LCD Pixel Structure with Segmented Electrodes for Low Color Washout
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Solution Overview
Problem
Current LCD panels with low color washout require increasing scan lines, leading to higher costs due to the need for twice the number of chip-on-films (COF), which is undesirable.
Innovation Solution
A pixel structure comprising a matrix of pixel cells defined by intersecting scan lines and data lines, with each pixel cell including first and second discharge control switches, main and sub-pixel areas, and thin film transistors, allowing for discharge of sub-pixel electrodes without increasing scan lines, enabling low color washout design while being compatible with forward and reverse scan modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If scan lines are increased to control different regions of a same pixel, then color washout is reduced, but the number of chip on films (COF) must be doubled resulting in increased costs
Solution Approach 1:
The pixel electrode is divided into a main pixel electrode and a sub-pixel electrode, allowing independent control of different regions within the same pixel. This segmentation enables different voltage control for the main and sub pixels, reducing color washout effects while maintaining a single COF structure.
Solution Approach 2:
Different regions of the pixel (main pixel and sub-pixel) are given different electrical properties through separate electrode structures and control switches. The sub-pixel electrode is specifically designed with different capacitance characteristics, allowing localized optimization of display performance without increasing overall system complexity.
2Object-affected harmful factors
If discharge control switches are added to enable sub-pixel discharge, then low color washout is achieved, but device complexity increases
Solution Approach 1:
The discharge control functionality is merged into the existing scan line structure. The first and second discharge control switches are integrated with the scan lines that already exist for pixel selection, allowing discharge control to be achieved without adding entirely new control pathways or increasing the overall number of scan lines required.
Solution Approach 2:
The scan lines serve multiple functions: they control the main pixel electrode, enable discharge of the sub-pixel electrode through the discharge control switches, and maintain backward compatibility with forward and reverse scan modes. This multi-functionality reduces the need for additional dedicated discharge control线路.
3Adaptability or versatility
If the pixel structure is designed to support both forward and reverse scan modes, then adaptability is improved, but device complexity increases
Solution Approach 1:
The pixel structure uses asymmetric electrode arrangements where the sub-pixel electrode is positioned adjacent to the main pixel electrode in a specific configuration. This asymmetric design, combined with the discharge control switch placement, enables the same structure to function correctly in both forward and reverse scan directions without requiring mode-specific redesign.
Solution Approach 2:
The discharge control mechanism is designed to work bidirectionally, where the first and second discharge control switches can be activated regardless of scan direction. The structure allows the discharge function to be inverted or reversed along with the scan direction, maintaining functionality whether scanning from top-to-bottom or bottom-to-top.
Data Source
AI summary
The present invention provides a pixel structure including a plurality of pixel cells arranged in a matrix. The pixel cells are defined by a plurality of scan lines and data lines that being mutually intersected. Each pixel cell includes a first discharge control switch, a second discharge control switch, a main pixel area and a sub-pixel region is disposed adjacent the latter. The main pixel area includes a main pixel electrode and a main charge control switch. The sub-pixel area includes a sub-pixel electrode and a sub-charge control switch. The main pixel electrode receives display signals by the main charge control switch. The sub-pixel electrode receives display signals by the sub-charge control switch. The scan line transmitting scan signals of its present pixel cell and the sub-pixel electrode of the above pixel cell are connected by said first discharge control switch.