Display Device Signal Supply Sequence Control

Solution Overview

Problem

Active matrix display devices face challenges in reducing power consumption due to high frequency changes in potential on signal lines, leading to increased power consumption during video signal supply.

Innovation Solution

A method is introduced to control the sequence of video signal supply to pixels in an active matrix display device, where the potentials of video signals are arranged in ascending or descending order to minimize the total absolute values of potential changes, reducing the frequency of charge and discharge on signal lines.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If video signals are supplied to pixels in conventional sequence, then all pixels can be updated, but the frequency of potential changes on signal lines increases leading to high power consumption

Engineering Contradiction:

Improvepower consumptionVSAvoidsignal line charging frequency

Core Design Contradiction:

Use of energy by moving objectVSProductivity

Solution Approach 1:

The patent applies preliminary action by pre-sorting video signals in ascending or descending order of potential before supplying them to pixels. This preliminary arrangement of signals minimizes potential changes on signal lines during the writing process, thereby reducing the frequency of charging and discharging operations and lowering power consumption.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the parameter of signal supply sequence from conventional order to sorted order based on potential values. By changing how video signals are ordered and supplied to pixels, the patent reduces the total absolute value of potential changes on signal lines, which directly reduces power consumption during signal line charging and discharging.

Inventive Principle:

Principle #35Parameter changes

2Use of energy by moving object

If video signals are supplied in sorted potential order, then power consumption is reduced, but the control complexity of signal supply sequence increases

Engineering Contradiction:

Improvepower consumptionVSAvoidsignal supply control sequence

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent employs feedback by using potential value information of video signals to determine the supply sequence. The system monitors or knows the potential values of video signals and uses this information to sort and arrange the signals in ascending or descending order before supply, creating a feedback-based control mechanism that optimizes power consumption.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent applies preliminary action by pre-sorting video signals in ascending or descending order of potential before supplying them to pixels. This preliminary arrangement of signals minimizes potential changes on signal lines during the writing process, thereby reducing the frequency of charging and discharging operations and lowering power consumption.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10062319B2Display device

Publication Date: 2018.08.28 SEMICON ENERGY LAB CO LTD

AI summary

To reduce power consumption of a display device. A sequence of supply of video signals to a plurality of pixels included in an active matrix display device is controlled. For example, a supply sequence is controlled so that the potentials of the video signals supplied to a plurality of pixels are in ascending order or in descending order. This enables a reduction in the amount of charge and discharge of electric charge of signal lines which supply video signals to a plurality of pixels. Consequently, power consumption of the display device can be reduced.