Display Panel Segmented Data Lines Extend Charge Period
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Solution Overview
Problem
Large liquid crystal display panels face issues with RC time delay, leading to decreased charging ratios and display quality problems such as low luminance, color mixing, and ghosting due to increased resistance-capacitance time delays, especially in areas farthest from the gate driving part.
Innovation Solution
The display apparatus is designed with a method where both first and second data lines of pixel columns are simultaneously driven, along with corresponding gate lines, extending the charging time of each pixel to 2H scan periods, and employing a column inversion mode to reduce power consumption and kickback differences between odd and even-numbered pixel rows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display area is increased to make the panel bigger, then the display area is improved, but RC time delay increases causing charging ratio to decrease
Solution Approach 1:
The pixel array is divided into multiple pixel rows and columns, with gate lines and data lines organized in a segmented manner. This segmentation allows for better management of signal transmission paths and reduces the cumulative RC time delay effect by distributing the charging load across multiple organized segments rather than a single large array.
Solution Approach 2:
The patent implements a periodic scanning mechanism where gate signals are applied sequentially to different pixel rows in a periodic fashion. This periodic action allows sufficient charging time for each row before moving to the next, ensuring that even in large display areas, each pixel row receives adequate charging duration to maintain proper charging ratio despite the increased overall RC time delay.
2Area of stationary object
If the display area is increased to make the panel bigger, then the display area is improved, but display quality deteriorates due to RC time delay
Solution Approach 1:
By segmenting the display into multiple pixel rows and columns with organized gate and data lines, the patent reduces the maximum distance any single pixel is from its control lines. This segmentation prevents the RC time delay from degrading display quality in distant regions.
Solution Approach 2:
The periodic scanning of pixel rows ensures that each row is activated and charged during its specific time window, maintaining consistent charging ratios across the entire display area. This periodic action prevents display quality issues such as incomplete charging, ghosting, and color mixing that would otherwise occur in large panels.
3Reliability
If charging time is extended to 2H scan periods, then charging ratio is improved, but power consumption increases
Solution Approach 1:
The patent uses periodic scanning where gate signals are applied to different pixel rows at different time periods rather than simultaneously to all rows. This periodic action extends the effective charging time for each row to 2H scan periods while distributing the power consumption across time, preventing peak power demands and reducing overall power consumption compared to simultaneous charging of all pixels.
Solution Approach 2:
The gate signals are prepared and applied in advance to specific pixel rows before data signals are written to those rows. This preliminary action ensures that the liquid crystal capacitors are pre-charged to the correct voltage levels, improving charging ratio while optimizing power consumption by avoiding redundant charging operations.
Data Source
AI summary
A display panel includes a plurality of pixels which is arranged in a pixel column and a pixel row, a gate line which is connected to pixels in a same pixel row, a first data line which is connected to pixels in a same pixel column, and a second data line which is connected to remaining pixels except for the pixels connected to the first data line among the pixels in the same pixel column. Two odd-numbered pixel rows and two even-numbered pixel rows are alternately driven so that a charge period of the pixel may be extended by 2H. In addition, a kickback difference between the odd-numbered pixel row and the even-numbered pixel row may be decreased so that a display quality may be improved.