Liquid Crystal Sub-Pixel Driving Method for Image Sticking
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Solution Overview
Problem
Liquid crystal display panels suffer from image sticking issues due to charged impurities or ions, which lead to reduced display quality and cannot be significantly mitigated by current solutions involving reliable materials or modified fabrication processes.
Innovation Solution
A driving method for liquid crystal sub-pixels is introduced, dividing the display regions into multiple areas and applying specific liquid crystal voltages to each region to maintain target transmittance or luminance levels, ensuring the sub-pixel is not sensitive to voltage variations, thereby reducing image sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If more reliable liquid crystal materials or modified fabrication processes are adopted to reduce quantity of charged impurities or ions, then image sticking problem is reduced, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent changes the driving parameters by applying different voltages to different sub-regions within a pixel. Instead of modifying materials or fabrication processes, the solution alters the electrical parameters (voltage distribution) to compensate for the effects of charged impurities, thereby reducing image sticking without increasing manufacturing complexity
Solution Approach 2:
The patent divides each pixel into multiple sub-regions (e.g., four sub-regions) and applies different driving voltages to each sub-region. This segmentation allows independent control of voltage in different areas, enabling compensation for voltage variations caused by charged impurities while maintaining simple manufacturing processes
2Measurement precision
If different voltages are applied to different sub-regions to compensate for voltage variation, then transmittance accuracy is improved, but driving circuit complexity increases
Solution Approach 1:
Each pixel is divided into multiple sub-regions with independent voltage control. This segmentation enables precise control of transmittance in each sub-region to compensate for voltage variations, achieving high transmittance accuracy while using a relatively simple driving circuit structure
Solution Approach 2:
The patent employs periodic inversion of voltage signs in alternating frames. In even frames, sub-regions receive voltages of one polarity, while in odd frames, the polarities are reversed. This periodic action compensates for voltage variations without requiring complex real-time adjustment circuits
3Stability of the object's composition
If liquid crystal voltage is increased to maintain transmittance against voltage variation, then transmittance stability is improved, but power consumption increases
Solution Approach 1:
By segmenting pixels into sub-regions with independent voltage control, the patent can apply minimal necessary voltages to each sub-region to maintain target transmittance. This prevents excessive voltage application and reduces overall power consumption while maintaining transmittance stability
Solution Approach 2:
The periodic voltage inversion scheme allows the system to maintain transmittance stability through alternating polarity application rather than continuously high voltage. This periodic action reduces average power consumption while compensating for voltage variations caused by charged impurities
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 method effectively reduces image sticking by ensuring the liquid crystal sub-pixel displays correct transmittance or luminance levels, even with variations in liquid crystal voltage, thereby improving display quality.
Implementation Method 1
applying a liquid crystal voltage Vk to each of the display regions respectively such that transmittance of the liquid crystal layer within each of the display regions is Tk(Vk)
Data Source
AI summary
A driving method for determining target transmittance of a liquid crystal sub-pixel is provided. The liquid crystal sub-pixel has display regions, the liquid crystal sub-pixel displays the target transmittance when liquid crystal voltage applied to each display region is equal to one other and transmittance variation of liquid crystal layer in the liquid crystal sub-pixel is S0 when variation of LC voltage ΔVLC occurs. The driving method includes selecting LC voltages in accordance with the target transmittance and area ratio of each display region; and applying each LC voltage to one of the display regions correspondingly, wherein transmittance of each display region is different from the target transmittance, the target transmittance is equal to sum of product of area ratio and transmittance of each display region, and transmittance variation of the liquid crystal layer in the liquid crystal sub-pixel is lower than S0 when variation of LC voltage ΔVLC occurs.