MSHD Display Panel Polarity Dot Inversion for RGBW Flicker

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Solution Overview

Problem

Conventional LCDs with RGBW color filters suffer from frame flicker and horizontal crosstalk, leading to poor image quality due to inadequate driving polarities and inefficient space utilization.

Innovation Solution

Implementing a Multi-Switch Half source Driving (MSHD) display panel with a source driver that uses a polarity-dot-inversion form to drive pixels, featuring a RGBW color filter with square regions at the corners, improving pixel driving and reducing flicker and crosstalk.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional driving polarities (frame inversion, column inversion, row inversion, or dot inversion) are used with RGBW color filter, then the LCD can be driven, but frame flicker and horizontal crosstalk occur leading to poor image quality

Engineering Contradiction:
Improveimage qualityVSAvoidframe flicker and horizontal crosstalk
Core Design Contradiction:
ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The invention segments the pixel driving into four distinct groups (R1, G1, B1, W1) that are driven sequentially rather than simultaneously. Each group is activated in a specific sequence during the frame period, allowing independent control of polarity for each color sub-pixel group. This segmentation eliminates the interference between different color channels that causes frame flicker and horizontal crosstalk.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The invention implements periodic action by cycling through the four color groups (R1, G1, B1, W1) in a repeating sequence within each frame period. Each group is activated for a specific time interval and then deactivated, with the next group following in sequence. This periodic activation pattern ensures proper polarity management while eliminating the continuous interference that causes display artifacts.

Inventive Principle:
Principle #19Periodic action

2Illumination intensity

If RGBW color filter is added to increase overall luminance, then brightness is improved, but space utilization becomes inefficient due to poor arrangement

Engineering Contradiction:
Improveoverall luminanceVSAvoidspace utilization
Core Design Contradiction:
Illumination intensityVSArea of stationary object

Solution Approach 1:

The invention uses asymmetric arrangement where white sub-pixels (W) are positioned at the corners of pixel regions while red, green, and blue sub-pixels are arranged along the edges. This asymmetric configuration optimizes the optical path and light extraction efficiency, allowing the white sub-pixels to effectively contribute to overall luminance without wasting display area. The corner positioning of white sub-pixels maximizes their utility while maintaining compact pixel structure.

Inventive Principle:
Principle #4Asymmetry

Solution Approach 2:

The invention transitions from traditional planar RGB arrangement to a three-dimensional spatial configuration where white sub-pixels are placed at corner positions in the pixel matrix. This dimensional change in sub-pixel arrangement allows for more efficient packing of the four-color (RGBW) elements within the same pixel area, improving space utilization while maintaining enhanced luminance output.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS7746335B2Multi-switch half source driving display device and method for liquid crystal display panel using RGBW color filter
Publication Date: 2010.06.29 AU OPTRONICS CORP
  • US7746335B2 patent drawing
  • US7746335B2 patent drawing
  • US7746335B2 patent drawing

AI summary

A display device for a liquid crystal display (LCD) panel using a RGBW color filter and a display method thereof are provided. The display device includes a source driver and a MSHD(Multi-Switch Half source Driving) display panel. The display method includes arranging the RGB color filter onto the MSHD display panel; using the source driver to drive a plurality of pixels of the MSHD display panel in a polarity-dot-inversion form; and displaying a frame formed of the plurality of pixels of the MSHD display panel which are in polarity-dot-inversion form via the light passing through the RGBW color filter.