Difference between revisions of "7inch HDMI LCD (C)"

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== '''Rotation'''(Working with Raspberry Pi) ==

Revision as of 07:24, 27 November 2021

7inch HDMI LCD (C)
7inch HDMI LCD (C)
7inch HDMI LCD (C) (bicolor version

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Primary Attribute
Category: OLEDs / LCDs, LCD, Raspberry Pi LCD
{{{userDefinedInfo}}}: 7inch HDMI LCD (C)
Brand: Waveshare
Website
International: 7inch HDMI LCD (C)
Chinese: 7inch HDMI LCD (C)
Onboard Interfaces
USB HDMI
Related Products

Introduction

7-inch HDMI display, with a resolution of 1024×600 and a capacitive touch panel, which supports Raspberry Pi and can also be used as a computer monitor.

More

Features

  • 7-inch IPS screen with a hardware resolution of 1024×600.
  • 5-points capacitive touch control.
  • Using with Raspberry Pi, it supports Raspbian / Ubuntu / Kali / Retropie and WIN10 IoT, no need to install any drivers.
  • Using as a computer monitor, it supports Windows 10 / 8.1 / 8 / 7, five-point touch, no need to install any drivers.
  • Support backlight control, more power saving.


Working with PC

This LCD can support Windows 7/8 / 8.1 / 10 system.

How to use

1) Turn on the backlight switch on the back of the LCD.

2) Connect the Touch interface of the LCD to the USB interface of the PC. Wait for a while, the windows will automatically recognize the touch function.

3) Connect the HDMI interface of the LCD to the HDMI interface of the PC.

Note: When the computer is connected to multiple monitors at the same time, the touch effect of the 7inch LCD will be applied to the main screen by default. If you need to specify the touch to the secondary screen, see#Calibration touch on Win 10 PC

Adjust the backlight on the Windows

1. Download the 7C_Rev4.1_Windows backlight adjustment file and unzip it to any directory on the computer.

2. Enter the corresponding directory, double-click to open the 7C_brightness_Windows.exe software, and drag the slider to adjust the backlight.

7C Brightness-1.png

Calibration touch on Win 10 PC

Take the windows10 system as an example:

  • 1. Enter the Windows settings of the system, type in the search bar and click "Calibrate the screen for pen or touch input" (as shown in the picture below)

Win10 touch011.png

  • 2. Click "Setup" in the pop-up "Tablet PC Settings" interface:

Win10 touch02.png


  • 3. The following text prompt will appear on the screen. Please tap the touch screen with your finger, and the computer will recognize it as a touch screen.

【Note】If the touch screen is blank, press the "Enter" key, and the text prompt will switch to the touch screen. (The screen which displays the text prompt will be used as a touch screen!)

Win10 touch03.png

Working with Raspberry Pi

How to use

This LCD can support Raspbian / Ubuntu / Kali / Retropie and WIN10 IoT systems. When the LCD works on systems such as Raspberry Pi, the resolution must be set manually, otherwise, it will cause abnormal display. There is no such problem when the LCD works on the PC version of Windows.

Please download the latest version of the image on the Raspberry Pi official website.

1) Download the compressed file to the PC, and unzip it to get the .img file.

2) Connect the TF card to the PC, use SDFormatter.exe software to format the TF card.

3) Open the Win32DiskImager.exe software, select the system image downloaded in step 1, and click‘Write’ to write the system image.

4) After the image has finished writing, open the config.txt file in the root directory of the TF card, add the following code at the end of config.txt, then save and quit the TF card safely.

max_usb_current=1
hdmi_group=2
hdmi_mode=87
hdmi_cvt 1024 600 60 6 0 0 0
hdmi_drive=1

5) Insert the TF card into the Raspberry Pi

6) Turn on the backlight switch on the back of the LCD.

7) Connect the Touch interface of the LCD to the USB interface of the Raspberry Pi.

8) Connect the HDMI interface of the LCD to the HDMI interface of the Raspberry Pi, power on the Raspberry Pi, and wait for a few seconds until the LCD displays normally.

【Note】

For the 2021-10-30-raspios-bullseye-armhf version, the default KMS driver needs to be modified to the FKMS driver to make the LCD display the system desktop normally.

  • Modification method: Open the config.txt file in the root directory of the TF card, find the following line:
dtoverlay=vc4-kms-v3d

change into

dtoverlay=vc4-fkms-v3d
  • Since 2021-10-30-raspios-bullseye-armhf has just been released and still exist many bugs, the bug of the KMS driver that cause the 7inch HMDI LCD(C) cannot display normally will be resolved in the next update of the Raspberry Pi mirrored version. It is recommended that users use the 2021-05-07-raspios-buster-armhf version first.
  • If the user needs to use the 2021-10-30-raspios-bullseye-armhf version, and need to use the CSI camera. Since this system uses the libcamera camera library by default, the library does not support FKMS drivers.So in addition to the above modification, you also need to install the Raspicam camera library.

The installation method is as follows:

cd ~
sudo apt install cmake
git clone https://github.com/raspberrypi/userland
cd userland
./buildme
sudo cp build/bin/* /bin/

Then execute the following command to shut down the system:

poweroff

Connect the Raspberry Pi camera to the CSI interface of the Raspberry Pi, power on the Raspberry Pi again, and after the system boots, execute the following command:

Take a picture:

raspistill -o image.jpg

Take a video:

raspivid -o video.h264 -t 10000

Adjust the backlight on the Raspberry Pi(for Rev4.1 version of the 7inch HDMI LCD(C))

  • Method 1

Download the file through the network, open the Raspberry Pi system terminal, and enter the following commands:

wget https://www.waveshare.com/w/upload/0/06/7C_brightness_Raspi.zip
sudo unzip 7C_brightness_Raspi.zip -d ./7C_brightness_Raspi/
cd 7C_brightness_Raspi
sudo chmod +x 7C_brightness_Raspi     
sudo ./7C_brightness_Raspi -b  X   # X range is 0~10, 0 is the darkest, 10 is the brightest
For example:sudo ./7C_brightness_Raspi -b  10
  • Method 2

Download 7C_Rev4.1_Raspberry Pi to adjust the backlight file via PC, and unzip it to any directory of Raspberry Pi. Enter the Raspberry Pi terminal and enter the following commands:

cd 7C_brightness_Raspi
sudo chmod +x 7C_brightness_Raspi     
sudo ./7C_brightness_Raspi -b  X   # X range is 0~10, 0 is the darkest, 10 is the brightest
For example:sudo ./7C_brightness_Raspi -b  10

7C Brightness.png

About the version

Rev4.1 version

  • Update the USB touch protocol to improve the compatibility.
  • Brightness is adjustable by USB interface.
  • Modify drive circuit for enhancing the anti-interference ability.
  • Change the touch panel color to black.

Rev3.1 version

  • The Rev3.1 version mainly changes the touch chip of the Rev2.2 version from GT811 to GT911. The touch effect is better, and the anti-interference ability is enhanced at the same time.
  • This version is fully compatible with Rev2.1 and Rev2.2, and users can replace it with confidence.

Rev2.2 version

  • Rev2.2 version mainly adds VCOM adjustable potentiometer and related circuits of electromagnetic compatibility on the basis of Rev2.1.
  • This version is fully compatible with the Rev2.1 version, and users can replace it with confidence.

Rev2.1 version:

  • Upgrade to IPS screen, with the larger viewing angle and the clearer display effect, I believe you will like it.
  • Use standard HID protocol, you can transplant your own system conveniently.
  • Using with Raspberry Pi, it supports Raspbian / Ubuntu / Kali / Retropie and WIN10 IoT, single touch, no need to install any drivers.
  • Using as a computer monitor, it supports Windows 10 / 8.1 / 8 / 7, five-point touch, no need to install any drivers.

Rev1.1 version:

  • Using private HID protocol, it is difficult to transplant to your own system
  • Using with Raspberry Pi, you need to install a driver when the display connects to Raspbian or Ubuntu systems. and it doesn't support Kali, Retropie, and Windows 10 IoT.

Resources

Software

Backlight Control

Note: We don't recommend you to do any hardware modification, which may damage LCD if you are not good at it. So be careful when you following this manual

External guides

3D Drawings

LCD Panel Dimension

Certification

Assembly tutorial

FAQ

Question:
What should I do if I connect to the PC with LCD and it cannot display normally?
Answer:
  • Make sure that the HDMI interface of the PC can output normally.
  • The PC only connects to this LCD as a monitor without others.
  • You should connect the touch cable first and then the HDMI cable.
  • Some PC need to be restarted to make the LCD display normally.


Question:
What can I do if the thin red lines appear on the edge of the screen?
Answer:
  • Edit the config.txt and add this line at the end of the config.txt file:
hdmi_drive=1


Question:
What should I do if the screen has the ghosting problem?
Answer:
Adjust the adjustable potentiometer on the back. After the desktop is displayed, adjust the potentiometer to the best display effect, and then leave the screen for a while and wait for the ghost to disappear (it may take several hours).

Potentiometer of 7C.jpg


Question:
How to use the touch function when connected to a Linux PC which is non-designated?
Answer:
You can try to compile the universal touch driver "hid-multitouch" into the kernel, which generally can make the touch function work.


Question:
Can the brightness of the 7inch HDMI LCD (C) be adjusted by modifying the resistance?
Answer:
The default brightness has been adjusted to the highest, you can reduce the screen brightness by increasing the resistance of these two resistors in the picture below.

The picture below shows the Rev3.1 version, which is similar to other versions.

7inch HDMI LCD FAQ02.jpg


Question:
What is the working current for the 7inch HDMI LCD (C) when it works normally?
Answer:
Using 5V power supply, the working current of turning on the backlight is about 490mA, and the working current of turning off the backlight is about 90mA.



Anti-Piracy

Since the first-generation Raspberry Pi released, Waveshare has been working on designing, developing, and producing various fantastic touch LCDs for the Pi. Unfortunately, there are quite a few pirated/knock-off products in the market. They're usually some poor copies of our early hardware revisions, and comes with none support service.

To avoid becoming a victim of pirated products, please pay attention to the following features when purchasing:

RPi-LCD-Anti-Piracy.jpg

(Click to enlarge)

Beware of knock-offs

Please note that we've found some poor copies of this item in the market. They are usually made of inferior materials and shipped without any testing.

You might be wondering if the one you're watching or you've purchased in other non-official stores is original, feel free to contact us.

Support

If you require technical support, please go to the Support page and open a tickets.