry’s unspoken rules). The latest research shows that the switch design compliance rate of equipment that has passed ISO three system certification is 63% higher than that of ordinary products, and can automatically send positioning signals to maintenance personnel in case of sudden failures. Next time you encounter a black screen, you might as well try saying wake-up words to the screen - some high-end devices really support voice-control booting!

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