Testing and inspecting method of a plasma display panel
View Patent ↗An improved method of testing and inspecting a plasma display panel. In a plasma display panel, a plurality of cells are formed at an intersection of each electrode disposed in a row direction and in a column direction of the panel. A field is formed of a plurality of sub-fields, and the combination of the sub-fields enables the panel to have a gradation display. In the inspection method, an address pulse voltage is not applied to a target cell to be inspected in a predetermined sub-field, but is applied to at least one cell of the cells adjacent to the target cell, and the address pulse voltage is applied to the target cell in the successive sub-field. If the barrier ribs of the target cell have an imperfection, wall charges of the cell are affected by the discharge occurred in an adjacent cell, and the target cell fails to light on in the successive sub-field. The inspection method can thus detect lighting failure caused by defective barrier ribs.
1. A method of testing and inspecting a plasma display panel in which a plurality of cells are formed at an intersection of each electrode disposed in a row direction and in a column direction, comprising:
forming a field from a plurality of sub-fields, each subfield having an initializing period for producing an initial discharge, an address period for producing an address discharge with application of an address pulse voltage, and a discharge sustain period for producing a sustain discharge, and
obtaining a gradation display using a combination of the plurality of sub-fields that are responsible for turning on the plurality of cells,
wherein, the address pulse voltage is not applied to a target cell in a predetermined sub-field to be tested and inspected, but is applied to at least one specific cell of adjacent cells positioned adjacent to the target cell, and the address pulse voltage is applied to the target cell in a successive sub-field, and it is judged whether the target cell in the successive sub-field is on or not.
2. The method of testing and inspecting a plasma display panel of claim 1 , wherein the specific cell is adjacent to the target cell in a row direction.
3. The method of testing and inspecting a plasma display panel of claim 1 , wherein the specific cell is adjacent to the target cell in a column direction.
4. The method of testing and inspecting a plasma display panel of claim 1 , wherein the specific cell is adjacent to the target cell in a diagonal direction.
5. The method of testing and inspecting a plasma display panel of claim 1 , wherein the specific cell is adjacent to the target cell in at least two of a row direction, a column direction, and a diagonal direction.