Notched Fixing Tape for Display Optical Sheet Air-Lock Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In liquid crystal display devices, the deflection of optical sheets due to air-lock and thermal expansion can lead to luminance unevenness and the appearance of Newton's rings, exacerbated by the reduction in thickness of the gap between the optical sheet and the liquid crystal panel.
Innovation Solution
A fixing tape with notched portions is used to bond the peripheral edges of the optical sheet and the display panel or frame, creating air passages to prevent air-lock and deflection, while also functioning as a light-shielding double-sided adhesive tape to prevent light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the gap between the optical sheet and the liquid crystal panel is reduced to decrease device thickness, then the overall device thickness is reduced, but the optical sheet becomes more prone to deflection and sticking due to air-lock and thermal expansion
Solution Approach 1:
The fixing tape is divided into multiple regions: a bonding region that adheres the optical sheet to the liquid crystal panel, and a non-bonding region (notched portion) that allows air circulation. This segmentation prevents air-lock while maintaining the reduced gap structure, resolving the contradiction between thinness and stability.
Solution Approach 2:
The fixing tape has different properties in different regions: adhesive in the bonding region and non-adhesive in the notched portion. This local differentiation allows the tape to provide both bonding function and air passage function, enabling the optical sheet to remain stable without sticking in the reduced gap configuration.
2Strength
If the optical sheet is bonded to the liquid crystal panel using double-sided adhesive tape, then bonding strength is improved, but the optical sheet may deflect and stick due to air-lock in the enclosed space
Solution Approach 1:
The fixing tape is segmented into bonding regions and non-bonding notched portions. The bonding regions provide strong adhesion while the notched portions create air passages that prevent air-lock and thermal expansion issues, thus eliminating the harmful effects while maintaining bonding strength.
Solution Approach 2:
The notched portions act as intermediary air passages that mediate between the bonding function and the prevention of air-lock. These air passages allow air circulation in the enclosed space, preventing the formation of air-lock that would cause deflection and sticking.
3Ease of manufacture
If conventional fixing tapes without notched portions are used, then manufacturing simplicity is maintained, but luminance unevenness and Newton's rings appear due to optical sheet deflection
Solution Approach 1:
The fixing tape incorporates notched portions that are simple to manufacture using conventional cutting or punching techniques. These notches prevent optical sheet deflection and eliminate luminance unevenness and Newton's rings, thus improving optical quality uniformity without significantly complicating the manufacturing process.
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 suppresses the deflection of optical sheets, preventing luminance unevenness and Newton's rings, and maintains efficient bonding without increasing light leakage.
Implementation Method 1
The fixing tape has a notched portion through which an inner peripheral edge and an outer peripheral edge of the fixing tape are communicated with each other
Implementation Method 2
a light guide plate through which light from the light source travels
Implementation Method 3
an optical sheet providing an optical effect to light exiting the light guide plate
Data Source
AI summary
A display device includes a light source, a light guide plate through which light from the light source travels, an optical sheet providing an optical effect to light that exits the light guide plate, a display panel displaying an image upon receiving the light from the optical sheet, a frame in which the light guide plate and the optical sheet are arranged, and a fixing tape with which a peripheral edge of the optical sheet and a peripheral edge of the display panel or a peripheral edge of the frame and the peripheral edge of the display panel are bonded to each other. The fixing tape has a notched portion through which an inner peripheral edge and an outer peripheral edge of the fixing tape are communicated with each other.