Display Panel Shared Data-Line Pixel Polarity for Uniform Brightness
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Solution Overview
Problem
In dual-gate pixel architectures of liquid crystal displays, odd-column and even-column pixels connected to the same data line receive data signals with opposite polarities, leading to uneven brightness and vertical bright and dark lines due to parasitic capacitance, which affects the display quality.
Innovation Solution
Adjust the charging durations and polarities of adjacent sub-pixels connected to the same data line, and adjust the common voltage to ensure uniform brightness by optimizing the charging times and voltage differences between sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If dual-gate pixel architecture is adopted to reduce data lines, then device complexity is reduced, but brightness uniformity deteriorates due to parasitic capacitance causing vertical bright and dark lines
Solution Approach 1:
The patent applies preliminary action by adjusting the common voltage before data signal transmission to compensate for parasitic capacitance effects. The common voltage is pre-adjusted based on the polarity of incoming data signals, ensuring that even-column pixels receive adequate charging voltage before the data signal arrives, thereby preventing brightness deficiency before the problem occurs
Solution Approach 2:
The patent changes the common voltage parameter dynamically based on data signal polarity. When odd-column pixels receive positive polarity signals, the common voltage is adjusted to a first value, and when even-column pixels receive negative polarity signals, the common voltage is adjusted to a second value. This parameter change compensates for parasitic capacitance effects and ensures uniform brightness across all pixels
2Ease of manufacture
If opposite polarity data signals are applied to odd and even column pixels, then charging balance is disrupted due to parasitic capacitance, but this architecture enables cost reduction
Solution Approach 1:
The patent implements feedback by continuously monitoring the polarity of incoming data signals and adjusting the common voltage accordingly. The voltage adjustment module receives feedback about which column (odd or even) is currently being driven and modifies the common voltage to compensate for parasitic capacitance, ensuring precise charging despite the dual-gate architecture's inherent polarity alternation
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
The solution effectively balances the brightness of adjacent sub-pixels, eliminating vertical bright and dark lines on the screen and ensuring uniform display quality.
Implementation Method 1
by applying voltage to both ends of a liquid crystal molecule, the liquid crystal molecule is driven to rotate, thereby allowing the liquid crystal molecule to adjust the brightness of the light emitted by the pixel
Implementation Method 2
Due to the parasitic capacitance on the data line, the even-column pixels are not fully charged, resulting in low brightness of the even-column pixels
Data Source
AI summary
A display panel and a display apparatus are provided. The display panel includes multiple data lines, multiple scan lines, and multiple sub-pixels. The multiple sub-pixels include a first sub-pixel and a second sub-pixel, and the first sub-pixel and the second sub-pixel are adjacent to each other in a same row and are connected to a same data line. During display of one frame of image, the first sub-pixel receives a first data signal, and the second sub-pixel receives a second data signal. The polarity of the first data signal is opposite to the polarity of the second data signal. A display grayscale of the first sub-pixel after adjustment is less than or equal to a grayscale corresponding to the first data signal, and a difference between a display grayscale of the second sub-pixel after adjustment and a grayscale corresponding to the second data signal falls within a preset range.