Optical Display Light Shielding Layer Printed Patterns
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Solution Overview
Problem
Conventional optical displays face challenges in maintaining a slim structure and concealing metal interconnection layers, especially when polarizing plates shrink or expand under high temperature and humidity conditions, which can affect visibility and increase thickness due to the use of black matrix layers.
Innovation Solution
The optical display incorporates a TFT substrate extending beyond a color filter substrate with a light shielding layer in the polarizing plate, featuring printed patterns that satisfy specific geometric equations to conceal the metal interconnection layers, reducing visibility differences between display and non-display regions, and embedding the light shielding layer within the polarizing plate to maintain a slim structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a black matrix layer is interposed between the TFT substrate and polarizing plate to conceal metal interconnection layer, then the metal interconnection layer is hidden, but the thickness of the optical display increases
Solution Approach 1:
The patent merges the light shielding function with the polarizing plate by forming the light shielding layer on the polarizing plate. This integration eliminates the need for a separate black matrix layer, achieving concealment of metal interconnection layers while maintaining a slim display structure. The light shielding layer is formed in a non-display region of the polarizing plate, combining multiple functions into a single component.
2Reliability
If the polarizing plate shrinks or expands under high temperature and humidity conditions, then the metal interconnection layer may become visible, but using a light shielding layer with specific geometric constraints maintains concealment
Solution Approach 1:
The patent applies parameter changes by defining specific geometric parameters for the light shielding layer (width W, height H, and position relative to display region) that satisfy the equation H ≤ W/2. These parameter constraints ensure that the light shielding layer maintains effective coverage of metal interconnection layers even when the polarizing plate undergoes thermal expansion or contraction, thereby ensuring reliable concealment under varying environmental conditions.
3Ease of manufacture
If the TFT substrate extends beyond the color filter substrate to accommodate metal interconnection layer, then the metal interconnection layer can be disposed, but the metal interconnection layer becomes more visible
Solution Approach 1:
The patent introduces the light shielding layer as an intermediary element between the extended TFT substrate (with metal interconnection layers) and the viewer. This light shielding layer, formed on the polarizing plate in the non-display region, acts as a visual barrier that conceals the metal interconnection layers while allowing the TFT substrate to extend for functional purposes. The intermediary layer resolves the conflict between manufacturing requirements and aesthetic concealment.
Data Source
AI summary
An optical display includes an optical display element including a second substrate, a first substrate facing the second substrate, a dummy region and a metal interconnection layer thereon. A first polarizing plate on an upper surface of the optical display element has a light shielding layer therein including printed patterns separated from each other. A first printed layer includes a first point at an interface between the display and non-display regions and a second point at a vertex closest to the first point. A second printed layer includes a third point at the interface and a fourth point at a vertex closes to the third point. The light shielding layer satisfies H≤P/2, where H is a minimum value among a distance from the interface to the second point and a distance from the interface to the fourth point, and P is a width of the dummy region.