Liquid Crystal Display Panel Dielectric Layer Tilt Angle Optimization
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Solution Overview
Problem
Vertical alignment liquid crystal display panels experience reduced light-transmittance due to the distance between the pixel electrode and the liquid crystal molecules, resulting in smaller tilt angles of liquid crystal molecules, which limits the panel's ability to allow light to pass effectively.
Innovation Solution
The implementation of a dielectric layer with a first dielectric unit and a second dielectric unit, having different dielectric constants and positions relative to the common and pixel electrodes, respectively, to alter the electric field distribution and increase the tilt angles of liquid crystal molecules, thereby enhancing light-transmittance. This can be achieved through various configurations such as dielectric units at intervals, slits, or concave-convex shapes on the second common electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent dielectric layer is formed on the color-filter substrate to cover the second common electrode, then the light-transmittance of the liquid crystal display panel is improved, but the device structure becomes more complex
Solution Approach 1:
The dielectric layer is segmented into a first dielectric unit positioned opposite the first common electrode and a second dielectric unit positioned opposite the pixel electrode. This segmentation allows different regions of the dielectric layer to serve different functional purposes: the first dielectric unit enhances the horizontal electric field component while the second dielectric unit optimizes the vertical electric field component, thereby improving light-transmittance without requiring a completely redesigned complex structure
Solution Approach 2:
Different dielectric materials with different dielectric constants are used in different locations of the dielectric layer. The first dielectric unit has a first dielectric constant and the second dielectric unit has a second dielectric constant, allowing local optimization of electric field distribution in different regions to maximize light-transmittance improvement while maintaining structural simplicity
2Ease of manufacture
If the distance from the pixel electrode to the liquid crystal molecules is large, then the manufacturing process is simplified, but the tilt angles of liquid crystal molecules are reduced leading to lower light-transmittance
Solution Approach 1:
The dielectric layer acts as an intermediary between the pixel electrode and the liquid crystal molecules. By introducing this intermediate layer with specific dielectric properties, the electric field distribution in the liquid crystal layer is modified without changing the physical distance between the pixel electrode and the liquid crystal molecules, thus maintaining manufacturing simplicity while improving light-transmittance through enhanced molecular tilt angles
3Illumination intensity
If the proportion of horizontal electric field is increased to increase liquid crystal molecule tilt angles, then light-transmittance is improved, but the electric field distribution becomes less uniform
Solution Approach 1:
The dielectric layer is divided into two functional units with different dielectric constants positioned at different locations. This segmentation creates a balanced electric field distribution where the horizontal field component is enhanced in regions where it is needed for molecular tilt, while the vertical field component is maintained in regions where it provides stability, achieving both improved light-transmittance and maintained field uniformity
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
The solution effectively increases the tilt angles of liquid crystal molecules when power is applied, improving light-transmittance and enhancing the display function of the liquid crystal display panel beyond previous designs.
Implementation Method 1
When power is supplied, oblique electric fields are formed among the three electrodes, the liquid crystal molecules under the effect of the two electric fields deviate from their vertical positions to be in a tilted manner
Implementation Method 2
a transparent dielectric layer 122 is formed on the color-filter substrate to cover the second common electrode 121. The dielectric layer 122 can increase the proportion of the horizontal electric field with respect to the vertical electric field
Data Source
AI summary
A liquid crystal display panel and a liquid crystal display are disclosed. The liquid crystal display panel comprises: a first substrate and a second substrate, disposed opposite to each other to form a cell, as well as a liquid crystal layer between the two substrates. On the first substrate, there is formed with a first common electrode and a pixel electrode, arranged at an interval; on the second substrate, there is formed with a set of layers, the set of layers comprising: a second common electrode, and a dielectric layer covering one side of the second common electrode facing the first substrate; and the structure of the set of layers is different at a position directly opposite to the first common electrode from that at a position directly opposite to the pixel electrode.