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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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Why are there air(?) bubbles within my LCD?

Photos: https://photos.app.goo.gl/BvqLVYkMBB7RjaMU7 (Nexus 9 Android tablet) My daughter's tablet is enclosed in a full-body case, so it's fairly well protected. Still, somehow, at some point I ...
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Why do we need to continuously refresh a high resolution graphics LCD while we don't need the same for a character LCD?

It is very easy to interface an MCU with a character LCD (let say, 16x2, 20x2, 20x4, etc.) because we don't need to constantly refresh what is displayed. Once we send what we want to see, it is ...
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STM32F746 Nucleo with FMC LCD

I am configuring a new LCD screen with parallel 8080 protocol (screen controller is SSD1351). I am using ST CubeMX to generate code for FMC (attached picture of the configuration). My problem is that ...
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Pin out clarification, I need some help understanding the pin outs

What do the pins "/CS", "SCK", and "SDI" mean? From my bad understanding of this diagram, I only have to run 3.3V to "/CS", "SCK", and "SDI". Is this true or am I way off? Let me know in the ...
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LCD display is garbled in between operations on STM32

I'm using a 16x2 LCD for a project on STM32F030R8. I wrote a library for interfacing and everything was working fine until recently. It displays garbled junk values in between operations, especially ...
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Which part of some LED TV screens acts as two gratings crossed at non-straight angle?

Some modern LED TVs display the following diffraction pattern (photos taken from this question): In my answer to another question about the origin of this pattern I explained that this should be due ...
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29 views

Not getting reading back from HC-SR04 with PIC18F45k50 MCU

Hello I'm trying to measure the distance with HC-SRO4 ultrasound sensor PIC18F45k50 micro-controller however, I'm not reading any value on the LCD screen. Here is the following code that I have ...
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84 views

LCD 16x4 is shifting the columns of the third and fourth lines

I'm using the PIC 18F4550 to write to an LCD 16x4. I used MikroC Pro for PIC to write the code and the Proteus to simulate. I'm using the library Lcd and Lcd_Constants already present on the ...
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51 views

STM32 TFT not displaying solid color

I am trying to use this display with an STM32F0 using SPI. I begin by setting up the peripherals using the following ...
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1answer
49 views

LCD suddenly stops displaying

I am using a PC2002LRU-BWB-H-Q LCD with a STM32F4 micro and is powered through a TMP10424. There is also some 3V3 and 5V modules to. The problem is that the LCD is displayed fine for over days and ...
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67 views

LCD Display behaving weird with STM32 [closed]

16x2 LCD operating in 4-bit mode. At first, I tried initializing the LCD in 4-bit mode using software. Did not work. After repeated tries however, LCD started working. But for some reason I had to ...
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Need to find out one “a-Si TFTLCD” driver

I need to work with one 5" TFT LCD working with STM32 MCU, So I find out one 5 inch TFT LCD wich in seller website don't have written anything about isn't the driver. The LCD specification in web ...
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29 views

Help identifying LCD

I have an LCD from some farming equipment that I need to replace as it is not working but I am having trouble identifying a potential replacement part. I have tried googling part numbers but with no ...
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1answer
63 views

What is the right order for 16bit data on 8bit 8080 data bus

I'm trying to create a program to drive a TFT LCD with an ILI9486 in 8bit but I don't know if I must send the configuration data and commands MSB or LSB first. The color data for the pixels in 16bits ...
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2answers
120 views

L293D DC motor affecting LCD display

In the circuit below, I have noticed that when the DC motor (12V) is disconnected, everything works nice. The LCD correctly displays what arduino sends to it. But ...
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voltage levels for lcd display

i intend to use WF101FSYAPLNGO display model of winstar, in its data sheet AVDD, VGH,VGL VDD, VDDT voltages are given, can some one help to find the difference between AVDD and VDD, is AVDD meant for ...
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connecting 6 bit 1 channel LVDS LCD to 6 bit 2 channel or 8 bit 1 channel LCD Universal Driver

I had an old laptop LCD screen with part number N154I2-L05 . It has 6 bit 1 channel LVDS connector input slot. so I have decided to use it instead of letting covered in dust, and I ordered an ...
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NodeMCU with JHD162A Lcd module display issue

I have uploaded a program to NodeMCU, to print "hello, world" on JHD162A 16x2 LCD module. But the text doesn't appear on the LCD display. Instead just black blocks appear on the first row on the LCD. ...
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1answer
38 views

Connect TFT LCD screen with flex band to breadboard

I'm asking for clues on how to do this, I didn't found much over the internet as everybody buys their LCD screens with a mounting to the breadboard of as a shield for arduino. The TFT screen I bought ...
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37 views

Changing flex connector on LCD motherboard

The flex connector from a Philips 236v4lhab motherboard has some of its pins broken. They are touching each other (8,9,10). Can't show it on the photo but have tested with the voltmeter. I'm wondering ...
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1answer
52 views

PIC MCU and LCD display 16x2 - strange behavior

I have a LCD display 16x2 connected to a PIC32MX470F512L. On PIC32 I configure all the 6 pins used to interface with the LCD as open drain outputs on 5V tolerant pins, I have 4.7K pull-up on each line ...
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1answer
97 views

Display input from multimeter on PC

I have opened a Multimeter (Model:DT830D) and I want to take the input that is fed to the LCD display and display it on my PC instead using the serial monitor of the arduino. But I am confused about ...
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34 views

LCD Counter and Hour Meter

In an electronic board I've found an LCD Counter and Hour Meter. Here's the technical information. https://docs-emea.rs-online.com/webdocs/001a/0900766b8001abd9.pdf Since it's very expensive, I ...
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181 views

STM32F4 Discovery + ILI9341 SPI + STemwin

as the Question says, I'm trying to run STemWin into STM32F4 Discovery board. It compiles well, but does not show anything. I think the LCD initializes, but after that, It does not work anymore. I'm ...
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STM32 - SPI - RTOS problem [closed]

I'm working on a project that uses a 2.8" arduino LCD. The LCD uses an ILI9341 driver. Now I'm testing this library: https://github.com/martnak/STM32-ILI9341 with an STM32F4-Discovery board (STM32F407)...
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2answers
72 views

IC has different pinouts on different packages? [closed]

I am going to use the HT16C21 LCD driver to drive my LCD. Looking at the datasheet (in the "Pin Assignment" section), I noticed that the IC comes in 4 different packages, each with varying numbers of ...
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25 views

Display Design - would combining OLED with a white source be more efficient?

To be clear, I'm not an electrical engineer, nor do I claim complete knowledge of how displays work. However, I have done research into displays (televisions, computer monitors, AMOLED phone screens)...
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51 views

Initializing ADC causes LCD to not display anything

I have been having some trouble getting my ADC to work so I have decided to give it a try by manipulating the registers. I have a textbook which outlines the steps and I think I have it finished, but ...
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1answer
113 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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40 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
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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
243 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
174 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
92 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
47 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
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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
32 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
134 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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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
63 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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34 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
84 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
78 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
43 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
226 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 ...
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1answer
569 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
207 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
423 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
52 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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56 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 ...