Liquid Crystal Display Data-Line Driving Circuit Potential Correction
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in reducing the difference between the potential that pixel circuits should reach and the actual potential they achieve, leading to image quality deterioration due to parasitic capacitance, wiring resistance, and insufficient transistor driving capability.
Innovation Solution
A liquid crystal display device with a data-line driving circuit that selectively outputs potentials of positive or negative polarity, adjusting the output potentials to ensure the lowest positive polarity is lower than the lowest grayscale potential and the highest negative polarity is higher than the highest grayscale potential, thereby reducing the potential difference across pixel circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional data-line driving circuit is used to correct the potential indicating display grayscale, then the potential difference between pixel circuits can be reduced, but the circuit cannot output potentials lower than the lowest-level grayscale potential, causing the potential correction to be insufficient when transitioning from highest to lowest grayscale
Solution Approach 1:
The patent extends the output potential range of the data-line driving circuit beyond the conventional grayscale potential range. Specifically, it enables output of potentials lower than the lowest positive grayscale potential and higher than the highest negative grayscale potential. This parameter extension allows the circuit to provide sufficient potential difference for effective correction of pixel circuit potentials during grayscale transitions, particularly from highest to lowest grayscale, thereby resolving the limitation of conventional circuits.
2Manufacturing precision
If the potential correction is increased to reduce the potential difference within horizontal period, then image quality improves, but the circuit complexity increases due to additional correction mechanisms
Solution Approach 1:
The patent achieves enhanced potential correction capability without significantly increasing circuit complexity by making the data-line driving circuit multi-functional. The same driving circuit structure is used to both drive the data lines and provide potential correction, eliminating the need for separate correction circuits. The extended output potential range allows a single circuit to perform both driving and correction functions effectively, thereby improving potential difference reduction while maintaining relatively simple circuit architecture.
Data Source
AI summary
Provided is a liquid crystal display device, including: a data line; a plurality of pixel circuits; an output grayscale value generating circuit for outputting an output grayscale value obtained by correcting a display grayscale value indicating a grayscale potential having one of positive polarity and negative polarity; and a data-line driving circuit for selectively outputting an output potential having one of positive polarity and negative polarity corresponding to the output grayscale value to the data line. The data-line driving circuit outputs the potential so that the positive-polarity output potential corresponding to a smallest output grayscale value becomes lower than a positive-polarity grayscale potential indicated by a smallest one of the display grayscale values and that the negative-polarity output potential corresponding to the smallest output grayscale value becomes higher than a negative-polarity grayscale potential indicated by the smallest one of the display grayscale values.