Display Panel Test Circuit Switch Isolation
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Solution Overview
Problem
During the manufacturing of display panels, the orientation of liquid crystal molecules is complicated by test signal interference due to shared leads, which affects the accuracy and efficiency of array testing and pretilt angle formation.
Innovation Solution
A test circuit comprising switch units, first test leads, first test pads, and a second test pad, second test lead, third test pad, and switch control line, allowing independent testing of each display panel and controlling switch units to apply specific test signals, thereby preventing interference and forming pretilt angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one lead is connected to a plurality of display panels, then the device complexity is reduced, but test signal interference occurs during array testing
Solution Approach 1:
The patent divides the shared lead into multiple independent test leads, with each lead dedicated to a specific display panel. This segmentation eliminates signal interference between panels during testing while maintaining the simplified connection structure. The switch units are also segmented to control each panel independently through the shared control line.
Solution Approach 2:
Switch units are introduced as intermediary components between the shared control line and individual display panels. These switches act as mediators that isolate panels during array testing while allowing selective connection during orientation processes, resolving the interference problem without requiring completely separate leads for each panel.
2Reliability
If independent leads are provided for each display panel, then test signal interference is eliminated, but the traces become complicated
Solution Approach 1:
The patent merges the control functions of multiple panels into a single shared control line that operates switch units. This combining approach reduces the number of control traces needed while maintaining independent testing capability through the switch mechanism, avoiding the need for completely separate control traces for each panel.
Solution Approach 2:
The shared control line serves multiple functions: it controls switch units for individual panel testing, enables array-wide testing when switches are in specific states, and facilitates orientation processes. This multi-functionality reduces the overall trace complexity while maintaining testing accuracy.
3Measurement precision
If switch units are added to control test signals, then testing accuracy is improved, but the device complexity increases
Solution Approach 1:
Switch units are strategically placed only at critical connection points where signal isolation is needed, rather than throughout the entire circuit. This localized approach provides necessary testing accuracy while minimizing the overall increase in device complexity. The switches are positioned to control access to individual panels without adding unnecessary components elsewhere.
Data Source
AI summary
A test circuit and a test method for display panels are provided. The test circuit comprises: switch units; first test leads; first test pads; and a second test pad, a second test lead, a third test pad and a switch control line. Numbers of the switch units, the first test leads and the first test pads are the same; each of the first test leads is electrically connected to a corresponding one of the display panels; each of the first test pads is electrically connected to an output terminal of the corresponding switch unit, and each of the first test pads is electrically connected to the corresponding first test lead; the second test pad and the second test lead are electrically connected to input terminals of the switch units; and the third test pad and the switch control line are electrically connected to control terminals of the switch units.