Segment screen fault diagnosis solution

chenzhouyu

Segment screen fault diagnosis solution [Copy link]

 

Hello everyone, can the segment code screen be used for fault diagnosis? For example, after a product has been sold for a period of time, some segments of the segment code screen do not display, or display abnormally, and fault diagnosis is required, and early warning information is issued to the user.
Thank you!

tagetage

This does not require diagnosis. The simplest way is to improve the product quality of the screen. If the quality of the LED is good, it will not break down for decades.

chenzhouyu

tagetage posted on 2023-10-10 09:37 This does not require diagnosis. The easiest way is to improve the quality of the screen. If the quality of the LED is good, it will not break down for decades.

The customer requires functional safety ASIL B level and requires diagnosis.

tagetage

Oh, so, then you need to find an LED driver chip that meets the ASIL B safety integrity standard. I just found one for you. MBI6353Q

Supports error detection-LED open circuit error detection-LED short circuit and other functions.

https://www.mblock.com.cn/cn/Driver_ICs/LED_Driver_ICs/detail/131

chenzhouyu

tagetage posted on 2023-10-10 10:46 Oh, so that's it, then you have to find an LED driver chip that meets the safety integrity ASIL B standard. I just found one for you. MBI6353Q ...

I asked two manufacturers of LCD driver chips for automotive code screens and they said they do not have diagnostic functions.

tagetage

chenzhouyu posted on 2023-10-10 11:03 I asked two car code screen LCD driver chip manufacturers and they said they do not have diagnostic functions.

Are you asking about the chip I mentioned???

极限零

There is an automatic fault detection for LCD chips, right? If you do it all yourself, you can make your own detection module. If you buy a ready-made one, you really don't know.

tagetage

I'll give you one more. A lot of options. With error detection.

http://www.silicon-touch.com/product/product6.html

fxyc87

LCD can't detect it, right? They are all high-impedance driven, the current itself is very small, there is no difference between bad and good current, right? Unless there is an external visual judgment?

chenzhouyu

tagetage posted on 2023-10-10 12:18 Are you asking about the chip I mentioned? ? ?

Silicon Creation

Verifone

There is really no way to detect this. We use visual inspection to check whether it is good or bad. When it arrives at the front line, if it is broken, there is nothing we can do but replace it with a new one.

lkh747566933

I have never designed a segment code screen, but I guess it is similar to the principle of LED dot matrix.

dyjccx

tagetage posted on 2023-10-10 09:37 This does not require diagnosis. The easiest way is to improve the quality of the screen. If the quality of the LED is good, it will not break down for decades.

correct answer!

tagetage

fxyc87 posted on 2023-10-10 13:35 LCD can't be detected, right? They are all high-impedance driven, and the current itself is very small. There is no difference between the bad and good currents, right? Unless there is an external visual judgment?

It's LED, not LCD.