Conductive Tape Connection for Slimmed LCD Frame
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Solution Overview
Problem
Conduction defects and reliability issues in the electrical connection structure of liquid crystal display apparatuses, particularly in slimmed frames, due to reduced adhesion area and precise positioning challenges with conductive tapes, leading to takt up problems and light leakage.
Innovation Solution
A liquid crystal display apparatus with a color filter substrate having an anti-static transparent conductive layer and a light shield layer on one surface, and a TFT substrate with a projecting part and earth pad, where a conductive tape connects the anti-static transparent conductive layer and earth pad, with a notch in the light shield layer for light transmission and precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the frame is slimmed to achieve a thinner apparatus, then the apparatus thickness is reduced, but the adhesion area of the conductive tape is reduced leading to conduction defects
Solution Approach 1:
The light shield layer is segmented by forming a notch that divides it into regions, creating a dedicated connection area for the conductive tape. This segmentation allows the conductive tape to be positioned precisely in the notch region, ensuring adequate adhesion area even when the overall frame is slimmed. The notch creates a localized zone that is optimized for electrical connection without requiring the entire frame to be larger.
Solution Approach 2:
The notch is formed in the light shield layer before the conductive tape is applied. This preliminary action prepares the connection area in advance, ensuring that when the conductive tape is subsequently positioned and adhered, it has a predetermined adequate adhesion area. This pre-prepared structure eliminates the need for larger frame dimensions to ensure proper tape adhesion.
2Length of moving object
If the frame is slimmed to achieve a thinner apparatus, then the apparatus thickness is reduced, but precise positioning of the conductive tape becomes more difficult causing takt up
Solution Approach 1:
The notch is formed in advance in the light shield layer to serve as a positioning guide for the conductive tape. This preliminary structuring provides clear visual and physical boundaries that facilitate precise and rapid positioning of the conductive tape during assembly, eliminating the need for complex positioning procedures and reducing production time.
Solution Approach 2:
The notch acts as an intermediary structure that mediates between the light shield layer and the conductive tape. It provides a defined interface that simplifies the positioning process by offering clear alignment references, making the connection process more efficient and less prone to errors even in slimmed frame designs.
3Reliability
If conductive paste is applied to connect the shield layer and earth pad, then the connection is achieved, but the apparatus becomes thicker and the frame is larger
Solution Approach 1:
The invention uses a conductive tape with adhesive, which is a simpler and thinner connection method compared to conductive paste application. The tape provides sufficient electrical connection stability while being much thinner, allowing the apparatus to achieve a slimmed profile without sacrificing connection reliability. The adhesive-backed tape is applied directly and cured, eliminating the need for thick paste layers.
4Strength
If an anisotropic conductive film is used for thermal compression connection, then strong connection is achieved, but the process complexity increases and takt time increases
Solution Approach 1:
The invention uses a simple adhesive-backed conductive tape that can be applied directly to the connection surfaces. This eliminates the need for complex thermal compression processes and specialized anisotropic conductive films. The tape provides adequate connection strength for the application while significantly simplifying the manufacturing process and reducing equipment requirements.
Solution Approach 2:
The conductive tape includes self-adhesive properties that allow it to bond to the light shield layer and earth pad without requiring external compression equipment or thermal processing. The tape's adhesive layer activates under simple pressure and temperature conditions, enabling the connection to be made with basic assembly equipment rather than complex thermal compression systems.
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 configuration ensures a stable electrical connection between conductive layers on transparent substrates, improving reliability and productivity by simplifying the connection process and allowing optical inspection for correct adhesion, thus preventing conduction defects and achieving a slimmer, more reliable frame.
Implementation Method 1
a conductive tape, which is stuck from an upper part of the color filter substrate to an upper part of the TFT substrate, which is connected to both the anti-static transparent conductive layer and the earth pad to electrically connect the anti-static transparent conductive layer and the earth pad
Implementation Method 2
a light shield layer that shields light in a frame area arranged outside the display area on a second surface, which is opposite to the first surface; the light shield layer has a notch having an opening at the end side of the color filter substrate
Data Source
AI summary
A liquid crystal display apparatus includes: a color filter substrate including a first transparent, which has: an anti-static transparent conductive layer; and a light shield layer that shields light; a TFT substrate including a second transparent substrate facing the color filter substrate, and which has: a projecting part that projects beyond an end face of the color filter substrate; a conductive tape, which is stuck from an upper part of the color filter substrate to an upper part of the TFT substrate, wherein the light shield layer has a notch having an opening at the end side of the color filter substrate, wherein the conductive tape is arranged adjacent to or partially overlapping with the light shield layer, wherein the notch is provided at a connection part, and wherein a light transmission part capable of light transmitting is provided to the connection part.