Repair Pixel Circuits for Display Panel Malfunction Bypass
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Solution Overview
Problem
Large-sized organic light emitting display devices face challenges in manufacturing yield and require effective methods to address malfunctions and data line cuts, which existing technologies have not adequately resolved.
Innovation Solution
A display panel design that includes repair pixel circuits and lines extending in a horizontal direction, allowing for the supply of repair data voltage to generate repair drive currents and bypass malfunctions or data line cuts by electrically coupling repair lines and data lines to maintain organic light emitting diode functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repair data lines extend in the first direction (horizontal) with greater length, then repair drive current can be supplied to malfunctioning pixels, but the load on the display panel increases
Solution Approach 1:
The repair data line is divided into multiple segments, with each segment extending in the first direction (horizontal) only where necessary to reach malfunctioning pixel circuits. The line includes extension portions that extend in the second direction (vertical) to connect to different scan lines, allowing the repair function to be distributed across multiple segments rather than requiring a single long continuous line, thereby reducing overall power consumption while maintaining repair capability.
Solution Approach 2:
The repair data line structure is optimized locally by extending portions in the first direction only at specific locations where malfunctioning pixel circuits are detected. The extension portions extend in the second direction to connect to specific scan lines, allowing the repair function to be activated only where needed rather than across the entire display panel, thus reducing overall power consumption while maintaining reliability.
2Productivity
If repair pixel circuits are added to handle malfunctions, then manufacturing yield is improved, but device complexity increases
Solution Approach 1:
The repair pixel circuits are designed to perform multiple functions: they can detect malfunctioning pixel circuits, generate repair drive currents, and supply these currents through repair data lines to the malfunctioning pixels. This multi-functionality allows a single additional circuit element to handle multiple aspects of the repair process, improving manufacturing yield without proportionally increasing device complexity.
Solution Approach 2:
The repair pixel circuits act as intermediary elements between the normal pixel circuits and the malfunctioning pixel circuits. They receive data voltages from repair data lines, process them to generate appropriate repair drive currents, and supply these currents to malfunctioning pixels through repair lines, thereby mediating the repair process without requiring direct modification of the original pixel circuit structure.
3Reliability
If repair lines are extended to reach cut data lines, then data transmission is restored, but the load on the display panel increases
Solution Approach 1:
When a data line is cut, the repair data line extends in the second direction (vertical) to reach the cut portion from a different spatial dimension. Instead of extending horizontally along the same line, the repair line uses the vertical dimension to bypass the cut section and reconnect data transmission, thereby restoring reliability without requiring excessive horizontal extension that would increase power consumption.
Data Source
AI summary
A display panel includes scan lines, data lines, organic light emitting diodes, pixel circuits configured to supply drive currents, and electrically coupled to the scan lines and the data lines, repair pixel circuits configured to generate repair drive currents when there is a malfunctioning pixel circuit, repair lines, and repair data lines, wherein a corresponding repair pixel circuit corresponds to the malfunctioning pixel circuit, and is configured to generate the repair drive current based on a repair data voltage from a corresponding repair data line, wherein the repair drive current is configured to be supplied to a corresponding organic light emitting diode that corresponds to the malfunctioning pixel circuit through a corresponding repair line that corresponds to the malfunctioning pixel circuit, and wherein a portion of the repair data lines that extends in the first direction is longer than a portion that does not extend in the first direction.