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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407 views

MM5452 with 4 digit parallel 7-segment LCD display

I have a question regarding the backplane connection for the MM5452. From this data sheet: MM5452/MM5453 Liquid Crystal Display Drivers It says that the backplane pins on the MM5452 connects to a ...
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5k views

SPI device prevents ISP programming

I have an ATmega8 with a Nokia LCD 5510 connected to it. Everything works great on a breadboard and my next step is to move it to a more permanent board. My problem is that I can't program the ATmega8 ...
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384 views

A good TFT LCD for a project [closed]

I am starting a project and I need a colour screen preferably clear to shuffle through images (think of it as the digital photo frames). However, I need something bigger than the usual screens, maybe ...
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1answer
339 views

Is it safe to unplug power, from a working LCD monitor?

I've built a system using a pressure sensor on my chair, which in-turn controls a switching-relay such that when I get up from this chair, power to all my LCD screens is switched-off by the relays, ...
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3answers
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PIC : Problem with LCD Initialization

As we are developing our application based on the PIC18F66K22. We need to interface LCD with it. We have the LCD working with it but the problem that we are getting is that the LCD initialization ...
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3answers
595 views

Can anyone identify this LCD Display

How do I go about identifying an LCD display module so I can get a data sheet? 16 Pins to one side in 2 rows of 8. printed on PCB: hy-211 printed on PCB: v0022201 rev.b printed on a sticker on side:...
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1answer
132k views

Differences between OLED, LED, LCD, and TFT Screens

I have heard about these different types of screens on DIY websites and in consumer electronics. What are the differences in these types of screens and what are their advantages and disadvantages?
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ILI9163C : LCD showing garbage after initialization

I am using a LCD having ILI9163C as LCD controller with pic18f66k22 with 8-bit parallel data interface. The problem that I am getting is that after initializing the LCD it shows the garbage instead of ...
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1answer
215 views

How Are Pixels Sent To The Screen?

So, today I started to wounder how pixels are stored, then push though the graphical bus. I have not really done much with LCD or touch screens. I do know from my programming background they are ...
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Is this a common LCD display?

I'd like to know if this LCD display is a common one like the HD44780. Sadly there is no model number on it, only the brand(?) "onv" or maybe it should be "auo" when you read it upside down. It's part ...
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0answers
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16 x 2 LCD not displaying analog inputs fed to ATmega168

I am experiencing some problems getting a display of analog inputs(current and voltage) fed to ATmega168's A0 and A1 respectively. I believe the wiring and the program are correct since the same ...
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2answers
466 views

Getting rid of ripple from an LCD backlight

I have built a circuit which contains an integrated power supply stepping down mains voltage to 5v through a transformer, rectifier circuit and a voltage regulator. With a couple of smoothing caps the ...
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1answer
1k views

DFRobot LCD shield minimum pin connections

I am connecting a DFRobot LCD shield (http://www.dfrobot.com/index.php?route=product/product&product_id=51#.UYWE0itxsVk) to a bareduino. There will be no shield placed on top of the LCD and am ...
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1answer
4k views

MPLAB XC8 vs MikroC problem

I have been trying to write a program for LCD on PIC18f452. I found a library and worked on it and MPLAB XC8 compiled it successfully. I tested it in ISIS and it ...
5
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1answer
13k views

TFT LCD interface with a Microcontroller: Getting Started

I have a small 3.5 in TFT LCD display from a Chinese manufacturer. It doesn't have an integrated LCD controller. The documentation claims it is a "16 bit RGB/parallel interface" and it uses a Renesas ...
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3answers
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TFT LCD pixel clock filtering

I would like to know how to filter the pixel clock in order to reduce emitted radiations. Block diagram The LCD controller is part of a motherboard. A board, connected at the other side of the FFC ...
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1answer
3k views

HDMI/VGA/NTSC/PAL to 24-bit parallel RGB interface [closed]

Adafruit.com is selling TFT-LCD modules that comes with an NTSC/PAL driver board. The product specification page includes a link to the original manufacturer´s datasheet/specifications for the TFT ...
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2answers
739 views

Interfacing a 16x2 Character LCD to the Arduino

A friend recently gave me a set of three (old) 16x2 LCD displays. (datasheet) However, I'm having difficulty thinking through how to connect one to my Arduino. Particularly, each LCD has 14 (!) ...
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1answer
123 views

How to flash error if a macro is not defined in program

I want my program to flash compile time error like "LCD_PORT not defined" if it is not defined in program itself. For that I modified the header file like this ...
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1answer
867 views

24-bit parallel TFT module on circuit designed for 16-bit parallel

I've designed a circuit that connects a 16-bit parallel LCD TFT module to the SPI-connector on a RPi, but bigger TFT modules often have 24-bit parallel. Can I use a 24-bit parallel TFT with my circuit ...
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4answers
707 views

Do graphical/pixel mapped LCDs need a screensaver?

Will displaying the same for a very long time on a graphical or pixel mapped LCD harm the display in any way? If so, what would be a maximum time to display the same, or how could I determine that ...
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1answer
588 views

A small, thin LCD for my device [closed]

I've been looking for a good display for the handheld device that I'm building and I've liked the various HD44780-based displays that I've tried. (like for example this one: https://www.sparkfun.com/...
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1answer
425 views

What makes a display visible in daylight (such as the Pixel Qi)?

What characteristics of the Pixel Qi display make it visible under daylight conditions? It seems to have something to do with "daylight grayscale". But what exactly does "daylight grayscale" mean? ...
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1answer
4k views

Can I use a voltage divider circuit instead of a level shifter here?

I am trying to hook up an LCD module to my microcontroller, and was following this tutorial. Notice that the three signal wires all go through a level shifter, which drops the voltage from 5V to the ...
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0answers
948 views

OLED Custom Character not being displayed correctly on Arduino Uno? Too Many?

So I have a bunch of custom characters and they are created like this ...
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1answer
132 views

Simplest device for mini operating system

I have been developing an operating system off of this video and I want to begin building a device to support this os. All it really does is print to the screen. I want to build a small device with an ...
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2answers
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PIC16F877A (with LCD) not working

I have designed a PIC18F877A micro controller project to read temperature from an LM35 using ADC, display it on an LCD and transmit it to a serial port. When the program starts, sometimes it shows a ...
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2answers
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Applescript to Arduino LCD only works with Serial Monitor

I spent all day trying to figure this out and finally got somewhere that atleast lets me know that I am doing something weird... I am trying to send data to my LCD Screen on my Arduino Uno, but for ...
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1answer
921 views

Using touchscreen cellphone lcd module for custom projects

I intend to use the capacitive touch based lcd modules of cellphones in custom embedded projects, I will be using this display with low cost stm32 boards. Has anybody experimented with this approach ?...
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1answer
664 views

Voltage Level Translation: LCD(5V) -> GTL2000 <-> MCU (3.3V)

I am trying to interface a micro-controller (LPC11C14) to a LCD. The LCD has Vih = 3.5V so I cannot directly connect the uC pin to the LCD. For this, I found a GTL2000 chip which looks like it might ...
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2answers
938 views

Arduino 3 digit LCD calculator

We would like to build a calculator using Arduino which uses 3 digit LCD and a keypad similar to digital phones. (# for plus , * for minus) Which components and way is good enough to not to run out of ...
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1answer
1k views

Monochrome LCD sources [closed]

I'm planning on doing a one-off project that will need a monochrome LCD 3-4 inches wide. Unfortunately, I haven't had much luck finding what I need. Smaller screens like those salvaged from cell ...
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2answers
754 views

7 segment LCD works on breadboard, not on stripboard

I am using a 7 segment 3 1/2 digits "raw" LCD (like this one) using 4 CD4543 controllers and a MSP430. I use one of MSP430's pins to create a 30Hz square wave that I feed into CD4543's phase input. ...
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2answers
281 views

Best practicce to refresh data on LCD

I am currently reading value from ADC and displaying on LCD screen. The ADC is supported by DMA. Now my system has 5 menus seen on LCD (Voltage, Current, Resistance, Settings). 3 of them should ...
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2answers
1k views

How to address a 16 bit LCD using 8 bit bus?

I need such a TFT with SSD1289 controller, but with 8 bit bus. Does anyone know how to modify it?
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2answers
422 views

LCD Multiplexing: Segment Off Voltages

I am reverse engineering a LCD (this is a raw bit of glass, i.e. no controller) and trying to understand the signals... there are 16 lines of which 4 are backplanes and 12 are segment lines. The ...
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1answer
497 views

Hantronix 20x2 LCD backlight

I recently got a big box of Hantronix 20x2 LCD from a friend. They appear to be the negative type, where the 'on' pixels appear as clear and the off are opaque. When he gave them to me he told me that ...
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3answers
842 views

Freetronics LCD pins all used up

I am new to electronics and recently bought Freetronics Arduino experiment kit with the Freetronic LCD shield with keypad. I have installed the LCD shield and now I realize I no longer have any pins ...
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2answers
3k views

Reverse engineering a 12 pin LCD?

I just found a broken "laser projecting alarm clock". I took it apart, and am interested in only the laser projection arm. This consists of a laser diode (although I suspect that this is actually just ...
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2answers
2k views

16x4 LCD not displaying anything

I am trying to interface a 16x4 LCD with an atmega32 chip. I wrote the following code which used to work for 16x2 LCD ...
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1answer
2k views

Diagnosing LCD backlight inverter problem

I am having problems diagnosing the error with a notebook LCD display inverter. Symptoms: After switching the notebook on, the LCD backlight comes on but the intensity oscillates rapidly (flickers). ...
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1answer
246 views

free drawing on a touch screen, interacting with physical objects [closed]

I am an hobbyist and having a plan to create my own drawing tablet, and still making ideas, I want to combine physical world with this thing, an idea that I have is that I want line that I draw with ...
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1answer
261 views

Using LCD module with poor / missing datasheet

I've got an NMTB-F000393FGHSAY-A 2-row character LCD display module, which I'd like to use in a project. It's got 18 pins in a 2x9 configuration on the back. I pulled it out of an existing (broken) ...
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1answer
2k views

How to shift cursor of a ST7032i based LCD?

I am using a MIDAS MCCOG21605B6W, I2C interfaced, COG type LCD. I am also using a PIC16F616 microcontroller to interface it and I am bit-banging the I2C protocol. I can initialize the LCD, write to ...
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2answers
1k views

Character (HD44780 based) LCD backlight is always on

I have a Solomon LM1112SYL 4x16 LCD. The display has 16 pins and the datasheet (http://www.allelectronics.com/mas_assets/spec/LCD-108.pdf) shows that pins 15 & 16 are for the backlight power ...
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2answers
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Name and reason for space between pixels on an LCD display

Hopefully this is a good place for this question... I figured it was too technical for the A/V board of StackExchange. Question: Simply put, a recent conversation brought up the issue of the name of ...
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1answer
107 views

LCD contrast - is there a way to control the variation in contrast during production of a consumer product?

I'm working on a product with a vendor/factory and they've sourced two difference LCD's. One has a darker contrast. We chose the one with the darker contrast because it is easier to read. However, ...
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1answer
1k views

LCD modules with I2C or SPI interface [closed]

I would like to add an LCD to my current design (a project that is to be produced in low volume, around 50 to 100 units). A small display size (around 8 or 16 characters) should be plenty since it is ...
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2answers
273 views

Interface a LCD to RS232

Is it possible to connect this LCD display. Directly to the PC serial port using a prolific usb 2 serial converter ?
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2answers
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Why do displays with auto-synchronization function get out of sync? (pixels blur) [closed]

I'd like to know why LCD displays that have the "Auto" button need it in the first place. Are they losing sync with the signal because of some special feature or all LCD displays really suffer from ...