White Pixel TFT Structure for LCD Brightness
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Solution Overview
Problem
The brightness of single color images is significantly decreased in LCD devices due to the reduction in the number of red, green, and blue pixel units caused by the inclusion of white pixel units within a given pixel structure.
Innovation Solution
A pixel structure is designed with white pixel units featuring both a first and second thin film transistor, where the second transistor is electrically connected to an adjacent pixel unit, allowing for a larger pixel electrode and improved light transmittance by positioning the second transistor within the white pixel unit, thereby increasing the size of the pixel electrode opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If white pixel units are included in the pixel structure to improve light transmittance, then overall light transmittance is improved, but the number of red, green, and blue pixel units is reduced, causing significant decrease in brightness of single color images
Solution Approach 1:
The white pixel unit is designed to perform multiple functions: it serves as a white pixel for color images while simultaneously acting as a shared control unit for adjacent color pixel units through the second thin film transistor. This multi-functionality allows the same physical structure to benefit both white pixel display and color pixel control, resolving the contradiction between including white pixels and maintaining sufficient color pixels.
Solution Approach 2:
The patent merges the control functionality for adjacent color pixel units into the white pixel unit by placing a second thin film transistor within it. This transistor controls pixel electrodes of adjacent color units (e.g., red and blue pixels), effectively combining multiple control functions into a single structural unit, thereby increasing the effective area for color pixel control without adding separate transistor structures.
2Device complexity
If the second thin film transistor is positioned in the adjacent pixel unit, then the pixel structure is simpler, but the pixel electrode area is reduced, decreasing light transmittance and brightness
Solution Approach 1:
The patent transitions from a traditional one-to-one mapping between transistors and pixel units to a many-to-one relationship where one transistor (the second TFT in the white pixel unit) controls pixel electrodes in adjacent color units. This dimensional change in the control relationship allows the pixel electrode area to be enlarged without proportionally increasing transistor count, thereby improving brightness while managing complexity.
3Illumination intensity
If the pixel electrode size is increased to improve brightness, then light transmittance is improved, but the area available for other pixel components is reduced
Solution Approach 1:
The patent segments the control functions into two separate transistors within the white pixel unit: the first thin film transistor controls the white pixel electrode, while the second thin film transistor controls adjacent color pixel electrodes. This segmentation allows the pixel electrode area to be maximized for brightness while the transistor structures are efficiently arranged in the same white pixel unit, preventing conflict between electrode area and component space.
Data Source
AI summary
The present disclosure provides a pixel structure, a manufacturing method of a pixel structure, an array substrate, a display panel, and a display device. The pixel structure includes a plurality of data lines, a plurality of scan lines, a plurality of pixel units and a pixel electrode in each pixel unit including a plurality of slits. An end of the slit includes at least one corner. The white pixel unit includes a first TFT and a second TFT. In a row of pixel units, a first TFT of each white pixel unit is electrically connected to a pixel electrode of the white pixel unit, and a second TFT of each white pixel unit is electrically connected to a pixel electrode of a pixel unit adjacent to the white pixel unit. The corner of the slit in the pixel electrode electrically connected with the second TFT extends toward the second TFT.