Overdriving Data Generator for Liquid Crystal Display Response Delay
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Solution Overview
Problem
Liquid crystal display devices suffer from motion blurring due to response delay, and existing over driving methods are ineffective for highest and lowest gray levels, degrading display quality.
Innovation Solution
An (n+1)-bit data drive IC generates 2(n+1) level voltages, allowing for over driving across all gray levels, including the highest and lowest, by using positive and negative level voltages symmetrically arranged around a common voltage, and a data processing circuit with a look-up table compares frame data signals to generate appropriate over driving data signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an over driving method is used to compensate for liquid crystal response delay, then motion blurring is reduced, but the highest and lowest gray levels cannot be properly displayed
Solution Approach 1:
The patent extends the over driving voltage range beyond the traditional gray level boundaries by introducing voltages higher than the highest gray level voltage and lower than the lowest gray level voltage. This dimensional extension allows over driving to be applied uniformly across all gray levels including the extremes, resolving the limitation where conventional over driving failed at boundary gray levels.
Solution Approach 2:
The patent changes the voltage parameter range by generating over driving voltages that exceed the minimum and maximum gray level voltages. By expanding the voltage parameter space and using a data drive IC with increased bit resolution (n+1 bits), the system can select from a broader range of voltage levels to effectively over drive all gray levels without being constrained by the original gray level boundaries.
2Manufacturing precision
If a data drive IC with n bits is used to generate 2n gray level voltages, then the display resolution is maintained, but over driving cannot be applied to the highest and lowest gray levels
Solution Approach 1:
The patent transitions from an n-bit data drive IC to an (n+1)-bit data drive IC, effectively adding another dimension to the voltage generation capability. This bit expansion enables the generation of 2(n+1) voltage levels, creating voltages that extend beyond the original 2n gray level range, thereby enabling over driving for all gray levels including the extremes while maintaining precision.
Solution Approach 2:
By increasing the bit resolution of the data drive IC from n bits to (n+1) bits, the patent changes the fundamental parameter of voltage level granularity. This parameter change allows for finer voltage control and extends the available voltage range, enabling the selection of over driving voltages that are appropriate for all gray levels without compromising the precision of gray level display.
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 ensures that all gray levels, including the highest and lowest, are properly displayed, improving dynamic contrast ratio and overall display quality by compensating for response delay and enhancing the over driving method's effectiveness.
Implementation Method 1
An (n+1)-bit data drive IC generates 2(n+1) level voltages
Implementation Method 2
A voltage applied between the electrodes induces an electric field across the layer of liquid crystal molecules. Alignment of the liquid crystal molecules changes in accordance with the intensity of the induced electric field
Data Source
AI summary
A liquid crystal display device is provided. The liquid crystal display device includes an over driving data generator that compares a gray level of a data signal of a present frame with a gray level of a data signal of a previous frame to output an over driving data signal. The data signal has a bit number of n. A data drive IC generates level voltages having a number of more than 2n and outputs one of the level voltages of the over driving data signal. A liquid crystal panel includes a pixel applied with the one of the level voltages.