Pixel Driving Circuit Dot Inversion Source IC Power

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Solution Overview

Problem

Conventional half source driving (HSD) pixel layout designs require polarity conversion of the source voltage signal per frame, leading to increased power consumption and temperature of source ICs, which deteriorates reliability.

Innovation Solution

A pixel driving circuit with a dot inversion arrangement of sub-pixels, where two scan lines and two data lines are used for each column and row, respectively, with alternating polarities, eliminating the need for polarity switching within a frame, reducing power consumption and IC temperature.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If conventional HSD pixel layout design is used, then the number of source ICs can be reduced, but polarity conversion per frame is required causing increased power consumption and temperature

Engineering Contradiction:

Improvenumber of source ICsVSAvoidpower consumption of source IC

Core Design Contradiction:

Device complexityVSUse of energy by stationary object

Solution Approach 1:

The pixel array is divided into multiple pixel units, each containing four sub-pixels with different colors arranged in dot inversion pattern. This segmentation allows independent polarity management for each pixel unit, eliminating the need for frame-level polarity conversion while maintaining reduced source IC count

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of converting polarity at frame level as in conventional HSD design, the patent inverts the approach by using dot inversion arrangement at pixel unit level with alternating positive and negative polarities. This reversal of the inversion scale eliminates the need for active polarity conversion, reducing power consumption while maintaining the half source driving architecture

Inventive Principle:

Principle #13The other way round (Inversion)

2Device complexity

If conventional HSD pixel layout design is used, then the number of source ICs can be reduced, but temperature of source IC rises deteriorating reliability

Engineering Contradiction:

Improvenumber of source ICsVSAvoidreliability quality

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The display panel is divided into multiple pixel units with dot inversion arrangement, where each pixel unit contains four sub-pixels with alternating polarities. This segmentation distributes the electrical stress and heat generation across multiple small units rather than requiring large-scale polarity conversion, reducing thermal accumulation in source ICs while maintaining architectural simplicity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies dot inversion at the pixel unit level with alternating polarities instead of frame-level polarity conversion. This inverted approach eliminates the need for repeated polarity switching operations that generate heat, thereby reducing source IC temperature and improving reliability while maintaining the reduced source IC count

Inventive Principle:

Principle #13The other way round (Inversion)

3Use of energy by stationary object

If dot inversion arrangement with alternating polarities is used, then polarity switching is eliminated reducing power consumption, but more scan lines and data lines are required

Engineering Contradiction:

Improvepower consumptionVSAvoidnumber of scan lines and data lines

Core Design Contradiction:

Use of energy by stationary objectVSDevice complexity

Solution Approach 1:

The patent combines two scan lines to drive one column of pixel units and uses two data lines per row, merging the functionality of multiple lines into a coordinated system. This combining approach manages the increased line count efficiently while enabling dot inversion arrangement that eliminates polarity switching and reduces power consumption

Inventive Principle:

Principle #5Merging (Combining)

4Reliability

If dot inversion arrangement with alternating polarities is used, then polarity switching is eliminated improving reliability, but more scan lines and data lines are required

Engineering Contradiction:

Improvereliability qualityVSAvoidnumber of scan lines and data lines

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges two scan lines to drive one column and uses two data lines per row, creating a coordinated line system that manages the increased complexity. This merging strategy enables dot inversion arrangement with alternating polarities that eliminates polarity switching, thereby improving reliability while controlling the impact of increased line count

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS10971105B2Pixel driving circuit, driving method and display device

Publication Date: 2021.04.06 HKC CORP LTD

AI summary

A pixel driving circuit comprises a pixel array, data lines and scan lines. The pixel array includes a plurality of pixel units having four sub-pixels with different colors. All of the sub-pixels are arranged in a dot inversion arrangement, and positive and negative polarities of the sub-pixels are alternately arranged. The data lines and the scan lines are orthogonally disposed to define a pixel array. Two of the scan lines are provided for each column of pixel units, and two of the data lines are provided for each row of pixel units. Each data line is connected to two closest sub-pixels with the same polarity when passing through one column of pixel units, and all the sub-pixels connected to the same data line in the row direction have the same polarity. The sub-pixels connected to the adjacent data lines have reverse polarities.