Pixel Array With Dual Common Lines For LCD Voltage Management
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Solution Overview
Problem
The high cost and increased complexity of source driving apparatuses in liquid crystal displays (LCDs) due to the need for multiple scan lines and data lines, which also reduce the aperture ratio and lead to defective frames from voltage coupling effects.
Innovation Solution
A pixel array design with two common electrode lines receiving direct and alternating voltages, respectively, to rectify defective frames by maintaining different voltage levels at pixel electrodes, reducing the number of driving apparatuses and costs while improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If one data line is electrically connected to two columns of pixels to reduce the number of data lines, then the cost of source driving apparatus is reduced, but the aperture ratio is reduced
Solution Approach 1:
The pixel array is divided into pixel sets, where each pixel set contains two pixel units sharing common control lines. This segmentation allows efficient use of data lines while maintaining adequate aperture ratio through optimized line routing and spacing.
Solution Approach 2:
The patent introduces a dual-common-line architecture (first common line and second common line) to manage voltage levels independently for each pixel unit within a pixel set. This dimensional addition to the line structure enables cost reduction through shared data lines while preventing aperture ratio degradation through sophisticated voltage management.
2Reliability
If two scan lines are required for driving each row of pixels, then the number of scan lines increases, but the cost of gate driving apparatus increases
Solution Approach 1:
Adjacent pixel units within a pixel set share the first scan line and data line, merging their control paths. This combining reduces the total number of scan lines required while maintaining reliable driving through the complementary second common line that provides independent voltage control for each pixel unit.
Solution Approach 2:
The first common line serves multiple pixel units within a pixel set, providing universal control functionality. This multi-functionality reduces the number of dedicated lines required, thereby reducing gate driving apparatus cost while maintaining display reliability through the universal line architecture.
3Reliability
If multiple common electrode lines are used to manage voltage levels, then voltage coupling effects are reduced, but the device complexity increases
Solution Approach 1:
Each pixel unit within a pixel set is provided with its own second common line, enabling localized voltage control. This local quality approach ensures that voltage levels can be independently managed for each pixel unit, preventing voltage coupling effects and ensuring brightness uniformity without requiring excessive numbers of common lines across the entire display.
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
The solution effectively reduces the number of driving apparatuses and costs while enhancing display quality by using two common electrode lines to manage voltage levels, minimizing voltage coupling effects and improving brightness uniformity across the display.
Implementation Method 1
a first storage capacitance is generated between the first common electrode line and the first pixel electrode. The second common electrode line is disposed under the second pixel electrode and electrically connected to an alternating current, and a second storage capacitance is generated between the second common electrode line and the second pixel electrode
Data Source
AI summary
A pixel array, a method for driving the same, and a display panel are provided. The pixel array includes a number of pixel sets, each of which includes a first scan line, a second scan line, a data line, a first active device electrically connected to the first scan line and the data line, a second active device electrically connected to the second scan line and the first active device, a first pixel electrode, a second pixel electrode, a first common electrode line, and a second common electrode line. The first pixel electrode and the second pixel electrode are electrically connected to the first active device and the second active device, respectively. The first common electrode line is disposed under the first pixel electrode and electrically connected to a direct current. The second common electrode line is disposed under the second pixel electrode and electrically connected to an alternating current.