Adaptive Polarity Control for Liquid Crystal Displays

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Solution Overview

Problem

Existing liquid crystal displays face degradation in display quality due to biased polarity patterns, particularly in 'problem patterns' like alternating white and black data in subpixels or pixels, which requires adaptive polarity control to prevent image degradation, and existing solutions are not efficient without large-capacity memory.

Innovation Solution

A liquid crystal display system with a register storing pixel and polarity pattern information, a block pattern recognition unit, a line pattern recognition unit, and a polarity control signal generating unit that compares input data to threshold values to determine problem patterns and generate vertical and horizontal polarity control signals, allowing adaptive polarity adjustments without additional memory.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a fixed polarity pattern is used in the liquid crystal display, then the device complexity is reduced, but display quality degrades when problem patterns are detected

Engineering Contradiction:

Improvedisplay qualityVSAvoidpolarity control system

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements dynamic polarity pattern selection by detecting problem patterns in real-time and switching between different polarity patterns (e.g., 1V POL inversion, 2V POL inversion, 3V POL inversion) based on the detected pattern type. This allows the system to adapt to various problem patterns including alternating white and black data in subpixels, pixels, and interlace data, thereby maintaining display quality without requiring a completely fixed system.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the polarity control parameters dynamically by selecting different inversion patterns (1V, 2V, 3V) based on the detected problem pattern. The polarity control signal generating unit modifies the polarity parameters in response to detected patterns, enabling the display to handle various problematic image patterns while maintaining optimal display quality.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If an adaptive polarity control system is implemented to handle various problem patterns, then display quality is maintained, but the device requires large-capacity memory to store multiple polarity patterns

Engineering Contradiction:

Improvedisplay qualityVSAvoidmemory capacity

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent segments the polarity control into multiple discrete inversion patterns (1V POL inversion, 2V POL inversion, 3V POL inversion) that can be selectively applied. Instead of storing complete polarity patterns for all possible problem patterns, the system divides the solution into manageable segments that can be chosen based on the detected problem type, reducing memory requirements while maintaining adaptability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system uses inversion-based polarity control methods (1V inversion, 2V inversion, 3V inversion) to handle problem patterns. By inverting the polarity control approach and using mathematical relationships between different inversion patterns, the system can derive appropriate polarity adjustments without requiring extensive memory storage for all possible patterns.

Inventive Principle:

Principle #13The other way round (Inversion)

3Reliability

If problem pattern detection and adaptive polarity control are implemented, then display quality degradation is prevented, but the processing time and computational load increase

Engineering Contradiction:

Improvedisplay qualityVSAvoidprocessing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system implements partial pattern detection by focusing on specific problem patterns (alternating white and black data in subpixels, pixels, and interlace data) rather than analyzing all possible image patterns. The block pattern recognition unit and line pattern recognition unit perform targeted detection, and threshold-based comparison allows for quick decision-making, reducing processing time while effectively handling the most common problem patterns.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS9275590B2Liquid crystal display and driving method capable of adaptively changing a problem pattern

Publication Date: 2016.03.01 LG DISPLAY CO LTD

AI summary

A liquid crystal display and a driving method thereof are provided. The liquid crystal display includes a liquid crystal display panel, a register for storing pixel information of a problem pattern and polarity pattern information, a block pattern recognition unit for comparing input data with the problem pattern to count the number of problem patterns contained in the input data and comparing the count value with a first threshold value, a line pattern recognition unit for determining the line containing the problem pattern as a problem line, a frame pattern recognition unit for comparing the number of problem lines with a second threshold value, and determining the frame containing the input data as a problem frame, a polarity control signal generating unit for generating vertical and horizontal polarity control signals, and source drive integrated circuits (ICs) for controlling the vertical and horizontal polarities of data voltages supplied to the data lines.