Display Panel Pixel Electrode Angle Optimization for Transmittance
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Solution Overview
Problem
Higher resolution and smaller pixel sizes in display panels disrupt the optimal alignment of liquid crystal molecules, reducing transmittance due to interference from adjacent electric fields, making it challenging to maintain high transmittance and energy efficiency.
Innovation Solution
The design of pixel electrodes with specific branch electrode angles, defined by equations A1 and B1, ensures that the average azimuthal angle of liquid crystal molecules approaches 45 degrees, enhancing transmittance by optimizing the alignment and reducing the impact of electric fields from data lines and common electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel size is reduced to increase resolution (higher ppi value), then the display panel achieves higher resolution, but the average azimuthal angle of liquid crystal molecules is affected by adjacent electric fields and cannot be maintained at 45 degrees, resulting in reduced transmittance
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the branch electrode angle based on the ppi value. Specifically, the branch electrode angle is calculated using the formula: angle = 45° - k*(ppi - 90°), where k is a constant. This ensures that as the ppi value increases, the branch electrode angle is adjusted to compensate for the electric field interference, maintaining the average azimuthal angle of liquid crystal molecules at 45 degrees and thereby preserving high transmittance.
2Illumination intensity
If the branch electrode angle is set to 45 degrees to maximize transmittance, then the display panel achieves higher transmittance, but with higher ppi values the electric field interference from adjacent data lines and common electrodes prevents the average azimuthal angle from being maintained at 45 degrees
Solution Approach 1:
The patent implements feedback by establishing a relationship between the branch electrode angle and the ppi value. The branch electrode angle is not fixed but is calculated based on the actual ppi value of the display panel. This feedback mechanism ensures that the angle adjustment compensates for the electric field interference effects, maintaining reliable alignment stability across different resolution levels.
3Productivity
If the pixel size is made smaller to increase resolution, then more pixels can be displayed in the same area, but the transmittance is reduced due to disrupted liquid crystal molecule alignment
Solution Approach 1:
The patent uses parameter changes to maintain energy efficiency while increasing pixel density. By adjusting the branch electrode angle based on the ppi value, the system maintains optimal liquid crystal molecule alignment even as pixel size decreases. This ensures that transmittance remains high, thereby preserving energy efficiency while achieving higher productivity in terms of pixel density.
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 design increases the transmittance of display panels by maintaining higher energy efficiency and improving product competitiveness, with transmittance gains ranging from 1% to 4% depending on the ppi value and angle configurations.
Implementation Method 1
photosensitive monomers are mixed with the liquid crystal during the one drop filling (ODF) process, and then an ultraviolet exposure is executed while an electric field is applied, so that the photosensitive monomers within the liquid crystal are cured
Implementation Method 2
the cured monomers are arranged according to the pattern of the pixel electrode of the TFT substrate so that the LC alignment can be achieved by the photocured monomers
Data Source
AI summary
A display panel comprises a first substrate, a second substrate and a pixel array. The pixel array is disposed between the first substrate and the second substrate and comprises a pixel electrode and a data line. The data line is disposed adjacent to the pixel electrode and disposed above a side of the first substrate facing the second substrate. The pixel electrode comprises a first trunk electrode and a plurality of branch electrodes. An extension of the first trunk electrode along a first direction crosses the data line and the first trunk electrode connects to the branch electrodes. The branch electrodes extend along a second direction. An angle y is formed by the first direction and the second direction, x is the value of the ppi of the display panel, and x and y satisfy the following equations:A1=−1.28×10−5(x)3+0.0047722(x)2−0.383068(x)+59.494865,B1=−2.38×10−5(x)3+0.0093751(x)2−1.098394(x)+81.919357,B1<y<A1,45°<y≦70°.