Liquid Crystal Layer Thickness Gradient for Display Uniformity
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Solution Overview
Problem
In liquid crystal display devices, voltage drops along scanning lines cause non-uniform image display due to resistance in metal scanning lines, resulting in brighter images near the input end and darker images farther away, affecting display uniformity.
Innovation Solution
A display panel design with a liquid crystal layer thickness gradually decreasing from the output near-end to the output far-end of the gate line, accompanied by spacers and a black matrix with varying thicknesses or heights, and alignment layers with increasing thicknesses, to maintain constant voltage drops and improve display uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal scanning lines are used for image display, then electrical conductivity is achieved, but voltage drop increases with transmission distance causing non-uniform display
Solution Approach 1:
The liquid crystal layer thickness is varied locally along the gate line direction, being thinner at the output near-end and thicker at the output far-end. This local variation in thickness compensates for the voltage drop along the gate line, ensuring uniform display brightness across different regions of the display panel.
Solution Approach 2:
The physical parameter of liquid crystal layer thickness is changed along the gate line direction to compensate for voltage drop. By adjusting the thickness parameter, the capacitance is modified to balance the voltage distribution, maintaining consistent display quality from near-end to far-end of the gate line.
2Reliability
If liquid crystal layer thickness is decreased at output far-end to compensate voltage drop, then display uniformity improves, but manufacturing precision requirements increase
Solution Approach 1:
The spacers are pre-formed with varying heights before liquid crystal injection. These spacers serve as spacers that define the liquid crystal layer thickness, establishing the thickness gradient in advance. This preliminary structuring simplifies the manufacturing process by providing a physical template for achieving the desired thickness variation.
Solution Approach 2:
Spacers are introduced as intermediary elements between the substrates to control liquid crystal layer thickness. The spacers act as mediators that physically maintain the desired gap distance, making it easier to achieve precise thickness control during assembly without requiring extremely precise substrate positioning.
Data Source
AI summary
Disclosed is a display panel and a display device. The display panel includes an array substrate, a color filter substrate and a liquid crystal layer. A plurality of parallel gate lines is disposed on the array substrate. The liquid crystal layer is disposed between the array substrate and the color filter substrate. The liquid crystal layer has a thickness gradually decreasing along a direction from an output near-end to an output far-end of the gate line. Display uniformity of a panel can be improved by the display panel and the display device.