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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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487 views

LCD TFT Backlight voltage?

I was wondering if my display backlight could be driven by a voltage of 5 V. The datasheet (see image) says that it only needs a current of 60mA so could I put in 5 V and a 80 Ω ...
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How does integrated displays controlled by the computer?

Consider a run off the mill pc: lcd displays connected, you have brightness control in the menu of the lcd. And some other stuff like color temp and modes. Now consider a laptop, AIOs and kiosk PCs. ...
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AT89S52 microcontroller only starts when extra 22uF capacitor touches board

I made simple code for the microcontroller that prints a simple message on the LCD once the microcontroller starts. I arranged my board so that the pull-up resistors and reset resistor (100K) and ...
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LCD leaking power through I2C cables

Background I have a NodeMCU and two LCD devices and an ADS1115 on one I2C bus. The LCD devices have I2C backpacks. The NodeMCU is on 5V USB power and internally operating at 3.3V. The other devices ...
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118 views

SPI slave without MISO pin

I'm designing a circuit with this LCD display. It will interface with STM32L0 MCU over SPI bus. as you can see, in LCD's datasheet there are only 3 lines of SPI pins. SCL - Clock, SI - Serial Data and ...
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1k views

How much current does an 1602 LCD draw? [closed]

I want to know how much current a 16x2 (1602) LCD draws when the backlight is OFF and ON? NB: My multimeter is broken.
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64 views

LCD module not initializing

I've got a project where I need to use an LCD module, so I started pondering around with one (1602A). So far I've wired it up with my microcontroller which is an Atmega168PA and written an ...
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180 views

Is it possible to display HTML page on a LCD display of a discovery board?

For a start my intention is to make a simple webpage with a couple of virtual buttons to control PWM signal. My board is STM32F429I-DISCOVERY with STM32F429ZIT6 microcontroller and 320x240 color ...
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80 views

What limits native color depth of cheaper LCD panels?

Many cheaper LCD panels have native color depth of 6 bits per channel. This makes manufacturers of monitors implement dithering to avoid banding. But what actually limits the panels in their color ...
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58 views

LCD 20x4 Only Show Fist and Third Rows Pixels On

I have a LCD 20x4 display this display works fine but now it shows first and third rows all pixels On. I am using 4MHz crystal oscillator. That is happen when Vss, Vdd, Vee, RS, RW, E, A and K pins ...
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57 views

Where to apply manual delay in character LCD

I went to http://www.elm-chan.org/docs/lcd/hd44780_e.html in an attempt to find out how to make an LCD module work with the shortest timings. While the site does help with the initialization of the ...
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53 views

LCD contrast switcher for 8051

I'm trying to come up with a good circuit from common parts that will allow me to set predefined contrast levels to the LCD from the microcontroller. I've seen an example on the internet but its for ...
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71 views

Monitor displaying negative colours [closed]

I found an LCD monitor on a rainy day and I had to completely disassemble it in order to remove all the water. When I dried everything and reassembled it, its colors were inverted! I wasn't really ...
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544 views

UV light masking and LCD screens

Not sure if this is the right stack to ask this question on, but it relates to an engineering project that I and a student electrical engineer are starting. Can an LCD screen be used as a masking ...
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235 views

STM32F429i LTDC + SDRAM Buffer Issue

I have been trying to learn the basics of STM32 LTDC peripheral to drive a 4.3" 480 x 272 LCD using STM32F429IG mcu. I am using the Open429i dev kit by Wavehshare (https://www.waveshare.com/core429i....
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382 views

Can you damage an LCD screen with a camera flash, high-powered flashgun/speedlight?

I'm curious as to what the limitations are in regards to uv radiation on LCD screens when subjecting them to high intensity light sources such as camera flashes (such as a nikon or canon speedlight). ...
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235 views

How to interface with micro LCD projector?

I disassembled a cheap "wall projection" clock: And removed the LCD board that displays the projected clock readout in front of the super bright red LED: As a small hobby project, I'd like to wire ...
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321 views

What lvds connector do I have

Can someone help me find out what type of LVDS cable I have and point me in the direction of an adaptor to HDMI. Thanks. Backstory: I recently had to throw out an old Sony Vaio All in one PC and ...
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69 views

Driving animation on an LCD using microcontroller

I was running into issues with SPI bandwidth limits with a specific microcontroller I have been asked to use. It was limited to 6MHz SPI frequency which was limiting me to a 128 by 128 display with 16 ...
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1answer
156 views

Is this ST7735 based LCD module broken? (Photo: random color pixels on the entire screen)

I have been testing my LCD module. I think it is burnt, although I hope not.... Can anyone confirm that I just badly programmed? I try to send a pixel(green, red, black whatever the color is) to the ...
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181 views

I don't fully understand Amps

I am a hobbist in electronics, meaning I don't have any really training on electronics. Anything I know about electronics is read from books, YouTube or this site. I am trying to design a circuit ...
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1answer
49 views

LCD module with backlight

I am using COG-C144MVGI. I am trying to turn it on with my Raspberry Pi. I am not sure if I am following the "power on sequence" correctly. Does this kind of LCD modules work without backlight? I am ...
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Difference between RGB TN and RGB IPS display?

While I know the pros and cons of each type of screen and how IPS is superior to TN screens in viewing angles and color reproduction I'm trying to understand how these two screens operate differently. ...
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538 views

Partially broken LCD missing segments [closed]

This cordless phone just started not showing some of the segments of the display (here it should show NS AMERICA). I thought those segments were just broken, however sometimes they are all working ...
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85 views

Checking my understanding of this datasheet of a TFT LCD display?

I'm trying to modify an HDMI decoder board by Adafruit(https://learn.adafruit.com/adafruit-tfp401-hdmi-slash-dvi-decoder-to-40-pin-ttl-display/downloads) to work with an IPS screen that has a 51 pin ...
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91 views

Doubts about replacing an LCD display [closed]

I have a device with a lcd (1602) that needs to be replaced but I'm not sure about finding a compatible one. The part number is BC-1602B-SBYA-I-B-A00 and according to the specification pdf it has an ...
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53 views

Can the TFT in LCD displays be made in the nanometer range?

Can the TFT elements and hence the pixels in an LCD display be made in the nanometer range? Say 10nm x 10nm?
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58 views

Does a 16x2 LCD display has its own EEPROM?

I want to know the "internal parts of an LCD"... but I can't find any from the results. https://youtu.be/dZZynJLmTn8?t=2m40s @2:40s "....according to the ASCII" does that mean ASCII is stored ...
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192 views

XV0 and V0 - what does it stand for?

I'm looking for suitable GLCD, so far I have found the RX12864H, however the datasheet describes a lot of voltages and I'm bit confused. While the VSS and VDD are clear to me, I have no clue what do ...
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691 views

AMOLED display vs. LCD display: Power consumption when displaying white only?

LCD's power consumption only depends on the screen brightness setting, not on the displayed content, unlike AMOLED, where brighter colours (towards white) cause more power consumption, while black ...
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1answer
177 views

What is the difference between MCU and TTL screens? [closed]

I'm trying to build a HDMI decoder board for a 4in 480x800 IPS display. I found an HDMI decoder board on adafruit(https://www.adafruit.com/product/2218) which says it works for most 40pin TTL displays....
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51 views

Display Driver for a SHARP LS020B1DD01D LCD

I am working on a personal project that will feature an LCD panel and push buttons to control the graphical user interface. For the LCD I would like to use the SHARP LS020B1DD01D (for the ...
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40 views

Interfacing NT7605-based LCD with MSP430

I've spent the last week or two trying to get my MSP430 to communicate with an NT7605-based LCD. I found this post with a very similar problem: Debugging initialization of LCD with NT7605 driver I'...
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LCD panels used in projectors - What are their limitations?

It's important I point out immediately that I am an absolute novice at all this. I am trying to self-teach myself the basics by building things but it is a slow slow process. So please bear with me if ...
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26 views

CPT LCD display part number explanation

Does anyone know what the letters of Chunghwa Picture Tubes LCD mean in the part numbers for example 7" or 6.95" displays of a series all start with CLAA069LAXXX where XXX is a random assortment of ...
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2k views

Terminology - VDD vs VSS?

What is the correct voltage terminology for VDD and VSS? I've been installing a Winstar WEH001602D OLED and was struggling until I realised that it appears to have pins 1 and 2 reversed compared to ...
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13 views

Segmented Display With SMD Pads? (Not Thru-Hole or Half-hole SMD) [duplicate]

I'm looking through a product design, and I've seen these SMD / sticky segmented displays LCD being used. They are not hand-soldered, the segmented display appears to use some conductive sticky pad ...
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1answer
212 views

So there was an ant that somehow got inside my screen. How do I remove it? [closed]

Wondering if it's possible to remove the LCD screen without damaging it. I noticed there are six black metal thingys at the back of the module that is twisted up holding the LCD in-place, is it safe ...
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2answers
180 views

ssd1306 registers

I got confusion while reading datasheet of the OLED display(128x64).I do not understand why to use two column start registers. https://cdn-shop.adafruit.com/datasheets/SSD1306.pdf
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176 views

Why do we need sync pulses in digital (LCD driving) context?

I am studying how to drive LCD TFT display with the microcontroller (STM32F746). The manual mentions that I have to set up timings for HSYNC, VSYNC, VBP (Vertical Back Porch), VFP (Vertical Front ...
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122 views

How do LCD screens repair themselves?

Hey, electronics people: A few months ago, I cleaned a spot on an LCD flat screen. Whatever it was, it was stuck on there pretty good and I guess I pushed down on it too hard (actually wasn't hard at ...
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1answer
103 views

LCD SPLC780D Initialization sequence fails

Microcontroller model : PIC32MX340F512H LCD controller : SPLC780D LCD module : MC42005A6W-FPTLW3-V2 (20*4) I have been struggling for two weeks to get a SPL780D based LCD module to work. I checked ...
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1answer
244 views

How generate a square wave from a DC voltage to power on LCD crystals?

I got a small LCD and I would like to power it to show the LCD crystals turning to black. I would like to show at which voltage the LCD crystals start to turn black. I did some research about LCD ...
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1answer
64 views

Debugging initialization of LCD with S6D05A1 driver

I'm trying to get this 320 x 480 LCD going through SPI (4 wire 8bit) for a while now but no luck. It seems like the resolution is not defined as should during init but I can't see how. Here what I ...
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2answers
400 views

Connecting LCD Display with I2C USB Connector

I have a qapass 1602a LCD display connected to an I2C 1602 LCD Controller which is connected to a UMFT201XB I2C USB Connector which is connected to a linux box. My Question is: How and where do I get ...
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1answer
49 views

How to discover LCD controller model

I'm trying to read a graphic LCD, it seems to have 128 x 64 dots. It communicates with an ARM STM32F103 via SPI. I intercepted the communication between the LCD module and MCU, and decoded part of the ...
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50 views

LCD default boxes not showing when contrast pin is hooked to old-fashioned regulator circuit

I have an HD44780 compatible character LCD display (2 rows 16 characters a row) powered with 5v through a regulator (4.97V according to voltmeter). If I connect a 2.2K resistor between the LCD ...
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1answer
171 views

Learning the Art of Electronics - LCD

The digital chapters of LAoE require a custom display with added functionality that is not sold in the UK (details on the LAoE website at the link below). Do you have any ideas for an alternative ...
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2answers
452 views

Using old laptop LCD as external VGA screen [closed]

I have a few old laptops with good LCD panels that I wish to salvage and use as external VGA screen on other computers. I'am no expert in electronics but I work with computers and know the basics of ...
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2answers
136 views

Measure High Dc Voltages 0-150V using a STM32F446RE MCU

Does anyone have any suggestion on how to build a circuit that can convert high Dc voltages from 0-150 V to lower voltages so that I can use my MCU to read them and display them on my 16x2 LCD?. I ...