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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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Choosing the right display for a wearable medical band [on hold]

I am working on a project to build a wearable medical band. Please help me with what display I should use : TFT,LCD,OLED or some other. My main problem is that I was unable to find resourses which ...
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1answer
64 views

Are horizontal and vertical back porches required for digital video, and if so, why?

The necessity of vertical and horizontal front and back porches in analog video seem fairly intuitive to me, but why are they necessary for digital video at all? In this LCD module data sheet and this ...
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28 views

LCD 18 (6 x3 ) Pinout without Datasheet AW -60i LCM V4.1

I have this (18 X 3) LCD Pins, I need help to find the Datasheet or the pinout for it. AW -60i LCM V4.1
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2answers
62 views

Image memory on micro controller [closed]

I am trying to specify a microcontroller for a very simple task. All it does is show an image at boot up (which will most likely be black and white). The display itself is 240*240 and 12bit color ...
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4answers
68 views

Multi master SPI mode? Or any intelligent way to switch only time between two masters?

I have an LCD display which is powered from a pretty powerful micro, with GPU and all sorts of stuff. However, it turns out that it will take it over 5 seconds to boot the core. From a user experience ...
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2answers
129 views

What's wrong with my 16x2 LCD program and solder?

I'm a total noob on Arduino here, and this is my first project on 16x2 LCD, 4x4 keypad and others. So, the story is, after I uploaded the program for my group's Arduino alarm clock to the Arduino ...
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1answer
87 views

Where can I get a display screen with 30 Hz or less refresh rate? [closed]

I am experimenting with a camera recording a display screen. Based on what I have read - camera recording a screen will have flicker if the refresh rate and frame rates are not synced. My mobile ...
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1answer
28 views

Internal structure of LCD controller

I have the following diagram of a HD44780U LCD controller What is the difference between CGRAM and CGROM. What is DDRAM for ? Where are the customised characters stored ? What does it happen ...
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2answers
391 views

Can a MAX232 IC be used for RS-232C standard?

I have a GT01 Panasonic LCD which it's interface is RS-232C. I have read that the difference between RS-232 and RS-232C is their voltage level which it's ±5 V in RS232C. Can I use a MAX232 IC to ...
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1answer
28 views

Drive QVGA lcd with GPIO?

I want to drive a 2.2" QVGA LCD that has I80(Intel 8080) interface. I found that other people did it with microcontrollers that have XMEM(Atmega64) or FSMC(ST) . Now I want to know if it is ...
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1answer
66 views

LVDS display troubleshooting

I am currently working on a prototype connecting a SOC-board (Samsung ARTIK530) to a LVDS LCD display (DT070BTFT-PTS1). The display shows a very (!) distorted picture. I have tried fixing it using ...
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0answers
31 views

How Backlit LCD Moniter Works, How it Looks Without a Backlight

I'm thinking about repurposing an lcd backlit monitor's front panel as an 'overlay' type panel over something else without a backlight. My understanding of the function of a backlit monitor that the ...
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1answer
55 views

Parts inside a LCD 16x02

This picture is from an application note from Microchip about LCDs. I just disassembled a common 16x02 LCD and I want to identify the components shown in the Microchip's figure with the ones from my ...
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0answers
29 views

Zebra strips with possible gaps

My Breville oven display shows some missing characters and some dimmed characters, after 2 crosstown moves. I have disassembled other devices in the past, but those were repairs for other people. I ...
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1answer
64 views

Low voltage LCD glass displays

I have a simple circuit I built using a 7-segment LCD glass display and an ATTiny (just a simple timer for now). I was hoping to use the setup in a low power, single coin cell device (3.3V - 2.7V), ...
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0answers
45 views

Powering ILI9341 LCD from MCU IO pin

Looking at the ILI9341 datasheet Electrical Characteristics, I just can't find information about power consumption. The information is also missing from the LCD module datasheet (ER-TFT024-3). I know ...
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1answer
35 views

Programmatically determine the lowest waiting time for character LCD display

I made working code in an older microcontroller for a character based LCD that's based on the HD44780 chip. My code stops execution of everything else every 70uS to display one character from the ...
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3answers
159 views

Why aren't laptops with transparent displays a thing? [closed]

I just realized that the display on my 2012 Macbook Air is transparent. I had the screen brightness of the built in display on the lowest (off) while using an external monitor, and the sun came ...
1
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1answer
308 views

LCD pixels: how chess-board pixel fill patterns are called?

I have just recently bought a 4k hdr 55 inch tv (Vizio P55 F1). Here is photo of brightly lit pixels from https://www.rtings.com/tv/reviews/vizio/p-series-2018 https://i.rtings.com/images/reviews/...
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1answer
92 views

LCD SPI interface logic levels and SPI pinout

I am designing a circuit that includes this LCD and STM32L071 microcontroller. I have connected the LCD to 3V power net and the microcontroller to 3.3V power net. To communicate with the LCD, I need ...
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1answer
79 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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1answer
47 views

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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0answers
48 views

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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2answers
66 views

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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2answers
64 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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1answer
217 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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1answer
46 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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3answers
93 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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1answer
79 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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1answer
44 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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2answers
42 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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1answer
47 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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1answer
67 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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2answers
174 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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0answers
126 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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2answers
173 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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3answers
156 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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1answer
129 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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0answers
54 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
81 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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2answers
172 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 ...
3
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1answer
45 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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0answers
58 views

Transform TTL LCD Interface to new TTL signal

I am a begineer with electrical signals. I am looking for someone to point me in the right direction. I have an exsiting device that uses the interface in the second image as its output to the LCD. ...
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0answers
23 views

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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1answer
180 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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0answers
69 views

Trouble interfacing with this LCD. Why do I need SPI to make it work?

I'm trying to create my own version of an HDMI decoder board from Adafruit to work with an IPS screen that I have to work with a Raspberry Pi. The pinouts on my screen match almost exactly to the ...
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1answer
54 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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0answers
18 views

How to reattach an LCD whose contacts were glued to the board? [duplicate]

I was re-soldering the wires that lead to the battery case of my multimeter, however, the wires were soldered to the board under the LCD. I tried to move the LCD up a bit to reach them but them the ...
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1answer
75 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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0answers
114 views

Driving HX8357 LCD by software SPI

I bought this LCD: https://aliexpress.com/item/IPS-3-2-inch-HD-TFT-LCD-RGB-Screen-with-Adapter-Board-480-320-8080-Interface/32725982043.html Unfortunately, there is no schematic or any information ...