Pixel Unit Charge Sharing Transistor Scan Line Common Voltage
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Solution Overview
Problem
The existing pozidriv pixel electrode structure in liquid crystal display panels leads to visual color differences and reduced transmittance, and the prior art's solution to improve this by dividing subpixels into main and sub regions requires an additional array substrate common voltage wire, reducing the aperture ratio and increasing the frame width of the panel.
Innovation Solution
A pixel unit with subpixels arranged in an array, using parallel horizontal and vertical scan lines and data lines, where the charge sharing thin film transistor's source is connected to the next row's scan line, eliminating the need for an additional array substrate common voltage wire, and maintaining different voltage levels between main and sub regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the charge sharing thin film transistor's source is connected to the array substrate common voltage wire, then the main region and sub region can produce different voltage levels to increase the view angle, but the aperture ratio of the liquid crystal display panel is reduced and the frame width is increased
Solution Approach 1:
The patent extracts the common voltage supply function from a dedicated array substrate common voltage wire and relocates it to utilize the scan line structure. By connecting the charge sharing thin film transistor's source to the scan line of the next row, the patent eliminates the need for an additional common voltage wire, thereby increasing the aperture ratio while maintaining the view angle enhancement capability through different voltage levels in main and sub regions
Solution Approach 2:
The scan line structure is given multiple functions: it not only scans the pixel units but also serves as the common voltage supply line for the charge sharing thin film transistor. This multi-functional use of the scan line eliminates the need for a separate common voltage wire, increasing the effective display area and aperture ratio while maintaining the ability to produce different voltage levels for view angle enhancement
2Adaptability or versatility
If the charge sharing thin film transistor's source is connected to the array substrate common voltage wire, then the main region and sub region can produce different voltage levels to increase the view angle, but the frame width of the liquid crystal display panel is increased
Solution Approach 1:
The patent extracts the common voltage supply function from a dedicated array substrate common voltage wire and relocates it to utilize the scan line structure. By connecting the charge sharing thin film transistor's source to the scan line of the next row, the patent eliminates the need for an additional common voltage wire, thereby increasing the aperture ratio while maintaining the view angle enhancement capability through different voltage levels in main and sub regions
Solution Approach 2:
The patent merges the common voltage supply function with the scan line function. The scan line serves dual purposes: scanning the pixel units and providing common voltage to the charge sharing thin film transistor. This consolidation eliminates the need for separate common voltage wiring, reducing the frame width and increasing the effective display area
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 configuration increases the aperture ratio and reduces the frame width of the liquid crystal display panel by minimizing the number of wires in the array substrate, allowing for a narrower frame and improved color accuracy.
Implementation Method 1
As the voltages are applied to the pixel electrodes and the common electrodes, the electrical field can be generated in the liquid crystal layer, and the electrical field determines the orientation of the liquid crystal molecules, and then to adjust the polarization of the light incident into the liquid crystal layer
Data Source
AI summary
The present invention provides a pixel unit and a driving method thereof. By electrically connecting the source of the charge sharing thin film transistor to the scan line corresponding to the next row of sub pixels of the sub pixel where the charge sharing thin film transistor is and setting the voltage level of the scan line corresponding to the next row of sub pixels to be the array substrate common voltage when the sub pixel is scanned, the main region and the sub region of the sub pixel have different voltage levels, and the additional arrangement of a line of the array substrate common voltage is not required. In comparison with prior art, the number of wires in the array substrate is reduced and the aperture ratio of the liquid crystal display panel is increased which facilitates the realization of the narrow frame of the liquid crystal display panel.