Liquid Crystal Display Source Line Correction Ripple Control
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Solution Overview
Problem
Existing liquid crystal display devices face issues with improper displays due to breaks in source lines, which are corrected using auxiliary lines, leading to luminance differences and the appearance of black lines, as the capacitive coupling between control signal lines and source lines induces ripple signals, affecting the effective drain voltage and luminance.
Innovation Solution
The liquid crystal display device incorporates a control signal that rises at a different timing from the fall in the gate signal, delaying the ripple signal's impact on the source signal, and is configured to switch source signals between voltage levels in response to the control signal changing from the ON to the OFF voltage level, thereby preventing the ripple signal from being written to the pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If auxiliary lines are used to correct breaks in source lines, then display continuity is improved, but luminance uniformity deteriorates due to ripple signals
Solution Approach 1:
The invention applies preliminary action by delaying the control signal rise timing relative to the gate signal fall timing. This timing adjustment prevents the ripple signal from being written to the pixel before the gate is closed, thereby preventing luminance non-uniformity while maintaining display continuity through auxiliary line correction
Solution Approach 2:
The invention changes the timing parameter of the control signal by adjusting its rise timing to occur after the gate signal fall timing. This parameter modification shifts the ripple signal occurrence to a period when the gate is closed, eliminating the harmful effect on pixel luminance while preserving the auxiliary line's ability to restore display continuity
2Speed
If control signal rises at the same timing as gate signal falls, then switching speed is improved, but ripple signal interference worsens
Solution Approach 1:
The invention uses the gate signal fall timing as an intermediary marker to adjust the control signal rise timing. By introducing this timing offset, the ripple signal is shifted to occur after the gate closes, acting as a mediator that separates the harmful ripple effect from the pixel writing period while maintaining efficient switching
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 the occurrence of black lines and improper displays when correcting breaks in source lines, maintaining consistent luminance across the display by isolating the ripple signal from the source signal's timing, thus enhancing display quality.
Implementation Method 1
the capacitive coupling between control signal lines and source lines induces ripple signals
Data Source
AI summary
A liquid crystal display device includes: a display area; a non-display area; a plurality of gate lines; a plurality of source lines; a plurality of thin film transistors; a gate driver; a source driver; a control unit configured to supply a control signal to the source driver; and an auxiliary line extending in the non-display area from an end of one of the plurality of source lines to another end thereof, wherein each of the plurality of thin film transistors is turned on and off when one of the plurality of gate signals supplied to one of the plurality of gate lines connected to that thin film transistor changes to an ON voltage level and an OFF voltage level respectively, and the control signal rises at a different timing from a fall in one of the plurality of gate signals.