Display Panel Voltage Ratio Dynamics for Viewing Angle and Transmittance
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Solution Overview
Problem
Existing liquid crystal display panels face challenges in balancing transmittance and viewing angle across different gray levels, leading to limited viewing angles at low gray levels and reduced transmittance at high gray levels.
Innovation Solution
The display panel incorporates a configuration with multiple data signal lines, shared signal lines, and sub-pixels featuring first and second pixel electrodes. The second pixel voltage has a higher ratio to the first pixel voltage at high gray levels compared to low gray levels, optimizing the liquid crystal deflection angles for improved viewing angles and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the sub-pixels have high LCS at low gray levels to improve viewing angle, then the viewing angle range is expanded, but the transmittance is reduced
Solution Approach 1:
The patent applies dynamics by making the LCS value gray-level dependent rather than fixed. The second pixel voltage is dynamically adjusted based on the gray level: at low gray levels, the second pixel voltage is reduced to achieve lower LCS and larger viewing angle; at high gray levels, the second pixel voltage is increased to achieve higher LCS and better transmittance. This dynamic adjustment resolves the contradiction between viewing angle and transmittance across different operating conditions.
Solution Approach 2:
The patent changes the parameter of second pixel voltage according to gray level. By varying the second pixel voltage based on the gray level (0-255), the system achieves different LCS values: lower LCS at low gray levels for improved viewing angle, and higher LCS at high gray levels for improved transmittance. This parameter change strategy allows simultaneous optimization of both viewing angle and transmittance across the full gray level range.
2Illumination intensity
If the sub-pixels have low LCS at high gray levels to improve transmittance, then the transmittance is increased, but the viewing angle range is limited
Solution Approach 1:
The system dynamically adjusts the second pixel voltage based on gray level to resolve this contradiction. At high gray levels, the second pixel voltage is increased to achieve higher LCS and better transmittance. At low gray levels, the second pixel voltage is reduced to achieve lower LCS and larger viewing angle. This dynamic behavior allows the system to optimize for transmittance when needed and for viewing angle when needed.
Solution Approach 2:
The patent implements parameter changes by making the second pixel voltage gray-level dependent. The voltage ratio (LCS) is changed according to the gray level: higher ratio at high gray levels for improved transmittance, and lower ratio at low gray levels for improved viewing angle. This parameter adaptation allows the system to satisfy both transmittance and viewing angle requirements across different operating conditions.
3Ease of manufacture
If the same pixel voltage is applied to main and sub areas, then the manufacturing is simplified, but the viewing angle is limited due to small deflection angle difference
Solution Approach 1:
The patent segments the pixel structure into main area and sub area with different voltage control. The main area receives only the first pixel voltage from the data signal line, while the sub area receives both the first pixel voltage and an additional second pixel voltage from the shared signal line. This segmentation allows independent voltage control of main and sub areas, creating different liquid crystal deflection angles to improve viewing angle while maintaining manufacturing simplicity through the shared signal line design.
Solution Approach 2:
The shared signal line acts as an intermediary to provide the second pixel voltage to the sub area. This intermediary structure enables voltage differentiation between main and sub areas without requiring completely separate voltage control circuits. The shared signal line delivers the additional voltage signal that creates the deflection angle difference needed for improved viewing angle while keeping the overall structure relatively simple.
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 enhances the viewing angle range at low gray levels and maintains high transmittance at high gray levels, thereby improving the overall display effect of the panel.
Implementation Method 1
the liquid crystal molecules corresponding to the main and sub areas have different liquid crystal deflection angles
Implementation Method 2
The traditional vertical alignment mode liquid crystal display panel has a large difference in the birefringence of the liquid crystal molecules, which results in a serious color shift at large-viewing angle
Data Source
AI summary
The present application discloses a display panel and a display device, which include a plurality of sub-pixels, and each of sub-pixel includes a first pixel electrode with a first pixel voltage and a second pixel electrode with a second pixel voltage; when the sub-pixels are in a low-gray-scale state, the second pixel voltage and the first pixel voltage have a first ratio; when the sub-pixels are in a high-gray-scale state, the second pixel voltage and the first pixel voltage have a second ratio, and the second ratio is greater than the first ratio.