Display Panel Cathode Line Segmentation for Defect Repair
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Solution Overview
Problem
Existing display panels face challenges in efficiently repairing defects, particularly in organic light-emitting diode (OLED) and light-emitting diode (LED) based systems, which can lead to dark points and reduced luminance.
Innovation Solution
A display panel design that includes a pixel structure with multiple light-emitting elements per sub-pixel, along with a repair method that involves electrically separating defective cathode electrodes and reconnecting cathode lines to maintain panel functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple light-emitting elements are used per sub-pixel to improve luminance and reliability, then the display panel's luminance and reliability are improved, but the device complexity and difficulty of repair increase
Solution Approach 1:
Each sub-pixel is divided into multiple light-emitting elements (first light-emitting element and second light-emitting element), allowing independent control and repair of individual elements. The cathode lines are also segmented into first cathode line and second cathode line that can be independently connected or disconnected during repair operations.
Solution Approach 2:
The patent implements dynamic reconfigurability by providing switch transistors that can dynamically connect or disconnect light-emitting elements and cathode lines during repair mode. This allows the display panel to transition between normal operation mode and repair mode, enabling flexibility in handling defects without permanent structural changes.
2Illumination intensity
If multiple light-emitting elements are used per sub-pixel to maintain high luminance, then luminance is improved, but the ease of repair deteriorates
Solution Approach 1:
The display panel is pre-configured with multiple cathode lines (first cathode line and second cathode line) and switch transistors that enable preliminary repair preparation. When a defect is detected, the system can immediately switch to repair mode by activating pre-positioned repair pathways, avoiding the need for complex on-site modifications.
Solution Approach 2:
Switch transistors serve as intermediary components that mediate between the light-emitting elements and cathode lines during repair operations. These intermediaries allow selective connection or disconnection of specific elements, enabling precise repair without affecting other functional components.
3Ease of repair
If cathode lines are extended and overlapped between sub-pixels to enable repair flexibility, then the ease of repair is improved, but the device complexity increases
Solution Approach 1:
The first cathode line and second cathode line are merged in overlapping regions, allowing shared infrastructure for multiple sub-pixels. This merging reduces the total number of independent cathode lines needed while maintaining the ability to selectively activate specific lines during repair operations.
Solution Approach 2:
The extended and overlapped cathode lines serve multiple functions: they act as common cathode connections during normal operation and as separate repair pathways when defects occur. This multi-functionality allows the same structural elements to support both operational and repair modes without requiring dedicated components for each function.
Data Source
AI summary
The present disclosure relates to a display panel and its repair method. The display panel may include: a first sub-pixel including a first-first light-emitting element and a first-second light-emitting element; a second sub-pixel including a second-first light-emitting element and a second-second light-emitting element; a first cathode line connected to at least one cathode electrode among a cathode electrode of the first-first light-emitting element and a cathode electrode of the first-second light emitting element, and extended toward the second sub-pixel; and a second cathode line connected to at least one cathode electrode among a cathode electrode of the second-first light-emitting element and a cathode electrode of the second-second light emitting element, and extended toward the first sub-pixel.