Liquid Crystal Display Gate Pad Repair Method
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Solution Overview
Problem
In liquid crystal displays, defective gate driving integrated circuits require replacement, leading to reduced yield and increased manufacturing costs, as the anisotropic conductive film (ACF) becomes hard and difficult to detach, potentially damaging the gate pads and requiring chemical removal of residual ACF, complicating the repair process.
Innovation Solution
A method involving a liquid crystal panel with signal and repair pad parts, where defective gate driving circuits are disconnected by opening signal links and replaced with a repair driving circuit, avoiding the need for heat or physical force and chemical removal of residual ACF, thus preventing damage and simplifying the repair process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ACF is used to bond the gate driving integrated circuit to the gate pads, then the circuit is electrically connected, but the ACF becomes hard after curing and cannot be easily detached, potentially damaging the gate pads
Solution Approach 1:
The bonding structure is segmented into two distinct parts: the ACF for electrical connection and the gate pad structure with protrusions for mechanical anchoring. This segmentation allows the ACF to be replaced without damaging the gate pads, as the protrusions remain intact on the substrate.
Solution Approach 2:
The gate pad structure is pre-formed with protrusions before the ACF bonding process. This preliminary action creates a mechanical anchor that remains on the substrate after ACF removal, enabling future repairs without damage to the gate pads.
2Ease of repair
If heat and physical force are used to detach the ACF from the gate pads, then the defective circuit can be removed, but the gate pads may be damaged and chemical removal is required
Solution Approach 1:
The ACF is extracted as a separate, replaceable component from the bonding structure. The gate pad protrusions remain on the substrate while the ACF and defective circuit are removed together as a unit, eliminating the need for harmful chemical removal processes.
Solution Approach 2:
The ACF is treated as a disposable component that can be easily replaced. Instead of designing for permanent bonding, the system accepts that the ACF will be removed and replaced, making the repair process simple and damage-free.
3Ease of repair
If the ACF is detached using heat and physical force, then the defective circuit can be removed, but residual ACF must be removed using chemical products, complicating the process
Solution Approach 1:
The ACF is designed as a disposable component that is completely removed along with the defective circuit. This eliminates the need for additional chemical removal steps, simplifying the repair process to just replacement without residual cleanup.
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
This method allows for easy repair of defective gate driving circuits without damaging the liquid crystal panel, enhancing yield and simplifying the process by eliminating the need for heat, physical force, and chemical removal, thereby reducing costs and complexity.
Implementation Method 1
the ACF 24 electrically connects the gate pads and the data pads to the gate driving integrated circuits and the data driving integrated circuits respectively by thermocompression
Data Source
AI summary
A method for repairing a liquid crystal display. The method includes preparing a liquid crystal panel including a signal pad part and a repair pad part connected to signal lines; testing a driving circuit connected to the signal pad part on the liquid crystal panel; opening signal links connecting the signal lines and the signal pad part, connected to the driving circuit, if the driving circuit is detected in a defect as a result of the test; and mounting a repair driving circuit to be connected to the repair signal pad part on the liquid crystal panel.