In an embodiment, a database interface performs a three-step optimistic database access. This is accomplished by removing the landing pad from the cell structure, and instead forming a conductive via structure that provides the electrical connection from the memory stack or device in the structure to an under-metal layer. Those signals which are below the threshold are amplified and are summed up. After the luminous flux of the secondarily diffused lights is condensed with respect to a second orientation component perpendicular to the first orientation on the parallel plane, the condensed lights are illuminated onto the LCD panel. That means this product can be considered itself as practically nontoxic.