LCD Data Converting Device for Interlace Signal Processing
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Solution Overview
Problem
LCD devices struggle to directly display interlace type image signals due to their progressive displaying method, leading to issues like afterimages and flicker when attempting to invert pixel data polarity by a two-field unit.
Innovation Solution
A data converting device with a polarity signal generating part that inverts polarities of data signals by a period of at least two fields and a data varying part that adjusts data signals differently within these periods, allowing the LCD device to handle interlace type image signals by generating bi-polarity signals and varying data signals to prevent residual DC voltage accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If interlace type image signals are directly displayed on LCD device using progressive displaying method, then device complexity is reduced, but image quality deteriorates due to afterimages and flicker
Solution Approach 1:
The patent applies parameter changes by converting interlace type image signals into progressive type image signals through a signal converting unit. This transformation changes the temporal and spatial parameters of the image data, allowing the LCD device to display interlace signals without afterimages and flicker while maintaining simple progressive scanning operation. The conversion process reorganizes the field-sequential interlace data into frame-sequential progressive data structure.
2Reliability
If polarity of pixel data is inverted by two-field unit to prevent afterimages, then image quality is improved, but flicker occurs due to residual DC voltage
Solution Approach 1:
The patent uses inversion principle by converting the display method from interlace to progressive type, inverting the fundamental approach to eliminate the need for polarity inversion. The signal converting unit transforms the interlace signal structure into progressive signal structure, which naturally prevents afterimages without requiring additional polarity inversion operations that would cause flicker.
Solution Approach 2:
The patent applies preliminary action by performing signal conversion before display. The signal converting unit pre-processes the interlace type image signals into progressive type signals before they reach the display panel, eliminating potential image quality issues in advance rather than correcting them through post-processing polarity inversion.
3Reliability
If interlace type image signals are converted to progressive type, then image quality is improved by eliminating afterimages and flicker, but device complexity increases due to signal converting unit
Solution Approach 1:
The patent introduces an intermediary element - the signal converting unit - that mediates between the interlace type image signals from the broadcast and the progressive type display requirements of the LCD device. This intermediary performs the necessary signal transformation, enabling compatibility between different signal types while maintaining high image quality without afterimages or flicker.
Data Source
AI summary
Provided are a data converting device for improving image quality, a method thereof, and an LCD device having the same. The data converting device includes a polarity signal generating part and a data varying part. The polarity signal generating part generates a polarity signal inverting polarity of a data signal in turns by a period of n fields. The data varying part differently varies data signals corresponding to respective field periods within the period of the n fields.