RGBW Pixel Arrangement for Display Panel Voltage Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Color liquid crystal display screens experience flicker, color cast, and cross-talk due to voltage fluctuations in the common electrode when pure-color images are displayed, especially with the traditional three-sub-pixel structure, leading to poor display effects.
Innovation Solution
A pixel arrangement with four sub-pixels (red, green, blue, and white) is designed, where sub-pixels in the same row share a scanning line and those in the same column share a data line, with data signal polarities arranged in a repetition group to ensure that sub-pixels of the same color have opposite polarities, allowing for simultaneous lighting of red, green, and blue sub-pixels with both positive and negative polarities, thereby stabilizing the common electrode voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a traditional three-sub-pixel structure (R, G, B) is used, then the penetration rate is limited, but adding a white sub-pixel (making it four sub-pixels) improves the penetration rate while causing voltage fluctuations in the common electrode that lead to flicker, color cast, and cross-talk
Solution Approach 1:
The pixel is segmented into four sub-pixels (R, G, B, W) instead of three, allowing the white sub-pixel to provide additional brightness and improve penetration rate while the other three sub-pixels maintain color accuracy. This segmentation enables simultaneous use of white light for brightness enhancement and colored sub-pixels for color fidelity.
Solution Approach 2:
The patent changes the polarity parameter of data signals applied to sub-pixels. By alternating polarities in a specific pattern (e.g., R: +, G: -, B: -, W: +), the system balances the voltage on the common electrode, preventing voltage drift that causes flicker and color cast while maintaining the benefits of the four-sub-pixel structure.
2Illumination intensity
If all sub-pixels of the same color have the same polarity when lit up, then the color display is pure, but the common electrode voltage is easily pulled up or down causing flicker and cross-talk
Solution Approach 1:
The patent applies counterbalancing polarities to different sub-pixels. When red sub-pixel is lit with positive polarity, other sub-pixels may be lit with negative polarity to counterbalance the voltage effect on the common electrode. This anti-weight approach prevents voltage drift while maintaining color purity through selective sub-pixel activation.
Solution Approach 2:
The system employs periodic polarity reversal in the data signals. By systematically alternating the polarity of drive signals in a repeating pattern across different sub-pixels and time periods, the common electrode voltage is kept balanced over time, preventing cumulative voltage drift that causes flicker and cross-talk while maintaining pure color display.
3Ease of manufacture
If sequential arrangement of R, G, B, W sub-pixels is used in each row, then the structure is simple and manufacturing is easy, but the same polarity pattern repeats causing display artifacts
Solution Approach 1:
While maintaining the simple sequential arrangement R-G-B-W for ease of manufacture, the patent introduces asymmetry in the polarity assignment pattern. Instead of repeating the same polarity sequence, different polarity patterns are applied to different rows or groups of pixels, breaking the symmetry that causes display artifacts while keeping the physical layout simple and manufacturable.
Data Source
AI summary
This application provides a pixel arrangement and a display panel. The pixel arrangement includes a plurality of pixel cells arranged in an array, each pixel cell includes four sub-pixels that are respectively red, green, blue, and white. Sub-pixels in a same row are connected to a same scanning line, and sub-pixels in a same column are connected to a same data line. In the pixel arrangement, sub-pixels connected to eight sequential data lines are arranged as a repetition group, and a data signal on an Nth data line is the same as a data signal on an (N+1)th data line. In one repetition group, polarities of data signals of sub-pixels with a same color that are connected to a same scanning line are opposite.