Display Panel Cell Test Apparatus for Early Power Line Defect Detection

The patent applies preliminary action by performing defect detection at the cell test stage before the LCD is fully assembled. The test signal is applied to the liquid crystal layer and driving voltage lines are tested for shorts before final assembly, allowing defects to be identified early in the manufacturing process when they can be more easily and cheaply addressed.

The patent segments the testing process into distinct stages: cell testing (before assembly) and final product testing. By dividing the testing into these phases and performing critical power line and liquid crystal layer tests during the cell stage, the patent enables early defect detection without requiring complete assembly, thus reducing manufacturing costs while maintaining detection effectiveness.

The patent performs preliminary testing of driving voltage lines for shorts and tests the liquid crystal layer response before final assembly. This preliminary action enables detection of critical defects at the cell test stage without requiring complete LCD assembly, thereby reducing manufacturing costs while maintaining the ability to detect major power line and liquid crystal defects.

The patent uses test signals as an intermediary to indirectly detect power line defects. By applying test signals to the liquid crystal layer and monitoring the response, the system can detect shorts in driving voltage lines without requiring direct access to or testing of the power lines themselves, enabling comprehensive defect detection at the cell test stage.

The patent merges multiple testing functions into a single integrated test process. The test signal simultaneously tests the liquid crystal layer response and detects shorts in driving voltage lines during the cell test stage. This combining of testing functions improves efficiency by performing multiple detections in one operation while managing system complexity through unified test signal generation and analysis.

The test signal serves multiple functions simultaneously: it drives the liquid crystal layer to display test patterns for visual inspection, applies voltage to test for shorts in driving voltage lines, and verifies proper connectivity of power lines. This multi-functionality of the test signal improves testing efficiency without proportionally increasing system complexity, as the same basic test infrastructure performs multiple detection tasks.