Display Device Gate Line Segmentation for Charging Time
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Solution Overview
Problem
Liquid crystal display (LCD) devices suffer from poor visibility due to afterimages and reduced display quality, primarily because the increased number of unit pixels required for higher resolution leads to decreased charging time for each pixel electrode, hampering the ability to display desired images effectively.
Innovation Solution
The display device employs a matrix arrangement of unit pixels with shared gate lines and charge control lines, allowing simultaneous application of gate turn-on voltage to adjacent gate lines, which increases the time allocated to each gate line for applying the voltage, and uses charge control transistors to manage charge levels in sub-pixels, enhancing visibility and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of unit pixels per unit area is increased to improve resolution, then the resolution increases, but the time available to charge external charges into one pixel electrode is decreased
Solution Approach 1:
The pixel array is divided into even-numbered pixel rows and odd-numbered pixel rows, which are driven by different gate lines. This segmentation allows the display device to process different rows alternately, effectively increasing the charging time available for each pixel electrode while maintaining high resolution through the increased number of unit pixels per unit area.
Solution Approach 2:
The gate lines are driven in an alternating periodic manner, where even-numbered gate lines and odd-numbered gate lines are activated in separate cycles. This periodic action ensures that each gate line has sufficient time to charge its corresponding pixel electrodes before the next cycle begins, thereby resolving the time constraint imposed by high pixel density.
2Measurement precision
If the number of scanning lines is increased to improve resolution, then the resolution increases, but the time available to charge external charges into one pixel electrode is decreased
Solution Approach 1:
The scanning lines (gate lines) are segmented into even-numbered groups and odd-numbered groups, each controlled by separate driving circuits. This segmentation allows the display device to sequentially charge pixels in different rows without time conflict, maintaining adequate charging time even with increased numbers of scanning lines for higher resolution.
Solution Approach 2:
The driving circuit alternates between charging even-numbered pixel rows and odd-numbered pixel rows in periodic cycles. This periodic charging scheme ensures that each gate line receives sufficient time to complete the charging process before the next charging cycle begins, thereby resolving the time constraint imposed by high pixel density.
3Measurement precision
If the number of unit pixels per unit area is increased to improve resolution, then the resolution increases, but the ability to display desired images is hampered due to reduced charging time
Solution Approach 1:
The pixel array is segmented into even and odd rows with separate gate line control, allowing each segment to be charged independently with sufficient time. This segmentation maintains display quality and image fidelity even as resolution increases through higher pixel density.
Solution Approach 2:
The display device uses periodic alternating charging cycles for even and odd pixel rows, ensuring that each pixel electrode receives adequate charging time to accurately represent the desired image. This periodic action prevents image display degradation despite the increased pixel density that defines high resolution.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution improves the display quality by maintaining the allocated time for gate turn-on voltage application even with increased resolution, reducing afterimages, and enhancing the visibility of the displayed images by effectively managing charge levels in sub-pixels.
Implementation Method 1
Changing the electric field changes an orientation of liquid crystal molecules in the liquid crystal layer, and a quantity of light transmitted through the liquid crystal layer is thereby changed to display a desired image
Data Source
AI summary
A display device includes a first unit pixel disposed in a first pixel column and a first pixel row, and a second unit pixel disposed in the first pixel column and a second pixel row adjacent to the first pixel row, and first and second gate lines extending in a row direction and having gate voltage input pads at a terminal portion thereof. First and second data lines extend in a column direction and are connected to the first unit pixel and the second unit pixel, respectively. A first charge control line extends in the row direction and has a charge control gate voltage input pad disposed at a terminal portion thereof. The first gate line is connected to the first unit pixel and the second gate line is connected to the second unit pixel. The first gate line and the second gate line simultaneously receive a same gate pulse.