LCD Touch Screen Resistor Network for Block Dim Prevention
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Solution Overview
Problem
LCD devices with buried touch screens experience image quality deterioration due to residual electric charges causing block dim issues, as common electrodes have different potentials when not driven, leading to uneven charge distribution across pixel cells.
Innovation Solution
Incorporating resistors connected to common electrode lines to maintain equivalent potential across common electrodes, allowing for discharge of residual charges and preventing potential differences, thus ensuring uniform electric potential during both display and non-display periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If common electrodes are used as touch sensing lines without equivalent potential units, then the device structure is simpler, but residual electric charges cause potential differences leading to block dim issues and image quality deterioration
Solution Approach 1:
Resistors are introduced as intermediary components connected to common electrode lines to discharge residual electric charges and maintain equivalent potential across all common electrodes, thereby preventing block dim issues without significantly complicating the overall device structure
Solution Approach 2:
The patent applies equipotentiality by ensuring all common electrodes maintain the same electric potential through the addition of resistors that discharge residual charges, eliminating potential differences that cause image quality deterioration while the display is inactive
2Reliability
If common electrodes maintain different potentials during non-display periods, then charge distribution is simpler, but this causes uneven charge distribution and block dim issues affecting image quality
Solution Approach 1:
The resistors connected to common electrode lines ensure that all common electrodes maintain equivalent potential during non-display periods, preventing uneven charge distribution and block dim issues while preserving initial image quality without requiring complex control mechanisms
3Reliability
If resistors are added to common electrode lines to maintain equivalent potential, then block dim issues are prevented and image quality is improved, but the device structure becomes more complex
Solution Approach 1:
Resistors serve as simple intermediary components that passively maintain equivalent potential across common electrodes by discharging residual charges, improving image quality consistency without requiring active control circuits or complex mechanisms
Solution Approach 2:
The resistors automatically discharge residual electric charges from common electrodes during non-display periods, maintaining equivalent potential and preventing block dim issues without requiring external control or intervention, thereby improving reliability with minimal added complexity
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 solution prevents block dim issues by ensuring all common electrodes have the same electric potential, improving initial image quality and maintaining it over time by effectively managing electric charges across the liquid crystal panel.
Implementation Method 1
an equivalent potential unit, electrically connected to the common electrode lines, and allow the common electrodes to have an equivalent potential
Implementation Method 2
detecting a touch point of the liquid crystal panel according to a capacitance that is induced in the common electrodes
Data Source
AI summary
A Liquid Crystal Display (LCD) device includes a liquid crystal panel in which a plurality of common electrodes are formed; an interred touch sensor for applying a common voltage to the common electrodes, and detecting a touch point of the liquid crystal panel with a capacitance that is induced in the common electrodes; a plurality of common electrode lines for connecting the common electrodes to the touch sensor; and an equivalent potential unit formed in the common electrode lines, and discharging residual electric charges of the common electrodes.