Display Data Line Alternating for Horizontal Line Defect Compensation
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Solution Overview
Problem
In display devices with an N-dot alternating structure, a horizontal line defect occurs due to reduced charging rates in certain pixel rows, leading to display quality issues when transitioning between pixel columns, especially when displaying single or mixed color images.
Innovation Solution
The display device employs a data driver that alternately applies data voltages with emphasis voltages to data lines connected to adjacent pixel columns, compensating image data by incrementing gray levels in specific pixel rows and columns to maintain consistent charging rates across the display panel, thereby preventing horizontal line defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a N-dot alternating structure is used to reduce power consumption, then power consumption is reduced, but horizontal line defects occur due to reduced charging rates in certain pixel rows
Solution Approach 1:
The patent applies different data voltages to different pixel rows based on their specific charging rate characteristics. Pixels in the first pixel row receive a first data voltage while pixels in the second pixel row receive a second data voltage, allowing localized compensation for the reduced charging rate in specific rows without affecting the overall power consumption benefits of the N-dot alternating structure.
Solution Approach 2:
The patent changes the data voltage parameter applied to pixels based on their row position and charging rate. By adjusting the data voltage level dynamically for different pixel rows, the system compensates for the reduced charging rate in the first pixel row while maintaining the power-efficient N-dot alternating driving structure.
2Reliability
If data voltage polarity is reversed per pixel column (column inversion) to prevent liquid crystal deterioration, then liquid crystal deterioration is prevented, but crosstalk between adjacent pixels increases
Solution Approach 1:
The patent segments the pixel array into multiple pixel rows and applies different driving schemes to different segments. By dividing pixels into first pixel rows and second pixel rows with different data voltage applications, the system reduces crosstalk between adjacent pixels while still preventing liquid crystal deterioration through polarity reversal over time.
Solution Approach 2:
The patent implements periodic polarity reversal of data voltages applied to pixel columns over multiple frames. This periodic action prevents liquid crystal deterioration by ensuring that adjacent pixels do not continuously maintain the same polarity relationship, while the N-dot alternating structure reduces crosstalk compared to continuous column inversion.
Data Source
AI summary
A display device includes a display panel including first color pixels in a first pixel column, second color pixels in a second pixel column, third color pixels in a third pixel column, a first data line connected to the second color pixels in first through N-th pixel rows and connected to the first color pixels in (N+1)-th through 2N-th pixel rows, and a second data line connected to the third color pixels in the first through N-th pixel rows and connected to the second color pixels in the (N+1)-th through 2N-th pixel rows, where N is an integer greater than 1, and a data driver which applies a first polarity data voltage to the first data line, and applies a second polarity data voltage to the second data line.