Pixel Driving Structure for LCD Aperture Alignment
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Solution Overview
Problem
Traditional liquid crystal display panels using column inversion mode suffer from display defects such as bright and dark lines and irregular spots due to misalignment of pixel aperture regions, leading to reduced display quality and increased power consumption.
Innovation Solution
A pixel driving structure where sub pixels are sequentially and repeatedly aligned in an order of red, green, and blue, with TFTs arranged close to data lines, and data lines set to define polarities in pixel groups to achieve polarity inversion, eliminating the need for wiring detouring and reducing resistive and capacitive loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If wiring detouring design is used to align TFTs and aperture regions, then alignment of aperture regions is improved, but data line length increases tremendously
Solution Approach 1:
The invention segments the pixel array into multiple columns, with each column having TFTs and aperture regions that are independently aligned. This allows the aperture regions to be neatly aligned without requiring detouring of data lines, as each column can be independently configured. The segmentation resolves the contradiction by eliminating the need for complex wiring patterns while maintaining alignment precision.
2Manufacturing precision
If data line length is increased to align aperture regions, then alignment of aperture regions is improved, but resistive loading increases tremendously
Solution Approach 1:
By segmenting the display into columns with independently aligned TFTs and aperture regions, the invention eliminates the need for extended data line paths. Each column can be directly connected to its corresponding data line without detours, thereby maintaining short data line lengths and minimizing resistive loading while achieving proper alignment.
Solution Approach 2:
The invention introduces an intermediary structure where TFTs are positioned to serve as direct connection points between data lines and pixel circuits. This intermediary arrangement allows for direct routing without requiring data lines to extend or detour, thus reducing resistive loading while maintaining alignment.
3Manufacturing precision
If data line length is increased to align aperture regions, then alignment of aperture regions is improved, but capacitive loading increases
Solution Approach 1:
The column-based segmentation allows each column's TFTs to be directly connected to corresponding data line segments, eliminating the need for long continuous data line paths. This reduces the total capacitive loading on data lines while maintaining proper alignment of aperture regions across the display.
4Reliability
If column inversion mode is used to prevent liquid crystal polarization, then alternating current driving is achieved, but misalignment of aperture regions occurs
Solution Approach 1:
The invention segments the pixel array into columns where TFTs and aperture regions are independently aligned within each column. This segmentation allows the column inversion mode to function for preventing liquid crystal polarization while the independent column configuration ensures proper alignment of aperture regions, resolving the contradiction between these two requirements.
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 arrangement neatly aligns pixel aperture regions, prevents display defects, reduces power consumption, and enhances display quality by achieving a display effect similar to dot inversion without increasing the length or capacitive loading of data lines.
Implementation Method 1
the liquid crystal molecules will be polarized if the voltage of the same direction is applied to the liquid crystal molecules with a long period of time
Implementation Method 2
The light of backlight module is refracted to generate images by applying driving voltages to the two substrates for controlling the rotations of the liquid crystal molecules
Implementation Method 3
The light of backlight module is refracted to generate images by applying driving voltages to the two substrates for controlling the rotations of the liquid crystal molecules
Data Source
AI summary
Provided are a pixel driving structure, in which the nth column of TFTs (T) are arranged at positions where the nth column of sub pixels (P) is close to the nth data line (D(n)); in the nth column of sub pixels (P), four sub pixels (P) or two sub pixels (P), which are adjacent vertically in the upper and the lower are set to be a pixel group (PG), and the nth data line (D(n)) sets a signal period to define polarities of respective sub pixels (P) in the pixel group (PG) to make polarity inversion occur at a edge of the two adjacent pixel groups (PG) in the upper and the lower, and polarities of two adjacent columns of sub pixels (P) are opposite to achieve display effect similar to a dot inversion. The pixel aperture regions can be neatly aligned to prevent the color washout.