Display Panel Notch Alignment Layer Roughness
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Solution Overview
Problem
In conventional polymer sustained alignment (PSA) technology for liquid crystal display (LCD) panels, the electric-field intensity is weaker in notches of the transparent conductive layer, leading to unstable rotation of LC molecules, affecting response time and causing image retention issues.
Innovation Solution
A display panel design with a first substrate having a transparent conductive layer and an alignment layer, where the alignment layer has a part with greater surface roughness within the notch and another part on the surface, stabilizing LC molecules by larger protrusions, preventing them from being affected by the surrounding electric field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a patterned notch is formed on the transparent conductive layer to enable LC rotation and multi-domain alignment, then the response time of LC is accelerated, but the electric-field intensity in the notch becomes weaker causing unstable LC rotation and image retention
Solution Approach 1:
The alignment layer is designed with different surface roughness in different regions: the first part within the notch has greater surface roughness to stabilize LC molecules, while the second part on the transparent conductive layer has smaller surface roughness to allow normal electric field control. This local differentiation resolves the contradiction by providing region-specific functionality.
2Adaptability or versatility
If the transparent conductive layer is removed in the notch region to enable LC rotation, then the LC can rotate along the pre-tilted direction, but the electric field intensity becomes insufficient leading to uncontrollable LC rotation
Solution Approach 1:
The alignment layer's surface roughness is locally optimized: greater roughness in the notch region provides physical stabilization for LC molecules that need to rotate, while smaller roughness in other regions maintains proper electric field control. This allows both rotation capability and controllability to coexist.
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 design enhances the response ability of LC molecules in the notch region, maintaining stability and preventing image retention by ensuring controlled rotation and alignment.
Implementation Method 1
the surface roughness of the first part of the first alignment layer is greater than that of the second part
Implementation Method 2
When the pixel electrode of the display panel is driven to generate an electric field, the LC can rotate along the pre-tilted direction through the notch and the alignment layer
Data Source
AI summary
A display panel comprises a first substrate, a second substrate and a liquid crystal layer. The first substrate includes a first transparent conductive layer and a first alignment layer. The first transparent conductive layer includes a first surface and has at least a first notch, the first alignment layer includes a first part and a second part, the first part is disposed in the first notch, the second part is disposed on the first surface, and the surface roughness of the first part of the first alignment layer is greater than that of the second part. The second substrate is disposed opposite to the first substrate. The liquid crystal layer is disposed between the first substrate and the second substrate. A display device having the display panel is also disclosed.