Display Panel Pixel Circuit Layout for Aperture Ratio and Laser Repair
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Solution Overview
Problem
Existing display technologies face challenges in increasing the aperture ratio of organic light-emitting displays due to the design constraints imposed by pixel circuits and connected lines, and there is a need for a method to repair defective pixels.
Innovation Solution
A display panel design that includes a power line, a reference voltage line, and a branch line with a metalized semiconductor layer, along with a repair method using laser irradiation to disconnect defective branch lines, enhancing the aperture ratio and enabling pixel repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If traditional metal lines are used for reference voltage lines and branch lines, then electrical conductivity is ensured, but the aperture ratio of pixels cannot be increased due to line design constraints
Solution Approach 1:
The patent changes the material parameter of the branch line from traditional metal to metalized semiconductor layer, altering the electrical and optical properties to simultaneously achieve high conductivity and transparency for increased aperture ratio
Solution Approach 2:
The patent uses a composite structure consisting of a semiconductor layer metalized by laser irradiation, combining the transparency advantages of semiconductor materials with the conductivity advantages of metal materials
2Reliability
If more branch lines are added to supply reference voltage to pixel circuits, then electrical performance is improved, but the aperture ratio is reduced due to increased line coverage
Solution Approach 1:
The patent changes the optical parameter of the conductive line by metalizing the semiconductor layer, transforming it from opaque to transparent, thereby reducing the visual obstruction of multiple branch lines while maintaining electrical performance
3Reliability
If defective pixels are repaired by replacing the entire display panel, then reliability is restored, but manufacturing cost and time are significantly increased
Solution Approach 1:
The patent extracts the functional capability to create conductive patterns directly onto the display panel through laser irradiation, enabling in-field repair of defective pixels without requiring panel replacement or complex external equipment
Solution Approach 2:
The patent enables the display panel to repair itself by using laser irradiation to metalize semiconductor layers and restore conductive lines, eliminating the need for external repair equipment or panel replacement
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 design increases the aperture ratio by optimizing line configurations and allows for effective repair of defective pixels, improving display performance and reliability.
Implementation Method 1
irradiating a laser beam without changing a wavelength of the laser beam to disconnect a branch line and an anode of a light-emitting element
Data Source
AI summary
Discussed is a display panel including a plurality of pixel circuits on a substrate. Each pixel circuit includes a driving element configured to drive a light-emitting element, a light-shield metal layer disposed below the driving element, and a first capacitor and a second capacitor electrically connected in parallel between the light-shield metal layer and a gate electrode of the driving element.