Method for testing OLED substrate and OLED display

1. In a method for testing an OLED substrate comprising:

an insulating substrate;

a plurality of selection signal lines arranged on the insulating substrate;

a plurality of data signal lines arranged so as to cross the selection signal lines;

switching elements respectively having a selection terminal and a data terminal at each intersection area of the selection signal lines and the data signal lines;

OLED elements where data is provided via the switching elements; and

a plurality of common control lines which apply a voltage in accordance with light emitted by the OLED elements, said method comprising;

the first step of providing the selection signal lines with a first pulse signal and then providing the common control lines with a second pulse signal in synchronization between the first and the second pulse signals while providing all of the data signal lines with a predetermined level of signal to obtain a first current value passing through a switching element group connected to a selection signal line at each time when providing respective pulse signals;

the second step of providing the data signal lines with a third pulse signal sequentially while providing all of the selection lines with the first pulse signal and then providing the common control lines with the second pulse signal in synchronization between the first and the second pulse signals to obtain a second current value passing through a switching element group connected to a data signal line; and

the third step of operating a current passing through each switching element including an OLED element from current values for each pulse signal obtained by the first and the second step.

2. The method for testing an OLED substrate according to claim 1 , comprising:

providing each selection signal line with a first pulse signal in a different level, respectively, and obtaining a first current value passing through a switching element group connected to a selection signal line in the first step; and

providing all selection signal lines with a first pulse signal in a different level and obtaining a second current value passing through a switching element group connected to a data signal line to determine the electron mobility or the threshold voltage of the switching elements from each current value.

3. OLED display apparatus including an OLED substrate, said OLED substrate comprising:

an insulating substrate;

a plurality of selection signal lines arranged on the insulating substrate;

a plurality of data signal lines arranged so as to cross the selection signal lines;

a plurality of pixels arranged in a matrix, each of the pixels including a switching element and an OLED element, the switching element electrically connected to a selection signal line and a data signal line;

a memory configured to store a first data and a second data, the first data being current values of the pixels in each row, the second data being current values of the pixels in each column; and

an operation part electrically connected to the memory, for calculating a third data based on the first data and the second data stored in the memory, the third data being correction data supplied to the data lines.

4. The OLED display apparatus according to claim 3 , wherein said switching elements are amorphous silicon thin film transistors.

5. The OLED display apparatus according to claim 3 , wherein the third data includes current values which are to be passed to each of the pixels.

6. In a method for testing an OLED display apparatus comprising:

an insulating substrate;

a plurality of selection signal lines arranged on the insulating substrate;

a plurality of data signal lines arranged so as to cross the selection signal lines;

a plurality of pixels arranged in a matrix, each of the pixels including an OLED element and a switching element electrically connected to the selection signal line and the data signal line; and

a plurality of common control lines, each electrically connected to the OLED element in each of the pixels;

the first step of providing the selection signal lines with a first pulse signal and then providing the common control lines with a second pulse signal in synchronization while providing all of the data signal lines with a predetermined level of signal and obtaining a first current value passing through a switching element group connected to a selection signal line at each time when providing respective pulse signals;

the second step of providing the data signal lines with a third pulse signal sequentially while providing all of the selection signal lines with the first pulse signal and then providing the common control lines with the second pulse signal in synchronization and obtaining a second current value passing through a switching element group connected to a data signal line; and

the third step of operating a current passing through each switching element including an OLED element from current values for each pulse signal obtained by the first and the second step.

7. The method for testing an OLED display apparatus according to claim 6 , comprising:

providing each selection signal line with a first pulse signal in a different level, respectively, and obtaining a first current value passing through a switching element group connected to a selection signal line in the first step; and

providing all selection signal lines with a first pulse signal in a different level, and obtaining a second current value passing through a switching element group connected to a data signal line to determine at least one of the electron mobility and the threshold voltage of the switching elements from each current value.