Display Driver Data Converter Minimizes Signal Transitions

Solution Overview

Problem

In display devices like LCDs and OLEDs, frequent data transitions between the signal controller and memory lead to increased power consumption and Electromagnetic Interference (EMI).

Innovation Solution

A driving apparatus and method that includes a signal controller with a data converter using exclusive OR gates to minimize data transitions by converting and outputting all bits except the most significant bit to the memory, and restoring all bits except the most significant bit from the memory, thereby reducing EMI.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If data is transferred frequently between signal controller and memory, then image processing capability is improved, but power consumption increases

Engineering Contradiction:

Improveimage processing capabilityVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent applies preliminary action by pre-converting image data bits before memory storage. The data converter converts all bits except the most significant bit (MSB) in advance, so that when data is read from memory, fewer bit transitions occur during subsequent operations, thereby reducing power consumption while maintaining image processing capability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the parameter representation of image data by selectively converting bits. Specifically, all bits except the MSB are converted through XOR operations before storage, and this bit pattern transformation is maintained during memory access, reducing the frequency of high-swapping data transitions and thus lowering power consumption

Inventive Principle:

Principle #35Parameter changes

2Speed

If data transitions occur frequently between signal controller and memory, then data processing speed is improved, but EMI increases

Engineering Contradiction:

Improvedata processing speedVSAvoidEMI

Core Design Contradiction:

SpeedVSObject-generated harmful factors

Solution Approach 1:

The patent applies preliminary action by pre-converting image data bits before memory storage. The data converter converts all bits except the most significant bit (MSB) in advance, so that when data is read from memory, fewer bit transitions occur during subsequent operations, thereby reducing power consumption while maintaining image processing capability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the parameter representation of image data by selectively converting bits. Specifically, all bits except the MSB are converted through XOR operations before storage, and this bit pattern transformation is maintained during memory access, reducing the frequency of high-swapping data transitions and thus lowering power consumption

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8077166B2Driving apparatus and driving method for display device

Publication Date: 2011.12.13 SAMSUNG DISPLAY CO LTD

AI summary

A driver and a driving method of a display device that includes a signal controller that processes image data input from an external circuit and a memory that is connected to the signal controller, wherein the signal controller includes a data converter that converts the image data and outputs the converted image data to the memory, and the data converter includes a data output unit that converts and outputs the image data and a data input unit that restores the image data input from the memory. Accordingly, the number of data transitions between the signal controller and the memory can be minimized to reduce current consumption and to reduce EMI.