Conductive Bonding Member Grounding LCD Panel
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Solution Overview
Problem
Conductive tape connections in liquid crystal display devices are inefficient due to small contact areas and require special shaping of polarizing plates, leading to unreliable ground connections.
Innovation Solution
A display device configuration with a conductive bonding member electrically connected to a conductive layer on the substrate and polarizing plate, providing a stable ground connection and shielding, while allowing for a standard polarizing plate shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive tape is disposed along the shape of steps to connect conductive film and polarizing plate, then ground connection is achieved, but workability is poor and contact area is small
Solution Approach 1:
The invention divides the grounding function into two parts: a conductive layer formed on the substrate surface that provides large-area contact, and a conductive tape that provides vertical electrical connection. This segmentation allows each component to optimize its function - the conductive layer ensures large contact area while the conductive tape ensures reliable electrical connection, resolving the contradiction between workability and connection reliability.
Solution Approach 2:
The conductive layer acts as an intermediary between the substrate and the conductive tape. Instead of directly connecting the conductive tape to the conductive film (which requires complex stepwise positioning), the conductive layer provides a simplified interface that enables easy connection while maintaining large contact area, thus improving workability without sacrificing connection reliability.
2Reliability
If conductive tape is used to connect conductive film and polarizing plate, then ground connection is established, but contact area between tape and conductive elements is small
Solution Approach 1:
The invention transitions from a one-dimensional point-contact connection (conductive tape directly to conductive film) to a two-dimensional area contact (conductive layer on substrate surface). This dimensional expansion allows the conductive tape to connect to an extended conductive region rather than a small point, significantly increasing contact area while maintaining connection reliability.
3Reliability
If polarizing plate is processed in special shape to connect conductive tape, then connection is achieved, but manufacturing complexity increases
Solution Approach 1:
The invention extracts the grounding function from the polarizing plate by providing a separate conductive layer on the substrate. This allows the polarizing plate to maintain its standard rectangular shape without complex cutouts or special processing, while the grounding function is achieved through the conductive layer and conductive tape assembly, thereby reducing manufacturing precision requirements.
Solution Approach 2:
The conductive layer serves as an intermediary that provides the grounding function without requiring modification of the polarizing plate. This mediator approach allows the polarizing plate to remain in its simple standard shape while still achieving reliable ground connection through the conductive layer interface, eliminating the need for special shape processing.
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
Enhances connection reliability and simplifies the grounding process, reducing the risk of noise interference with touch panels and improving display quality by blocking leaked light.
Implementation Method 1
a conductive bonding member electrically connected to the conductive layer and bonding the lighting device and the display panel and connected to ground
Data Source
AI summary
A liquid crystal display device 10 includes a backlight device 12 exiting light, a liquid crystal panel 11 disposed on a light exit side with respect to the backlight device 12, a first conductive layer 31, and a conductive bonding member 32. The liquid crystal panel 11 includes an array substrate 11b, a CF substrate 11a overlapping the array substrate 11b on an opposite side from the backlight device 12 side, and a first polarizing plate 11d disposed on the backlight device 12 side with respect to the array substrate 11b. The first conductive layer 31 is disposed on a plate surface of one of the array substrate 11b and the first polarizing plate 11d. The conductive bonding member 32 is electrically connected to the first conductive layer 31 to bond the backlight device 12 and the liquid crystal panel 11 and connected to ground.