Display Panel Photo Alignment with Local Pretilt Angles
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Solution Overview
Problem
Large display panels using Fine Slit Vertical Alignment (FSA) technology experience color shifts due to uniform pretilt angles of liquid crystal molecules, leading to inconsistent light transmittance and display quality across the panel.
Innovation Solution
A display panel design with a first and second substrate and a liquid crystal layer, where the display area is divided into distinct areas with different pretilt angles of liquid crystal molecules achieved by applying different common voltages to the first and second common electrodes, allowing for varied light transmittance and improved color accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform pretilt angles are applied to all liquid crystal molecules in the display panel, then the manufacturing process is simplified, but color shifts occur and display quality deteriorates
Solution Approach 1:
The patent applies different pretilt angles to different regions of the display panel by dividing the common electrode into multiple regions (first common electrode region and second common electrode region) with different voltage applications. This local differentiation allows each region to have optimized pretilt angles specific to its position, eliminating color shifts while maintaining manufacturing feasibility through region-specific voltage control during the photoalignment process.
Solution Approach 2:
The patent changes the voltage parameter applied to different common electrode regions to achieve different pretilt angles. By applying different voltages (first voltage to first common electrode region, second voltage to second common electrode region) during photoalignment, the liquid crystal molecules form different pretilt angles in different regions, thereby improving display quality and eliminating color shifts without complicating the overall manufacturing process.
2Manufacturing precision
If different pretilt angles are applied to different areas of the display panel, then color shifts are reduced and display quality is improved, but the device complexity increases
Solution Approach 1:
The patent segments the common electrode into multiple independent regions (first common electrode region and second common electrode region) that can be controlled separately. This segmentation allows different voltage applications to different regions, creating different pretilt angles as needed. The segmentation is implemented through physical or electrical division of the common electrode, enabling region-specific control without requiring completely separate electrode structures.
Solution Approach 2:
The patent makes the common electrode multi-functional by enabling it to serve both as a common reference electrode and as a region-specific control electrode. By dividing the common electrode into multiple regions that can be independently voltage-controlled, it performs the universal function of establishing pretilt angles while also providing region-specific optimization. This multi-functionality reduces the need for additional separate electrodes or complex alignment layers.
3Manufacturing precision
If different voltages are applied to first and second common electrodes during photoalignment, then different pretilt angles are achieved, but the driving method complexity increases
Solution Approach 1:
The patent implements dynamic voltage control during the photoalignment process by applying different voltages to different common electrode regions at different times or in different patterns. The driving method includes time-sequential voltage application where the first common electrode region receives first voltage and the second common electrode region receives second voltage, allowing dynamic adjustment of pretilt angles during the alignment process. This dynamic approach enables precise pretilt angle control while using a unified electrode structure.
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 enables faster alignment of liquid crystal molecules to their expected tilt positions, reducing color shifts and enhancing display quality, especially at wide viewing angles, by creating areas with different brightness levels without overlapping, thus improving overall panel performance.
Implementation Method 1
applying a first common voltage to the first common electrode, and applying a second common voltage different from the first common voltage to the second common electrode to allow the first common electrode and the second common electrode to form different voltage differences with the corresponding pixel electrodes
Implementation Method 2
performing photo-alignment after liquid crystal molecules in a liquid crystal layer reach predetermined deflection angles to allow the liquid crystal molecules in the liquid crystal layer to form different pre-tilt angles corresponding to the first common electrode and the second common electrode
Data Source
AI summary
The present application discloses a display panel, a method of photo alignment and a driving method of the display panel. A display area of the display panel is divided into at least a first area and a second area, light transmittance of the first area is different from that of the second area when driven by the identical voltage difference, and pre-tilt angles of liquid crystal molecules corresponding to the first area are different from those of liquid crystal molecules corresponding to the second area.