THE Huawei presented several news at its Developer Conference, including the HarmonyOS operating system and a TV with a retractable camera; she also demonstrated a LCD screen with built-in digital reader. Typically, this technology for cell phones requires an OLED panel to function.
The prototype showed up at the Huawei Developer Conference (HDC 19) in China. It is a cell phone with thin edges and without notch: the user put the finger at the bottom of the LCD screen, and the device is unlocked in less than 1 second.
LCD screens have difficulty with built-in digital reader
Several cell phones now incorporate the fingerprint reader under the screen, including top-of-the-line models like the Xiaomi Mi 9 and intermediate devices like the SamsungGalaxy A50. They all have something in common: the OLED panel.
In most cases, the fingerprint reader under the screen has an image sensor and its own lighting source: with this, it takes a “photo” from the tip of your finger and analyzes the lines of your fingerprint. The OLED panel is ideal for this, because it is partially transparent and allows light to pass between the diodes. In addition, it is much thinner than an LCD display.
However, cheaper devices often use LCD screens. For an optical digital reader to be embedded in this type of panel, it is necessary to make some adaptations. For example, the Chinese Fortsense put a membrane between layers of the display, capable of scanning your finger in 160 different positions.
BOE Display Technology announced that it has developed an optical digital reader for LCD screens, and that plans to mass produce the display by the end of the year. In turn, the Taiwanese AU Optronics revealed a screen with optical sensor and LTPS panel: it has 6 inches, Full-HD + resolution (2304 × 1080) and a density of 403 ppi.
It is a sign that more accessible cell phones, with LCD screens, should gain readers built into the display starting next year. Huawei could use it in intermediate models in the future; after all, she already shows interest in technology.