Questions tagged [lcd]

Short for Liquid Crystal Display. LCDs consume little power, and exist in graphic LCDs, or segmented. The latter type is used for character and 7-segment digit display, and also in custom LCDs for consumer electronics.

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61 views

What could cause a sub-pixel defect that is only visible under certain conditions? [closed]

An interesting but annoying pixel fault has appeared on the display of my laptop. At first glance it looked like a Stuck Pixel defect (one or two red, one blue and one green sub-pixel) but then I ...
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Problem with IC chips, Eprom and LCD Screen

I'm attempting to translate binary numbers into digital numbers on an LCD screen. However, I'm not using a microcontroller, but trying to do it with some IC chips and an EPROM. The first chip is a ...
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How to power up an LCD Controller Board with a power bank

I am new to electronics so need help. Recently, I salvaged the screen of a broken VivoBook E402NA laptop, and bought this controller to turn it into an external monitor. Now, evidently this controller ...
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57 views

Multiplexing 8-digit segment LCD

After a lot of hustle and online search, I understood that an LCD segment cannot be driven like the LED ones and that I need a special driver. The problem is I cannot find a driver that I can ...
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How can I display voltage?

I want to display voltage ranging from 0-24V on an LCD. We can use an analog to digital converter but the range I need is much bigger to compare with. How do I connect it without any microcontroller?
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How to turn off and turn on LCD 16*2 display?

I build a device in which I check data on LCD display 1 or 2 times a day. So when I tried to turn off my 16*2 display and re-plugin in the middle of running the machine it gives some garbage value. ...
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32 views

STM32H743 FMC with ST7789 doesn't work without delay

I have an STM32H743 connected to a screen that uses ST7789 via FMC (i.e. parallel connection) using 8-bit bandwidth and A18 to select between command and data. The current code has an issue that the ...
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41 views

2.4" LCD TFT backlight current limit resistor

I have some doubts regarding 2.4 LCD TFT ( NHD-2.4-240320CF-CSXN ) backlight current limit resistor value. Datasheet note is not clear 6. Backlight: White LED / 3.1V / 100 mA ( Typ ) 3.1V means: a) ...
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What low cost LCD can I use in minus -30°C? [closed]

I'm looking for an low cost LCD I can use that can still operate even if they it's exposed by -30°C. Normally, the 1602 LCDs have a minimum operation limit at 0°C. So I cannot use that ... or can I?
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Is there any need of EMC/EMI shielding of LCD used for Aviation pruposes?

We have a TFEL technology display which uses Indium tin oxide (ITO) Coating for EMC/EMI shielding. Now we want to replace it with newer LCD TFT display. the question is would ITO coating is needed for ...
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39 views

Circuit power issues causing LCD to change brightness when motor operates

My apologies I'm still getting to grips with the more advanced aspects of electronics, so apologies if this is a stupid question! I'm building a sensor device with a Raspberry Pi, and have got ...
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Must an LCD panel meet specific requirements to support a higher refresh rate?

Newer LCDs can refresh the screen at 120Hz or higher. The driver circuitry for the panel is responsible for pushing frames to the panel at a given rate, but are there any particulars of the LCD panel ...
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Do I need to connect anything to LCD VGL and VGH pins?

I'm trying to drive a ER-TFT070-6 LCD using the built in controller in the STM32H7A3ZIT6. I'm in the process of hooking up the signals between the MCU and LCD, and I'm not sure what to do with the VGH ...
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50 views

LCD clears itself when potentiometer contrast is too low

I'm making a project that requires an LCD, and the project was working fine on my breadboard for testing. I moved it to my final product, but now my LCD stops displaying text after a few minutes, or ...
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Why does the LCD impede the ESP8266 NodeMCU initialization?

I have a very simple setup on a breadboard that connects a Lolin v3 NodeMCU ESP8266 with a 16x02 LCD. No I2C communication, I'm doing with directly with Arduino IDE and the LiquidCrystal ...
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34 views

How to identify an unknown LCD pins from scrap, and use it for Arduino

I've got an unknown LCD from scrap, I don't know what each pin is. can anyone help me with this? it has 19 pins that 16 are functional. also when I touch each pin with hot solder some signs turn on.
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I have trouble identifying this display. I don't want to damage it since it's perfect for a project I have in mind [closed]

This is the picture of the display. It's from a toy laptop with counting games for children. On a closer look it might be a toy that is mass produced for the eastern market. Any information is ...
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Power consumption LCD display on digital watch 12h/24h

just a fun question: When I was a child, I thought that displaying my casio F91w in 12h mode rather than 24h will make my battery last longer since there are fewer segments displayed. when i saw this ...
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Applying voltages to conductors in a passive-matrix LCD

In the picture the horizontal and vertical lines are the conductors and the intersections are the pixel positions I want to turn off the pixels which I've filled So for that I've to apply an electric ...
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1answer
60 views

Why refresh rate is needed in a passive-matrix LCD

In a passive-matrix LCD we have horizontal and vertical conductors. The intersection points are pixels which are cells of liquid crystal molecules. For drawing a frame, we provide the necessary ...
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47 views

Change LCD information from PIC using push buttons [closed]

I can connect my PIC18F4620 to an LCD and I can display my sensor information with no problems. Now I came into an issue, I have 3 sensors - 2 digital and 1 analog - I can perform the readings, but I ...
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What's the best way to dim a 5-inch LCD for a Raspberry Pi?

I'm trying to make a DPI display to work with my Raspberry Pi. First, I searched around and found out that the 555 timer IC is a good way to control the brightness of the display. Since the background ...
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How can I identify a salvaged LCD? 21 pins [closed]

I did something that might be considered bad practice. I desoldered an LCD from a fan heater by silvercrest and i'm having some trouble identifying the pinout of it. From what I can tell, pin 1 is GND ...
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Can I use a 640x200 STN LCD controller to drive a 640x240 STN LCD display?

I have an old LCD display controller that drives a 640x200 STN LCD display. The interface has a Frame Pulse/Frame Line Marker (FP/FLM), Line Pulse (LP), and LCD Clock control lines and D0..3 data ...
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Can I/O expanders be used to drive a Camera or LCD?

After searching around it seems that I/O expanders are used mostly to drive LEDs or buttons. Could something more complicated like an LCD be driven without bit banging? I.e. are there typically ...
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Programming an LCD interface with a ST7066U

I am trying to program an interface between my 2x16 LCD and my MSP430FR6989. The LCD communicates parallelly with the MPU (E RS EW D7 -- D0), and it uses an ST7066U controller IC. from reading the ...
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What does JB instruction mean in Assembly

I am looking at an ST7066U controller for a 2x16 LCD, and in their datasheet, they have these Assembly instructions that I would like to change to C code. ...
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1answer
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LCD Delamination and Lamination Process

I have an iMac display (thin LCD) that has the glass broken yet the LCD is fully functional and another iMac display with LCD broken but glass undamaged. I am wondering if there is any recommended ...
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I2C communication with LCD2041 using PIC32MM

I am trying to communicate with LCD2041 using pic32MM using I2C I wrote the following code on MPLAB code configurator but so far the status for the I2c communication seems to get stuck on pending . I ...
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Only green display but temperature it's not showed there

I'm trying to build a graphic display thermometer in Proteus, with an LM35 sensor using the ATmega 164 microcontroller. My problem is that the program that I've built it's only starting the display(it ...
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1answer
39 views

How to compare OLED and LCD brightness

I am trying to build a night clock projector, inspired by this project: https://microengineer.eu/2018/05/01/diy-night-clock-projector/ As I am more a computer scientist than an electrical engineer, I ...
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Best way to create an Adapter to connect an eDP LCD panel to Mac/PC USB-C or DisplayPort?

I look for guidance on how I can best reuse a Panasonic VVX14P048M00 LCD panel (3000x2000, 13.5", 4-lane eDP v1.3) as a secondary screen via USB-C Video Function or DisplayPort. Besides adding ...
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Long term stability of 1602 LCD contrast calibration?

When setting the contrast on a 1602 or similar LCD module such as this one does the contrast remain relatively constant over the lifetime of the display or would it require periodic recalibration as ...
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Verilog design to display character using “16x2 Character Display” IP from Quartus IP Library

I was trying to display a single character on 16x2 display. I created simple Verilog design for "Altera Cyclone V Development Kit". In the project I used "16x2 Character Display" ...
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Saving one measurement one display and recalling it using Arduino

I am using an Arduino with 49E Hall sensors and a 16x2 LCD display and buttons. If I push the button, I want to display the current measurement of the hall sensor (one number). And if I push the ...
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How to adjust the brightness of a small LCD(21V) with a potentiometer?

I want to adjust the brightness of a small LCD with a potentiometer. How can I use a 555 timer to make a PWM which can give out an output of 21V from a 5V input?
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83 views

16 Segment LED, 4 Digit, Common Anode (4 sets)

I'm trying to make an F/A-18C UFC like this: Now a while ago I bought 6 x "4 digit 16 segment" LED, which happen to be common anode (DataSheet) What i am looking for is a way to drive all 4 ...
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Pass bandwidth of backing light for LCD display

A stardard industry LCD display is composed of several parts. Polarizer film and color filters produce and image by masking the light from a source positioned behind the LCD itself, the so called ...
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Reverse engineering LCD module pinout and finding a replacement

I trying to reverse engineer an LCD module with no useful markings (datasheets etc). It is for sure a 128 X 64 LCD matrix of some sort, as I counted the dots in a closeup picture of a working one. ...
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LCD Viewing angle for 8 COM vs 4 COM

I'm planning to make a custom LCD made. The LCD has 128 segments. Now, in order to drive it, I have two options : Use 4 COM + 32 pins Use 8 COM + 16 pins The MCU which I'm looking at (STM8L052R8) ...
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456 views

How to interface MIPI DSI with a microcontroller

I'd like to learn about interfacing a TFT LCD with a microcontroller via the MIPI DSI protocol and writing a program for it. Both have suitable number of pins, some microcontrollers support MIPI DSI ...
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stm mcu with built in lcd controller

I am planning to buy an LCD display which has been customised as per my needs and it will comprise of 128 segment. I was planning to buy a stm MCU which will contain an LCD driver inside it while ...
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57 views

What is the typical voltage for driving LCD fluorescent backlight tubes?

I ran into this old cockpit/pilot room for heavy mining machinery in which there was an LCD display that's not lit properly, that is, the image was there but the backlight clearly was gone. Upon ...
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Custom HDMI-to-( TFT or LVDS ) decoder/driver

I am working on a custom-made handheld PCB based around a PI Compute Module 3+ and one of the hardest steps I have found is how to include an HDMI-to-50pin-TTL driver on my PCB to run an LCD TFT 7&...
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How are pin mapping done in LCD driver / microcontroller

I'm getting a custom LCD made, and it is a non COG version (to save on tooling costs), which means I'll need to use an external LCD controller. My LCD has 128 segments, so 32+4COM pins would suffice. ...
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Basic LCD drive question for Lumex

Sure this is a pretty basic question for you guys, but figured I'd start here. Is the linked LCD screen driven by some type of driver, or do you just supply logic voltage to whatever pin you want to ...
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LCD1602 not displaying any characters

I've connected an Arduino with a LCD1602. I've followed this exact tutorial: Link to the tutorial Whenever I see my LCD at a right angle (upfront) I can't see anything. But whenever I see my screen ...
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171 views

Are all pixels addressed simultaneously in one frame?

In computer screens, is every pixel turned on during one frame? How can you address millions of pixels at the same time? Or is it like in CRT where it is scanned left to right, top to bottom?
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LCD Power sequencing

According to datasheet of LCD TFT ( https://www.gms-ds.com/fileadmin/produkte/pdf/DLC0700BIG-1.pdf ) page 11 there is power sequence necessary for proper initialization of LCD. On the other hand at ...
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LED backlight hotspot

I have tested a new part number (as replacement) for an LED backlight for an LCD. The LED tested is SML-D15MWT86. We have followed a physical arrangement similar to the original pcb (2 parallel rows, ...

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