Liquid Crystal Display SOE Masking for Stripe Elimination
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Solution Overview
Problem
Liquid crystal display devices experience screen quality deterioration due to prolonged on-state of thin film transistors during initial driving, leading to visible stripes on the screen.
Innovation Solution
A method and device that utilize a source output enable (SOE) masking signal to inhibit gradation voltage data transfer during a predetermined masking interval, ensuring complete turn-off of thin film transistors and preventing initial data from being applied to the liquid crystal cells, thereby improving screen quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the TFTs are driven with gate high voltage during initial driving, then the pixel signals are applied to the liquid crystal cells, but the TFTs remain in prolonged on-state causing screen quality deterioration and stripe artifacts
Solution Approach 1:
The patent applies a preliminary action by introducing a masking interval before the normal data transfer begins during initial driving. This masking interval prevents the TFTs from being activated too early, allowing them to complete their turn-off before receiving data signals, thereby avoiding the prolonged on-state issue while maintaining normal driving speed
2Ease of operation
If the gate driver outputs gate high voltage to turn on TFTs, then pixel data transfer is enabled, but initial data is incorrectly applied to liquid crystal cells causing visible stripes
Solution Approach 1:
The patent applies preliminary anti-action by using a masking signal that actively prevents (inhibits) the data driver from outputting data signals during the critical initial period when TFTs are still turning off. This counteracts the harmful effect of premature data application that would cause stripe artifacts, while still allowing normal data transfer operation afterward
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
Prevents screen quality deterioration by ensuring complete turn-off of thin film transistors during initial driving, eliminating unwanted initial data and reducing the occurrence of stripes on the screen, thus enhancing display quality.
Implementation Method 1
The liquid crystal display device displays images by using an optical anisotropy of a liquid crystal
Implementation Method 2
Each liquid crystal cell is associated with a pixel electrode and a common electrode facing each other. The pixel electrode is connected to a TFT and stores a pixel signal, thereby forming a liquid crystal capacitor
Data Source
AI summary
A liquid crystal display device includes a liquid crystal panel, a gate driver, a data driver, and an initial driving control unit. The liquid crystal panel includes a plurality of liquid crystal cells. Each liquid crystal cell is defined by a gate line, a data line and a thin film transistor. The gate driver controls the thin film transistor connected to the gate line of each liquid crystal cell according to a gate control signal. The data driver outputs a pixel signal to the data line of the each liquid crystal cell according to a data control signal. The data driver includes a switch connected to the data line of the each liquid crystal cell. The initial driving control unit is structured to compare a clock count with a predetermined reference value and operable to alternately generate a first state signal and a second state signal based on the comparison. The unit applies the first state signal to the switch during a masking interval. The pixel signal is not output to the data line during the masking interval.