Liquid Crystal Display ESD Protection via Peripheral Wiring
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Solution Overview
Problem
Traditional liquid crystal displays (LCDs) without a front frame face challenges in electrostatic discharge (ESD) protection due to the absence of discharge paths on all sides, leading to increased manufacturing costs and reduced yields, as well as potential display failures when ESD enters the driver IC.
Innovation Solution
Incorporating a second wiring on the thin-film transistor array substrate that extends along the outer periphery of the liquid crystal panel to create a discharge path for ESD, independent of the ground wiring, which reduces the need for shielding tapes and prevents ESD from reaching the driver IC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shielding tapes are bonded to all sides of the liquid crystal panel, then ESD protection is improved, but manufacturing cost increases and yields decrease
Solution Approach 1:
The invention extracts the ESD protection function from the shielding tape and transfers it to the liquid crystal panel itself by forming conductive patterns (ground wiring and outer peripheral wiring) directly on the panel substrates. This eliminates the need for separate shielding tapes while maintaining ESD protection capability.
Solution Approach 2:
The invention merges the ESD protection function with the existing ground wiring system of the liquid crystal panel. By integrating outer peripheral wiring that connects to ground potential into the panel structure, the ESD protection capability is combined with the panel's existing electrical infrastructure, eliminating the need for separate shielding components.
2Reliability
If shielding tapes are bonded to all sides of the liquid crystal panel, then ESD protection is improved, but manufacturing complexity increases
Solution Approach 1:
The invention removes the shielding tape component entirely and transfers its ESD protection function to integrated wiring patterns formed on the liquid crystal panel substrates during the manufacturing process.
Solution Approach 2:
The outer peripheral wiring serves multiple functions: it provides ESD protection by offering a discharge path to ground potential, and it also serves as part of the panel's electrical infrastructure. This multi-functionality eliminates the need for separate shielding components.
3Ease of manufacture
If ground wiring is used as discharge path, then shielding tapes are reduced, but ESD enters driver IC causing display failure
Solution Approach 1:
The invention segments the wiring into two distinct functional paths: ground wiring for normal electrical operations and outer peripheral wiring specifically for ESD discharge. This segmentation ensures that ESD current follows a dedicated external path away from the driver IC while ground wiring handles regular signaling.
Solution Approach 2:
The outer peripheral wiring acts as an intermediary discharge path that intercepts ESD current before it can reach the driver IC. This intermediary wiring provides a safe external route for ESD energy dissipation, protecting the driver IC from electrostatic damage.
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 solution effectively secures a discharge path for ESD on all sides of the liquid crystal panel, lowering manufacturing costs, improving yields, and preventing display failures by reducing the number of shielding tapes required and ensuring the driver IC is protected from ESD.
Implementation Method 1
the drive IC can be protected from electrostatic discharge (ESD)... a conductive tape (hereinafter referred to as the 'shielding tape') bonded to the liquid crystal panel in order to protect the driver IC from ESD
Implementation Method 2
the shielding tape also protects, in many cases, the electronic components... If the shielding tapes are bonded to all sides of the liquid crystal panel in the LCD having no front-frame structure, the discharge paths for ESD can be secured on all sides of the liquid crystal panel
Data Source
AI summary
A liquid crystal panel includes a TFT array substrate and a color filter substrate that includes a transparent conductive film (CF transparent conductive film) formed on a surface thereof. The TFT array substrate includes ground wiring that is connected to the CF transparent conductive film and supplies the CF transparent conductive film with a ground potential and CF ground checking wiring that is connected to the transparent conductive film independently of the ground wiring. The CF ground checking wiring extends along an outermost periphery portion on at least one side of the TFT array substrate.