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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What is the technical term for a transparent monitor which is visible on only 1 side? [closed]

What is the technical term for a transparent monitor which is visible on only 1 side? For example, if you had an OLED monitor where you can only see the screen from one side A bit like what would be ...
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Can I delay a screen repair after it’s been opened?

I’ve begun replacing an IPad Air Gen 1 screen, have done it many times before however this time I realised I was out of Kapton tape (so that I can hold the home button connector in place) and so now I ...
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How can I tell an HD44780S from an HD44780U LCD chip without markings?

I have a basket of LCDs collected over the years. I'm trying to build some circuits now but want to restrict my power supply to 3.3 volts meaning an HD44780U chip for the LCD and avoid having to ...
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A simulator for an ARM Cortex based microcontroller, an LCD, and a 4x4 keypad [closed]

I am looking for a simulator for the TM4C123GH6PM microcontroller which is based on the ARM Cortex. I am working with Keil but Keil doesn't support LCD or keypad. Is there any simulator that supports ...
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How to drive 1 x 168 LCD using 4 x 32 LCD driver?

I have to drive an LCD that has only single COM and 166 segments: Somehow using 4 x 32 LCD driver: So I am going to use five such LCD drivers (32+32+32+32+32+32) ...
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Can i use a 19V 4A adapter for my 12V 4A control board? [duplicate]

I recently bought a control board for my lcd panel that needs 12 V, 4 A however the power adapter I have is 19 V 4 A. Would it blow the control board/lcd panel if i was to use the power adapter?
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Adafruit LCD Going blank when using static gun

I'm having a problem with an Adafruit touch screen Module. When I use a spark gun (set to 20kV) on a grounded metal plate (placed a meter away from the DUT) after a few tries, the screen goes blank. ...
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16x2 LCD copper foil around the pin holes was accidentally removed

I tried to remove the I2C attached to the LCD. Is it okay if that copper foil around the 16x2 LCD pin holes got removed? I didn't do it intentionally, it just happened when I solder pumped the ...
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LCD scrambled by interference from RF plasma

My lab uses a custom-built setup to generate reactive plasma; basically metal plates in a vacuum desiccator energized by a BD-10A. I've built an arduino-based control box for it to allow more precise ...
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Decoding VGA Signals on a microcontroller design concerns

I have a microblometer sensor that outputs a VGA signal with resolution 640 * 480 pixels. Lets say I want 30 FPS.. I would like to know what would be the easiest way to convert that video signal into ...
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Interfacing LCD via SPI

Problem: I am trying to figure out how to interface an LCD via SPI. What is known: It is 80x32 dot matrix. There are 23 pins on a flex cable. The pinout. I'll put it below. The LCD is marked with red ...
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STM32 C library for ILI9341 TFT LCD with 16-bit data bus?

I'm using FSMC with ILI9341 LCD and I have some troubles with the LCD. The LCD comes in lot of different sorts, but this one do I have. I'm using this library but the problem is that I get only two ...
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why is this akward circuit for sharing LCD data lines with a matrix keyboard lines working?

I'm building a project with an arduino nano, since I don't have enough pins for all the devices that I'm going to attach to it I am trying to share some digital pins between a LCD screen and a matrix ...
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How can I drive an LP101WX2 LCD panel with the Chalkboard Electronics HDMI-dualLDVDS converter?

I am trying to drive an LP101WX2 panel with the Chalkboard Electronics HDMI-dualLDVDS converter but all I am getting is a black screen. I tried to flash the board's firmware with both the demo and the ...
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ks0108 vs NT7108 lcd controller

I need to replace a LCD display that has built in a ks0108 controller. I have found a replacement that really fit all the specs (dimensions, resolution, maH, Voltage) but has a Neotec NT7108 Built in ...
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Why are FSTN graphic LCDs not made in resolutions higher than 320x240?

I am interested in designing and building a low-power Raspberry Pi-based palmtop computer to use a (FS)TN monochrome transflective LED-backlit LCD, like that in the HP 300LX or the Psion Series 5. ...
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Does anybody know where can I find the datasheet of this LCD?

Where can I find the datasheet of this LCD? All I know about this LCD is that it's probably 128*128 and some of the text I found on the LCD: 128128I1NA FP-4,...
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UV masking with an LCD

I am planning to make a machine that uses an LCD screen as a mask for etching PCBs. However, I am concerned about the type of LCD that I would need as well as the accuracy that I would get. My main ...
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How do I fray/twist small wire reliably for soldering?

I accidentally severed a lcd monitor cable, and am not sure how to fray/twist them together reliably in order to solder it back? It's difficult to see all the strands, and not miss any, ime. Also, ...
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ST7789 display: pins IM0, IM1, IM2, IM3 are not accesible

In a [ST7789 LCD](https://www.adafruit.com/product/3787, how do I set the IM[3:0] pins for select the MPU Interface Mode? The manual just shows the values of IM[3:0] for each interface but doesn't ...
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Should the metal frame on a Nokia 3310/5110 style LCD display be grounded? [closed]

I'm currently tinkering with a design which includes a Nokia 3310/5110 style LCD, and I've noticed that the prototyping boards don't seem to connect the metal frame to ground: There are pads, but ...
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LCD subpixel logic

I am just wondering how does it work in lcd subpixel. There is some data signal which pass trough tft transistor to subpixel which is like capacitor. But I do not understand why current flow when ...
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Contrast voltage for display from PWM with negative rail

I want to control the contrast of this display using a well-filtered PWM output. They recommend a potentiometer between Vdd and Vee (negative built-in rail): With my MCU I can generate a filtered PWM ...
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How do I test TFT LCD?

I decided to make my own display that I can connect it to Raspberry pi or Jetson nano. so I've recently bought TFT 480x480 LCD with ST7701S and RGB interface. I think I'm providing valid signal, but ...
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GC9A01 LCD display backlight pwm control

I am trying to design a simple smartwatch using ESP32 MCU. For the display I am using GC9A01 LCD screen like this one. I did get display to work by using prototype board, and now I am designing the ...
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OLED (or other) screens combined with e-ink

About ten years ago there was a startup called PixelQi that developed a combination between an LCD and an e-ink screen. When using such a screen in normal (low-light) conditions, you would not notice ...
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How can I use this LCD with Arduino?

I found my LCD somewhere from some remote control. And as I am a beginner, I would like to ask you guys how could I connect these LCD with my Arduino Uno so that I can display the numbers on this LCD.
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Is this LCD monitor matrix damage or is something else wrong? [closed]

The monitor has a vertical line and a part of its screen is not working properly. Can this be fixed by replacing the matrix or is it something else?
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How to print arabic character on a full graphic LCD [closed]

I am stuck on finding a way how to write into my full graphic LCD with Arabic characters or how to include the ASCII Arabic code. Should I simply declare a ...
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What does the LCD driver board do?

As you know, the LCDs for laptops, tablets, etc. come with a driver board attached to them. I know they drive the backlight whether it's CCFL or LED. But does this board do anything else as well? For ...
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Why do IPS/OLED need to be covered with glass when e-paper does not?

I wonder why the major criteria of comparison of IPS/OLED displays is how reflective they are, but e-paper seems just to "enjoy" direct incoming light without that side effect. I've tried ...
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Semi-opaque red coloring spots on LCD, potentially dead pixels

I've been researching how LCD screens work on a technical level. One thing I had a hard time finding any detailed information about is failure modes and how to identify the cause of failures. Are ...
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What are these letters (not X's) in the boolean inputs in this datasheet?

I'm trying to code the 4-bit initialization process this LCD (page 25) and I'm seeing two rows of bits, with the second containing letters I have not seen before (N, F, D, C, B, I/D, and S). What do I ...
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LCD connector identification

I have a little PCB which converts a 42 pin LCD connector from a laptop MB to 12 pins and 22 pins for the LCD. I need to replace the 42 pin connector. How do I identify it precisely, or identify what ...
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How do LCDs power a specific pixel?

I have a vague idea of how LCDs turn on and off, but I still don't understand how an individual pixel could be turned on and off without having like tiny wires behind each etched area (which can't be ...
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Need DC wiring help

I planned to use the SATA to 5 V cable to power the LCD control panel board, but there are two 5 V pins on the board so which one should I solder? Images of the board: Link to the LG monitor manual: ...
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Is it safe to fix a segment LCD on a panel with hot glue?

I'm talking about an LCD like what is shown in the picture below. Can hot glue applied to its borders damage the liquid crystal molecules or anything else inside it? I searched on the web and found ...
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Driving an LCD backlight using a PNP transistor

I'm trying to turn on/off the backlight of this LCD for the power saving when my ESP8266 goes to deep sleep. Because the ESP8266 has a maximum output current of 12mA and the LCD needs a current about ...
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How data is sent to a raw TFT?

I have used TFT drivers before but now I want to challenge myself by connecting an FPGA to a raw TFT without a driver. I am having hard time understanding the basics of the signals : how RGB pins are ...
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What's this LCD voltage generator chip labelled BD2X 833028?

This is, as far as I can tell, the circuit which generates the LCD contrast voltage for an AlphaSmart Dana, a 2000s-era laptop thing running PalmOS. AFAICT the 8-pin chip labelled BD2X 833028 (or ...
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Driving LCD backlight using boost converter (Feedback loop & Constant Current)

I've been researching LCD backlight circuits (for my STM32-based project), asked questions before, but there is another question I have about the matter. I have noticed that some boost converters (I ...
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LCD with PCF8574 I2C driver doesn't work on frequencies lower than 2 MHz (STM32F103 Bluepill)

I am working on a low power project using the STM32 "Bluepill" and I would like to use an LCD without the need to set the frequency for the HCLK (Core Clock) to anything beyond 500 kHz. ...
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LCD does not have Register Select or Read/Write pins. Instead has FLM, LP, CP, and M pins

I have a old Optrex DMF6127N LCD display. I can not find any datasheets for it online (I believe it was made specially for AT&T's Bell Labs) and am trying to get it to work. I have looked at ...
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LCD Backlight control brightness adjustment & cathode pin purpose

I'm working on an STM32-based project to which I'm planning to connect an LCD (in my case, it should be 800x480, specifics irrelevant for the questions). I do have disco development boards with LCDs (...
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Can HD44780 communicate with FSMC?

I am trying to use FSMC instead of I2C parallel interface to communicate with HD44780 LCD controller. FSMC is connected to SRAM and HD44780 at the same time and the clock frequency is MHz. The clock ...
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Why do LCDs use flex connectors and can I replace them with normal wires?

I'm working on a project with a touch 7 inch LCD and a Raspberry Pi. The 7 inch LCD came with a driver board and a flex connector for the LCD and the touch. Are there any adapters that I can get to ...
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How to reattach LCD to pcb that has power but no data?

Where do the lcd data connectors actually attach? I have been researching to attach lcd to pcb but every example I find has notiable pins from thw lcd. I can see the pins on the board but how do they ...
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HD44780 based 20x4 LCD delays in printing

I am using my HD44780 based 20x4 LCD with the famous I2C backpack, AKA the I2C I/O expander module, the PCF8547, the I2C I/O expander module is connected to the 20x4 LCD and is connected via the I2C ...
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Help regarding identification of a DC-DC ic bearing the print "ER=1B 73H" in a faulty BOE-hm185wx1-400 panel

I am having a faulty BOE-hm185wx1-400 panel, where the MLG voltage has dropped to 15 V instead of the usual 25.4 volts. After a bit of diagnosis, it appears that the DC-DC ic below is possibly faulty. ...
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CC2541 Interface with ST7789V based 1.14" TFT Display

I am working off a custom board having CC2541 from Texas as the Main Controller and a 1.14" TFT Display being controlled via ST7789V Drive IC. These two are connected over the SPI Interface. ...
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