Questions tagged [display]

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

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3answers
572 views

Why do LCD screens need to refresh in the first place?

I understand how screens display something; essentially by refreshing very fast so that any changes are quickly visible. However, to me, this seems like a very inefficient way to solve the problem. ...
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2answers
62 views

PAL Video - Horizontal Color Pixels

I've created an 8-bit VGA controller that outputs a 400x300 RGB signal. I also want to implement an AV output using PAL encoding. I don't understand how I can achieve the same resolution since the ...
0
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0answers
40 views

Program CMF-TG2201DBCW display with unknown datasheet

I found a display on a broken printer machine and I want to know if the display is working but I can't find any data about that type of display(I found on Ebay the exact same display but the seller ...
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1answer
30 views

TFT display wiring on Sparkfun Pro Micro

Please help me configure the wiring for this TFT display. I’ve tried using the Waveshare TFT display with both the Sparkfun Pro Micro and the Raspberry Pico but had very little success. Only the ...
0
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0answers
12 views

The datasheet of TRI-T D22-5002 C6 display screen

does anyone have any idea on where I can find the data sheet of the D22-5002 C6 display screen? It has 22 pins on 2 opposite sides (11 on each). I searched everywhere but I can't find it. I have the ...
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0answers
31 views

Non white lines on 1920x180 LVDS controlled TFT

We are integrating a LVDS 27" 1920x1080 panel with a commercial DVI to LVDS controller board. We have a PC, that has a DVI output, and we connect it to the Video controller. The video controller ...
0
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1answer
43 views

Understanding image display on a TFT/LCD display

I am doing some reading about interfacing displays with an MCU. I came across this block diagram: About the display controller, the following is mentioned: The display controller is continuously “...
1
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0answers
47 views

Overvoltage shut down

A LCD display controller includes a 5 times DCDC converter. A circuit is needed to ensure that the in case of a fault in the display the 5 times voltage can not return to the CPU circuit in anyway. ...
1
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2answers
128 views

What refresh rate do digital stopwatches use?

We've all probably come across these kinds of electronic stopwatches at some point: They almost always claim to count centiseconds (although this one counts in milliseconds), but do they really have ...
0
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1answer
39 views

Can I use unregulated power supply for LCD display backlight LED?

I am designing a PCB for a university project that will include an LCD display which is powered by 3.3VDC regulated supply. Unfortunately this display has backlight LEDs in series that have total ...
0
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2answers
44 views

Inappropriate readings of pulse and temperature sensor (LM35)

I am facing quite a bit trouble with an LM25 temperature sensor. The readings are a bit too high (90-120*C) for room temprature. I have tried thefollowing things to get an expected result but none ...
3
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1answer
76 views

1980s AVTEL 4 colour mechanical display, how is the pixel state reset?

I stumbled on a retro Dutch video from 1983 where a large four color mechanical display is shown. Each pixel consists of a cube which can be turned in order to change the pixel color between 4 colors (...
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0answers
38 views

What is the infrared controller in Nook Simple touch?

I got an old Nook Simple Touch from my brother and it worked before. But it has been covered with mold so I removed the plastic case and it still boots, but cannot respond to any of my touch. I found ...
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1answer
17 views

GMSL Deserializer to LCD Link Rate

I need to calculate the Link Rate for my GMSL Deserializer which is connected to a 800 * 480 TFT Display. In that case, I stumbled upon this Article On the last few lines, they are asking to multiply ...
0
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1answer
38 views

What are the display parameters for a TFT LCD?

I want to use this display with a system on module running Linux. I need to configure the device tree below with the parameters for the display so it will work properly. A description of these ...
0
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1answer
33 views

How to adjust both brightness and contrast of a TFT LCD display

I am developing an HMI using the display "S039QWQ01HS" and I have the requirement to provide control to adjust the brightness and contrast of it. For the brightness control, I have already ...
0
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0answers
20 views

MIPI DSI-2 contrast control and buffers for 3d printing

I've got a 3d printer, and it uses a mipi-2 DSI LCD. The display is driven via an HDMI to MIPI adapter board. Unfortunately, HDMI does not contain ways to adjust display contrast, and the adapter ...
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0answers
20 views

does the order at which HDMI differential signals should be connected matter?

I have 8 DDI (Digital Display Interface) signals that come out of the CPU with a certain numbering from 0 to 3. I want to connect these signals to HDMI connector. I was wondering if there is an ...
0
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0answers
68 views

Help with SPI routing for a display

I’m designing my first PCB and got weird SPI issues after my second revision of the PCB layout. I did a few small changes for the SPI routing in the second revision but nothing that I thought would ...
0
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1answer
79 views

How to turn off and turn on LCD 16*2 display?

I build a device in which I check data on LCD display 1 or 2 times a day. So when I tried to turn off my 16*2 display and re-plugin in the middle of running the machine it gives some garbage value. ...
0
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1answer
55 views

STM32H743 FMC with ST7789 doesn't work without delay

I have an STM32H743 connected to a screen that uses ST7789 via FMC (i.e. parallel connection) using 8-bit bandwidth and A18 to select between command and data. The current code has an issue that the ...
0
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0answers
66 views

LUT from OTP vs LUT from register on e-paper displays

What is the meaning of LUT from OTP and LUT from register on e-paper display convention?How could we program the e-paper display using LUT from register? I'm working on GDEW0213T5D e-paper which uses ...
0
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0answers
41 views

LCD backlight current consumption

I am designing a power supply adapter for a 7" LCD PH720128T003-ZBC02. The main voltage is 3.3V. This is enough for the internal logic regulator (VDD) and analog circuit (VCI) but not for the ...
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0answers
45 views

E-paper display working problem- UC8151D driver

I'm working on e-paper display GDEW0213T5-D product which including UC8151D IC driver.I can communicate with e-paper with SPI interface however there are problems with showing correct things(e.g. ...
0
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1answer
23 views

What are the main parameters to check display with display controller

I have MAX9278 deserializer IC which is connected to a 3.1inch TFT display 800 (W) * 480 (H). Deserializer provides 4 LVDS lanes and 1 clock to the display. What are the major parameters that I need ...
0
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1answer
52 views

LCD clears itself when potentiometer contrast is too low

I'm making a project that requires an LCD, and the project was working fine on my breadboard for testing. I moved it to my final product, but now my LCD stops displaying text after a few minutes, or ...
0
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1answer
35 views

Extension from OLED display to driver board

I have purchased this display for a prototype in development. Product: https://www.displaymodule.com/collections/oled/products/2-8-256x64-monochrome-graphic-oled-display-module-spi-mpu Datasheet: ...
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2answers
64 views

Examples of using a circular polarizer filter for LED display

I was looking for ways to increase the contrast of a LED-based seven-segment display like this against indoor ambient light, and found this comment on EEVblog suggesting using circular polarizing ...
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0answers
31 views

Problems with STM32F746G-Discovery using another display

I encountered a problem during the configuration of a STM32F746G-DISCO Board for the use with another display. Initial situation: I unsoldered the connection between the STM32F7 Board and the default ...
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2answers
61 views

Is the phantom touch issue present in resistive touch screens?

Do phantom touches (ghost touches) occur in resistive touch screens, or are they only present in capacitive touch screen displays?
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1answer
130 views

Nextion Display not updating data from Arduino

I am using an Arduino Mega to display the readings of 4 pots on a Nextion Display as well as store it in an SD Card with the time stamp. I keep getting recvRetCommandFinished err on the serial ...
0
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0answers
30 views

Timing diagram question of an EL-display

I am having a hard time interpreting this timing diagram of a Planar electroluminescent display; datasheet: Planar EL320.256-F6 pages 10-11 in the browser pdf viewer. If i read this correctly, it ...
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0answers
52 views

MIPI display driver qualcomm APQ8909W

We are tring to brinup a new display for a Qualcomm APQ8909W chip that's running Android 8.1. From looking at the kernel log during boot I can’t seem to see what display driver is being used/...
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2answers
48 views

What's the best way to dim a 5-inch LCD for a Raspberry Pi?

I'm trying to make a DPI display to work with my Raspberry Pi. First, I searched around and found out that the 555 timer IC is a good way to control the brightness of the display. Since the background ...
0
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0answers
22 views

OLED 128 x 32 SYO12832B01 display problem

I am using a SYO12832B01 I²C OLED display with driver SSD1306. Here I am attaching the my initialization code. I got the correct data in the display, but the issue is I can't enable the internal ...
0
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0answers
26 views

LCD panel power supply

I'm looking at using a LCD panel (Chimei Innolux HJ0801A-01E) that is exactly the right physical size and resolution for a project - I'll drive it with a FPGA; I have looked for a while and I don't ...
0
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1answer
89 views

RGB 24-bit resolution on 12-bit DAC

I am looking to pass my 24-bit RGB color value through a DAC, but my resolution of the DAC is 12-bits. Would I have to reduce the resolution of each channel to fit it on my 12-bit DAC? Is there a way ...
0
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1answer
64 views

What is difference in link rate and pixel rate in Display Port

I was going through the Display port Specification. I came across below para "1.7.1 Make-up of the Main Link The Main Link consists of one, two or four AC-coupled, doubly terminated differential ...
0
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1answer
64 views

STM32F769I display not showing framebuffer content

I am trying to get video to work on STM32F769I device. What I have done already is that I have changed the device tree so it has the required support and enabled the kernel features required for it to ...
1
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0answers
14 views

Are eDP driver boards compatible between resolutions?

I'm looking at various eDP to HDMI controller boards that are available. The ones that I've found identify a very specific resolution: 1920x1080 or 1366x768, etc. If I buy a controller board for ...
4
votes
1answer
501 views

Convert from VGA 9 pin to RCA (manually - old machine) [closed]

I'm in a trouble. Can someone help me? I have a very big machine where I had mounted an IBM 5151 monitor by VGA. The VGA cable was connected to the card below (see attachment), by 4 wires. Now the ...
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0answers
73 views

WEMOS D1 12V power source

In my project I am using WeMos D1 R1 to which I have connected I2C display 1602A , infrared LED (for remote control) and DHT11. As display and sensors are working on 5V I am using voltage level ...
0
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0answers
35 views

Pass bandwidth of backing light for LCD display

A stardard industry LCD display is composed of several parts. Polarizer film and color filters produce and image by masking the light from a source positioned behind the LCD itself, the so called ...
0
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1answer
66 views

What display is used in remote control

I'm making a device which requires a display, and the display I want is similar to what goes into remote control of air conditioners. What are these kind of displays, and how do they have some special ...
2
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1answer
228 views

Are all pixels addressed simultaneously in one frame?

In computer screens, is every pixel turned on during one frame? How can you address millions of pixels at the same time? Or is it like in CRT where it is scanned left to right, top to bottom?
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1answer
50 views

No display at all tests, but shows continuity [closed]

My multimeter buzzer is ok and sounds when continuity is checked. However, no display on the LCD. Also, no numbers are showing in every tests voltage, resistance, etc. I have replaced the battery and ...
1
vote
3answers
214 views

Why do displays have limited bit-depth?

As far as I am aware, HDMI 2.1 does support 12-bit 4K 60fps, Also it doesn't use TMDS, rather FRL. Sends upto 48Gbps GPUs can do calculation in fp32 and from some reference, I think that it can send ...
0
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0answers
43 views

SSD1351 Display showing random bars across the screen

I recently bought this Display and wanted to use it with an ESP-WROOM-32. After some problems I got it to work using this schematic and the Adafruit SSD1351 library. (I connected the 13V of the ...
1
vote
1answer
90 views

Microcontroller and design for multiple displays

at my day job I'm an application level developer, but I have an idea that I would like to prototype thats a bit more on the microcontroller side. Basically I want to be be able to display some static ...
0
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1answer
125 views

Minimum wiring for remote ST7735R SPI TFT display

Figure 1. ST7735R 1.8" TFT colour LCD. Image source: eBay. I have an ST7735R working on an Arduino Nano as shown below. Figure 2. Current setup. I want to try mounting the display remotely (< ...

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