Colored Member Mediator for LCD Cell Gap Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In liquid crystal displays (LCDs), the alignment of pixel electrodes and color filters on opposite panels leads to alignment errors, resulting in non-uniform cell gaps and image defects like stains or light leakage due to step discontinuities at the edges of pixel electrodes.
Innovation Solution
A liquid crystal display configuration where a colored member is formed on the light blocking member, smoothing out height differences between the light blocking member and color filters, maintaining a uniform cell gap and improving liquid crystal molecule orientation, with the colored member and spacer formed simultaneously in the same layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the light blocking member is formed on the display panel with color filters, then the alignment of pixel electrodes and color filters is improved, but the upper surface becomes uneven creating step discontinuities
Solution Approach 1:
A colored member is introduced as an intermediary layer between the light blocking member and the pixel electrode. This colored member fills the height difference created by the light blocking member, providing a planar upper surface while maintaining the alignment benefits of the light blocking member positioned on the color filters.
2Manufacturing precision
If the light blocking member extends along the gate line to cover the thin film transistor, then alignment errors are reduced, but the cell gap becomes non-uniform at the edges
Solution Approach 1:
The colored member serves as a mediator that extends along the gate line and covers the thin film transistor region. It provides a planar upper surface that maintains uniform cell gap at the edges while still allowing the light blocking member to extend along the gate line for improved alignment.
Solution Approach 2:
The colored member is positioned specifically in regions where height differences occur (at the edges and where the light blocking member meets the pixel electrode). This local application provides planarity exactly where needed without affecting the overall structure or requiring the entire light blocking member to be modified.
3Object-affected harmful factors
If the top surface of the light blocking member is lower than other layers, then the light blocking function is maintained, but the display panel top surface becomes uneven
Solution Approach 1:
The colored member acts as an intermediary that bridges the height difference between the light blocking member (which maintains its light-blocking function at a lower position) and the upper surface of other layers. It provides the necessary planarity at the top surface while allowing the light blocking member to remain at its functionally optimal lower position.
Data Source
AI summary
A liquid crystal display according to an exemplary embodiment of the present invention includes: a first substrate; a first signal line disposed on the first substrate; a thin film transistor connected to the first signal line; a color filter and a light blocking member disposed on the first substrate; a pixel electrode disposed on the color filter and the light blocking member; and a colored member formed on the pixel electrode and disposed on the light blocking member, the colored member having an upper surface that is generally planar with an upper surface of the color filter.