Patent ID: 8593445
Filing Date: 2013-11-26
Classification: G09G

Abstract:
1. A display apparatus comprising: a pixel array section; and driving sections, wherein said pixel array section has signal lines each corresponding to one of the columns of said matrix and scan lines each corresponding to one of the rows of said matrix, power-supply lines parallel to said scan lines, each of said pixel circuits is located at an intersection of one of said signal lines and one of said scan lines, said driving sections are a signal selector, a write scanner and a drive scanner, said signal selector is configured to assert a driving signal having an electric potential representing a gradation or a reference electric potential determined in advance on said signal lines each laid as a column of said matrix, said write scanner is configured to assert a control signal on said scan lines each laid as a row of said matrix, said drive scanner is configured to assert a power-supply voltage changing from a high electric potential to a low electric potential alternately on said power-supply lines each laid as a line parallel to said scan lines, each of said pixel circuits includes a specific one of current terminals of said signal sampling transistor is connected to one of said signal lines whereas the gate electrode of said signal sampling transistor is used as the control terminal of said signal sampling transistor and is connected to one of said scan lines, a specific one of current terminals of said device driving transistor serves as the drain electrode of said device driving transistor whereas the gate electrode of said device driving transistor is used as the control terminal of said device driving transistor, said drain electrode of said device driving transistor is connected to one of said power-supply lines whereas said gate terminal of said device driving transistor is connected to the other current terminal of said signal sampling transistor, the other one of said current terminals of said device driving transistor serves as said source electrode of said device driving transistor and is connected to said light emitting device, said signal holding capacitor is wired between said gate and source electrodes of said device driving transistor, when an operation to put said signal sampling transistor in a turned-on state by making use of said control signal is carried out after said high electric potential has been asserted on said power-supply line and said reference electric potential has been asserted on said signal line, a light extinction process is performed as a process to switch said light emitting device from a light emission state to a no-light emission state, thereafter, said signal sampling transistor is put in a turned-off state, then, said power-supply line is switched from said high electric potential to said low electric potential so that a voltage appearing on said source electrode of said device driving transistor is lowered without putting back said signal sampling transistor in a turned-on state in a threshold-voltage compensation preparatory process which is a process of lowering said voltage appearing on said source electrode of said device driving transistor, and subsequently, said power-supply line is switched back from said low electric potential back to said high electric potential and, then, with said signal line sustained at said reference electric potential, said signal sampling transistor is put in a turned-on state by making use of said control signal, causing said voltage appearing on said source electrode of said device driving transistor to rise gradually in a process of electrically charging said signal holding capacitor and, as a result, a voltage appearing between said gate and source electrodes of said device driving transistor is reduced gradually in a direction toward the threshold voltage of said device driving transistor in a threshold-voltage compensation process which is a process to reduce said voltage appearing between said gate and source electrodes of said device driving transistor in a direction toward said threshold voltage.