Display Panel Electrode Configuration for Voltage Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display panels with vertical-align liquid crystal molecules experience phase retardation under transverse electric fields, leading to higher driving voltage and lower light efficiency.
Innovation Solution
A display panel design featuring a blue-phase or positive-type liquid crystal layer with a specific electrode configuration, including a color filter substrate and a thin film transistor array substrate, where the first common electrode layer is disposed between the dielectric layer and the color filter layer, and the pixel electrode layer is on the same layer as the second common electrode layer, reducing the vertical electric field and enhancing the horizontal electric field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If vertical-align liquid crystal molecules are used with conventional OC layer, then the transverse electric field is generated, but phase retardation occurs leading to higher driving voltage and lower light efficiency
Solution Approach 1:
The patent changes the liquid crystal material parameters by using blue-phase liquid crystal or positive-type liquid crystal instead of conventional vertical-align liquid crystal. This material parameter change eliminates phase retardation effects, allowing for reduced driving voltage while maintaining or improving light efficiency. The patent also modifies the electrode configuration parameters by removing the OC layer and adjusting electrode patterns to optimize the electric field distribution for the new liquid crystal type.
2Reliability
If conventional electrode configuration with OC layer is used, then the transverse electric field is generated, but this causes phase retardation phenomenon
Solution Approach 1:
The patent extracts and removes the over-coater (OC) layer from the conventional electrode configuration. This extraction eliminates the source of transverse electric field that causes phase retardation. The patent also removes or modifies certain electrode elements that contribute to harmful electric field patterns, keeping only the essential common electrode and pixel electrode configuration needed for display operation.
3Power
If the first common electrode layer is disposed between the dielectric layer and the color filter layer, then the vertical electric field is reduced, but the structure complexity increases
Solution Approach 1:
The patent repositions the first common electrode layer from the conventional position to be disposed between the dielectric layer and the color filter layer, effectively changing its spatial dimension and location within the display structure. This dimensional repositioning allows the electrode to create a more favorable electric field distribution that reduces vertical field components, thereby lowering driving voltage requirements while maintaining structural integration.
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 configuration reduces the driving voltage and improves display quality by preventing phase retardation and dark-state light leakage, enhancing light efficiency and contrast.
Implementation Method 1
the liquid crystal layer is a blue-phase liquid crystal layer or a positive-type liquid crystal layer, wherein the blue-phase liquid crystal layer comprises blue-phase liquid crystal molecules, the positive-type liquid crystal layer comprises positive-type liquid crystal molecules
Implementation Method 2
under the effect of the transverse electric field, the liquid crystal molecules will create a phase retardation phenomenon
Data Source
AI summary
A display panel and a display device are provided. A color filter substrate of the display panel includes a color filter layer and a first common electrode; the first common electrode is located in a first sub-area of the color filter layer; a thin film transistor array substrate of the display panel includes a second substrate, a second common electrode, and a pixel electrode; the second common electrode and the pixel electrode are respectively located in a third sub-area and a fifth sub-area of the second substrate. The driving voltage of the display panel can be reduced.