arduino tft display brightness brands

I have bought a 2.5" TFT shield online, which is equipped with the ILI9341 controller. I need to dim the intensity of the background LEDs to match ambient light.

This particular shield does not provide a pin to control the intensity of the LEDs with PWM via a separate input, so I need to dim the background LEDs of this display via software.

I wrote a new function to set the display"s brightness by controlling the background LEDs, but something is missing as I can seem to be writing correctly to the display. So I"m trying to get the display to answer to a known command first, like 0x28 (Display Off).

I can get the display to react to the Display Off command (0x28), but only when I issue it in the begin(..) function. So, the original code in Adafruit_TFTLCD.cpp is like this:

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My main occupation now is to reduce power consumption, since I want this to be in a battery powered gadget. I tried first putting the arduino in sleep mode, but as you know this does not turn off the GPIOs and nor the power source for other components. Then I started focusing on the TFT, and it is where I am stuck:

First questions: When we refere to "turn down backlight", does this mean to turn off the display? I mean, with the backlight off, should you be able to see content in the screen (although with less contrast)?

Open the VCC line with a MOSFET -> if I open the VCC line (disconect the VCC wire on the breadboard), the display keeps displaying stuff, although it looks ugly (where does it takes the energy from?).

Open the GND line -> the displays keeps showing contect but with less contrast (looks good), but I personally do not like to have the GND of the TFT floating. (here the power consumption is reduced from 120mA to 27mA).

If I disconnect the VCC pin, the display continues showing the correct content (I have a program that changes the contect every 5s for test) and the power consumption continues around 118-120mA. However, if I disconnect LED pin, the TFT turns completely dark, and the power consumption drops to 0mA.

Any idea to explain this and how to reduce power consumption? (I have also read about feeding the LED pin with a PWM signal, but I guess that because of current limit, I have to work above 80-90% of duty to display something not very ugly, so I do not like neither).

NOTE: Some Arduino boards have different SPI pins so make sure you check your board documentation.Connect potentiometer pin [DTA] to arduino analog pin [A0]

Start Visuino as shown in the first picture Click on the "Tools" button on the Arduino component (Picture 1) in Visuino When the dialog appears, select "Arduino UNO" as shown on Picture 2

With the growing popularity of easy-to-use hardware such as the Arduino1 or Raspberry Pi2, it is easier to build systems. In this application note, a simple display project is shown wherein the backlight is dimmed from 100% to 0%. It features the C164AXBSYLY6WT character display module (datasheet):

3.bWire up the circuit as shown in the following schematic (Figure 3). It should look similar to Figure 4. Note that Arduino pins 4 to 9 are digital I/O pins. Arduino boards also have analog I/O pins. Connect the Arduino to a PC via the USB cable.

The LCD is powered from the Arduino (+5V) through its USB port. LCD contrast is varied via potentiometer R1 through pin VO. Reset (RS), Enable (E), DB4 to DB7 is controlled via the sketch. While R/W is grounded (logic LOW); this means that the program is writing to the LCD register. If it is a logic HIGH, then it is reading from the LCD register. LED+ is connected to pin 10 of the Arduino which functions as a PWM.

The programming language used in the Arduino IDE is a derivative of C and C++ programming languages. At the heart of this sketch is LiquidCrystal library which is installed by default with the IDE. It is based on the HDD44780 LCD driver and is compatible with ST7066U.

3.dSpecify Arduino UNO is used and select the correct PC COM port. In the IDE top menu, select Tools > “Board: Arduino / Genuino UNO”. Then again, Tools > Port.

The brightness is controlled by line 55 of the sketch. There are 256 levels of brightness corresponding to the PWM duty cycle (0-100%). 0% or 0 means no backlight while 100% or 255 is full backlight.

In this example, we initially print some text to the LCD (lines 39-46). The brightness is first set to 100% (i.e. 255). Then decrement in 10% (i.e. 25.5) steps with a delay of 3 seconds between each step so you can see the effect (line 56-59).

It is worth noting that Arduino PWMs typically have a frequency of 490 Hz which is more than enough to prevent flicker. The suggested range is 60 to 250Hz. There is an available library where the frequency can be controlled (downloadhere).

Lastly, pay attention to the initialization of the LCD library specifically the wiring of the Arduino pin with the corresponding LCD pin. Incorrect declaration of the pins may result in a malfunction. If RS is connected to 9 and EN is connected to pin 8 of the Arduino, the initialization is:

1Arduino is an open-source development platform for easily building electronics projects that can electrically sense and control other objects. Arduino boards are primarily based on the Atmel AVR (8-bit) microcontroller (Example: Arduino UNO).

2The Raspberry Pi is a single-board computer. It features the Broadcom SOC (System-on-Chip) which includes a CPU and a GPU. Similar to the Arduino, it can be used for electronics projects (professional or hobbyist).

Visible in sunlight-readable display TFT LCD Module does not fully recover its color in sunlight, but it can still be seen clearly, with only a slight change in color.TFT is divided into semi-penetrating and reflective types. In the sunlight, the semi-transparent brightness will have a certain degree of reduction, the color deviation will also have a certain degree of change, which is generally acceptable.

The outdoor sunlight-readable display effect of reflective TFT is better than that of semi-penetrating TFT because the former is displayed by the brightness of a complete backrest light plate, while reflective TFT is similar to the mirror, which can improve the display brightness by borrowing the ambient brightness. Therefore, the higher the ambient brightness is, the higher the screen brightness will be.

This paper makes a comprehensive comparison between high brightness TFT LCD and horizontal TFT LCD from the aspects of technical parameters, display performance, and cost evaluation. After reading this article, you will have a deep understanding of sun-readable TFT and how to select sun-readable TFT LCD to select the most suitable commutating TFT LCD or high-brightness TFT LCD for your outdoor display.

As can be seen from the parameters, STONE STVA035WT-01 is a sunlight readable TFT LCD module with a brightness of 1000 CD /m2. The color TFT LCD has a 320×240 resolution, supports RS232/USB ports, has a 3.5-inch diagonal size, and has resistive and capacitive touch screens. The TFT model has a built-in Cortex M4 driver chip.

The 3.5-inch daylight readable TFT LCD has a logical power supply voltage (V) ranging from 6V to 12v, with a maximum of 40V. With led backlight, the Angle of view is 70/70/50/70, when the grayscale is reversed 12, the aspect ratio is 4:3. It can work at -20℃~ +70℃, and the storage temperature is -30℃~ +80℃.STONE daylight readable TFT LCD is an ideal choice for outdoor industrial measuring instruments, testing equipment, measuring tools, outdoor display, and other industrial electronic equipment.

Because of the requirement of the display that works in a bright environment and direct sunlight, the requirement of a TFT LCD screen is higher and higher.

Horizontal reflection TFT displays have a layer of reflectors in front of the backlight. Incident light bounces off the reflective layer and is used to illuminate the TFT display. Therefore, the TFT LCD module has two characteristics of “transmission” and “reflection”.

1. The reflective TFT display has good readability under bright ambient light and direct sunlight. Transmission TFT LCD displays can only work under backlight, while transverse reflection TFT displays are characterized by a reflector on the color filter of the TFT unit, so the incoming ambient light is reflected in the TFT reflective layer and then illuminates the display. Thus, the readability of the content is perfect in very bright sunlight, even without backlighting.

2. Compared with the traditional “transmission only” display, another advantage of the cross-flow TFT LCD display module is power saving. Cross-flow TFT LCD displays combine the advantages of both transmission and cross-flow displays so that TFT displays are fully readable under almost any ambient light condition. In addition, they are highly energy-efficient and are ideal for battery-powered devices and mobile applications. In a bright environment, customers who use a retro-streamlined TFT-LCD can save power by reducing or turning off the backlight of the display, due to the dominance of “reflection” mode.

The horizontal TFT LCD modules of brands such as Winstar Raystar have higher horizontal flow. If they only use the semi-transparent reflective polarimeter back delivery TFT LCD with a reflectance of only 2%, then it is not a true semi-transparent reflective TFT LCD.

The STONE sunlight-readable display module adopts the “transmission” mode, which improves the TFT-LCD panel structure, expands the color reproduction range under the “transmission” mode, and realizes a new TFT-LCD module, which gives full play to the advantages of the transmitted TFT LCD module in a vivid display of color.

There is no best, only the most suitable, through the general introduction of this article. Have you decided what type of LCD display module to choose for your outdoor sunlight-readable display module?

Arduino is an open-source electronics prototyping platform based on flexible & easy-to-use HW and SW. It"s intended for creating interactive objects or environments (it can read sensors, perform actions based on inputs from buttons, control motors, etc...).

All Arduino boards have one thing in common: they are programmed through the Arduino IDE. This is the software that allows you to write and upload code.

In electronics world today, Arduino is an open-source hardware and software company, project and user community that designs and manufactures single-board microcontrollers and microcontroller kits for building digital devices. Arduino board designs use a variety of microprocessors and controllers. The boards are equipped with sets of digital and analog input/output (I/O) pins that may be interfaced to various expansion boards (‘shields’) or breadboards (for prototyping) and other circuits.

The boards feature serial communications interfaces, including Universal Serial Bus (USB) on some models, which are also used for loading programs. The microcontrollers can be programmed using the C and C++ programming languages, using a standard API which is also known as the “Arduino language”. In addition to using traditional compiler toolchains, the Arduino project provides an integrated development environment (IDE) and a command line tool developed in Go. It aims to provide a low-cost and easy way for hobbyist and professionals to create devices that interact with their environment using sensors and actuators. Common examples of such devices intended for beginner hobbyists include simple robots, thermostats and motion detectors.

In order to follow the market tread, Orient Display engineers have developed several Arduino TFT LCD displays and Arduino OLED displays which are favored by hobbyists and professionals.

Although Orient Display provides many standard small size OLED, TN and IPS Arduino TFT displays, custom made solutions are provided with larger size displays or even with capacitive touch panel.

Our company specializes in developing solutions that arerenowned across the globe and meet expectations of the most demanding customers. Orient Display can boast incredibly fast order processing - usually it takes us only 4-5 weeks to produce LCD panels and we do our best to deliver your custom display modules, touch screens or TFT and IPS LCD displays within 5-8 weeks. Thanks to being in the business for such a noteworthy period of time, experts working at our display store have gained valuable experience in the automotive, appliances, industrial, marine, medical and consumer electronics industries. We’ve been able to create top-notch, specialized factories that allow us to manufacture quality custom display solutions at attractive prices. Our products comply with standards such as ISO 9001, ISO 14001, QC 080000, ISO/TS 16949 and PPM Process Control. All of this makes us the finest display manufacturer in the market.

Without a shadow of a doubt, Orient Display stands out from other custom display manufacturers. Why? Because we employ 3600 specialists, includingmore than 720 engineers that constantly research available solutions in order to refine strategies that allow us to keep up with the latest technologiesand manufacture the finest displays showing our innovative and creative approach. We continuously strive to improve our skills and stay up to date with the changing world of displays so that we can provide our customers with supreme, cutting-edge solutions that make their lives easier and more enjoyable.

Customer service is another element we are particularly proud of. To facilitate the pre-production and product development process, thousands of standard solutions are stored in our warehouses. This ensures efficient order realization which is a recipe to win the hearts of customers who chose Orient Display. We always go to great lengths to respond to any inquiries and questions in less than 24 hours which proves that we treat buyers with due respect.

Choosing services offered by Orient Display equals a fair, side-by-side cooperation between the customer and our specialists. In each and every project, we strive to develop the most appropriate concepts and prototypes that allow us to seamlessly deliver satisfactory end-products. Forget about irritating employee turnover - with us, you will always work with a prepared expert informed about your needs.

In a nutshell, Orient Display means 18% of global market share for automotive touch screen displays, emphasis on innovation, flexibility and customer satisfaction.Don"t wait and see for yourself that the game is worth the candle!

We support our purchasers with ideal high-quality merchandise and significant level company. Becoming the specialist manufacturer in this sector, we now have received loaded practical encounter in producing and managing for Tft Lcd Arduino Uno, Segment Lcd, Tft Display Screen, Vehicle Touch Displays,Active Matrix Tft Colour Lcd. "Passion, Honesty, Sound services, Keen cooperation and Development" are our goals. We"ve been here expecting close friends all around the earth! The product will supply to all over the world, such as Europe, America, Australia,Borussia Dortmund, Lesotho,Wellington, Macedonia.With the growing of the company, now our products sold and served at more than 15 countries around the world,such as Europe,North America,Middle-east,South America,Southern Asia and so on. As we bear in our mind that innovation is essential to our growth, new product development is constantly.Besides, Our flexible and efficient operation strategies,High quality products and competitive prices are exactly what our customers are looking for. Also a considerable service brings us good credit reputation.

Note: The following picture is the connection diagram of the 2.8-inch TFT screen and Arduino uno, but this product is connected in exactly the same way.

If the Arduino board has an ICSP interface, set the SPI Config switch on the display module to the ICSP direction (by default) (the company"s Arduino UNO motherboard has an ICSP interface, just plug it in directly.).

This product uses the same LCD control chip and touch panel control chip as the 3.5-inch TFT screen of the same series of our company, so the code is completely compatible. The following takes 3.5-inch TFT as an example to introduce.

LCD_Show can display colorful patterns with different shapes and times. LCD_ShowBMP is for displaying the picture in BMP, and LCD_Touch is for using the touching function.

The display controller used in this product is ILI9486, and we need to initialize the controller through the SPI communication protocol, and the initialization functions are written in LCD_Driver.cpp.

The function functions related to the screen display are written in LCD_GUI.cpp. The function of each function and the parameters passed are explained in the source code. You can call it directly when you need to use it.

Before using LCD_ShowBMP to display pictures, first copy the pictures in the PIC folder in the data to the root directory of the SD card (you should understand that in the root directory, that is to save the pictures directly to the SD card, do not put them in any subfolders folder.).

Here is an explanation. This demo shows that the BMP picture first reads the picture data in the BMP format in the SD card through the SPI protocol, and then displays the data as an image.

These functions are all written in LCD_Bmp.cpp. In fact, the image data in BMP format with a specific file name is read from the SD card, and then the display function written by us is called to re-express the data as an image.

In fact, you can also use Image2Lcd image modulo software to convert images of different sizes and formats into array data, and then use the functions we wrote to display them.

Note: The following picture is the connection diagram of the 2.8-inch TFT screen and XNUCLEO-F103RB, but this product is connected in exactly the same way.

This product uses the same LCD control chip and touch panel control chip as the 3.5-inch TFT screen of the same series of our company, so the code is completely compatible. The following takes 3.5-inch TFT as an example to introduce.

After running the demo, it displays some characters and patterns at first, then displays four pictures, and finally displays the touch sketchpad function. Actually, three projects in the Arduino platform code are integrated in the main function, we place the three main functions in sequence and place TP_DrawBoard(); in an infinite loop to achieve the above functions.

Before using LCD_ShowBMP to display pictures, copy the pictures in the PIC folder in the data to the root directory of the SD card, and then insert the SD card into the SD card slot on the back of the screen to start the download program verification.

In fact, you can also use Image2Lcd image modulo software to convert images of different sizes and formats into array data, and then use the functions we wrote to display them.