A channel emulating device includes a first choosing module, a first signal integrating module, a first parameter adjusting module, a second choosing module, a second signal integrating module, a second parameter adjusting module and a third choosing module. Each pixel includes a gate electrode, a gate insulating layer, a semiconductor pattern, a source electrode, a drain electrode, a first electrode, and a second electrode. A maximum allowed second oxidation thickness t2 can be determined, that is partially based on a desired step height and a device size, and a first oxidation thickness t1 can be determined that is partially based on the determined thickness t2. The present invention eliminates and inhales the redundancy before bonding the discs, so the smoothness of the disc can be improved to avoid the bubbles while bonding, and providing a disc with good mechanical properties and weather-resistance.