Liquid Crystal Driving System With Decimal Gray Scale Overdrive
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Solution Overview
Problem
Existing liquid crystal driving systems are unable to provide an effective overdrive function when displaying the highest or lowest gray scale values, resulting in delayed response times and poor display quality during moving images.
Innovation Solution
A liquid crystal driving system that includes an overdrive unit, a gray scale converter, and a look-up table unit, which compares current and previous frames to determine dynamic or static states, and generates overdrive signals using a second group of gray scale values with decimal points, allowing for improved overdrive functionality at all gray scale levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional overdrive method is used with integer gray scale values, then the system is simple to implement, but it cannot provide effective overdrive function at highest or lowest gray scale values
Solution Approach 1:
The patent changes the parameter of gray scale values from integer only to include decimal point values. By introducing decimal gray scale values (e.g., 254.5, 0.5), the system can provide effective overdrive signals even at the highest (255) and lowest (0) gray scale levels, where traditional integer-based overdrive would fail. This parameter change enables the overdrive function to work reliably across all gray scale ranges.
2Loss of time
If higher electrical voltage is applied to liquid crystal molecules, then the response time is reduced, but the display quality may deteriorate due to delay when liquid crystal molecules cannot catch up with screen refresh rate
Solution Approach 1:
The patent applies preliminary action by calculating and preparing overdrive signals in advance based on the relationship between current and previous frame gray scale values. The overdrive unit determines the appropriate overdrive signal before the actual display update, allowing the liquid crystal molecules to be pre-conditioned for the upcoming state change. This preliminary preparation enables faster response without causing display quality deterioration from sudden voltage changes.
3Speed
If the liquid crystal molecules are forced to turn to the required angle within a prearranged period of time using overdrive voltage, then the response time is shortened, but the system becomes unable to handle extreme gray scale values
Solution Approach 1:
The patent adds another dimension to the gray scale value system by introducing decimal precision to the traditionally integer-based gray scale values. This dimensional change from discrete integer steps to continuous decimal values provides additional intermediate states that can be used for overdrive signaling. The decimal gray scale values create an expanded value space that enables overdrive functionality at extreme gray scale levels while maintaining fast response speed.
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 system enables the liquid crystal driving system to perform the overdrive function effectively at both highest and lowest gray scale values, reducing response time and improving display quality by utilizing decimal point gray scales to expand the range of gray scale values, thus addressing the limitations of prior art.
Implementation Method 1
By providing a specific electrical voltage to the liquid crystal molecules of each pixel unit 121, the spinning angle of the liquid crystal molecules can be changed
Implementation Method 2
The liquid crystal display overdrive technology is to apply an overdrive control voltage VOD (VOD is the control voltage of angle θ2) to a pixel unit in advance, and thus the time shortens to t1 for turning the liquid crystal molecules to the angle θ1
Data Source
AI summary
A method for driving a liquid crystal display includes: a) receiving a video signal from a first group of gray scales values; b) comparing a current frame of the video signal with a previous frame to determine whether the current frame is in a static state or in a dynamic state; c) when the current frame is determined to be in the static state, converting the video signal to a driving signal; d) when the current frame is determined to be in the dynamic state, calculating a overdrive signal. The value of the driving signal is selected from a second group of gray scale values having at least one decimal point gray scale and having the same number of gray scale values as that of the first group of gray scale values. The value of the overdrive signal is selected from the first group of gray scale values.