Display requirements:

1. Display size: ≥ 86 inches, using LED backlight source A-standard screen.

2. Display resolution: 3840 (H) x 2160 (V); Brightness: ≥ 400cd/m2; Contrast ratio: 4000:1; Visual angle: ≥ 178 °

3. The power consumption of the entire machine is ≤ 160W, and the energy efficiency in the closed state is ≤ 0.03. The entire machine must comply with the national first-class energy efficiency standard

4. Grayscale: Maximum 128 grayscale, 128 grayscale is a gradient state

5. Display contrast: 5000:1

6. Display angle (degree): 178 °

7. Display lamp life: ≥ 50000 hours

Hardware requirements for the entire machine:

1. Aluminum alloy frame, speaker, interface, button front design, speaker ≥ 2 × 10W, among which the front interface must have PC-USB3.0, TV-USB2.0 adaptive port, HDMI input interface * 1, TOUCH output interface * 1, and the front panel must have at least 7 physical buttons, covering functions such as home page, volume up and down, menu, energy saving, and on/off, and have English identification for quick use by teachers.

2. The side of the entire machine must have commonly used ports such as RF TV port * 1, CVBS port * 1, earphone EAPRHONE * 1, SD card * 1, VGA AUDIO IN * 1, VGA computer port * 1, HDMI input * 1, USB2. port * 1, etc.

3. The whole machine is equipped with a one key button, which can simultaneously meet the three in one requirements of TV on/off, computer on/off, and energy-saving standby button. It also has a switch to choose whether to enable or not, making it easy to operate. In energy-saving standby mode, the screen can be awakened again by tapping; No need for more buttons to prevent teachers from misoperating.

4. For the convenience of touch, the touch area of the entire machine must be about 15mm larger than the display area. In order to achieve the best aesthetic visual effect, the machine frame technology must be designed with ultra narrow frames. The width of the upper, left and right frames must be ≤ 14mm, the width of the lower frames must be ≤ 39mm, the length of the entire machine must be ≤ 1429mm, and the width must be ≤ 880mm.

5. The front frame of the entire machine is equipped with 4mm tempered glass to protect the safety of the LCD screen.

6. The whole machine adopts single or multiple touch points, with a touch resolution of 32767 × 32767 and a fine pen touch writing accuracy of ≤ 2MM;

7. With wireless screen transmission: working frequency of 2.4G or 5G, working distance of 10 meters (without obstruction); (Optional)

Android system configuration and requirements:

1. Equipped with embedded Android 8.0 or above system, with a configuration requirement of no less than the main frequency: CortexA53 * 4 1.5GHz RAM of 3GB or above, storage capacity of 32GB. Under this system, functions such as whiteboard writing, Office software usage, multimedia playback, electronic manuals, and web browsing can be achieved, forming a dual operating system security backup with the built-in computer. The electronic whiteboard software in the Android system can write in two different colors, big and small, and the writing comes with a pen tip, making it easy for teachers to distinguish between annotations and written content.

2. Gesture eraser: embedded in