Liquid Crystal Display Pixel Electrode Step Provider
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Solution Overview
Problem
Liquid crystal displays (LCDs) face challenges in achieving high transmittance and aperture ratio while minimizing texture, particularly in vertically aligned (VA) mode LCDs, where the formation of branch electrodes reduces aperture ratio and transmittance due to the need for cutouts and protrusions to control liquid crystal molecule tilt directions.
Innovation Solution
A liquid crystal display design featuring a substrate with a pixel electrode comprising partial plate electrodes and minute branch electrodes, along with a step provider formed in the passivation layer, which includes cross-shaped grooves and protrusions to control liquid crystal molecule alignment and reduce texture, thereby enhancing transmittance and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If minute branch electrodes are formed by creating cutouts in the pixel electrode, then liquid crystal molecule tilt direction is controlled to improve viewing angle, but aperture ratio and transmittance are reduced
Solution Approach 1:
The invention introduces a step provider structure that creates a height difference (vertical dimension) between regions of the pixel electrode. This vertical dimension allows control of liquid crystal molecule tilt directions without requiring horizontal cutouts in the electrode plane, thereby maintaining aperture ratio while achieving viewing angle improvement through controlled molecular orientation in different regions.
2Adaptability or versatility
If minute branch electrodes are formed by creating cutouts in the pixel electrode, then liquid crystal molecule tilt direction is controlled to improve viewing angle, but transmittance is deteriorated
Solution Approach 1:
By utilizing the vertical dimension through step provider structures rather than horizontal cutouts, the invention maintains continuous electrode coverage that allows light transmission, while still achieving viewing angle control through electric field manipulation in the vertical direction that orientes liquid crystal molecules appropriately.
3Illumination intensity
If a step provider is introduced to control liquid crystal alignment, then texture is reduced and transmittance is improved, but device structure becomes more complex
Solution Approach 1:
The step provider structure serves multiple functions simultaneously: it creates the necessary height difference for controlled liquid crystal alignment, defines the boundaries of minute branch electrode regions, and maintains structural integrity of the pixel electrode. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
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 design effectively increases transmittance and maintains a high aperture ratio by controlling liquid crystal molecule alignment, reducing texture, and improving the control force of liquid crystal molecules, as demonstrated by experimental results showing improved performance with specific step heights and groove configurations.
Implementation Method 1
a step provider positioned between the substrate and the pixel electrode
Implementation Method 2
A voltage is applied to the field generating electrodes to generate an electric field on the liquid crystal layer, and the orientation of liquid crystal molecules of the liquid crystal layer is determined and the polarization of incident light is controlled through the generated electric field
Data Source
AI summary
A liquid crystal display including a partial plate electrode along with a minute pattern in a pixel electrode thereby increasing the viewing angle and the lateral visibility of the liquid crystal display, as well as the response speed A step provider is provided to reinforce the control force of the liquid crystal molecules, thereby reducing the texture generated in the center of the pixel.