Display Substrate Electrode Bar Layout for Low-Frequency Flicker
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Solution Overview
Problem
Liquid crystal display devices experience flicker and decreased display quality due to the flexoelectric effect when the frequency of operation is reduced to lower power consumption, causing differences in transmittance between adjacent frames.
Innovation Solution
A display substrate design with specific electrode configurations, including parallel electrode bars and slits, where the width of the electrode bars is optimized to reduce the flexoelectric effect, with a ratio of 0.06 to 0.3 of the electrode bar width to the sub-pixel region width, and a change value formula for transmittance between frames, to minimize flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the operation frequency of the liquid crystal display device is lowered to reduce power consumption, then the service time is prolonged, but the flexoelectric effect causes different transmittance during polarity inversion, resulting in image flicker and decreased display quality
Solution Approach 1:
The common electrode is divided into multiple electrode bars arranged in parallel, with slits formed between adjacent electrode bars. This segmentation allows different regions of the common electrode to have different potentials, creating a more uniform electric field distribution that reduces the flexoelectric effect and minimizes transmittance differences during polarity inversion, thereby reducing image flicker while maintaining low operating frequency
Solution Approach 2:
The electrode bars are designed with specific width ratios (0.06 to 0.3 of the sub-pixel region width) and are positioned at specific locations within sub-pixel regions. This local optimization ensures that the electric field is more uniformly distributed in regions where liquid crystal molecules are present, reducing the flexoelectric effect locally where it matters most for display quality while maintaining overall power efficiency
2Use of energy by moving object
If the operation frequency is reduced to lower power consumption, then energy efficiency is improved, but the transmittance change between adjacent frames increases, causing flicker
Solution Approach 1:
The common electrode is segmented into multiple electrode bars with slits between them, creating a distributed electrode structure. This segmentation enables more uniform potential distribution across the electrode area, which stabilizes the electric field and reduces transmittance variations between adjacent frames during low-frequency operation, thereby improving both energy efficiency and transmittance stability
Solution Approach 2:
The electrode bar width is optimized to a specific ratio (0.06 to 0.3 of the sub-pixel region width) to achieve the best balance between reducing the flexoelectric effect and maintaining low operating frequency. This parameter optimization ensures minimal transmittance change between frames while keeping power consumption low
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 optimized electrode configuration reduces the change in transmittance between frames, resulting in a flicker value less than -30 dB at a 60 Hz driving frequency, thereby improving display quality and reducing power consumption.
Implementation Method 1
as the frequency changing, since the transmittance of the liquid crystal molecules may be different due to the flexoelectric effect during the polarities of the liquid crystal molecules being inverted
Data Source
AI summary
A display substrate, including a substrate having multiple sub-pixel regions, at least one sub-pixel region includes: a first electrode and a second electrode on the substrate and insulated from each other, the second electrode being located on a side of the first electrode away from the substrate; the second electrode includes multiple electrode bars arranged in parallel along a first direction, a first slit is formed between every two adjacent electrode bars in any second electrode; in the first direction, a width of the electrode bar is smaller than that of the sub-pixel region each sub-pixel region includes at least three electrode bars; a ratio of a width of at least one electrode bar to that of the sub-pixel region ranges from 0.06 to 0.3, and one of the first electrode or the second electrode is a pixel electrode, and the other is a common electrode.