Micro LEDvs OLED

Upstream wafer factories like Epistar, HC SemiTek, etc., companies such as Everlight, Advanced Optoelectronic Technology, Harvatek, and others have invested in Mini LED technology, as have IC designers such as Macroblock, Raydium, and Jasper Display, panel producers such as AU Optronics and Innolux, and digital display makers such as Leyard.

Image

Mini LED

.xy(callback) can be directly used when controller is not listening to probe whether touching is going on or not. Properties are updated and can be queried. Callback is optional and works the same way as described above.

General calibration is simple and delivers the custom configuration object. The custom configuration object can the be copied into the application or stored as a module in modules folder of the sandbox.

On the one hand, it has been widely reported that Apple is working on its own micro-LED display research, while on the other hand, it has been extensively reported that Samsung is working on its own micro-LED display research. Micro LEDs, according to Apple, have the potential to make future iPhones even slimmer and brighter than the latest-generation organic LED (OLED) displays that have recently supplanted LCD panels.

Micro LEDdisplay

Reassignment of x and y values in callback for Landscape format wit a Portrait format configuration is a bit a quick and dirty and has performance impact - especially on touch-move/drag. It is better to crate a Landscap format configuration and pass it into the constructor at creation time combined with reversed pin argument list.

The most recent breakthroughs in the LED sector are Mini LEDs and Micro LEDs. Because of their extensive use in smartphones, TVs, displays, laptops, and other electronic devices, these LEDs have a bright future. Their size is the most significant distinction between them. Micro LEDs (100-200 m) are larger than Mini LEDs (100-200 m) (100 m). As a result, both have applications in a variety of sectors.

Mini LEDvs OLED

While X- and X+ are powered with 0V (GND) and 3.3V with two pins in auto output mode, voltage on Y- or Y+ is read with an ADC pin in input-pulldown mode. The fourth pin has to be in plain input mode in order to not interfere with ADC reading. For Espruino, the analog value read is between 0 and 1 and is proportional to the touch position on the x-axis of the touch screen (and the display). Powering Y- and Y+ and reading X- or X+ provides the value for the y-axis.

Use this code example override the values that need to be adjusted for the particular touch screen and display at hand. Only the values that have to be overridden have to be provided as properties in the custom configuration object. Merging of the configuration's properties in the controller are accomplished with a simple mixin by looping through the configuration object's present properties controlled by the default configuration and applying them to the controller.

For display with touch screen display, gather calibration data from touching markers displayed at known display coordinates.

The implementation allows to have multiple, independent, simultaneously operating controllers (Every new TouchRD(...) returns a new instance). Configuration / calibration can happen on creation and while running, including change of callback to allow the application to implement a runtime calibration function as well as different callbacks.

To summarise, both the mini-LED and the micro-LED are excellent purchases, but it all comes down to your purchasing criteria. To purchase a micro-LED, you will almost certainly need a ridiculous amount of cash. Micro LED, on the other hand, is the way to go if money isn’t an issue and you want the most incredible TV available. A prominent reason why many people prefer mini-LEDs is because of this. It’s even the greatest LED display currently available.

Samsung MicroLED

Note that pins passed as 1st and 2nd argument in constructor TouchRD(...) have to be an ADC (Analog to Digital Converter) pin, no matter what board is used. The touch controller module uses them in the analogRead(adcPin) function. Luckily, Espruino boards have all sufficient ADC enabled pins, so wiring all to ADC enabled pins allows to switch them around without concerns to achieve the desired 0/0 origin. Should it become and issue, then - in the the module code - one or both of the digitalWrite([pinB-,pinB+],1)s that happen before the analogRead(pinA-)s - have to change to 2 from 1 to change polarity and with that direction of one or both of the axis:

Mini LED has a greater yield rate than Micro LED in the production process. When paired with flexible substrates, mini LED is also suitable for notch design and very curved backlight. Another feature that helps Mini LED devices have better color reproduction is local dimming. Mini LED technology allows LCD panels to support more HDR categories, and Mini LED products can be as compact as OLED gadgets, saving power.

When the touch screen area overlaps the display area - touch screen has porches - and the configuration for minimum (lowest) and maximum (highest) permits returning x and y coordinates outside of the display, then the application configuration has to catch the display limits and process outliers differently. Even though the porches do not map to the display, they are sensitive and can be used as fixed buttons Some screens have even symbos / icons printed on them for that purpose, such as mail, calendar, music, home, escape, etc. icons. To enable porches, configuration has to allow for the extra Y or X values. See Configuration section.

When touching, apply some but not too much pressure. Use a touch pen or soft, non scratching and rounded down pencil. You may see untouch in the console when coming close to the edges before you reach your expected 'last' pixel. This is expected. Youy can press harder to go closer to the edges but will overuse the touch screen, make dents into it, and shorten the touch screens life. The window or active area of screens on displays usually overlap the display's active area and to reach the 'last' display pixel should be possible without getting an untouch.

For more details about how a resistive touch screen is built and works and how they can be calibrated, see forum conversation at Resistive Touchscreen directly (no touch controller).

For probing use - when controller is in touching / tracking mode (t.t, !tourchRD.w - not watching for a touch down) or NOT enabled (!touchRD.en). Probing can be done with or without using callback. Example shows probing without callback.

Touch Controller has has a default configuration bilt in that can be full or partially overwritten with custom configuration on construction.

NOTE that some properties (.w, .t) should never be changed and pins (yn, xn, yp, xp) never be written to in order to keep touch controller state and state machine valid and working.

miniLED OLED

Micro LEDmonitor

Sketch of Top Portrait view of a 2.6" Touch Screen w/ YUp, XLeft, YDown and XRight edge drive and sense lines with film connector cable (datasheet ER-TP026-1 of BuyDisplay.com by EastRising).

This example uses the - module / class built-in configuration with default calibration for adafruit's 2.8" TFT LCD with (Resistive) Touchscreen Breakout Board w/MicroSD Socket - ILI9341 in Portrait format. Even though built-in configuration is calibrated for specific display, it works pretty well for all portrait with 3:4 ratio format with porch at the bottom.

Note: when you plan to save() the code, overwrite the default enabled configuration place the line with .enable() invocation into the onInit() {...} function to ensure reliable start up upon power on.

People often confuse the two terms. The main difference is that the former does not have a backlight to illuminate the display. When you consider it, a micro-LED is much closer to an OLED TV than a mini-LED. This is because the OLED does not have a backlight. Instead, it can control the contrast of its pixels.

This TouchRD (About Modules) module makes Espruino the controller for resistive touchscreens that do NOT have a built-in controller, such as ADS7843 or XPT2046. The module supports standalone resistive touch screens as well as resistive touch screens mounted on displays.

Image

Image

Rough calibration values can be calculated from values obtained from touching two (2) markers of known position diagonally displayed (near) minimum and (near) maximum for both x and y axis. To balance out non-linearities, it is best to take averages from values per pixel and offsets obtained and calculated from combinations of two of markers in all corners and in the center of the display.

Micro LEDTV

The actual formulas used to calculate accurate touch coordinates are a bit more complex and use values from center touch as base, rather than 0/0. This applies to touch screen only as well to displays with touch screen, because for latter the size and position of most touch screen do not always exactly match those of the display and the minimumb and maximum values read are not exactly 0.000 and 1.000

NOTE: Probing while controller is enabled interferes with touch down watch - pin modes - and most likely create false touch events.

Treating a mini-LED display as if it were a better-LED display is the best way to remember what it is. An LED backlight provides the brightness of an LED display. To see the visuals on the screen, the mini-LED, like LED, requires a backlight.

Micro LEDs have a simpler structure and better performance, but mass transmission is the main concern. Miniaturizing LEDs, which demand wafer-level technology, is the issue.4K Micro LED panels, for example, require more than 24.88 million LED chips.

On display, you can complement the calibration callback code with tracing your dragging to see that you reached the 'last' pixel / border. The code can be found at ADS7843 Touchscreen.Setup your display and add the following line in the callback in the touching branch:

The default configuration can be overridden by passing a configuration object C as the 6th argument in the constructor. The configuration object can be built upfront and passed or provided inline. Latter is shown in code example below (which also shows the default values the module comes with).

A resistive touchscreen exposes four (4) leads which are usually labeled Y-, X-, Y+, X+. The leads can be wired up directly to four (4) pins. At least two (2) of the four (4) pins have to be ADC pins - pins that can read analog values. One ADC pin has to be connected to either Y- or Y+, and one to either X- or X+.

Mini LED and Micro LED are two names that, in theory, signify two different things. Micro LED is a new generation of display technology that uses a matrix of small LEDs to create a display. Each pixel is independently addressed and directed to emit light, similar to OLED (self-emitting). The LED backlight is smaller, thinner, and more evenly distributed, with the LED unit measuring less than 100 micrometers in diameter. Mini LED is a better form of traditional LED backlight and is a transitional technology between traditional LED and Micro LED.