Questions tagged [display]
Questions about LCDs, 7-segment LEDs, E-ink displays, etc.
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EDID emulation in HDMI and DisplayPort, is DisplayPort really more difficult?
I've been doing a lot research on EDID and HDMI and DisplayPort and I have a question about the relative difficulty of always-on EDID Emulation between the two specs.
With HDMI, almost every Matrix ...
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ILI9341 TFT display in XIAO ESP32 Seeeduino MISO issue
I am using a XIAO ESP32 Seeeduino with an ILI9341 TFT display that is working great. The touch screen is also working well.
The problem is that I have to disconnect the MISO connection every time I ...
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Controlling the brightness of a hdmi controller [closed]
I've got a hdmi display controller (board)
5" inch LCD Screen ZJ050NA-08C 640X480
Connected to my Raspberry PI zero.
I see some inputs on the board.
Is it possible to control the brightness of ...
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E-Ink with Atmega and avr-libc
I am trying to understand how to drive an E-Ink display like the Adafruit 4196 with i.e. an Atmega328 with avr-libc.
From what I could learn so far, I would write the image/text to a frame buffer and ...
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Splitting video output from 30 pin eDP
I'm trying to display the same video output on three different LCDs, each taking a 30 pin eDP input. I could get three control boards, one for each display, and get a splitter that splits a single ...
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1
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Why does this LCD screen need 23.6V power supply for the LCD?
I am looking for a graphical display that I can control using TTL-level signals (e.g. an Arduino MEGA2560). I have found this display from Mouser: https://nl.mouser.com/datasheet/2/291/...
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Custom TFP401 based display color/frame issues
We have just designed a board using a TFP401A to decode an HDMI signal into a 24 bit parellel RGB signal that is then sent to a standard 50-pin TFT display module which uses a 24-bit parallel RGB bus. ...
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Simple low-power LED display
I am trying to build a LED project and I am looking for a little help to get started.
I’m aiming to build a small, low-power LED display of 6 - 10 low-power white LEDs. It will have 2 small coin cell ...
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DisplayPort Alt-Mode and USB4.0 port on USB Type-C Connector
I'm building an AMD FP7r2 based platform and I have a USB Type-C port to which I want to connect USB 4.0 signals.
The USB4.0 signals can be also used for DisplayPort (the APU supports this switch), ...
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Leading zeros on digital display: show or hide?
In everyday use of numbers, we normally show or write a leading zero only when it's the lone digit left of the decimal point. (Setting aside clocks.)
However, I've noticed that on some digital ...
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Connect OLED display to dev board
I want to use a small OLED display for a project. I need a color display as small as possible and I found these models that would be good for my application:
MDT0096AIH-SPI
MDT0096AISC-SPI
I will ...
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STM32F407 + LAN8720 status LED keeps blinking fast, error?
I made a custom board around STM32F407 MCU that is connected with a PHY Board with a LAN8720 IC via RMII. I also have connected an 2.42' OLED Display based on SSD1309.
I notice when I turn on the OLED ...
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What’s the purpose of C1554 with this IC? I could not find a datasheet
This is a display IC for an iPhone 6. There was no display and all voltage outputs from the IC were 1.8 V (which is wrong). I finally traced it to shorted capacitor C1554.
What is its role? Is it a ...
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Do we have to set the ST-link v2 before using?
I was using the ST-Link V2 which shown below on the left side. When I connect it to the MCU's I/O, I could install the software and I could confirm that the software installed correctly from the ...
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Screen for RasPi - scavenging from useless "tablet"?
I found an old WinCE machine with a completely useless platform - however the screen would be perfect for a Rapsberry project.
Problem is: the sticker either does not have the real model number or ...
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Does VGA DB15 have the same pinout as VGA DE15?
I am building a small device with VGA for the display. Sadly the diagrams I am using are for a 15 pin, 2 row connector, and I would like to use a 15 pin, 3 row connector for compatibility.
Do they ...
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Is there a difference between RP2040 pins and pi pico pins?
I’m trying to make an embedded system with a RP2040 chip at the center. I’m trying to connect a display to the RP2040 and all I can find is pico diagrams, so aside from pins that don’t exist on the ...
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SSD1306 OLED display, howto: Set Display Start Line (40h~7Fh) in page addressing mode?
I'm trying to erase the display in Page mode addressing.
Having understood Page and Columns like indicated in figure: 10.1, page 34 of the datasheet.
But what is the correct "Set Display Start ...
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Is there a standard for mobile display connectors?
I want to build something using displays from old mobile phones, but I don't know how to search for some experimental connector/adapter that "magnifies" those small printed flexible pins to ...
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Vacuum fluorescent display: What if you power the filament (cathode) with a high voltage and the segments (anodes) with a low voltage?
This question is asked because it isn't a stupid question when never be asked before. I didn't find anyone who mentioned this or even tried this.
What if you power the filament (cathode) of a VFD with ...
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How to power up a display before the controlling MCU?
To write a driver for a display I set up up the following circuit:
simulate this circuit – Schematic created using CircuitLab
Whilst developing the display driver I would regularly plug in the ...
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Identify IC with label removed [closed]
I have an IC which is used for a display that has the IC chip number scratched off. The reason being more than likely that the board would be fairly inexpensive to produce but the combo board and ...
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How can front- and backporch in TFT displays be inexact?
Today I had the question as to why front- and backporches in TFT displays can vary. There is this image (from https://www.youtube.com/watch?v=hnzhK5Vvvao) which shows the HSYNC, HBP, Active Width and ...
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How can I drive a 14-segment alphanumeric display?
I am trying to use a common anode 14-segment dual-digit alphanumeric display using a PIC16F877A. As far as I can find online, the MAX6955 pops up everywhere. It looks like a complicated chip to work ...
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Vacuum Fluorescent Display Failure
I have a VFD (vacuum fluorescent display) unit from a piece of test equipment that has developed leakage between the anodes (plates). This leakage (~50 kΩ to ~250 kΩ) has been verified after ...
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Driving a DVI monitor from a monochrome source
I have a plasma display EL8358MS that is defective (burnt out.) The display has a signal convertor with these inputs:
...
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How are electric current X-Y coordinates achieved for each individual pixel in a monochrome LCD display?
I took apart a simple blue monochrome LCD and layed out all the layers as pictured below.
Just looking at them, I am confused as to which of these layers is responsible for turning the current on/off ...
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Can I forgo using an RTC for this circuit if my intent is to set up a clock, a chronometer, a timer for shutdown and PWM LED lamps?
Here's what I'm going to create (hopefully): An electronic candle with flickering lights (via PWM) that also shows the current time (digital clock), the time transpired since it has been turned on (...
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How can I re-assemble this cheap scale's LCD display?
I had to disassemble a cheap kitchen scale for cleaning after it stopped working because of fluids. To my surprise I found the LCD does not seem to have a physical connection, but some sort of ...
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Why aren't there displays which explicitly emit certain frequencies?
Rather than building displays that emit RGB, why not build displays that emit certain frequencies instead? What are the technical challenges of doing this?
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Help identifying LVDS display connection type
I have a new motherboard arriving with this connector attached but I need help identifying what display type this LVDS connector uses. I don't think it's MIPI or the standard LVDS but I can't tell.
In ...
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Check status of MIPI-DSI device (check display is functioning)
We have a MIPI display driven from a dedicated controller/converter which accepts I2C commands and can translate them to/from MIPI DCS commands.
On occasion at power-up the display itself does not ...
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Wrong display technology used in design. Cable comes off
This question is about the search term to use and technology names and not specific parts (since I don´t think that is allowed).
I used connector SFV24R-4STBE1HLF together with this display cable. See ...
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Reset of TM1638 display driver
I am trying to run a TM1638 display off the 6-pin program header of an ATMEGA328P that uses pins PB3, PB4, and PB5.
The screen works fine, but the programmer works only if the screen is not connected.
...
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Display contact using foam - how is it working? [duplicate]
I was pretty stunned when I disassembled my Sonoff TH Elite by the way the display was connected to the PCB. Somehow the "foamy" piece is pressed onto the blank contact surfaces of the PCB ...
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ST7735S Update memory without updating display
I am designing firmware for a 80 x 160 TFT display controlled by an ST7735S LCD controller. As expected, the screen takes about 0.25s to draw an entire frame due to the speed limitations of the SPI ...
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Unable to display entered digits via KEYPAD-PHONE in Proteus correctly
I've started doing some project that includes displaying entered digits via keypad phone in Proteus. I'll leave a screenshot below, so this post doesn't look undefined. You've probably seen this ...
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Getting AV video from RGB or VGA or HDMI [closed]
Which is the simplest option? In order to get Composite video with NTSC/PAL video we will use a CS5213 to convert HDMI to VGA, then use some resistors to get Composite video with NTSC/PAL. Then I ...
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Activating an Active Buzzer from PWM Signal of an LED driver
I would like to turn on an active buzzer TMB12A05 using the decimal place output channel of a TM1638 display driver that is designed to drive LEDs using a PWM signal.
I considered using a passive ...
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What type of connector is this - Barco/Philips TSM12PHC
I have a Barco TSM12PHC also known as Philips TSM12PHC from a cardiology. Unfortunately, I am missing the power supply. I know that the display takes 24V at 0.8A. The first three pins are positive and ...
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STM32H745XI graphical display
I am planning to interface an STM32H745XI to a 1400x480 display. The maximum resolution given for the STM is 480×480. I understand that this is the maximum frequency the device can actually output.
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What happens if we provide lower than specified VPP voltage for an OLED display?
I came across these cheap 1.3" OLED displays (the bare display) based on the SH1107 controller. I bought a few items and when I took a look at their ready-made modules I noticed a relatively ...
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HDMI Debug Help
I have a custom PCB that contains an iMX8 module and a HDMI connector.
The iMX8 module when connected in the manufacturers dev board can drive the HDMI display.
From my custom PCB it cannot drive the ...
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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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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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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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