Aspects of the invention disclosed herein generally provide heat engine systems and methods for generating electricity. The cell also includes a switching transistor, connected between the first node and a current source circuit. The circuitry includes a manually operable on-off switch having a first position opening the circuitry and a second position closing the circuitry. Correction means 30 corrects sensitivity variations among pixels, the influence of the infrared radiation from the optical system 20, etc. The control circuit adjusts a write condition of each of the memory cells in accordance with write data to each of the memory cells and memory cells adjacent to the memory cells within the data to be written. The display on a display screen is changed in accordance with the result of the determination.