Tilted Pixel Edge Electrodes for VA LCD Light Leakage
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Solution Overview
Problem
Vertical alignment liquid crystal display devices driven by multiplex driving suffer from irregular light leakage at pixel edges when viewed from the anti-viewing direction, leading to reduced display quality and the need for higher frame frequencies, which increases power consumption and generates crosstalk.
Innovation Solution
The configuration of electrodes with obliquely crossing line segments and broken curve shapes on the substrates, where the pixel edges are demarcated by these segments, helps to homogenize light leakage and improve display uniformity, allowing for lower frame frequencies while maintaining high display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiplex driving is used in vertical alignment liquid crystal display devices, then productivity is improved, but light leakage occurs at pixel edges when viewed from the anti-viewing direction
Solution Approach 1:
The pixel edges are designed with asymmetric inclination angles relative to the alignment direction. Specifically, pixel edges form acute angles with the alignment direction on two opposite sides and obtuse angles on the other two sides, breaking the symmetry that causes uniform light leakage. This asymmetric configuration suppresses the fringe electric field effects that lead to light leakage at pixel edges when viewed from the anti-viewing direction.
Solution Approach 2:
Different portions of the pixel boundaries are given different geometric properties. The pixel edges are configured with specific inclination angles relative to the alignment direction, creating local variations in electric field distribution. This local quality adjustment ensures that light leakage is suppressed at critical edges while maintaining overall display performance.
2Object-affected harmful factors
If frame frequency is increased to reduce light leakage, then display quality is improved, but power consumption increases
Solution Approach 1:
The invention converts the harmful fringe electric field effect into a beneficial configuration by carefully designing pixel edge angles. By setting specific inclination angles, the fringe electric field is directed in a way that suppresses light leakage rather than causing it. This allows the display to maintain high quality at lower frame frequencies, reducing power consumption while eliminating the need to increase frequency to combat light leakage.
3Manufacturing precision
If frame frequency is increased to improve display uniformity, then display quality is improved, but crosstalk increases
Solution Approach 1:
The asymmetric pixel edge configuration creates non-uniform electric field distribution that suppresses the formation of dark regions and crosstalk. By inclining pixel edges at specific angles, the electric field lines are redirected away from pixel boundaries, preventing the fringe effects that cause display non-uniformity and crosstalk. This allows for lower frame frequencies without sacrificing display 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
This configuration effectively reduces light leakage irregularity and enhances display uniformity, particularly from the anti-viewing direction, while minimizing power consumption and crosstalk, thereby improving the overall display quality and reducing the required frame frequency.
Implementation Method 1
liquid crystal molecules are aligned substantially vertically relative to the surface of the respective substrates within the liquid crystal layer
Implementation Method 2
liquid crystal material having a negative dielectric constant anisotropy, and a voltage that is not less than a threshold voltage is applied between the electrodes of the respective substrates, most of the liquid crystal molecules in the liquid crystal layer become inclined in the horizontal alignment direction
Data Source
AI summary
A liquid crystal display device includes a first and a second substrate placed opposite each other, a first electrode provided on the first substrate extending in a first direction, a second electrode provided on the second substrate extending in a second direction that is orthogonal to the first direction, and a vertically-aligned liquid crystal layer provided between the two substrates. A pixel is defined where the two electrodes intersect, and alignment treatment is performed to the first or second substrate in a direction parallel to the first direction. The first electrode has a linear shape in which electrode edges on either side extend in the first direction, and the second electrode is of a polygonal line shape in which an electrode edge of one side includes a line segment which obliquely crosses the first direction, and the pixel is demarcated by pixel edges including obliquely crossing line segments.