Pixel Circuit Sub-Pixel Switching for LCD Color Washout

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Solution Overview

Problem

Liquid Crystal Display (LCD) devices suffer from the color washout phenomenon, where image colors distort and become whiter when viewed from large angles, particularly affecting medium and low gray-level luminance, necessitating improved wide viewing angle technology.

Innovation Solution

A pixel circuit design featuring a first and second sub-pixel, each connected through specific pixel switches to scan and data lines, allowing differential data transmission and gray-level luminance control to mitigate color washout by utilizing a unique switching mechanism that enables precise charging of sub-pixels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a conventional pixel circuit structure is used, then the device is simple in structure, but color washout occurs when viewing from large angles

Engineering Contradiction:

Improvecolor washoutVSAvoidpixel circuit structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The pixel is divided into multiple sub-pixels (first sub-pixel and second sub-pixel) with different switching mechanisms. Each sub-pixel has its own pixel switch controlled by different scan lines, allowing independent control of luminance for each sub-pixel to compensate for color washout effects.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different sub-pixels are assigned different luminance characteristics through local switching control. The first sub-pixel and second sub-pixel have different gray-level luminance by controlling their respective pixel switches with different scan line signals, creating local quality differences to counteract viewing angle distortion.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If redundant luminance is reduced to improve color washout, then color distortion improves, but image brightness may be affected

Engineering Contradiction:

Improvecolor distortionVSAvoidimage brightness

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The invention changes the luminance parameters of different sub-pixels by controlling their switching timing and voltage levels. By adjusting the gray-level luminance of each sub-pixel independently through parameter control (scan line timing and voltage), the system reduces color washout while maintaining overall image brightness.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8243108B2Pixel circuit and driving method thereof

Publication Date: 2012.08.14 AU OPTRONICS CORP

AI summary

Pixel circuit includes first and second scan lines, data line, three switches, and pixel. Three switches all include first end, second end, and control end. Pixel includes first and second sub-pixels. First end of first switch is coupled to data line. Control end of first switch is coupled to first scan line. First end of second switch is coupled to second end of first switch. Control end of second switch is coupled to second scan line. First end of third switch is coupled to data line. Control end of third switch is coupled to first scan line. First sub-pixel is coupled to second end of second switch for coupling to second end of third switch through second and first switches. Second sub-pixel is coupled to second end of third switch for coupling to data line through third switch.