Narrow Frame LCD ESD Protection via Projection Structure
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Solution Overview
Problem
Liquid crystal display apparatuses with narrow frames are prone to display defects due to electrostatic discharge (ESD) caused by the exposure of transparent conductive layers during manufacturing, leading to charging issues that can result in defects in the display region.
Innovation Solution
Incorporating a capacitance element with a first and second capacitance electrode and a dielectric layer between them, along with a projection structure that connects the second transparent conductive layer to the first transparent conductive layer, effectively channels electric charges away from the display region, preventing ESD-induced defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the sealing portion width is decreased to achieve a narrower frame, then the frame width is reduced and display region is widened, but the transparent conductive layer becomes exposed in the peripheral region which leads to ESD charging and display defects
Solution Approach 1:
A projection structure is introduced as an intermediary component between the first and second transparent conductive layers. This projection structure provides a controlled connection path that allows charge dissipation without requiring a wide sealing portion, thus maintaining the narrow frame design while preventing ESD-related display defects
Solution Approach 2:
The solution moves from a two-dimensional planar connection to a three-dimensional structure by adding a projection that extends vertically between substrates. This vertical dimension allows the transparent conductive layers to be connected through the projection structure, enabling charge dissipation paths that do not compromise the narrow frame aesthetic
2Reliability
If the third section of the second transparent conductive layer is extended to contact the first transparent conductive layer, then charge dissipation path is established, but the device structure becomes more complex
Solution Approach 1:
The projection structure is formed by merging existing manufacturing processes and materials (such as utilizing the color filter layer or black matrix material) rather than introducing entirely new components. This integration approach establishes charge dissipation paths while minimizing additional structural complexity
Solution Approach 2:
The projection structure serves multiple functions simultaneously: it acts as a structural support element, provides a charge dissipation path, and can be formed from materials already present in the display stack (such as the color filter layer). This multi-functionality reduces overall device complexity while achieving the desired charge management
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 solution effectively suppresses display defects by ensuring that electric charges accumulated in the transparent conductive layers are managed within the capacitance element, thereby preventing ESD from affecting the display region, thus enhancing the reliability of liquid crystal display apparatuses with narrow frames.
Implementation Method 1
a capacitance element disposed at an outer side of the sealing portion or disposed at least partially overlapping with the sealing portion in a view from a normal direction of the first substrate, the capacitance element including a first capacitance electrode included in the first transparent conductive layer, a second capacitance electrode disposed opposing the first capacitance electrode between the first capacitance electrode and the first substrate, and a dielectric layer located between the first capacitance electrode and the second capacitance electrode
Data Source
AI summary
A liquid crystal display apparatus includes an active matrix substrate, a counter substrate opposing the active matrix substrate, a liquid crystal layer provided between the active matrix substrate and the counter substrate, and a sealing portion that surrounds the liquid crystal layer. The active matrix substrate includes a first substrate and a first transparent conductive layer. The counter substrate includes a second substrate and a second transparent conductive layer. The active matrix substrate further includes a capacitance element that is disposed at an outer side of the sealing portion or disposed at least partially overlapping with the sealing portion. One of the active matrix substrate and the counter substrate further includes a projection structure. A section of the second transparent conductive layer present at an outer side of the sealing portion is in contact with the first transparent conductive layer on a top face of the projection structure.