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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Load switch for sequenced application of voltage

This is a follow-up to my previous question. Now, in order to properly power up an LCD, the datasheet states to apply VGL first, then VGH and AVDD. I want to do this with the circuitry below. AVDD: 8 ...
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Wiring EDP LCD to MangoPi DSI port [closed]

I have a spare Wacom su8e-12h02au-01x and a mango pi pro pink with Allwinner D1. The LCD has a 30 pin connector: presumably EDP (couldn't find docs, info might be wrong), the mango pi has an HDMI and ...
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LCD power down sequence

I am trying to build my own gaming handheld. I chose a parallel RGB LCD (Samsung LTP500GV-F01). Using a boost converter by TI (TPS61085) I was able to generate all necessary voltages. (I know there's ...
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How do I control the brightness of a TFT LCD through SPI (No Backlight Pin)

I recently purchased a TFT LCD (GMT020-02 VER1.1) The screen uses the ST7789V LED Driver and does not include a backlight control pin, So Originally I though that it was impossible to control it (i.e ...
Trippy 741's user avatar
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Strange artefacts on LCD display being driven by FPGA

I'm trying to use a Tang Nano 9K FPGA to generate a good signal for a 4.3 inch LCD display with a 40-pin connector. If I display a checkerboard image like this then all is well. This code generates ...
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Powering options for Arduino project

For my project, I have these components: Arduino Mega 2560 Rev 3 HC-05 Bluetooth module LCD display Logic Level Shifter Currently I am powering the Arduino Mega using the Vin and GND pins via 6 AA ...
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How do I identify an unknown LCD controller?

Edit: I wrote a mail to Sitronix asking for docs for this controller, and they said it is ST7522, with public avalible docs. I'm currently trying to reverse engineer a device with an MCU, LCD, and an ...
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RC delay timer to power LCD

I'm looking turn on the power of an LCD screen from a Pi Pico with a short time delay (50-100ms) after the Pico is plugged in. I want to power the screen with VCC from the Pico (5V) and use a signal ...
printsmith3d's user avatar
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How do I best connect my LCD panel? [closed]

I have started an electronics project as a hobby that requires an TFT-LCD panel to be directly controlled by a Raspberry Pi / Orange Pi. More information: I would prefer not having a control board, ...
Lolmerkat's user avatar
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Puzzling 'conductor' in a bathroom scale [duplicate]

Hoping to scavenge the LCD from an old bathroom scale for another project, I took it apart. There were four sensors -- one in each 'foot' of the scale -- all wired to a small circuit board whose back ...
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What might cause light vertical banding on LCD?

I'm troubleshooting a PCB which uses a STM32 to drive a large LCD. I have 2 versions. The new version has light green vertical banding on the display. The old one does not. I'm using the same display ...
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PWM Low-pass filter for LCD contrast pin with a potentiometer?

As a software developer, electronic engineering isn't my strong suit, so I'm struggling to understand some simple concepts regarding this circuit. This is a unique circuit I have encountered that is ...
David Refoua's user avatar
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What might cause this strange pattern on an LCD monitor?

Recently my laptop has been showing a strange effect on its monitor: This is supposed to be a black screen, but the bottom fifth or so is affected by some kind of interference pattern. The pattern is ...
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Why does this LCD Bias Driver Have a Fault Mode?

I have a product that uses a TPS65150 LCD bias driver. I recently had an issue with a batch of boards, where this driver would go into fault mode (low on FDLY pin). The fault mode is triggered on a ...
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How many steps of crystals rotation typical LCD display has for each pixel?

I just got a comprehensive response for brightness + contrast for LCD TVs in Brightness / contrast controls: what they do on LCD displays?. And realized that when RGB data is transmitted to LCD ...
Martian2020's user avatar
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Brightness / contrast controls: what do they do on LCD displays?

I was not able to find an answer via web search. AFAIK LCD displays can control brightness via changing brightness of backlight, in turn via electric current value (up/down). I don't recall reading ...
Martian2020's user avatar
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How does a boogie board/LCD writing tablet/ChLCD reset actually work?

there are those boogie boards, which essentially are just special LCD screens: ChLCD screens. which work by reflecting light on the places where it is activated. in a boogie board, the pressure causes ...
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DC Offset in LCD clock signal

I am getting DC offset in clock signal. Clock signal has 24MHz frequency. The DC offset is around 400mV. Also I was expecting Square shape waveform but I am getting sinusoidal with DC offset. Clock is ...
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Driving 1602 LCD in noisy environment

My PCB drives a 1602 LCD in 4-bit mode over a 0.5-1m long AWG28 (0.08mm2) ribbon cable. Sometimes I get nibble sync problems. It can be seen on the LCD as strange or garbage characters. This does not ...
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Internally connecting pins on microcontroller

I am working on generating passive LCD waveforms myself using a microcontroller, and am noticing that proper LCD driver hardware has only one set of resistor dividers for generating bias voltages and ...
Nolan Hergert's user avatar
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Achieving faster data transfer from a microcontroller to a display

The current fastest way of transferring data from a microcontroller to a display that I know of is by constructing the data in RAM and then sending it over to the display via parallel communication ...
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What Interface is my LCD display using?

My Tektronix TDS 2024's 5.7” STN display (320x200, color) needs replacing. Instead using the same expensive, hard-to-find, obsolete one, it would be a good opportunity to upgrade to a more modern ...
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How is it possible to change RGB color filter panel to BGR color filter panel if the color filter is physically firmly mounted on the LCD display?

How is it possible to change RGB color filter panel to BGR color filter panel if the color filter is physically firmly mounted on the LCD display? TFT display design. Are RGB colors created only by ...
stm's user avatar
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How do two LCD segments get shorted together internally? What can cause that and is there any way to fix it once it happens?

I have a custom segmented LCD I took out of an old device that I'm now driving with an Arduino connected to LCD Driver AY0438. These are old custom displays so I don't have a datasheet or anything, I ...
SherEEf's user avatar
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Is it possible to re-use a 7 inches TFT Display on Raspberry-Pi? [duplicate]

I'm trying to re-use a display I recovered from an old digital photo frame as a display for a Raspberry Pi. The display is a TFT 7" LCD with backlight, but it comes with a 26-pin flat cable for ...
Grohlfer's user avatar
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2 answers
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Help identifying this LCD [closed]

I disassembled a broken kitchen scale and I found this LCD module: https://imgur.com/a/8Uc3AHR The module has only 2 wires (A(node) and K(athode) printed on the board). I was wondering what kind of ...
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Have I configured the correct current supply for my TFT LCD Backlight?

I am currently working on a custom PCB which integrates a 3.5" TFT LCD. I am planning on driving the TFT backlight using a MIC4801 LED Driver and want to make sure I have configured the correct ...
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How is the LCD on STM32H735G-DK connected, and how can I turn it off?

The STM32H735G-DK Discovery board comes with an LCD. I wrote from scratch (no HAL) a simple blinky code, and it works well. However, the LCD is on (and backlit) by default, without any code from me ...
SRobertJames's user avatar
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LCD Display with FPC to Arduino

I’m very new. My game is push button, but it’s important that the display is transparent. I have this LCD screen. (data sheet) I was going to connect it to my uno using this PCB. But it didn’t fit ...
Supernew's user avatar
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What are LCD subpixels made of?

Just curious. I don't really need to know this level of granular detail for my job (AV technician) but in courses/articles about color LCD displays they explain everything... except what the red, ...
itsagift's user avatar
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What type of LCD display is this?

I have an old alarm clock where the LCD broke down (powered by 2xAA batteries) The LCD is transparent, and can only show 4 7-segment characters, plus some indications such as dividing ':', alarm on ...
Arvest's user avatar
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How to connect a mini camera to four 3.5-5 inch TFT/LCD screens? [closed]

I have an ambitious project, given my limited circuitry knowledge. To simplify my project's potential, I want: One mini camera Four TFT/LCD displays (anywhere between 3.5 and 5 inches) As long as the ...
BeemerGuy's user avatar
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Fixing an 0.5 mm pitch, 18-pin FPC tear

I accidentally tore my Lego EV3's LCD FPC (Flexible Printed Circuit) while opening it. The FPC is a 1.0mm 18-pin-pitch FPC which near the end is converted to a 0.5mm one. I found this post in the ...
pythoncat's user avatar
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Tablet LCD display to hdmi

I have an old tablet and an old phone and I have recovered the lcd displays from both of them. I want to use them as monitors with an hdmi or vga port, but seeing the cables of the two i do not know ...
Alessandro Valentino's user avatar
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Best way to work out how to use this LCD screen without datasheet

I found this LCD screen in an electrical waste bin, however after googling the board number and the controller on it I haven't been able to find any results. I can't for the life of me work out whats ...
Bren's user avatar
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Are there crosses or alternatives for the IP5311CX5_LF LCD display chip for Nokia 6120c Classic (year 2008 model)?

I was looking for the LCD display chip for my Nokia 6120c Classic (model year 2008). The name of this chip as shown in this schematic diagram of Nokia 6120c Classic (model year 2008) is IP5311CX5_LF ...
Lightning Throws's user avatar
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4 answers
101 views

16×2 LCD built-in specifications

Do we need to manually force cursor to move rightwards in 16×2 LCD to display a string? How is it done with intel 8051?
Philip's user avatar
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Interfacing Issue between PIC18F46K22 and I2C LCD with PCF8574AT module

I'm facing a problem while interfacing a PIC18F46K22 microcontroller with an LCD screen using I2C communication. I have used a PCF8574AT I2C module and a 16x2 LCD screen. Everything works correctly in ...
Nader Noomen's user avatar
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1 answer
93 views

Can I run my 3.5" TFT backlight off of a 3.3V supply?

I just wanted to confirm my thoughts on the selection of resistor value for a 3.5" TFT screen I am working with. The datasheet gives a forward voltage of 3.2 V and a forward current of 120 mA. ...
henryv3's user avatar
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Transistor choice for PWM controlled LCD backlight

I have a problem with choosing most appropriate transistor to control backlight of my LCD display. According to datasheet its \$I_f = 60mA\$, and \$V_f = 3.2V\$. My circuitry is all 3.3V based. I ...
Andrzej Komor's user avatar
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Spec sheet diagram re: NEC u7225PD LCD Driver (14 segments)

This question is in regards to figure 6 of the uPD7225 Programmable LCD Controller/Driver data sheet. My use case is typical: a 14 segment driver clocked at 147k in divide-by-four mode. From the ...
Quinn Carver's user avatar
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What driver can I use to convert a 24 bit Parallel RGB signal into SPI or MCU?

I want to convert a 24 bit RGB signal into a SPI or MCU interface to drive a small LCD. I have a circuit that I have created that has dedicated video memory and is connected to a small circuit that ...
Pseudonymous Garbage's user avatar
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Cyclone III FPGA 16x2 LCD repeat one character instead of displaying complete word

So I am trying to use the LCD on the cyclone III FPGA. I have written this verilog code that should display numbers 0 to 9 then letters A to G Compiling the code has no errors at all However, when ...
Mahmoud Khodier's user avatar
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Where do I add the motor leads?

I'm making a small type light house and wanted to know where I add the positive and negative leads from the motor onto this circuit board? I'm just a DIY-er and know hardly anything about circuit ...
Danny Huebner jr.'s user avatar
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Interfacing FMC with LCD DBI TYPE B - Intel 8080

I recently trying to develop on LCD screens, and I saw the TFT LCD interfacing with the high-density STM32F10xxx FSMC (AN2790 Application note) and I was going along the way with the Application note ...
xmeety's user avatar
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STM32F769I-DISCO - Really noisy TFT LCD display

I am a new user of an STM32F769I-DISCO MCU and the problem I'm having is with one of the examples called "BSP". I'm using the STM32CubeIDE to build and run the files. The program does build ...
lucky38's user avatar
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My LCD connected to ATmega16 is not displaying anything

My 16 x 2 LCD is connected in 4 bit mode on the lower nibble to an ATMEGA16. Here are the connections: VSS - GND VDD - VCC V0 - POTENTIOMETER RS - PC6 RW - PC5 E - PC4 D4 - PC0 D5 - PC1 D6 - PC2 D7 - ...
Saeed Bowman's user avatar
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STM32H7 LTDC LCD MIPI DBI

I am using STM32H723ZG with LCD controller ILI9488 working with MIPI DBI type B interface (16 data lines). Interface pins on the LCD controller are: CS(Chip Select), DC(Data/Command), RD(Read signal), ...
xmeety's user avatar
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LCD screen panel stuck in BIST mode

I have a BOE DV430FHM-NN0 LCD screen panel with an LVDS 30-pin receptacle cable. It was happily working with a M.NT68676 board, but one day when I connected it to the same board, the panel suddenly ...
Henry Kwon's user avatar
2 votes
1 answer
124 views

I have 2 LCD panels - I'm trying to find out what electronics I need to set them up

I have two LCD panels that I want to use, but they don't have any electronics, case or anything with them (I got them from a computer shop that was shutting down). I need to figure out what PCB they ...
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