LCD Panel Dual Common Voltage Bus Structure
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Solution Overview
Problem
The existing LCD panel designs suffer from image sticking, crosstalk, and flicker problems, particularly in low temperature polysilicon (LTPS) based panels, due to the frame inversion or column inversion modes used to reduce IC driving power consumption.
Innovation Solution
The implementation of a structure with two common voltage buses, one transmitting a higher voltage (Vcom1) and the other a lower voltage (Vcom2), both greater or smaller than the pixel voltage, and utilizing different sub-pixel routings to achieve inversion or dot inversion driving modes, which are switched between adjacent frames to mitigate these issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If frame inversion or column inversion mode is used to reduce IC driving power consumption, then energy consumption is reduced, but image sticking, crosstalk and flicker problems occur
Solution Approach 1:
The common voltage supply is segmented into two separate common voltage buses (first and second common voltage buses) with different voltage levels. This segmentation allows different columns of sub-pixels to be driven with different common voltages, enabling inversion driving modes that eliminate image sticking and crosstalk while maintaining low power consumption.
Solution Approach 2:
Different columns of sub-pixels are assigned different common voltages (Vcom1 or Vcom2) based on their column position. This local differentiation in voltage supply creates the necessary voltage polarity alternation for inversion driving, solving the display quality issues without requiring high overall power consumption.
2Device complexity
If all pixels share a constant common voltage Vcom, then device structure is simple, but image sticking and crosstalk occur in inversion driving modes
Solution Approach 1:
The single common voltage supply is divided into two separate common voltage buses carrying different voltage levels. This segmentation enables the system to provide different common voltages to different columns, which is essential for implementing inversion driving modes that prevent image sticking and crosstalk.
Solution Approach 2:
Instead of using a single constant common voltage for all pixels, the invention uses two different common voltages alternately applied to different columns. This inverted approach—where the common voltage varies by column rather than being uniform—enables inversion driving that eliminates display artifacts.
3Manufacturing precision
If low temperature polysilicon (LTPS) TFTs are used, then manufacturing precision is improved, but frame inversion or column inversion causes severe crosstalk
Solution Approach 1:
Different columns of LTPS TFT-based sub-pixels are supplied with different common voltages based on their column position. This local differentiation in voltage supply creates the necessary conditions for inversion driving, which eliminates crosstalk and other display quality issues while preserving the high performance benefits of LTPS TFTs.
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 approach effectively reduces image sticking, crosstalk, and flicker, thereby enhancing the display quality of the LCD panel.
Implementation Method 1
fill the LC molecules into between a thin film transistor (TFT) array substrate and a color filter (CF) substrate, and apply a driving voltage between the two substrates to control the rotation of the LC molecules to refract the light from the backlight module
Data Source
AI summary
The invention provides a structure for LCD panel, by disposing a first and a second common voltage buses (Com1, Com2) on the two sides of the active area (AA) of the LCD panel, and the first common voltage bus (Com1) carrying a first common voltage Vcoml different from a second common voltage Vcom2 carried on the second common voltage bus (Com2), in combination with different sub-pixel routings to achieve the inversion or dot inversion driving mode, solve the image sticking, crosstalk and flicker problems and improve display quality of the LCD panel.