lcd displays random characters made in china

My LCD is showing random characters, see the picture below (the last character blinks, some characters change and over time there are slowly more and more characters). I"m starting to wonder if the LCD I chose has a driver compatible with the LiquidCrystal library, what do you think? If so what can I do to avoid buying another one?

"m using a jhd 162A blue 16x2 display. when i display a msg in english it is displaying it in some random characters, whereas the numbers are shown correctly. when i change the lcd and put a jhd 162a green/yellow display the english characters are shown correctly. where is the problem? should the blue lcd be programmed differently?

I"m working on a project whose objective is to control two ac loads (one ac fan, controlled by phase angle control and one ac motor controlled by a 5V relay) and output to an LCD the room temperature and the % of fan speed.

First, I put the lcd.clear() function in my code to "rebuild" the info from time to time but it doesen"t work 100% and it"s not a "clean" solution for the pourpose.

i"m very young in the world of Arduino and i"m having a serious problem with the LCD QC2004A and Arduino Mega because whatever i write in alphanumeric, is translated to chinese language and i really don"t know what to do to change it.

Monochrome lcd panel is low cost LCD screen, monochrome lcd display is the mainstream in custom lcd screen because its custom tooling fee is very cheap.Monochrome LCD display included standard graphic monochrome lcd display, character lcd module, monochrome segment lcd display, monochrome tft lcd module and custom lcd screen.The monochrome lcd screen structures have COG LCD (chip on lcd glass), COB (chip on board), COF (chip on film).

An seven segment lcd display is like the below picture, it can display numbers from 0 to 9 and several letters such as C, A, b E, L, and F by control some segments "on" and "off". it is the cheapest lcd display panel.

The segment lcd also could be in Icon lcd display, that is the display content are the custom segments based on customer"s application.each segment means one icon, we could design the icon on our application.

The familiar Characters lcd modules have 16x1, 16x2, 16x4 characters, 20x1, 20x2, 20x4 characters, and 40x2, 40x4 etc, characters lcd display module. An 16x2 lcd display means 16 characters x 2 lines character on the lcd. normally, one characters is made by 5x8 pixels, we could display numbers 1~9, and A~Z letters and most of characters on the 5x8 pixels per characters.

The standard graphic lcd resolution have 96x64、96x96、122x32、128x64、128x128、160x128、160x160、192x64、240x64、240x128、320x240 etc.we could display all the characters and image in the graphic lcd display. of course, the higher resolution lcd, the display effect of image would be better.

(What is lcd resolution: )Lcd resolution means how many pixels of lcd screen,128x64 lcd resolution means 128 column x 64 row pixels on the lcd screen, we also call it 128x64 lcd display. monochrome lcd resolution could be 320x240 (QVGA) or 480x240 maximum, tft lcd resolution could be VGA (640X480) or HD (1366x768, FHD(1920x1080) or 4k2k lcd resolution.

Yes, if you only need the low quantity monochrome lcd display for your project, you could choose Maclight standard monochrome lcd, Maclight have wide range standard Characters lcd and Graphic lcd module, including COB type and COG type for your choosing. please find the standard monochrome list in the end of article, welcome to contact Maclight at [email protected]

The tooling fee of monochrome lcd panel would be around 300~500 USD, if only the simple segment lcd panel, such as TN display mode, then tooling fee would be cheaper, but if the custom lcd screen is monochrome graphic lcd panel, such as STN display panel, the tooling fee would be little higher than TN lcd panel. because the tooling mask for stn lcd would be higher than TN lcd panel. but it is only the tooling fee for monochrome lcd panel.

If for custom monochrome lcd module that with IC chip on glass, we call it COG LCD module, the tooling fee would be more higher, because if for custom TN or STN lcd display panel, the tooling mask can be made by PI film, while for custom monochrome COG LCD module, the custom COG LCD tooling mask would be used the metal mask, the tooling fee would be more higher to around 1500~2000 USD.

Besides the custom lcds panel, for some custom lcd mode that in transmissive lcd or transflective lcd display mode, because lcd panel is passive display, instead of oled display, lcd panel can not emit light by itself, it have to use the backlight, the backlight tooling fee would be upper than 1000 USD or more, the more complicating structure on the backlight, the tooling fee would be higher. for saving the cost of tooling fee on lcd backlight, the simple structure would be cheaper.

The MOQ of custom lcd display for monochrome lcd is calculated based on the mother-glass of LCD panel, some person may ask, what is mother-glass of lcd panel? is it the mother of lcd panel? no, no,no..., it is just a joke, the mother-glass of lcd is the primary glass of lcd, we also call it ITO glass, because it have an ITO layer on the glass. the lcd panels are array on the mother glass in manufacturing lcd panel, and cutting it one by one after lcd cell production finished. the main mother glass sizes if 14"x16", as in lcd manufacturing, for stable running in the full-auto machine line, it is at least 50 set of 14"x16" for an production running, that is the smaller sizes of lcd, the bigger MOQ of lcd quantity is necessary.

1. Confirm the sizes what you would like to custom making? the custom mono lcd displays would be mainly less than 10", the custom sizes is up to the mother glass of lcd panels that is less than 14"x16". the custom mono lcd can be custom made the random sizes below 10".

If you would not like to custom lcd display, you could choose the standard lcd from the following list, it is no MOQ requirement for the standard lcd.

Monochrome lcd display have TN, STN LCD, monochrome tft lcd types. the monochrome lcd could be with or without backlight. even for monochrome lcd display, it have difference LCD colors for choosing, such as yellow-green mode, blue mode, gray mode, black-white mode, negative display mode and positive display available. the backlight color could be white, green, orange, yellow-green colors.

they have since replaced it and it has become another random piece of e-waste in my pile. Im not sure about what contract/agreement they had with verizon on it, and im not them so i cant even call verizon to try to fix it.

If the issue persists on the external monitor, it may be an issue with the video card (GPU) or video settings and not the laptop LCD panel. Go to verify display or video issues in Windows Safe Mode. Otherwise, go to the next step.

Performance issues may occur if there is any damage to the LCD screen. The display may stop working, work intermittently, flicker, display horizontal or vertical lines, and so on, if there is damage to the display screen.

Dell laptops have integrated diagnostic tools that can determine if the screen abnormality is an inherent problem with the LCD screen of the Dell laptop or with the video card (GPU) and computer settings.

When you notice screen abnormalities like flickering, distortion, clarity issues, fuzzy or blurry images, horizontal or vertical lines, color fade, running a diagnostic test on the LCD helps identify if the issue is with the LCD panel.

Press and hold the D key and turn on the computer to enter the LCD built-in self-test (BIST) mode. Continue to hold the D key until you see the entire screen change colors.

If you do not detect any screen abnormalities in the integrated self-test mode, the LCD panel of the laptop is functioning properly. Go to the Update the video card (GPU) driver, monitor driver, and BIOS section.

If you notice any abnormalities in the LCD built-in self-test mode, contact Dell Technical Support to learn more about repair options that are available in your region.

Display settings like brightness, refresh rate, resolution, and power management may affect the performance of the LCD screen on your Dell laptop. Changing or adjusting the display settings can help resolve several types of video issues.

If the diagnostic tests on the LCD panel and the video card (GPU) passed, it is most definitely an issue that is related to software that is installed on the computer. If the above troubleshooting steps did not resolve the issue, you may try to restore the computer to factory default settings as a last resort.

A while ago, thanks to the joys of eBay and manufacturing in China, I ordered some low-cost 16×2 LCD character screens, and they finally arrived.  Yeah, now I can get down to trying to output some text to the LCD screen, just one of the pieces of the puzzle for creating a metro ‘next train’ monitor.

For the first step, I just wanted to see if I could get it to work, so I started with the Hello World tutorial.  I wired it up using a breadboard, and put in a header that I had into the breadboard, and then set the LCD screen on top, unsoldered.

Second, the tutorial also did not have the backlight lit, which was a mistake.  My LCD was extremely difficult to read without the backlight, so I wired up the backlight by connecting the last two pins to +5v and ground respectively.  While the wiring was done correctly (I check multiple times), the LCD would just output square boxes on the top line.

So I went into investigative mode, first pulling out the multimeter to check the voltages (too clumsy as I needed two hands and had to hold wires to the multimeter leads), and instead used the analog in of the Arduino to read the voltage (1023 = 5v, and 0 = ground).  After several checks I found the problem:  the RW pin was not being successfully pulled to ground.  While on the breadboard it was at 0v, and on the header pin sticking up it was at 0v, when I touched to the plated part of the LCD pin ins, I was getting 5v.  No idea how, and why it was at 5v exactly and not a floating voltage is beyond me.  Either way, obviously not good and despite my attempts to move it around and to hold a wire to it to ground, did not get a change.  I was not sure if the LCD screen had been fried (again, forums had indicated this possibility if you used less than a 10k pot).

Solution was to solder it. As soon as I had done that (thanks to learning how to solder earlier), the LCD display made that first output:  Hello World!, along with the number of seconds since it started.

I wanted to experiment, and instead of controlling via a pot, I wanted to control the contrast by a PWM pin.  This is also part of my objective in a future project.  So I build a display contrast tester, that automatically steps through the different PWM outputs from one of the Arduino PWM pins, changing the contrast based on that output and writing it to the LCD screen and to the serial monitor.  Thus the LCD Contrast Tester was created.

And see the LCD Contrast Tester in action.  You can see about 120 is the best contrast for this LCD, which approximately half (128 would be 50% of the way).

However, one thing that happens is that after a random amount of time, the LCD screen screws up:  it starts scrolling random text, or instead of putting the numbers for the PWM in the right spot, starts changing things elsewhere.

And code for the LCD Contrast Tester.  Note that in this code I also added in digital control of the backlight pin, so that it goes through the first cycle with no backlight, then turns it on for the second cycle, off for the third, etc.  To avoid using this, just put the backlight positive from the LCD (second last pin in the LCD) to +5V, as opposed to digital pin 7.

The random characters are appearing because of the use of the PWM to control the contrast on V0. Apparently, this causes some issue because of the nature of the PWM signal.

I put the V0 back to the pot output, reset the board, and it ran for an hour without an error or random character appearing. Then I put it to the PWM output and within 2 seconds the error had appeared. Going back to the pot output does not fix it: once the error is there, it is there!

Leet is a type of symbolic spelling in which letters are replaced by lookalike numbers, punctuation, other symbols, and even characters from other languages. For example, "hello" written as "|-|3110".

ASCII characters for graphics, dungeons (random and infinite), and monsters, but also many (optional) storylines that help hold all the features together to stop it from becoming boring.

These characters are not part of the standard 26-character Latin alphabet, but are used in the Swedish alphabet (many Scandinavian languages use such extended versions of the Latin alphabet).

This is the first splash that doesn"t end with an exclamation point (!), other than the special "missingno" splash. As its text implies, the splash is never displayed in Java Edition (but displays in other editions).

(Obfuscated) This splash is stored as "§kFUNKY LOL" in splashes.txt; as with the "Colormatic" splash, the "§k" is a formatting code, but instead of changing the color of the following text, the code obfuscates the text, replacing it with random, rapidly-changing characters.

A reference to the video "Random Changes and Bad Game Design" by the YouTuber _MethodZz_, where he repeatedly uses this phrase while demonstrating several bugs in Java Edition 1.14.

Here is a simple project on how to build/generate/make custom characters in 16×2 lcd and then print/display them on lcd using microchip pic16f877 microcontroller. Character lcd contains a set of ascii characters and some Chinese characters in their controllers. We invoke the ascii characters present in the ram for displaying them on lcd. But if we want to display some special characters, symbols or similes we first have to make/declare them in the ram of lcd controller since they are not present in the ascii character set of the lcd. Then we can invoke them for displaying on the lcd when ever is required.

Building and displaying self made custom characters on lcd is not a very hard task. To carry out this task you must know about the internal structure of character lcd. The size of the lcd controller ram, registers of the lcd and CG-RAM(Character generated ram) of lcd. CG-RAM is the most important part of lcd for generating and displaying self made custom characters. CG-RAM is a whole big topic so it is kept in a separate post. CG-RAM is fully discussed in the tutorials below. I recommend you to please take the tutorials other wise you will not unable to understand the code below.

Circuit diagram of the project is given below. Port-B of Pic16f877 microcontroller is connected with data pins of lcd. LCD controlling pins en(enable), rs(register select), r/w(read/write) are connected to Port-D pin 6 and 7. R/W(Read/Write) pin is grounded because we are only writing to lcd, Grounding the R/W pin enables the write operation for lcd. All the other connections are necessary connections to brought the microcontroller and whole circuit in working condition.

Code is written in c language. MP-LAB ide and High TECH C compiler is used to compile the code. First i included the header file htc.h. This file must be included in every project which is going to be compiled in High Tech c compiler. Then frequency of the crystal is defined which is 20 MHz. Lcd control pins are defined next. Then some character arrays are defined. These character arrays are actually the custom characters which we are going to display on lcd. Delay function is used to give some arbitrary delay where needed. lcdcmd() function is sending commands to lcd. display() function is displaying characters on lcd. lcdint() function is initializing our lcd. In the main function I am generating and then displaying character on lcd.

To understand the code you must first know the internal structure of lcd. The tutorials links given above are very helpful for understanding the working and internal structure of CG-RAM of lcd. If you didn’t take the tutorials. I recommend you to please go through them before going through the code below.

The eight characters which i made and displayed on the 16×2 lcd are just random images and symbols. Heart symbol, rocket image and battery capacity image is made and then displayed on the 16×2 lcd. The above code can work with any size of character lcd 8×1, 8×2, 16×1, 16×2, 16×4, 20×1 , 20×4. since each lcd contains the same Hitachi hd4478 lcd controller in them. You may need only to change the row and coulomb of the character displayed.

In the previous chapter, we have discussed how a character LCD is interfaced with a PIC microcontroller in 8-bit mode, where we used predefined characters stored in the LCD to display our data. In this article, we will learn more about the LCD and how we can create and use custom characters.

DDRAM or “Data Display Random Access Memory” is the working data buffer of the display. Each character on the display has a corresponding DDRAM location and the byte loaded in DDRAM controls which character is displayed.

CGROM or “Character Generation Read Only Memory” holds all the standard patterns for the 5 x 7 dot matrix characters. For instance, if you want to display character “A”, you would send ASCII code 65 (decimal) to the DDRAM. The display controller looks up the pattern of dots to display for this code in the CGROM and lights up the ones appropriate for “A”. The CGROM contents depend on the particular character set and model of display, US, Chinese etc. and cannot be changed.

CGRAM or “Character Generation Random Access Memory” allows the user to define special supplementary non-standard character types that are not in the CGROM. You can load your own dot pattern shapes and call these up for display.

For making custom patterns we need to write values to the CGRAM area defining which pixel to glow. These values are to be written in the CGRAM address starting from 0x40. CGRAM has a total of 64 Bytes. For LCD using 8×5 dots for each character, you can define a total of 8 user defined patterns (1 Byte for each row and 8 rows for each pattern).

Custom characters are assigned fixed display codes from 0 to 7 for pattern stored in the location pointed by CGRAM address 0x40, 0x48, 0x56… and so on. So, if the user wants to display second pattern (pattern stored at CGRAM address 0x48), simply call the data function with value 1 as an argument at a desired location in the LCD.

To display the sequence in the LCD, we need to specify the position on LCD and which pattern to display at the position. Provide adequate delay in between frames to observe the sequence distinctly.

Excel provides three functions for generating random values: RAND(), RANDARRAY(), and RANDBETWEEN(), but there’s no comparable function for generating random letters. The truth is, most of won’t need to generate random numbers, but if you do, you want to do so quickly, right? Fortunately, by combining a couple of functions, you can generate random letters. In this article, I’ll review those two functions and then show you how to combine them to get quick results.

First, let’s review RANDBETWEEN(). This function returns a random integer value between two specified values, every time the sheet is calculated. That last part is important, and we’ll get back to that later. Its syntax,

has only one argument, which in this case, will be a value between 1 and 255. Those values represent characters in the system’s character set, which was originally based on ANSI and for our purposes in Excel is ASCII decimal. It’s doubtful you will need that information, but it doesn’t hurt to know about it.

Figure A shows a sheet of characters returned by the CHAR() function using the values 65 through 90 and 97 through 122. We’re not concerned with the characters returned by any other value.

At this point, we have a function that returns random numbers between two specified values and a function that converts values to alphabetic characters. By combining them, we can create a function that returns random letters.

You can change the bottom and top values to reduce the number of letters returned. For example, if you wanted to return random letters between e and j, you’d use the expression:

First, the RANDBETWEEN() function returns a random letter between bottom and top. Then, the CHAR() function translates that value into a character, in this case, letters of the English alphabet.

Returning a single random letter or a series of single random letters is fairly easy once you know how to combine CHAR() and RANDBETWEEN(). How would you return a random set of more than one letter?

If you want a series of random strings, as shown in Figure C, simply concatenate two functions. Let’s suppose you want the first letter to be uppercase and the second to be lowercase. In this case, you’d use the following function:

The first combined function returns a random uppercase letter and the second returns a random lowercase letter. The & character is a concatenation operator. It simply combines the results of both functions; it doesn’t total values.

Earlier, I mentioned that RANDBETWEEN() calculates every time you calculate that workbook. That means every time you enter anything or press F9, these functions return different characters. That might not matter, but if it does, you’ll want to convert the results into literal values. To quickly convert functions to their literal values, do the following:

This simple combination yields flexible results—you can randomly return as many letters as you need. In a future article, we’ll use RANDBETWEEN() to generate random content.