Questions tagged [display]

Questions about LCDs, 7-segment LEDs, E-ink displays, etc.

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61
votes
3answers
8k views

How does my screen driver handle so much data?

I just did some quick calculations: On my MacBook I have a resolution of 2560x1440 multiplied by 24 Bit for colors we get 11.05MB for a single picture or 663MB per second at 60 fps. I guess there is ...
26
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3answers
1k views

What is this unusual LCD controller technology?

Preface: Even if you do not have a definite answer, I would greatly like feedback from anyone who has even seen an LCD using this technology. I recently took apart a Canon digital camera from the ...
14
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3answers
8k views

Why does “flashing” prevent ghosting on E-Ink displays?

Anybody who owns an E-Ink device (like a Kindle) will be familiar with the phenomenon of "flashing" -- basically, when turning a page, the device will first flip all of the pixels to black, then draw ...
13
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1answer
2k views

What is this type of flexible contact strip called?

The LCD below is from a cheap digital clock which was (obviously) damaged (broken glass). The electrical connection between the PCB and the display was realized with this pink strip. Its flexible... ...
12
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2answers
3k views

Why are OLEDs used in screens insted of LEDs?

I was trying to google this question and couldn't find any information. And from reading some info on how they work i didn't find any significant difference asides from OLEDs being made out of organic ...
12
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3answers
5k views

Low power, seven segment display

I want to display a 4 digit number on a small device that fits in a hand. I have a CR2032 3V battery at around 230mA, my microprocessor is a 8051 (in a BLE112) usually uses about 0.9µA and I want the ...
12
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2answers
8k views

How electronic price tag works?

Today I was in Tesco in my city and I saw something quite interesting, that was electronic price tag: I don't know how it happend, but on a parking I found this price tag in my basket beneath some ...
11
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3answers
8k views

Implementing a very high frame rate (~1Khz) OLED display

I'm interested in developing a very high frame rate OLED display capable of displaying ~1000fps with a resolution of around 1200x800 or so. This obviously has some pretty severe bandwidth requirements,...
10
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2answers
335 views

Ghosting in VGA signal generation

So, I'm generating a 1280x1024 (native screen resolution) VGA signal using a Lattice HX8K > Yosys, according to these timings, and a PLL of 107.812Mhz of Pixel Frequency. I then pass it through a ...
9
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4answers
2k views

Understanding memory requirements for an image file

I want to understand the memory requirements for image resource files to be displayed on a 240x400 resolution display. The display has the following specs: It supports upto 18 bits color depth and ...
9
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4answers
623 views

Create multi touch display for full light

We have been given a project at uni to create a multi touch display. I've done some research into this and a lot of them call for special film on the glass or use a projector (meaning it needs a ...
9
votes
1answer
757 views

Justification of the choice of colours in monochrome displays

Why for monochrome displays was chosen green, gray or yellow(amber) colors? Any reason like red LEDs because it simpler in production. upd: Amber for reducing eye strain. Gray for white imitation. ...
9
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1answer
4k views

Easily controlled color LCD for hobby projects?

I'm looking for some not too expensive, easy to control color graphics LCD I can use for various hobby projects, along with an AVR microcontroller or maybe an ARM in the future. The cheaper the better,...
8
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4answers
30k views

LVDS vs MIPI, what's the difference?

What are the practical differences between LVDS and MIPI? A little background information: I am attempting to build my own projector on the cheap and want to use a nexus 10 LCD panel (2560 X 1600 ...
8
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3answers
2k views

What is this type of digits-only LCD called?

I've seen this type of LCD many times in weigh scales, calculators, gauges, micrometers, etc. I know it's a fairly traditional display but I really like its compactness, simplicity, and maybe it even ...
8
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2answers
13k views

How to deal with unicode characters with character LCD displays?

I would like to buy an LCD screen fom Arduino to display some results from a web http call; the Web API returns a JSON text encoded in UTF-8. I've read that ICU is the way to go to handle Unicode in ...
7
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1answer
699 views

What kind of display is this?

While investigating analog technologies I discovered these images of a quadraphonic 8-track player. All 8-track players I've seen before use analog voltmeters as displays rather than square graphical ...
7
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2answers
3k views

How does E-Ink Work?

Can someone explain how this really works? I don't understand those bubbles, and how you get different colors on this type of screen, or it is only black&white, does it works similar to ...
7
votes
1answer
9k views

How exactly does a VGA cable work?

I've been looking around on the internet and I can't find anything in depth on how the cable/connection functions. I've only been able to find simple pin out descriptions. If someone can link me or ...
7
votes
2answers
821 views

What is the purpose of diodes in flip-dot displays?

In most flip-dot displays i've seen, the electromagnets have a set of two diodes connected to them. This is also mentioned by David, who asked a question about the displays before. However, in the ...
7
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1answer
609 views

How to analyze a display?

So while walking around school today I found a neat little piece of hardware thrown in the trash. After a quick overlook, I noticed that the display was one of those 32 segment kinds (like a speak and ...
7
votes
4answers
4k views

Why do most PWM LED displays and backlights operate at a relatively low frequency?

All around me are a bunch of electronics: digital clocks, my laptop, a refrigerator, a dimmable flashlight, and more. What they all have is perceptible flickering of their displays due to PWM, ...
6
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7answers
3k views

Multi-channel bar graph LED drivers

I want to build a circuit that shows the real-time frequency components of an audio signal on a number of bar graphs of some sort. Currently, my plan is to build 12 band-pass op-amp filters, and then ...
6
votes
3answers
28k views

How to build a POV display?

I've recently gotten the itch to build a POV Display. I'm wanting to build the sort that rotates "vertically" (like a fan or bicycle rim) and I'm finding very little information on how to actually do ...
6
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2answers
3k views

7-segment LED display with multiple digits

I was looking at the datasheet for the LTC-4627JR, and it looks like each digit shares a common anode, and each segment shares a common cathode. My question is given this configuration, I don't ...
6
votes
1answer
546 views

LCD driver: What changes in 3-D mode?

Facts: We know that a system needs high data transfer speed if it works with +120 Hz refresh rate and +1080p resolution(This mostly requires DVI dual link). We know that in a 3-D system with shutter, ...
6
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1answer
2k 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 ...
6
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3answers
3k views

Is this a common LCD display? [closed]

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 ...
6
votes
1answer
1k views

Gumstix with an e-ink screen

I really want to develop on a gumstix with an e-ink display, but $3000 for a development board is a bit steep for me right now, especially since I just want to get a prototype out so I can see what ...
6
votes
2answers
2k views

Is my LCD TV doing some sort of dithering? [closed]

I'm using a 32" 'LED' TV as a monitor (1920x1080 over HDMI). I've been noticing some annoying horizontal stripes where the source is displaying grey pixels. It seems that what's happening is the TV ...
5
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5answers
10k views

Multiplexing two 7-Segment displays (Ghosting issues)

I am currently working on a simple scoreboard using two 7 segment displays, a shift register (74HC595N), two PNP transistors (2N3906) and an arduino uno. Each 7 segment display is common anode, ...
5
votes
5answers
37k views

Displaying a 2-digit integer on two 7-segment display

I'm having trouble displaying a binary number into a display. I'm not sure of how to split a number in binary into its individual numbers. For example, if I want to display 25, I want to split this ...
5
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4answers
2k views

Source a really big LCD character display

I'm looking around for a large LCD character display (metre-ish long, 10-15cm high), and on the cheap side (of course) Any suggestions? Actually I think I meant LED display, max $150ish
5
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3answers
11k views

Is it possible to wire up a cellphone screen to work with a different device?

I'm trying to find out if it is possible to send video to a cell phone screen (just the screen, not the phone) like this one from something like a video-mp3 player or even from maybe a mac-mini, or ...
5
votes
2answers
3k views

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 ...
5
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2answers
220 views

What does 'cathode-row' mean?

"The MAX6960–MAX6963 are compact cathode-row display drivers" What does cathode-row mean?
5
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5answers
3k views

Video overlay / on screen display architecture

I want to take a NTSC/PAL component video and overlay graphics over it. I am aware of solutions that either use the max7456 overlay chip, or accomplish it with just an AVR but these seem to have ...
5
votes
1answer
1k views

Segment display – Why selecting segment by GND

I bought display and for my surprise it works same as display i already had. I must chose segment i want to light up by GND and not by output pin on my Arduino. Is it normal or there is something ...
5
votes
1answer
338 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 ...
5
votes
1answer
837 views

I2C device doesn't sink enough current

Im working on a display project and have run into some I2C issues. The display is of 3.3V design, so I figured, no big deal, ill use a level shifter and be on my merry way. Well, sure enough the level ...
4
votes
3answers
1k views

Why does this 7-Segment Display not function properly?

I've provided details in image. Although, I'll once again provide in text: IC : 74LS47N (Binary to 7-Seg Display) 7 Segment : Common Anode M.S.B : D L.S.B : A This ...
4
votes
6answers
3k views

Graphical equivalent to HD44780 LCD controller

The Hitachi HD44780 LCD controller is an extremely common character-mode LCD controller. Though I believe it is now discontinued, compatible controllers are used in many hobbyist and commercial grade ...
4
votes
3answers
709 views

How to safely insulate the Power PCB of a display computer monitor?

CONTEXT The other day I was checking the heat coming off an aluminium heatsink on the power PCB of an eizo EV line led display monitor. It was okay, not too hot, just warm and tad bit hot. When I ...
4
votes
4answers
15k views

SSD1306 Display SPI Connection or I2C (According to resistors)

I bought one of those cheap 0.96" OLED Displays from china, ebay. In the product description it states that it's a I2C Display, Ebay Link. I want to use it with an ATmega8. I connected it accordingly ...
4
votes
2answers
4k views

How large is “one pixel” for S5 AMOLED display?

Referring to Samsung Galaxy S5 OLED Pixel structure in oled-display.net, in particular this image illustrates the S5 AMOLED pixels: To my understanding, the yellow rectangle should represent "one ...
4
votes
1answer
958 views

What is the real amount of reproducible colors on CRT display?

Let's say, a generic consumer-level CRT. How much colors can it reproduce?
4
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1answer
2k views

7-segment gas discharge display - segments are not lit up completely

I'm currently trying to revive an old (as in 30 years) panel meter (a Weston 1234). I was able to re-calibrate it again, but I'm facing a problem with its display. The display consists of two parts, ...
4
votes
1answer
108 views

Is it possible to make a multi-display adapter as an independent project?

I've been looking at the Matrox DualHead2Go, which is essentially the best/easiest way to go about using dual monitors for a MacBook Pro. Some people suggest using a USB to VGA or HDMI - but obviously ...
4
votes
1answer
540 views

How are DACs integrated in color LCD screens?

I'm having trouble imagining what actually happens inside an LCD screen. I picture digital RGB data for each pixel getting sent to the screen through a connector. Lets say we have 24-bit color for ...
4
votes
2answers
168 views

Self Contained Temperature Display in Very High Temp Environment

I want to build a temperature sensor + display that will operate in a high temperature environment (routinely 120C, but periodically spiking to 175C, and might be exposed to 350C where it would be ...

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