Pixel Electrode Layout for Trace Mura Suppression in LCD Panels
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Solution Overview
Problem
Conventional pixel designs in advanced dimension switch liquid crystal display panels suffer from Trace Mura defects due to disordered liquid crystal molecule orientation at the ends of pixel electrodes, leading to reduced transmittance and light efficiency.
Innovation Solution
The array substrate design features pixel electrodes with a convex portion at an obtuse angle to the intermediate portions, preventing overlap with the pixel circuit and gate line projections, and ensuring a fixed molecular orientation to prevent disordered liquid crystal recovery and thus reducing Trace Mura defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixel electrodes have conventional designs without convex portions, then manufacturing is simpler, but liquid crystal molecules become disordered at the ends of pixel electrodes causing Trace Mura defects
Solution Approach 1:
The pixel electrode structure introduces a convex portion at specific locations (ends of the pixel electrode) to create local quality changes. This convex portion locally anchors liquid crystal molecules to prevent disordered orientation, while the rest of the pixel electrode maintains its conventional function. The convex portion is strategically placed only where needed to prevent Trace Mura defects without complicating the entire electrode structure.
Solution Approach 2:
The convex portion of the pixel electrode performs a preliminary action by pre-positioning and anchoring liquid crystal molecules at critical locations before the display operation begins. This preliminary molecular orientation prevents the disordered recovery that would otherwise occur at the ends of pixel electrodes, thereby preventing Trace Mura defects before they can manifest.
2Illumination intensity
If pixel electrodes are designed with convex portions to fix liquid crystal orientation, then transmittance improves, but manufacturing precision requirements increase
Solution Approach 1:
The invention optimizes specific parameters of the convex portion including its size, shape, and position to achieve the desired liquid crystal anchoring effect. By carefully controlling the dimensions and location of the convex portion, the design maximizes transmittance improvement while keeping manufacturing precision requirements within feasible limits. The convex portion parameters are tuned to provide sufficient molecular orientation control without requiring excessively tight manufacturing tolerances.
3Reliability
If intermediate portions extend obliquely to prevent disordered liquid crystal recovery, then Trace Mura defects are prevented, but the slit shape becomes more complex
Solution Approach 1:
The intermediate portions of the pixel electrode are designed with asymmetric oblique extensions rather than symmetric straight lines. This asymmetric geometry creates a directional guidance effect for liquid crystal molecules, forcing them to orient in a specific direction that prevents disordered recovery. The oblique angle and asymmetric shape of the intermediate portions provide the necessary molecular orientation control while the resulting parallelogram slit is a manageable geometric complexity.
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 enhances transmittance by eliminating corner designs at the slits, improving light efficiency, and effectively prevents Trace Mura defects by maintaining a stable liquid crystal orientation.
Implementation Method 1
each pixel electrode includes a first end portion and a second end portion arranged opposite to each other, a plurality of intermediate portions connecting the first end portion and the second end portion, and a convex portion located on one side of the second end portion... the convex portion extends in a direction at an obtuse angle to an extending direction of the intermediate portions
Data Source
AI summary
Disclosed are an array substrate and a display apparatus. The array substrate includes a base substrate; pixel circuits; gate lines; and pixel electrodes, where each pixel electrode includes a first end portion and a second end portion, intermediate portions connecting the first end portion and the second end portion, and a convex portion located on one side of the second end portion, the intermediate portions extend obliquely relative to both the first direction and the second direction, the convex portion extends in a direction at an obtuse angle to an extending direction of the intermediate portions, a slit between adjacent intermediate portions is a parallelogram, and an orthographic projection of the slit on the base substrate does not overlap with an orthographic projection of the pixel circuit on the base substrate and an orthographic projection of the gate line on the base substrate.