Display Panel Dummy Capacitance Layout for Shift Register Defects
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Solution Overview
Problem
The manufacturing yield of active matrix display panels using the gate driver monolithic (GDM) technique is compromised due to defects such as dielectric breakdown in the capacitance elements, leading to increased costs and reduced designability.
Innovation Solution
Incorporating a dummy capacitance portion with parallel capacitance elements and connection portions in the peripheral region of the display panel, allowing for disconnection of faulty connections to isolate defective elements and prevent further damage, thereby correcting defects and maintaining panel functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dummy capacitance portion with multiple capacitance elements is provided in the peripheral region, then the operational stability of the shift register is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The dummy capacitance portion is segmented into multiple independent capacitance elements (first capacitance element, second capacitance element, third capacitance element, fourth capacitance element) connected in parallel. Each element can be independently controlled through separate connection portions, allowing selective disconnection of defective elements while maintaining functionality of other elements. This segmentation resolves the contradiction by improving reliability through redundancy while managing complexity through modular design.
Solution Approach 2:
The connection portions connecting the capacitance elements to the dummy stage are designed to be dynamically controllable, enabling selective disconnection of defective capacitance elements. This dynamic control allows the system to adapt to defects by isolating problematic elements while maintaining operation of functional elements, thus improving operational stability without permanently increasing device complexity.
2Ease of repair
If multiple connection portions are provided for capacitance elements, then defect correction capability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The connection structure is segmented into multiple independent connection portions (first connection portion, second connection portion, third connection portion, fourth connection portion), each connecting a specific capacitance element to the dummy stage. This segmentation enables selective disconnection of defective elements through laser irradiation or other cutting methods applied to individual connection portions, improving ease of repair while reducing manufacturing precision requirements compared to a single integrated connection structure.
Solution Approach 2:
The defective capacitance element and its associated connection portion can be extracted or disconnected from the overall dummy capacitance portion without affecting other elements. This extraction capability allows defect correction by isolating problematic components while maintaining the integrity and functionality of the remaining capacitance elements, thus improving ease of repair.
3Adaptability or versatility
If the frame width is reduced by integrating the gate driver circuit, then the designability and functionality are improved, but the manufacturing yield decreases due to defects
Solution Approach 1:
The dummy capacitance portion with multiple redundant capacitance elements serves as beforehand cushioning against manufacturing defects. If a defect occurs in one capacitance element, the other elements continue to function, cushioning the impact on overall device performance and maintaining manufacturing yield. This prior cushioning through redundancy resolves the contradiction between frame narrowing and manufacturing yield.
Solution Approach 2:
The capacitance values of the individual capacitance elements can be adjusted to optimize performance while maintaining the overall dummy capacitance function. By changing parameters such as capacitance values and connection configurations, the system can compensate for manufacturing variations and defects, thereby maintaining high manufacturing yield while achieving frame narrowing through GDM integration.
Data Source
AI summary
A display panel includes a display region defined by a plurality of pixels P and a peripheral region other than the display region. The display panel includes a gate drive circuit and a dummy capacitance portion in the peripheral region. The gate drive circuit includes a shift register. The dummy capacitance portion includes a plurality of capacitance elements connected in parallel and connected to a dummy stage. Each of the plurality of capacitance elements includes a first capacitance electrode, a second capacitance electrode, and a dielectric layer positioned between the first capacitance electrode and the second capacitance electrode. The dummy capacitance portion further includes at least one first connection portion with two ends respectively connected to the first capacitance electrode of any one of the plurality of capacitance elements and to the first capacitance electrode of any other one of the plurality of capacitance elements.