Display Panel Driving Method for Side Visibility and Artifact Control
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Solution Overview
Problem
Liquid crystal display (LCD) panels face challenges in improving side visibility and preventing moving checker artifacts due to differences in liquid crystal response velocities and luminance, especially when objects move within the image, which affects display quality and viewing angles.
Innovation Solution
A method of driving the display panel involves generating high and low data voltages with different gammas, where only the low data voltage is applied to pixels during at least one frame, optimizing the voltage sequence to balance the display of high and low frames to improve side visibility and prevent artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If time divisional driving method is used with equal duration for high gamma and low gamma periods, then viewing angle is improved, but side visibility is not sufficiently improved due to difference in liquid crystal response velocities
Solution Approach 1:
The patent applies periodic action by implementing time divisional driving with alternating high gamma and low gamma periods. The key innovation is making the low gamma period longer than the high gamma period to compensate for the slower falling response velocity of liquid crystal, ensuring sufficient display of low data voltage while maintaining improved viewing angle through periodic voltage variation.
2Adaptability or versatility
If PVA or S-PVA mode is used to improve viewing angle, then side visibility is improved, but aperture ratio decreases
Solution Approach 1:
The patent changes the temporal parameter of voltage application by implementing time divisional driving with different duration periods for high gamma and low gamma. This allows achieving side visibility improvement without the structural modifications required by PVA/S-PVA modes that reduce aperture ratio, thus maintaining larger pixel area while improving viewing characteristics.
3Ease of operation
If high gamma and low gamma periods are divided in same duration, then driving simplicity is maintained, but moving checker artifacts occur due to luminance differences
Solution Approach 1:
The patent modifies the duration parameter of the driving periods, making the low gamma period longer than the high gamma period. This parameter change prevents moving checker artifacts by compensating for liquid crystal response velocity differences and achieving more uniform luminance distribution, while still maintaining relatively simple time divisional driving operation.
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 approach enhances side visibility and prevents moving checker artifacts, thereby improving the overall display quality by ensuring sufficient display of the low data voltage despite the slower falling response of the liquid crystal, maintaining stable display quality.
Implementation Method 1
a liquid crystal layer disposed between the first and second substrate. An electric field is generated by voltages applied to the pixel electrode and the common electrode. By adjusting a magnitude of the electric field, a transmittance of a light passing through the liquid crystal layer may be adjusted
Data Source
AI summary
A method of driving a display panel includes generating a high data voltage having a high gamma corresponding to a grayscale of input image data, generating a low data voltage having a low gamma less than the high gamma corresponding to the grayscale of the input image data and outputting the high data voltage and the low data voltage to pixels of a display panel. Of the high data voltage and the low data voltage, only the low data voltage is outputted to the pixels of the display panel during at least one frame.