Liquid Crystal Display Driving Method for Flicker Reduction
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Solution Overview
Problem
High-resolution liquid crystal display devices, particularly those used in Virtual Reality applications, suffer from flicker issues due to the inability to maintain voltage between the pixel electrode and the common electrode for one frame, leading to noticeable flicker and reduced image quality.
Innovation Solution
The proposed solution involves a driving method for liquid crystal display devices where a predetermined voltage is applied to all scanning lines for a predetermined period before starting the active scanning period, ensuring that the voltage is maintained consistently across all pixels, thereby reducing flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high resolution and high-speed response are implemented in liquid crystal display devices, then image quality is improved, but flicker becomes conspicuous
Solution Approach 1:
A predetermined voltage is applied to all scanning lines before the scanning signal is applied to the first scanning line. This preliminary voltage application ensures that voltage is maintained between the pixel electrode and common electrode from the beginning of each frame, preventing flicker in high-resolution displays.
2Speed
If voltage is not held for one frame between pixel electrode and common electrode, then response speed is improved, but flicker occurs
Solution Approach 1:
The predetermined voltage is applied to scanning lines in advance before the frame scanning begins. This ensures that when the pixel electrode and common electrode voltage difference is established, it is maintained consistently throughout the entire frame period, achieving both fast response and flicker reduction.
3Manufacturing precision
If constant voltage is supplied to common electrode and video signal is supplied to each pixel, then image formation is achieved, but voltage cannot be held for one frame leading to flicker
Solution Approach 1:
By applying predetermined voltage to all scanning lines before scanning begins, the voltage between pixel electrode and common electrode is established and maintained for the entire frame period. This preliminary voltage application ensures stable image formation without flicker.
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 effectively reduces flicker in high-resolution liquid crystal display devices, enhancing image quality and moving image characteristics by maintaining a consistent voltage across all pixels, which in turn reduces the shift in optimum common voltage over time.
Implementation Method 1
an image is formed by controlling an alignment direction of liquid crystal molecules by applying a voltage between a pixel electrode and a common electrode
Data Source
AI summary
In a liquid crystal display device, scanning lines, video signal lines and pixels are formed in respective regions enclosed by the scanning lines and the video signal lines. In the liquid crystal display device, a pixel electrode and a thin-film transistor (TFT) are formed in each of the pixels, a first insulating film is formed between a common electrode formed in common for a plurality of pixels and the pixel electrode, the pixel electrode is connected to one of the video signal lines via the TFT, the TFT has a gate connected to one of the scanning lines, a constant common voltage is supplied to the common electrode, the scanning lines are sequentially scanned from a first scanning line in one frame, and a predetermined voltage is applied for a predetermined period to all the scanning lines before a scanning signal is applied to the first scanning line.