Liquid Crystal Display Driving Method for Response Speed
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Solution Overview
Problem
Liquid crystal display apparatuses in vertically aligned mode and normally black mode face issues with response speed and image deterioration due to varying response speeds across different areas within a pixel, leading to excessive brightness or incomplete gradation transitions.
Innovation Solution
A driving method that corrects target gradations to facilitate gradation transitions while judging and adjusting for areas with different response speeds, using replacement steps to prevent excessive brightness and angular responses, ensuring both fast response and high display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a voltage is supplied to facilitate gradation transition in vertically aligned mode liquid crystal cells, then response speed is improved, but areas with different response speeds coexist causing image deterioration such as excessive brightness or incomplete gradation transitions
Solution Approach 1:
The patent applies local quality by differentiating control strategies for different areas within a pixel. The liquid crystal cell is divided into a first area (near pixel electrode) with fast response and a second area (away from electrode) with slow response. Different voltage waveforms and gradation correction methods are applied to each area to optimize their respective transitions, preventing image deterioration while maintaining fast response overall.
Solution Approach 2:
The patent changes voltage parameters dynamically based on the current gradation and target gradation. By adjusting voltage levels and waveforms according to the specific transition required, the system optimizes response speed for each gradation change while preventing excessive brightness or incomplete transitions in different pixel areas.
2Speed
If driving signal is modulated to facilitate gradation transition, then response speed improves, but display quality deteriorates due to excessive brightness or black trails
Solution Approach 1:
The patent implements feedback by judging whether the current gradation and target gradation combination corresponds to a predetermined first combination that causes image deterioration. Based on this judgment, the system selectively applies gradation correction or replacement, ensuring that display quality is maintained while still improving response speed when appropriate.
Solution Approach 2:
The patent performs preliminary action by replacing the desired target gradation with a predetermined first gradation before the actual driving occurs, when the current gradation and target gradation form a problematic combination. This preventive measure avoids image deterioration before it happens, ensuring display quality is maintained.
3Loss of time
If gradation transition is facilitated by supplying higher voltage, then response time decreases, but excessive brightness occurs in fast-response areas
Solution Approach 1:
The patent addresses brightness uniformity by applying different control strategies to different areas. The first area near the pixel electrode receives controlled voltage to prevent excessive brightness, while the second area away from the electrode receives sufficient voltage to complete gradation transition, achieving both fast response and uniform brightness.
Solution Approach 2:
The patent applies partial action by selectively facilitating gradation transition only when necessary. By judging whether the current and target gradation combination is problematic, the system applies voltage facilitation only in needed cases, preventing excessive brightness while still improving response time when beneficial.
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 improves response speed and prevents image deterioration by optimizing gradation transitions across pixels with varying response speeds, maintaining high display quality and reducing occurrences of excessive brightness and black trails.
Implementation Method 1
a nematic liquid crystal having a negative dielectric anisotropy property
Implementation Method 2
when a voltage is supplied, the liquid crystal molecules align obliquely in accordance with an electric field formed obliquely with respect to the surface of the substrate
Implementation Method 3
absorption axes of polarization plates provided on both sides of the liquid crystal cell are disposed so as to be orthogonal to each other
Data Source
AI summary
A liquid crystal display apparatus includes a plurality of areas in which response speeds greatly different from each other coexist in a pixel. A first replacement process section replaces the image data of the desired target frame with a first gradation, when a gradation transition from a current frame to a desired target frame corresponds to the above gradation transition. A second replacement process section replaces the image data of the current frame with a second value. The first value is set to a value causing the pixel to respond at a relatively higher speed without the occurrence of the excessive brightness. Without avoiding the deterioration of the image, it is possible to drive a liquid crystal display apparatus including areas whose response speeds are different from each other coexist in the pixel, such as a liquid crystal display apparatus of vertically aligned mode and normally black mode.