OLED Pixel Circuit Standby Driving for Bright Spot Repair
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Solution Overview
Problem
Current OLED display panels face issues with bright spots due to design and process stability problems, leading to inefficient repair methods that damage pixels and reduce panel quality and yield rate, especially when pixel sizes reach the nanometer level.
Innovation Solution
A pixel circuit comprising a main driving circuit, standby driving circuit, light emitting circuit, fusing circuit, fusing control circuit, and switching circuit, which allows for controlled disconnection and reconnection of driving currents to address always-on defects without damaging pixels, enabling the standby driving circuit to take over and maintain panel functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser cutting solution is used to turn off pixel points after bright spot position is determined, then bright spot problem is solved, but pixel is damaged and panel quality and yield rate decrease
Solution Approach 1:
The pixel circuit is segmented into two independent driving circuits: a main driving circuit and a standby driving circuit. Each circuit can independently control the light emitting circuit. When the main driving circuit produces a bright spot defect, the switching circuit disconnects the defective main driving circuit and connects the standby driving circuit to the light emitting circuit, thereby repairing the pixel without physical damage.
Solution Approach 2:
The invention changes the operational state of the driving circuits by controlling the switching circuit to transition between connecting the main driving circuit and the standby driving circuit to the light emitting circuit. This parameter change (switching between circuit paths) enables repair of bright spot defects without damaging the pixel structure.
2Manufacturing precision
If laser repair method is used on nanometer-level pixels, then repair attempt is made, but repair becomes impossible and dead pixels increase
Solution Approach 1:
The pixel circuit is divided into independent main and standby driving circuits with a switching mechanism. This segmentation allows the standby circuit to take over when the main circuit fails, providing a repair mechanism that works effectively at nanometer-level pixel sizes where traditional laser repair becomes impossible.
3Productivity
If main driving circuit is always connected to light emitting circuit, then normal operation is maintained, but always-on defects cannot be resolved
Solution Approach 1:
The switching circuit dynamically changes the connection state between driving circuits and the light emitting circuit based on operational needs and defect conditions. The circuit can transition from a static always-connected state to a dynamic state where the standby driving circuit is activated when defects occur, resolving always-on defects while maintaining productivity.
4Reliability
If standby driving circuit is added to the pixel circuit, then always-on defects can be resolved and yield rate increases, but device complexity increases
Solution Approach 1:
The main driving circuit and standby driving circuit are merged into a single pixel circuit structure through the switching circuit. This combining approach allows defect resolution capability to be added while sharing common components such as the light emitting circuit, scanning signal line, and data signal line, thereby limiting the increase in overall device complexity.
Data Source
AI summary
A pixel circuit and a driving method, a display device. The pixel circuit includes: a main driving circuit, configured to, under control of a scanning signal line and a data signal line, output a main driving current signal to a fusing circuit; the fusing circuit configured to enable a light emitting circuit and the main driving circuit to be disconnected from each other; a fusing control circuit configured to, under control of a signal input terminal, enable the light emitting circuit and the main driving circuit to be disconnected from each other; a standby driving circuit configured to output a standby driving current signal to a switching circuit; the switching circuit configured to, under control of an input signal of a control line, connect the standby driving circuit to the light emitting circuit; and the light emitting circuit configured to emit light by using the standby driving current signal.