Cholesteric Liquid Crystal Display Crosstalk Reduction
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Solution Overview
Problem
Cholesteric liquid crystal displays suffer from crosstalk issues due to residual driving voltages accumulating on row and column lines, leading to undesired greyscale display on unactivated pixels, which negatively impacts display quality.
Innovation Solution
A cholesteric liquid crystal display device with a liquid crystal driving unit that applies row and column driving voltages to designated pixels based on input signals and activates a power-down signal to reduce and reset these voltages to zero, preventing residual voltage buildup and crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving voltages are applied to row and column lines for pixel activation, then pixel switching between focal conic and planar states is achieved, but residual voltages accumulate causing crosstalk and undesired greyscale display
Solution Approach 1:
The patent implements periodic voltage reset cycles by introducing a power-down signal that periodically reduces row and column driving voltages to a power-down level after a predetermined time period following pixel activation. This periodic action prevents residual voltage accumulation and eliminates crosstalk between pixels, thereby resolving the contradiction between achieving pixel switching and preventing harmful residual voltages.
Solution Approach 2:
The patent applies the discarding and recovering principle by intentionally discarding (reducing to power-down level) the residual driving voltages on row and column lines after they have served their purpose of activating pixels. The voltages are then recovered (restored) for subsequent pixel activation cycles. This process prevents harmful voltage accumulation while maintaining the functionality of the display system.
2Stability of the object's composition
If continuous driving voltages are maintained on row and column lines, then pixel state maintenance is achieved, but voltage residue accumulates causing crosstalk
Solution Approach 1:
Instead of maintaining continuous driving voltages, the patent implements periodic voltage application followed by power-down periods. After activating pixels with driving voltages, the system waits for a predetermined time period and then applies a power-down signal to reduce voltages to power-down level. This periodic action maintains liquid crystal alignment stability during active periods while preventing voltage residue accumulation during power-down periods.
Solution Approach 2:
The patent applies preliminary anti-action by proactively reducing driving voltages to power-down level before residual voltages can accumulate to harmful levels. The power-down signal is activated after a predetermined time period following pixel activation, preemptively counteracting the potential buildup of voltage residues that would cause crosstalk and display defects.
Data Source
AI summary
A cholesterol liquid crystal display device includes a liquid crystal display panel and a liquid crystal driving unit. The liquid crystal display panel has a plurality of pixels. The liquid crystal driving unit applies row driving voltages and column driving voltages to a designated pixel according to the input signal. After the input signal is transmitted, the liquid crystal driving unit activates the power-down signal within a certain period of time to reduce the row driving voltage and the column driving voltage applied to the specified pixel. Thereby, the crosstalk phenomenon on the cholesteric liquid crystal display device can be improved.