An optical pickup for reading information from a recording medium having a plurality of prepits or for recording information onto the recording medium is provided. The invention produces lower drain the gate voltages resulting in fewer device failures. A first plane of the cleaning blade that is supported by the supporting member, or is opposite to a surface that is supported by the supporting member, and a second plane of the cleaning blade form the contact edge. Furthermore, the successful bid evaluation function is based further on a resource occupation rate in bidding of this time. Accordingly, the present invention provides an organic TFT substrate in which a characteristic of a TFT is improved.