Light leakage or backlight bleeding happens when the screen’s Liquid Crystal Display or LCD and the frame do not fit tightly, causing the light of the lamp to be directly emitted. The light leakage of an LCD screen is normal to a certain extent due to the structural characteristics of the LCD screen itself. Generally, the LCD screen will have a slight light leakage during the assembly process, which cannot be avoided.
The basic technology of the screen itself will not be affected by the light leakage such as brightness, response time, life, etc. Our tablet display screens use the latest embedded panel technology, that is to say, the bezel is placed on the screen after it is done unlike the thick bezel of the old-style monitor. Since the screen is attached to the panel, the front panel cannot be closed to the back panel, nor can it be pressed tightly, resulting in this condition which is normal.
You may encounter the situation below when the pen display has black background in dark environment(room). Please be kindly noted that it is NOT light leakage or backlight bleeding, it's caused by reflection of light. You can place your other display, like a laptop, next to the pen display. Both of them have black background screens in dark environment(room), they both show exact images below.