Interactive smart tablet (commonly known as touch all-in-one machine), as an emerging high-tech teaching device, has been widely recognized in the education industry in recent years and has rapidly gained popularity. At the same time, manufacturers of interactive smart tablets are also springing up, with many brands and uneven quality. So, how should we identify the performance of an interactive smart tablet? In general, we can simply judge the performance of a smart tablet in four ways: touch, read, write, and change. Today we first introduce two methods: "touch" and "look". Touch: Structural design and electrical performance 1. Touch the border: By touching the frame, you can tell whether the frame is made of metal or plastic. The metal frame is relatively beautiful, sturdy, good heat dissipation, and durable, but in addition to professional companies such as Shiwo and Sharp, most brands have not done a good job in electrostatic shielding and safety design. The plastic frame has a relatively low cost, but it is slightly better in heat dissipation and anti-aging. In addition to the material, whether the frame has sharp protrusions or burrs also reflects the quality of the mold. Appearance protrusions will scratch the user, and internal protrusions or burrs may also affect the arrangement of heat dissipation channels and components. 2. Touch the display screen (1) Touch the screen temperature. In the classroom, teachers often stand in front of the screen for a long time. The temperature of the screen is too high, which is really a kind of suffering. At present, most of the smart tablet products use LED screens and LCD screens. In contrast, LEDs have lower power consumption and relatively lower screen temperatures. In addition to the type of screen, the temperature of the screen also indirectly reflects the power consumption level and heat dissipation design level of the whole machine. (2) Use a sharp hard object to lightly stroke, use a fist to strike the glass properly to test its hardness and toughness. In the classroom, children often collide. If you do n’t use professional tempered glass, the glass will be broken by the impact and it will bring huge safety hazards to the children. At the same time, only professional tempered glass can meet nearly one million writing tests. See: HD screen display 1 Look at the HD display effect: In a good interactive smart tablet, the connection between the built-in computer and the LCD driver board should in principle use HDMI high-definition connections to ensure the loss-free transmission of high-definition digital signals. Some manufacturers use VGA cables for transmission. Even for high-definition signals, after analog conversion, the signal quality has been greatly affected, and there is no mention of high-definition display effects. We can use the third-party software singowsXP, can clearly judge the different display screens by the sharpness of the light and dark vertical stripes. 2. See the transition of the same color between different shades Open a high-definition picture with a color gradient and observe the gradient part carefully. A smart tablet with a good effect will be very rounded in the gradual transition, with a smooth transition and high sharpness, and bright colors; while a tablet with a poor display effect will have a low sharpness, and it will become a piece or a piece of the transition at the transition A mosaic appears, and the color is relatively dark. 3. Look at the color change of different viewing angles Under the same light conditions, viewing the screen color from different angles can determine the viewing angle of the screen. The color display and the screen with a good viewing angle will not be much different when viewed at any angle. On the contrary, the picture will be obviously dark and accompanied by color running. 4. Look at the characters displayed on the screen Good high-definition display, the color of the characters will be more full and full, there will be no irritability, reflection and lack of painting, and it is more intuitive to observe whether the characters in the corners will be stretched and deformed. 5. Look at the brightness We can adjust the tablet to a pure white screen in the standard mode recommended by the manufacturer, and we can directly distinguish the difference in screen brightness under mutual comparison. 6. Look at the scan frequency In addition, in order to avoid children's long-term viewing caused by myopia, Shiwo Interactive Smart Tablet will only use the LCD screen with a scanning frequency of more than 120Hz. We know that if the scanning frequency of the LCD screen is lower than 75Hz, the image will have a flickering feeling. Our eyes need to be constantly adjusted and adapted, and the muscles of the eyes are fatigued for a long time, causing myopia. Here, you can use a simple and easy method to test the scanning frequency, turn on the camera function of the mobile phone to watch the LCD screen, when the LCD screen is not the 120Hz LCD screen, you will clearly see the effect of the wave. cotton/ microfiber yarn for making mops Mop Yarn,Raw Cotton Yarn,Cotton Yarn for Mops,Cotton Yarn WENZHOU HAGO HOUSEHOLD GOODS CO., LTD. , https://www.wzhago.com
Observe the clarity of the junction of the black bar and the white bar to determine the display effect of the display
The left side is a non-HD presentation effect, the right side is a HD display effect 
Even if the display screen with a large viewing angle is viewed from different angles, the color will not be much different
The red circle part clearly shows the lack of painting
You can see that the screen brightness on the right is significantly higher than the screen brightness on the left 
The ripples on the screen can be clearly seen through the mobile phone, which shows that the scanning frequency of the screen is slightly slower (effect picture)