The present invention relates to a method and device for playing a game in which values of a game piece are gradually revealed. An NMOS transistor generates a current that changes in response to an extent of fluctuation of the power supply voltage, and then the current is converted into a voltage via a resistor to apply a forward bias to a substrate of the MOS transistor. The said composition has high photo contrast, high curing speed, controllable refractive index, low curing shrinkage, high thermo-optic coefficient, low volatility and high viscosity. Sensors are provided for detecting a residual asymmetry in the conditioned beam as the beam approaches the reticle, particularly in a non-scanning direction. A display device comprising the array substrate and a manufacturing method of the array substrate are further disclosed. The first end can be connected to the base by a first shaft and the second end can be connected to the base by a second shaft, such that said solar panel can pivot with respect to the base alternately around the first shaft and around the second shaft under the drive of a lifting mechanism.