a-Si (Amorphous silicon) is a mature backplane technology that has been broadly use on BOE Varitronix TFT products to improve its energy efficiency, refresh speeds, and the display’s viewing angle.
For automotive displays with pixel density lower than 200 ppi, this technology remains the preferable backplane of choice, mainly due to its low costs and relatively simple manufacturing process.
PPI stands for “pixes per inch”, an inch is equal to 2.54 centimeters. Reducing the distance between pixels (pixel pitch) without changing the screen size of the LCD increases the ppi, and the higher this number, the higher the definition of the display.
LTPS (Low Temperature Poly-Silicon) can be spotted behind most of the high-end LCD and AMOLED displays found in BOE Varitronix automotive displays.
LTPS is in fact the only technology that really works for AMOLED right now, due to the higher amount of current required by this type of display technology. LTPS has higher electron mobility, which enable electron can move through the transistor with up to 100 times greater mobility than a-Si. These newer materials enable higher ppi, image quality is greatly improved, at 300ppi or above the image is smooth, the pixel grains and jagged edges of diagonal lines are no longer visible.
By integration of gate circuitry to array glass, BOE Varitronix manufacture GOA (Gate on Array) or GIP (Gate in Panel) can achieved a slimmer or narrow border (L/R) which is critical in some automotive applications such as cluster display, center Information display and rear mirror display etc.
BOE Varitronix GOA also enable free shape display which reduce the size of the frame of the whole machine on the basis of reducing costs.