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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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LCD Entry Mode Set and AVR MCU

I want to simulate **the Entry set mode ** function of and LCD based on HITACHI 44780 Controller. (Here is the datasheet.) The "Entry set mode" is given the following code of the 8 bits data ...
learn design's user avatar
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STM32 - LTDC + DMA2D flickering and banding

I'm currently using an STM32H753 with 16bit SDRAM (IS42S16800F) to store an RGB565 buffer, with LTDC driving an 800x480 LCD. I'm using double-buffering, flipping the buffers in the LTDC vsync ...
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Unable to interface 192x64 GLCD (SBN0064g Controller) with Arduino

I have a LCD panel 192x64 GLCD It consists of SBN0064 LCD driver here is the data sheet - 19264 datasheet (DATA SHEET). I am unable to show any character on this display. The LCD is always blank no ...
Prathamesh Jadhav's user avatar
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How can I determine the power source priority in this LCD controller board?

This board has three power sources, i.e., two USB type C ports and one USB type B micro. I use one of the type C ports for power and data and the display works well, however, I need to design a power ...
KE Keronei's user avatar
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Common cathode LCD display, can a common anode LCD be used instead?

I have a GPS which uses a common cathode LCD and I need to replace it as some segments stopped working but unfortunately I haven't found anywhere I can buy it as this version is mass produced and you ...
const314159's user avatar
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button in touch GFX

, I want to be able to change the state of the button shown in the above picture, which is designed with TouchGFX, using the physical buttons on my microcontroller board. How can this be implemented?
Alireza ganjeh's user avatar
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Non-MCU Driver IC for 24 bit parallel RGB display?

I'm working on a project that requires a 24 bit parallel RGB display. I originally planned to drive it with an STMH7B3 MCU using the built-in LTDC interface. The problem is the LTDC interface uses a ...
podi_burke's user avatar
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LCD_TFT HSYNC | LCDTFT VSYNC | LCD_TFT DE

I have a 320*240 LCD with an ili9341 driver that I want to drive using the LTDC unit of a microcontroller. However, according to the datasheet, my LCD does not have VSYNC, HSYNC, and DE pins. Can you ...
Alireza ganjeh's user avatar
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STM32 DMA timer triggered at specific period with external trigger

I'm trying to interface a CPU that has a parallel bus, and trying to connect it to STM32. The CPU bus is connected to PORTD, I mean by that CS1, CS2, A1, and it's data bus D0 to D7. The CPU has IOWR ...
Andre's user avatar
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Troubleshooting e-Paper Connection Issues on Custom PCB Board: Seeking Advice

We are using a 0.97-inch LCD in our project. We customized the design in our PCB using the Despi-Co2 and designed it accordingly. Please see the attached image for the schematic diagram of our PCB. ...
Taimoor Malik's user avatar
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Fixing TFT flexible pcb [closed]

I have damaged the flexible/ribon pcb on my display (as shown in the pictures below). I was thinking about soldering it, but the traces are tiny. Replacement isn’t possible. What do you guys think i ...
Vid's user avatar
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Identify a SOT-23 IC inside a Canon Vixia HG20 LCD display

I have had a Canon Vixia HG20 for 15 years. Recently, I noticed a black LCD screen, so I set myself to take a closer look at it. Before replacing the flex cable and/or the LCD, I'd like to check the ...
tfm's user avatar
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Identify a “6C” SOIC-6 IC inside a Canon Vixia HG20 LCD display

I have had a Canon Vixia HG20 for 15 years. Recently, I noticed a black LCD screen, so I set myself to take a closer look at it. Before replacing the flex cable and/or the LCD, I'd like to check the ...
tfm's user avatar
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Connecting MIPI DSI 39 pin to 40-pin LCD touch display

My board is radxa zero 2 pro. It has 4-lane MIPI DSI connector with 39-Pin and 0.3mm pitch. MIPI pin details of radxa zero 2 pro: ...
TryCatch's user avatar
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STM32 LTDC design considerations with an 18-bit vs 24-bit RGB interface

I'm using a LCD with a ST7701S driver and it has an 18-bit RBG interface. To control it I am using a STM32H7 with the LTDC peripheral. I have been prototyping with the STM32H745-Disco which has a LCD ...
Alex Jegers's user avatar
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That is possible to write on LCD a variable?

i read the MC21605H6W-SPR3-V2 LCD Datasheet that work with SPLC780D https://newhavendisplay.com/content/app_notes/SPLC780D.pdf controler. And i don't understand how can i write a variable character ...
DamanZ4's user avatar
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LCD 16x2 not taking commands from MSP430FR2355

I have been facing this issue for about a week, and after hours of trying to debug it, I was hoping I could find some help here. I have been trying to use an LCD 16x2 screen (unaware of the exact ...
Pixeled's user avatar
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1 answer
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Emulating a defective LCD from a device and use another LCD

I have a device which has a defective LCD that is not produced anymore. Source info: https://www.mpc-forums.com/viewtopic.php?f=1&t=138491&start=30 The socket from the schematic diagram is ...
andre's user avatar
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Interface Parallel display - ESP32 [closed]

I accidently purchased a 2.4 inch Parallel display for my ESP32. After some reading I noticed that perhaps a SPI version would perhaps have been more simple. Display I am talking about is a NHD-2.4-...
Erwin Preshantram's user avatar
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LVDS Display connected to Deserializer clarification needed

I need to use an LVDS display in my project.The pin configuration of LVDS display is given below(I can't share P/N here due to NDA). As per my knowledge the PIN No 18 and 19 are Horizontal sync and ...
Confused's user avatar
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Load switch for sequenced application of voltage

This is a follow-up to my previous question. Now, in order to properly power up an LCD, the datasheet states to apply VGL first, then VGH and AVDD. I want to do this with the circuitry below. AVDD: 8 ...
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LCD power down sequence

I am trying to build my own gaming handheld. I chose a parallel RGB LCD (Samsung LTP500GV-F01). Using a boost converter by TI (TPS61085) I was able to generate all necessary voltages. (I know there's ...
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How do I control the brightness of a TFT LCD through SPI (No Backlight Pin)

I recently purchased a TFT LCD (GMT020-02 VER1.1) The screen uses the ST7789V LED Driver and does not include a backlight control pin, So Originally I though that it was impossible to control it (i.e ...
Trippy 741's user avatar
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Strange artefacts on LCD display being driven by FPGA

I'm trying to use a Tang Nano 9K FPGA to generate a good signal for a 4.3 inch LCD display with a 40-pin connector. If I display a checkerboard image like this then all is well. This code generates ...
Charlie Skilbeck's user avatar
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Powering options for Arduino project

For my project, I have these components: Arduino Mega 2560 Rev 3 HC-05 Bluetooth module LCD display Logic Level Shifter Currently I am powering the Arduino Mega using the Vin and GND pins via 6 AA ...
Vagabond4761's user avatar
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1 answer
155 views

How do I identify an unknown LCD controller?

Edit: I wrote a mail to Sitronix asking for docs for this controller, and they said it is ST7522, with public avalible docs. I'm currently trying to reverse engineer a device with an MCU, LCD, and an ...
vorobey's user avatar
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3 answers
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RC delay timer to power LCD

I'm looking turn on the power of an LCD screen from a Pi Pico with a short time delay (50-100ms) after the Pico is plugged in. I want to power the screen with VCC from the Pico (5V) and use a signal ...
printsmith3d's user avatar
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How do I best connect my LCD panel? [closed]

I have started an electronics project as a hobby that requires an TFT-LCD panel to be directly controlled by a Raspberry Pi / Orange Pi. More information: I would prefer not having a control board, ...
Lolmerkat's user avatar
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Puzzling 'conductor' in a bathroom scale [duplicate]

Hoping to scavenge the LCD from an old bathroom scale for another project, I took it apart. There were four sensors -- one in each 'foot' of the scale -- all wired to a small circuit board whose back ...
John's user avatar
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What might cause light vertical banding on LCD?

I'm troubleshooting a PCB which uses a STM32 to drive a large LCD. I have 2 versions. The new version has light green vertical banding on the display. The old one does not. I'm using the same display ...
Drew's user avatar
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PWM Low-pass filter for LCD contrast pin with a potentiometer?

As a software developer, electronic engineering isn't my strong suit, so I'm struggling to understand some simple concepts regarding this circuit. This is a unique circuit I have encountered that is ...
David Refoua's user avatar
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What might cause this strange pattern on an LCD monitor?

Recently my laptop has been showing a strange effect on its monitor: This is supposed to be a black screen, but the bottom fifth or so is affected by some kind of interference pattern. The pattern is ...
Rocketmagnet's user avatar
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Why does this LCD Bias Driver Have a Fault Mode?

I have a product that uses a TPS65150 LCD bias driver. I recently had an issue with a batch of boards, where this driver would go into fault mode (low on FDLY pin). The fault mode is triggered on a ...
Drew's user avatar
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How many steps of crystals rotation typical LCD display has for each pixel?

I just got a comprehensive response for brightness + contrast for LCD TVs in Brightness / contrast controls: what they do on LCD displays?. And realized that when RGB data is transmitted to LCD ...
Martian2020's user avatar
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1 answer
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Brightness / contrast controls: what do they do on LCD displays?

I was not able to find an answer via web search. AFAIK LCD displays can control brightness via changing brightness of backlight, in turn via electric current value (up/down). I don't recall reading ...
Martian2020's user avatar
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639 views

How does a boogie board/LCD writing tablet/ChLCD reset actually work?

there are those boogie boards, which essentially are just special LCD screens: ChLCD screens. which work by reflecting light on the places where it is activated. in a boogie board, the pressure causes ...
TeD van Loon's user avatar
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DC Offset in LCD clock signal

I am getting DC offset in clock signal. Clock signal has 24MHz frequency. The DC offset is around 400mV. Also I was expecting Square shape waveform but I am getting sinusoidal with DC offset. Clock is ...
Harish's user avatar
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3 votes
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Driving 1602 LCD in noisy environment

My PCB drives a 1602 LCD in 4-bit mode over a 0.5-1m long AWG28 (0.08mm2) ribbon cable. Sometimes I get nibble sync problems. It can be seen on the LCD as strange or garbage characters. This does not ...
Yohnsee's user avatar
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Internally connecting pins on microcontroller

I am working on generating passive LCD waveforms myself using a microcontroller, and am noticing that proper LCD driver hardware has only one set of resistor dividers for generating bias voltages and ...
Nolan Hergert's user avatar
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1 answer
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Achieving faster data transfer from a microcontroller to a display

The current fastest way of transferring data from a microcontroller to a display that I know of is by constructing the data in RAM and then sending it over to the display via parallel communication ...
ropeFullOfHope's user avatar
3 votes
1 answer
108 views

What Interface is my LCD display using?

My Tektronix TDS 2024's 5.7” STN display (320x200, color) needs replacing. Instead using the same expensive, hard-to-find, obsolete one, it would be a good opportunity to upgrade to a more modern ...
user148298's user avatar
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How is it possible to change RGB color filter panel to BGR color filter panel if the color filter is physically firmly mounted on the LCD display?

How is it possible to change RGB color filter panel to BGR color filter panel if the color filter is physically firmly mounted on the LCD display? TFT display design. Are RGB colors created only by ...
stm's user avatar
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How do two LCD segments get shorted together internally? What can cause that and is there any way to fix it once it happens?

I have a custom segmented LCD I took out of an old device that I'm now driving with an Arduino connected to LCD Driver AY0438. These are old custom displays so I don't have a datasheet or anything, I ...
SherEEf's user avatar
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Is it possible to re-use a 7 inches TFT Display on Raspberry-Pi? [duplicate]

I'm trying to re-use a display I recovered from an old digital photo frame as a display for a Raspberry Pi. The display is a TFT 7" LCD with backlight, but it comes with a 26-pin flat cable for ...
Grohlfer's user avatar
1 vote
2 answers
136 views

Help identifying this LCD [closed]

I disassembled a broken kitchen scale and I found this LCD module: https://imgur.com/a/8Uc3AHR The module has only 2 wires (A(node) and K(athode) printed on the board). I was wondering what kind of ...
Avok78's user avatar
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Have I configured the correct current supply for my TFT LCD Backlight?

I am currently working on a custom PCB which integrates a 3.5" TFT LCD. I am planning on driving the TFT backlight using a MIC4801 LED Driver and want to make sure I have configured the correct ...
henryv3's user avatar
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1 vote
2 answers
286 views

How is the LCD on STM32H735G-DK connected, and how can I turn it off?

The STM32H735G-DK Discovery board comes with an LCD. I wrote from scratch (no HAL) a simple blinky code, and it works well. However, the LCD is on (and backlit) by default, without any code from me ...
SRobertJames's user avatar
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LCD Display with FPC to Arduino

I’m very new. My game is push button, but it’s important that the display is transparent. I have this LCD screen. (data sheet) I was going to connect it to my uno using this PCB. But it didn’t fit ...
Supernew's user avatar
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What are LCD subpixels made of?

Just curious. I don't really need to know this level of granular detail for my job (AV technician) but in courses/articles about color LCD displays they explain everything... except what the red, ...
itsagift's user avatar
1 vote
1 answer
72 views

What type of LCD display is this?

I have an old alarm clock where the LCD broke down (powered by 2xAA batteries) The LCD is transparent, and can only show 4 7-segment characters, plus some indications such as dividing ':', alarm on ...
Arvest's user avatar
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