Questions tagged [display]

Questions about LCDs, 7-segment LEDs, E-ink displays, etc.

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How to connect a cellphone screen to Raspberry Zero

I need to connect a Umidigi A5Pro cellphone display to my Raspberry Zero 2W. How can I do this? I'm new in electronics...
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STM32 Nucleo f401RE 1.44 inch OLED ST7735

I try to drive ST7735 OLED display with nucleo board. I worked with a ready-made example I found on the internet, but I could not print anything to the screen. When I compile my code, I don't get any ...
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TFT-LCD VCOM powered by LDO

Is it possible to generate VCOM voltage for TFT-LCD display by LDO? I am considering using MAX16929 for generating AVDD (9.6V), VGL (-6V), VGH (18V) and VDD (3.3V) for touch controller, but remaining ...
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ESP32 + ST7735S display circuit diagram

Is the circuit diagram correct? I am not sure about the connections marked in purple. I am still entry level at this. Edit: The purpose of this circuit is to be powered from a Li-Ion Battery. Vbat is ...
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-2 votes
2 answers
108 views

How do seven segment displays show black numbers?

Usually, seven-segment displays emit red coloured light, which is understandable. But in digital watches, the common colour used for the numbers displayed is black. But black light itself can't be ...
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i2c oled display problem with STM32F401RE Nucleo Board

I have an i2c oled display with an SSD1306 driver. I want to drive this display with my nucleo card. Pin configurations are shown below. I provided the i2c connection on the display via i2c1 on the ...
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1 answer
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Interfacing LM3914 to CMOS logic circuitry

I built the ubiquitous battery voltage monitor using the equally ubuiqutous LM3914. It monitors a 12V battery and controls a charger. The datasheet mentions the IC can interface with TTL or CMOS logic,...
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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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3 votes
3 answers
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Turn screen on/off with an N-channel MOSFET

I have a display monitor that is connected to a Raspberry Pi, all running off a battery. Most of the time the monitor is not used so I'd like to turn it on only when required, but I also would like it ...
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1 answer
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Advice for where to start when choosing and working with a touch screen display for the first time [closed]

I am looking to utilize a touch screen display in an ongoing project and have not ever had to use one before so I am starting from ground zero. I was hoping to get some general advice on what to start ...
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Interfacing with a micro display module

I'm planning a project for which a tiny (maybe 1-2cm diagonal) display would be ideal. Some devices exist (mostly for camera viewfinders or projectors) but I have no idea about how to interface with ...
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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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Nokia display stopped working

I had plenty of Nokia displays so I decided to use them with microcontrollers. I found pinout instructions from here, connected one of the 3310 LCDs with my ESP32 because it runs on 3V3 and using ...
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Directly connecting MIPI Camera and Display

I have a little bit of a hard time wrapping my mind around MIPI. My mission: I want to connect a MIPI camera directly to a MIPI display. Camera pin-layout: Display pin-layout: The Interface of the ...
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1 answer
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Help driving a display

I am trying to figure out a way to drive this LCD display, the datasheet can be found here https://datasheetspdf.com/mobile/611974/LG/LB070WV1/1 on page 8 it has some info on the connector/interface ...
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Can I and how I use datasheet registers to activate scaling up on the RTD2660 display controller?

I have a chinese display with hdmi driver board using RTD2660 controller chip. I want to use it to mod my Playstation portable with a bigger screen, but the problem is that psp outputs image with ...
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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 to supply an OLED module with 13V?

I have an OLED module that uses 3V for logic signals and 13V for the LEDs. What is the common way to drive the 13V for OLEDs? With a regulator or some kind of special LED driver? I have seen some LED ...
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calculating if heat from regulator can start a fire or melt ffc

I have a flat flex cable (to a display module) close to a regulator (maybe the ffc are even touching the regulator) in a product I am making. Worried about if the regulator's heat will destroy the ...
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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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1 answer
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Why does broken monitor have vertical lines [closed]

I unfortunately dropped a pointy object and it pierced a tiny area of my monitor (AOC U32E2N). I was surprised to see that the whole area of the impact (where physical damage can be seen) is ...
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What is the interface type of this LCD?

I'm trying to find out if this LCD uses eDP, or MIPI DSI, or something else so that I can choose a replacement LCD, and I'm a beginner at this. I wasn't able to find it on the manufacturer's website, ...
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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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Transparent displays that allow UV light/sunlight to pass through them?

Is there a type of digital display that can work to let sun through it, so that the dark pixels block the UV, and transparent pixels let the UV through? I'm aware of monochrome LCDs for a resin ...
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1 answer
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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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Are rgb changes affected by monitor response time?

If I'm not wrong, response time on monitors just has to do with how dark or light the image is. In that case, if a monitor has a dark blue frame followed by a light red frame and response time is 10ms,...
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1 answer
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Do frames start to display during the end of the previous frame or during the beginning of the next frame?

If one frame is transitioning to another frame, and a monitor has a 4 ms response time, does that 4 ms transition happen at the end of the first frame so that the next frame displays on time, or does ...
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4 votes
2 answers
688 views

Russian к2лн641 VFD (Vacuum Fluorescent Display) driver pin out help

I have recently acquired some IV-3 VFDs (Vacuum Fluorescent Displays) and they came on an old PCB with drivers. The driver is a к2лн641 and have found a datasheet on it with some information, but it ...
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2 answers
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Am I crazy or has my collegue made a mistake?

I am reviewing a prototype design that someone else made. In the design, they use this part. See image. There are made holes in the PCB for the green marked plastic pins but only exposed surface ...
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1 answer
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How can I feed images from a Raspberry Pi to a very old handheld projector?

I have this very old handheld projector: And its connector cable looks like this (5mm wide, white), if I am not mistaken: My questions are two-fold: Can anyone guess what standard/format of input ...
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ILI9341 display interfacing with stm32f103c8t6 with TFT_ESPI library

I am trying to configure stm32f103c8t6 bluepill with ILI9341 display using the tft_espi library . Connection stm32 ILI9341 PB15 -> MOSI, T_MOSI PB14 -> MISO, T_MISO PB13 -> SCK, T_SCK PC15 -&...
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How to connect a display with MIPI DSI connector X to a board with connector Y?

I want to connect a touchscren display to a development board via MIPI DSI interface, but their connectors do not match. The display uses a 30-pin FCC, 1mm pitch, double-side contacts connector (link ...
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1 answer
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Synchronize IR sensor output and HDMI (FPGA)

I'm having problems when trying to synchronize output from IR camera and hdmi transmitter. I use cyclone FPGA and ulis IR sensor, for describing how I use Verilog. Sensor frame rate is 60 fps, same ...
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0 votes
1 answer
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Breadboard-type interface to ILI9341 ST7735 TFT display

I have an ILI9341 ST7735 240 x 320px display which I bought intending to use with a 6502 IC. However I cannot find any details online of the basic method of interfacing - all electronics projects seem ...
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2 votes
1 answer
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Difference between LVDS, MIPI, DPI and DSI

I'm on a project that involves TFT displays and Raspberry Pi Compute Module 4. I noticed that there are several acronyms, protocols confusing information. As I understand it, there are protocols: DBI:...
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1 vote
1 answer
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SSD1351 PMOLED display pixel color affected by other pixels on the same row

I am currently writing software that makes use of a SSD1351-based display (from Waveshare). I have noticed an issue most visible with a dark blue background: when some brighter colors are on the same ...
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Using an RGB TFT screen on the Raspberry Pi 4

I want to use the HT0700EI02A TFT screen on the Raspberry Pi 4 Compute Module. Raspberry Datasheet: https://datasheets.raspberrypi.org/cm4/cm4-datasheet.pdf Screen Datasheet: https://cdn.ozdisan.com/...
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0 votes
1 answer
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Custom TFT Screen Question

I'm looking to get a custom Resistive Touch TFT screen made for a project. The company have specified that the screen will utilize a F31L-1A7H1-11040 type connection to go between the screen and ...
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6 votes
3 answers
1k views

Why do LCD screens need to refresh in the first place?

I understand how screens display something; essentially by refreshing very fast so that any changes are quickly visible. However, to me, this seems like a very inefficient way to solve the problem. ...
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PAL Video - Horizontal Color Pixels

I've created an 8-bit VGA controller that outputs a 400x300 RGB signal. I also want to implement an AV output using PAL encoding. I don't understand how I can achieve the same resolution since the ...
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1 answer
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TFT display wiring on Sparkfun Pro Micro

Please help me configure the wiring for this TFT display. I’ve tried using the Waveshare TFT display with both the Sparkfun Pro Micro and the Raspberry Pico but had very little success. Only the ...
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0 votes
0 answers
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Non white lines on 1920x180 LVDS controlled TFT

We are integrating a LVDS 27" 1920x1080 panel with a commercial DVI to LVDS controller board. We have a PC, that has a DVI output, and we connect it to the Video controller. The video controller ...
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1 answer
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Understanding image display on a TFT/LCD display

I am doing some reading about interfacing displays with an MCU. I came across this block diagram: About the display controller, the following is mentioned: The display controller is continuously “...
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1 vote
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Overvoltage shut down

A LCD display controller includes a 5 times DCDC converter. A circuit is needed to ensure that the in case of a fault in the display the 5 times voltage can not return to the CPU circuit in anyway. ...
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What refresh rate do digital stopwatches use?

We've all probably come across these kinds of electronic stopwatches at some point: They almost always claim to count centiseconds (although this one counts in milliseconds), but do they really have ...
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1 answer
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Can I use unregulated power supply for LCD display backlight LED?

I am designing a PCB for a university project that will include an LCD display which is powered by 3.3VDC regulated supply. Unfortunately this display has backlight LEDs in series that have total ...
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2 answers
103 views

Inappropriate readings of pulse and temperature sensor (LM35)

I am facing quite a bit trouble with an LM25 temperature sensor. The readings are a bit too high (90-120*C) for room temprature. I have tried thefollowing things to get an expected result but none ...
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3 votes
1 answer
166 views

1980s AVTEL 4 colour mechanical display, how is the pixel state reset?

I stumbled on a retro Dutch video from 1983 where a large four color mechanical display is shown. Each pixel consists of a cube which can be turned in order to change the pixel color between 4 colors (...
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What is the infrared controller in Nook Simple touch?

I got an old Nook Simple Touch from my brother and it worked before. But it has been covered with mold so I removed the plastic case and it still boots, but cannot respond to any of my touch. I found ...
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GMSL Deserializer to LCD Link Rate

I need to calculate the Link Rate for my GMSL Deserializer which is connected to a 800 * 480 TFT Display. In that case, I stumbled upon this Article On the last few lines, they are asking to multiply ...
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