P‐4.14: D‐Vcom adjustment algorithm for VR display products research and experimental validation

The current method of Vcom adjustment in VR products is to start with the smallest Vcom and increase the voltage with a larger adjustment step while testing the change in flicker value, the flicker value will slowly decrease and when the flicker value starts to get bigger, reduce the adjustment step and adjust the Vcom in the opposite direction until the second flicker gets bigger and meets the specification, then the optimum Vcom will be found (quotes) [1].There are obvious drawbacks to this current approach: 1. Dueto the different optimal Vcom of different modules, the time to find the optimal Vcom is long and not fixed;2. Vcom will drift with time (Vcom Drift), the problem of irregular time will lead to increased risk of Flicker NG. In order to solve the shortcomings of the current Vcom adjustment methods, we introduced the mathematical theory and deduced the Vcom calculation process to establish the deterministic‐Vcom (D‐Vcom) algorithm. After experiments, the DVcom algorithm can effectively reduce the Vcom adjustment time and has the advantage of fixed adjustment time. This is very helpful for the actual production efficiency and optical stability of the products.