Pixel Electrode Structure for Liquid Crystal Display Panel
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Solution Overview
Problem
Conventional liquid crystal display panels suffer from dark streaks due to irregular liquid crystal orientations caused by uneven electric field strengths, affecting contrast and transmittance.
Innovation Solution
A pixel electrode structure with a trunk electrode dividing it into symmetrical first and second regions, a control electrode positioned close to the first region, and a connection electrode linking the control electrode to the second region, increasing the voltage drop interval and reducing the voltage difference across the display region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional pixel electrode design is used with voltage input terminal close to display region, then the liquid response time is improved, but dark streaks appear due to uneven electric field strength causing irregular liquid crystal orientations
Solution Approach 1:
The pixel electrode is segmented into multiple regions: a first pixel electrode region (10) with a first electric field strength, a second pixel electrode region (20) with a second electric field strength, and a control electrode region (30). This segmentation allows different regions to have different electric field characteristics, preventing uniform electric field distribution that causes dark streaks while maintaining fast response in critical areas.
Solution Approach 2:
Different regions of the pixel electrode are designed with different properties: the first pixel electrode region has higher electric field strength for faster response, while the second pixel electrode region has lower electric field strength to prevent dark streaks. The control electrode region provides intermediate field strength. This local differentiation of electric field characteristics resolves the contradiction between speed and uniformity.
2Speed
If voltage is applied through electrode region A to improve liquid crystal pretilt angle, then response time is improved, but uneven electric field strength causes dark streaks in display regions B and C
Solution Approach 1:
The electrode structure is divided into functionally distinct segments: first pixel electrode region, second pixel electrode region, and control electrode region. Each segment serves a specific purpose in managing electric field distribution, allowing the system to achieve both fast response and uniform liquid crystal alignment without dark streaks.
Solution Approach 2:
The control electrode region acts as an intermediary between the high-field first pixel electrode region and the low-field second pixel electrode region. It provides a transition zone with intermediate electric field strength, mediating the electric field distribution to prevent abrupt changes that would cause dark streaks while maintaining overall response performance.
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 reduces the effect of voltage on liquid crystal alignment, preventing dark streaks and enhancing the quality, contrast, and transmittance of the liquid crystal display panel.
Implementation Method 1
a voltage needs to be applied between an upper electrode 1 and a lower electrode 2 first so that the liquid crystals 3 exhibit a certain pretilt angle
Implementation Method 2
the liquid crystals are irregularly tilted
Data Source
AI summary
A pixel electrode structure and a liquid crystal display panel are provided. The pixel electrode structure includes a trunk electrode, a control electrode, and a connection electrode. The trunk electrode divides the pixel electrode structure into a first pixel electrode region and a second pixel electrode region. The control electrode is close to the first pixel electrode region and away from the second pixel electrode region, and is connected to a second branch electrode of the second pixel electrode region through the connection electrode. Increasing a transmission distance from the control electrode to the pixel electrode in a display region prevents an occurrence of dark streaks.