Patterned Retarder Sizing for TAB Repair in 3D Displays
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Solution Overview
Problem
In three-dimensional (3D) image display devices using the glass method, the patterned retarder is larger than the display panel, making it impossible to repair the tape automated bonding (TAB) components after attachment, leading to increased costs due to the need to discard the entire display panel if the TAB is damaged or defective.
Innovation Solution
A 3D image display device design where the patterned retarder is attached such that the pad area, including the TAB components, is exposed, allowing for repair after attachment by ensuring the patterned retarder's dimensions are greater in one direction than the upper substrate but smaller or equal in that direction than the lower substrate, thereby exposing the TAB for repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the patterned retarder is made larger than the display panel to ensure vibration and impact resistance, then the structural stability is improved, but the TAB components become inaccessible for repair after attachment
Solution Approach 1:
The patent divides the lower substrate into two distinct areas: a pixel array area and a pad area. The patterned retarder is strategically sized to cover only the pixel array area while leaving the pad area exposed. This segmentation allows the retarder to provide protection where needed while maintaining access to TAB components for repair purposes.
Solution Approach 2:
The patterned retarder is designed with non-uniform coverage - it provides full coverage and protection over the pixel array area while intentionally leaving the pad area exposed. This local differentiation in coverage quality allows simultaneous achievement of vibration resistance over the display area and repairability at the edges.
2Reliability
If the patterned retarder covers the entire display panel including the pad area, then the protection and stability are improved, but the cost increases due to inability to repair defective TAB components
Solution Approach 1:
The patent segments the coverage area of the patterned retarder to distinguish between the pixel array area (requiring protection) and the pad area (requiring accessibility). By applying the retarder only to the pixel array area, the system achieves necessary protection while avoiding coverage of repairable components, thus reducing waste.
Solution Approach 2:
The patent enables recovery of value by allowing repair of TAB components even after the display panel is assembled. By leaving the pad area exposed, defective TAB components can be replaced without discarding the entire display panel, thereby recovering value and reducing waste.
3Ease of repair
If the patterned retarder is made smaller to expose the pad area for repair, then the repairability is improved, but the vibration and impact resistance may be compromised
Solution Approach 1:
The patent segments the lower substrate into pixel array area and pad area, and applies the patterned retarder selectively to cover only the pixel array area. This segmentation ensures that the retarder provides vibration and impact resistance where the display content is shown, while leaving the pad area exposed for TAB repairability.
Solution Approach 2:
The patterned retarder provides localized protection quality - full coverage and protection over the pixel array area where visual display occurs, and no coverage over the pad area where repair access is needed. This local quality differentiation resolves the contradiction between protection and repairability.
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
Enables the repair of TAB components post-attachment, reducing waste and costs associated with replacing the entire display panel, while maintaining vibration and impact resistance through appropriate sizing and attachment of the patterned retarder.
Implementation Method 1
a patterned retarder attached to the display panel and having retarder patterns to apply first and second polarizations to light from the display panel corresponding to the left eye image and the right eye image, respectively
Data Source
AI summary
A three-dimensional (3D) image display device includes a display panel including an upper substrate and a lower substrate, the lower substrate having a pixel array area overlapped with the upper substrate and a pad area formed on at least one side of the lower substrate outside the pixel array area, wherein the display panel displays a left eye image and a right eye image; and a patterned retarder attached to the display panel and having retarder patterns to apply first and second polarizations to light from the display panel corresponding to the left eye image and the right eye image, respectively, wherein the pad area includes a first area in which data pads extending from data lines of the pixel array area are formed, and a second area in which gate pads extending from gate lines of the pixel array area are formed, and wherein the first area is exposed when the display panel and the patterned retarder are attached.