LCD Panel Dot Inversion Routing and Jumper Design
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Solution Overview
Problem
Conventional LCD panels using the dot inversion mode suffer from flicker and crosstalk issues due to the same voltage parity among data lines controlled by a fan-out line, especially in WRGB pixel structures, which affects display quality.
Innovation Solution
The LCD panel design adjusts the routing of gate and data lines, with specific connections and a jumper design in the demultiplexer to change the parity inversion mode, ensuring that adjacent fan-out lines have opposite voltage parities, achieving true dot inversion without altering source driving power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a demultiplexer is used to allocate a fan-out line to multiple data lines to reduce the number of source IC pins, then the device complexity is reduced, but the voltage parity of multiple data lines becomes the same, causing severe flicker and crosstalk
Solution Approach 1:
The patent inverts the conventional scanning sequence by scanning even-numbered gate lines first, then odd-numbered gate lines, instead of the conventional sequential scanning from line 1 to N. This inversion changes the voltage parity distribution pattern, allowing data lines controlled by the same fan-out line to have different parities when combined with the jumper design, thereby eliminating flicker and crosstalk while maintaining the demultiplexer structure
Solution Approach 2:
The patent introduces a jumper as an intermediary component at the end of the demultiplexer. This jumper redirects specific data lines (D2, D3, D6, D7) to different scan sequences, acting as a mediator that decouples the direct relationship between fan-out lines and data line parity, enabling true dot inversion mode while maintaining the reduced pin structure
2Ease of operation
If a jumper design is used to change the scan manner from column-by-column to odd-even sequence, then the parity inversion pattern changes, but true dot inversion is not achieved
Solution Approach 1:
The patent dynamically adjusts the scanning sequence based on line numbering, creating a conditional scanning pattern where even-numbered lines are scanned first, followed by odd-numbered lines. This dynamic approach, combined with the jumper's selective redirection, achieves true dot inversion where each pixel's voltage parity differs from all adjacent pixels, meeting the strict definition of dot inversion mode
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 solution effectively reduces flicker and crosstalk, improving the display quality of the LCD panel by ensuring proper parity inversion across the panel, even in WRGB pixel structures.
Implementation Method 1
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 an LCD panel of dot inversion mode; without changing source driving power-consumption, adjusting the routing inside LCD panel: for even numbers n, the adjacent (n−1)-th gate scan line (G(n−1)) and n-th gate scan line (G(n)) are disposed closely, with TFTs of (n−1)-th column located above (n−1)-th gate scan line (G(n−1)), and TFTs of n-th column located below n-th gate scan line (G(n)); the gates of part of the TFTs of (n−1)-th column and n-th column are connected to (n−1)-th gate scan line (G(n−1)), and the gates of part of TFTs of the (n−1)-th column and n-th column are connected to n-th gate scan line (G(n)); with a jumper design on the end of a de-multiplexer to change the parity inversion mode of LCD panel to achieve dot inversion. As such, the invention overcomes the flicker and crosstalk problems and improve LCD panel display quality.