LCD Nonlinear Resistance Elements for Image Retention Discharge
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Solution Overview
Problem
Existing liquid crystal displays (LCDs) face the issue of image retention when suspending display, where electric charge remains in the pixel electrode, leading to unwanted display persistence, and existing solutions either require costly ICs or fail to prevent charge retention effectively.
Innovation Solution
Incorporating nonlinear resistance elements connected to scanning and signal lines via short ring lines, allowing independent voltage application to these elements to discharge retained electric charge and prevent image retention during display suspension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nonlinear resistance elements are connected to scanning and signal lines via short ring lines with independent voltage application, then image retention is prevented effectively, but device complexity increases
Solution Approach 1:
The patent divides the discharge circuit into separate first nonlinear resistance elements connected to scanning lines and second nonlinear resistance elements connected to signal lines. Each set of lines has its own dedicated discharge path, allowing independent voltage application and discharge control. This segmentation enables effective image retention prevention while maintaining manageable circuit complexity through modular design.
2Reliability
If costly ICs are used to prevent image retention, then charge discharge effectiveness is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive IC components with simpler, cheaper nonlinear resistance elements that can be implemented using standard semiconductor materials and processes. These nonlinear resistance elements provide the necessary charge discharge function without requiring complex integrated circuitry, thereby significantly reducing manufacturing costs while maintaining effective image retention prevention.
3Reliability
If existing solutions are used to discharge pixel electrode charge, then image retention is partially addressed, but charge retention in scanning and signal lines remains
Solution Approach 1:
The patent creates a universal discharge system that handles multiple charge retention problems simultaneously. The first nonlinear resistance elements discharge charge from scanning lines, while the second nonlinear resistance elements discharge charge from signal lines. This multi-functional approach comprehensively addresses all sources of charge retention in the display system, not just the pixel electrode.
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 configuration effectively prevents image retention with a simple setup by ensuring all scanning and signal lines are properly discharged, reducing the risk of display persistence and lowering the cost of the scanning-line driving circuit.
Implementation Method 1
a plurality of first nonlinear resistance elements which are formed respectively in the plurality of scanning lines; each of the plurality of first nonlinear resistance elements is connected to one of the plurality of scanning lines at one end, and is connected to a first short ring line at another end
Data Source
AI summary
A liquid crystal display includes scanning lines and signal lines arranged in a matrix pattern on a TFT substrate, a pixel being formed at a crossing portion of each scanning line and each signal line, and including a TFT that is connected to each scanning line and each signal line, first nonlinear resistance elements formed respectively in the scanning lines, each of which being connected to one scanning line at one end thereof and to a short ring power-supply line for a scanning line at another end thereof, and second nonlinear resistance elements formed respectively in the signal lines, each of which being connected to one signal line at one end thereof and to a short ring power-supply line for a signal line at another end thereof. A voltage is applied to the first and second nonlinear resistance elements independently of each scanning line and each signal line.