Shielding Tape Segmentation for LCD Backlight Light Damage
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Solution Overview
Problem
Liquid crystal display devices face issues with the amorphous silicone gate (ASG) circuit being damaged due to direct light exposure and optical sheets curling from temperature and moisture changes, which affect the reliability and functionality of the backlight assembly.
Innovation Solution
A backlight assembly is designed with a shielding tape that extends from the mold frame to the optical sheet, blocking light from reaching the ASG circuit and maintaining a gap to prevent contact with the optical sheet, thereby preventing light-induced malfunctions and curling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the shielding tape is attached to the mold frame using adhesive, then the shielding tape can block light from reaching the ASG circuit, but the adhesive may cause the optical sheet to curl due to temperature and moisture changes
Solution Approach 1:
The shielding tape is divided into two distinct portions: a first portion with adhesive for attachment to the mold frame, and a second portion without adhesive that extends over the optical sheet. This segmentation allows the tape to provide light shielding functionality while the adhesive portion remains isolated from the optical sheet, preventing curling issues.
Solution Approach 2:
The shielding tape acts as an intermediary element between the light source and the ASG circuit, blocking harmful light while the adhesive serves as a separate intermediary for attachment. The non-adhesive portion of the tape extends over the optical sheet without contacting it, preventing direct interaction that would cause curling.
2Object-affected harmful factors
If the shielding tape extends to contact the optical sheet, then light blocking is improved, but the optical sheet may curl due to temperature and moisture changes
Solution Approach 1:
The shielding tape is segmented into adhesive and non-adhesive portions, with the non-adhesive portion extending over the optical sheet without contact. This segmentation maintains light blocking effectiveness while preventing the tape from inducing stress on the optical sheet that would cause curling.
Solution Approach 2:
The adhesive property is extracted from the entire shielding tape and confined to only the first portion. The second portion is specifically designed without adhesive to extend over the optical sheet, separating the attachment function from the light blocking function to prevent optical sheet curling.
3Reliability
If the shielding tape is made with adhesive for secure attachment, then the light blocking function is effective, but the adhesive may damage the optical sheet through temperature and moisture
Solution Approach 1:
The shielding tape is segmented into two functional portions: the first portion with adhesive for secure attachment to the mold frame, and the second portion without adhesive that extends over the optical sheet. This segmentation ensures reliable attachment while preventing adhesive contact with the optical sheet.
Solution Approach 2:
Different portions of the shielding tape have different properties: the first portion has adhesive for attachment, while the second portion is non-adhesive to protect the optical sheet. This local differentiation of properties allows the tape to fulfill both attachment and protection functions simultaneously.
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 prevents light from reaching the ASG circuit, ensuring reliable operation and preventing the optical sheet from curling, thus enhancing the stability and performance of the liquid crystal display device.
Implementation Method 1
The shielding tape may be attached to the mold frame by using an adhesive
Implementation Method 2
an optical sheet disposed on the upper surface of the light guide plate and for diffusing and collimating the light
Implementation Method 3
an optical sheet disposed on the upper surface of the light guide plate and for diffusing and collimating the light
Implementation Method 4
a shielding tape for contacting the upper surface of the mold frame and extending from the mold frame to one side of the optical sheet
Data Source
AI summary
A backlight assembly and a liquid crystal display device including the backlight assembly are disclosed. In one embodiment, the backlight assembly includes a light guide plate configured to guide light, emitted from a light source, to a liquid crystal display panel and an optical sheet disposed on an upper surface of the light guide plate and configured to diffuse and collimate the light. The backlight assembly further includes a frame configured to support the liquid crystal display panel and the light guide plate and a shielding tape connected to an upper surface of the frame and extending from the frame to one side of the optical sheet.