Liquid Crystal Display Overdrive Method Using Gray Scale Timing
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Solution Overview
Problem
Liquid crystal displays suffer from slow response times due to inherent characteristics of liquid crystals, leading to motion blurring and reduced display quality, with existing overdriving methods being ineffective for gray scale changes and increasing manufacturing costs.
Innovation Solution
A liquid crystal display system with a timing controller and data driving circuit that adjusts the output periods of input and modulation data based on the gray scale level, reducing response time without the need for additional look-up tables or memory, thereby improving picture quality and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If overdriving method is applied to reduce response time, then response time is improved, but manufacturing cost increases due to additional look-up tables and memory
Solution Approach 1:
The patent extracts and removes the look-up table and memory components from the overdriving system. Instead of using external storage devices, the invention implements the overdriving function directly within the data driving circuit using circuit logic that processes gray scale data in real-time, thereby eliminating the need for additional memory and look-up tables while maintaining response time improvement
Solution Approach 2:
The patent replaces the mechanical/memory-based overdriving approach (using look-up tables and memory storage) with an electronic/circuit-based approach. The data driving circuit uses electronic logic and signal processing to achieve overdriving functionality, substituting physical storage mechanisms with electronic computation and timing control
2Loss of time
If overdriving method is applied to reduce response time, then response time is improved, but device complexity increases due to additional hardware components
Solution Approach 1:
The patent merges the overdriving function with the existing data driving circuit functionality. Instead of adding separate overdriving hardware components, the invention integrates the overdriving logic into the data driving circuit itself, combining multiple functions (data driving and overdriving) into a single integrated circuit structure, thereby reducing overall device complexity
Solution Approach 2:
The data driving circuit is designed to perform multiple functions: it simultaneously handles normal data driving operations and overdriving operations. The circuit uses the gray scale data itself to generate control signals that modulate the liquid crystal response, making the data driving circuit universal in its functionality and eliminating the need for dedicated overdriving hardware
3Object-generated harmful factors
If related art overdriving method is used, then motion blurring is reduced, but middle gray scale display quality deteriorates
Solution Approach 1:
The patent implements a dynamic overdriving method where the control signals are adjusted based on the actual gray scale level being displayed. The circuit dynamically modifies the overdriving strength and timing according to the input gray scale data, allowing optimal performance across different gray scale ranges including middle gray scales, rather than using a fixed overdriving approach
Solution Approach 2:
The invention changes the parameters of the overdriving operation based on the gray scale level. By monitoring the gray scale data and adjusting the overdriving control signals accordingly, the system optimizes the overdriving effect for different display conditions, preventing the deterioration of middle gray scale quality while maintaining motion blur reduction
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 solution effectively reduces response time and enhances picture quality by adjusting output periods in proportion to the gray scale level, specifically improving the display's performance for middle gray scales and reducing product volume and manufacturing costs.
Implementation Method 1
a liquid crystal display controls the light transmittance of liquid crystal cells using an electric field to display a picture
Implementation Method 2
VF represents a freederick transition voltage at which liquid crystal molecules begin to perform a tilt motion
Implementation Method 3
τf represents a falling time at which a liquid crystal is returned to an initial position by an elastic restoring force after a voltage applied to the liquid crystal is turned-off
Data Source
AI summary
A liquid crystal display including a timing controller generating a source output enable signal that controls the drive of an input data, and a data driving circuit modulating the input data to generate a modulation data, sequentially outputting the input data and the modulation data, and adjusting output periods of the input data and the modulation data based on a gray scale level of the input data.