Light Emitting Panel Repair Bridge Isolates Parasitic Capacitance
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Solution Overview
Problem
Pixel defects in light emitting panels due to transistor and capacitor deviations or wire disconnections lead to reduced display quality, necessitating a method to repair defective pixels without affecting surrounding pixels.
Innovation Solution
A light emitting display device with a repair line, repair pixel circuit, bridge, and connecting portion that minimizes interference with adjacent pixels by using parasitic capacitances and voltage control to isolate the repair process, ensuring the display quality of surrounding pixels is maintained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a repair line is introduced to repair defective pixels, then the reliability of the light emitting panel is improved, but the display quality of surrounding pixels may deteriorate due to interference from the repair line
Solution Approach 1:
A bridge structure is introduced as an intermediary element between the repair line and the anode. This bridge includes a first parasitic capacitance with the repair line and a second parasitic capacitance with the anode, acting as a mediator that isolates the repair line from directly affecting the anode and surrounding pixels. The bridge structure enables repair current to be supplied while preventing harmful interference signals from propagating to functional pixels.
Solution Approach 2:
The electrical connection path is segmented into distinct sections: the repair line, the bridge structure with parasitic capacitances, and the anode. By dividing the connection path and introducing the bridge as a separate segment with controlled parasitic capacitance, the repair function is isolated from the display function, preventing interference while maintaining repair capability.
2Ease of repair
If the bridge is electrically connected to the repair line and anode, then the repair current can be transmitted, but the parasitic capacitance causes voltage fluctuations that affect display quality
Solution Approach 1:
The parasitic capacitance values of the bridge are carefully controlled and optimized as key parameters. By adjusting the capacitance values (first parasitic capacitance with repair line, second parasitic capacitance with anode), the system achieves optimal balance between allowing repair current transmission and minimizing voltage fluctuations that would affect display quality. This parameter optimization reduces interference while maintaining repair functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces interference between the repair line and adjacent pixels, preventing deterioration of display quality and allowing for the repair of defective pixels without compromising the performance of surrounding pixels.
Implementation Method 1
The bridge may have a first parasitic capacitance with the repair line, and a second parasitic capacitance with the connecting portion.
Data Source
AI summary
A light emitting display device includes: a light emitting diode at a display area, and including an anode and a cathode; a pixel circuit at the display area, and to transmit an output current to the anode of the light emitting diode; a repair line extending in a first direction; a repair pixel circuit connected to the repair line; a bridge including one end overlapping with the repair line; and a connecting portion connected to the anode, and including one end overlapping with the bridge. The bridge is not connected to the repair line, the connecting portion, and the anode.