Display Data Driver Bias Switching for Repeated Row Patterns

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Solution Overview

Problem

Existing data drivers consume high power and accelerate deterioration of liquid crystal pixels due to constant voltage application, lacking efficient methods to adjust current based on display pattern changes.

Innovation Solution

A data driver with a comparator unit that compares sequential data to determine if adjacent rows have the same or different display patterns, adjusting the drive current accordingly, using a bias unit to set the current value to either a high or low value based on the comparison signal, thereby optimizing power usage and preventing screen deterioration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If constant voltage is applied to liquid crystal pixels, then reliable display operation is maintained, but power consumption increases and liquid crystal deterioration accelerates

Engineering Contradiction:

Improvedisplay operation reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies dynamics by making the drive current adjustable rather than constant. The data driver dynamically changes the current value based on whether adjacent row data is identical or different, transitioning between first current values (higher) and second current values (lower). This dynamic adjustment resolves the contradiction by maintaining reliability when needed (different data requires full drive current) while reducing power consumption when data repeats (same data allows reduced current).

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of drive current magnitude based on data pattern detection. When adjacent rows have different data, the driver uses first current values to ensure proper display operation. When adjacent rows have identical data, the driver switches to second current values (lower magnitude) to reduce power consumption. This parameter change strategy resolves the contradiction between maintaining display reliability and reducing power usage.

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If constant voltage is applied to liquid crystal pixels, then stable display performance is maintained, but liquid crystal deterioration accelerates

Engineering Contradiction:

Improvedisplay performance stabilityVSAvoidliquid crystal deterioration

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent implements dynamic current adjustment to prevent liquid crystal deterioration while maintaining display stability. The system detects whether adjacent row data is identical and adjusts the drive current accordingly - using lower second current values when data repeats (reducing deterioration) and higher first current values when data changes (maintaining stability). This dynamic approach resolves the contradiction between display stability and preventing deterioration.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent employs feedback by detecting the relationship between adjacent row data and using this information to control the drive current magnitude. The data driver continuously monitors data patterns and adjusts current levels in response, creating a feedback loop that prevents deterioration by reducing current when data is stable (identical adjacent rows) while maintaining performance when data changes. This feedback mechanism resolves the contradiction between stability and deterioration prevention.

Inventive Principle:

Principle #23Feedback

3Reliability

If drive current is increased to ensure proper pixel charging, then display quality is maintained, but power consumption increases

Engineering Contradiction:

Improvedisplay qualityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent changes the drive current parameter based on data pattern detection to resolve the energy-quality contradiction. When adjacent rows have different data requiring full pixel charging, the system uses higher first current values to maintain display quality. When adjacent rows are identical, the system reduces current to lower second current values, cutting power consumption while maintaining acceptable display quality. This parameter adaptation resolves the contradiction between energy efficiency and display quality.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10446107B2Data driver and display apparatus including the same

Publication Date: 2019.10.15 DB GLOBALCHIP CO LTD

AI summary

A data driver includes a latch unit configured to store sequential first data and second data, a comparator configured to receive the first data and the second data from the latch unit and to output a comparison signal by comparing the received first data with the received second data, a digital-analog converter configured to output an analog signal corresponding to the first data from the latch unit, an output unit configured to provide a drive current having a current value, the drive current configured to drive a display panel based on a bias signal and the analog signal, and a bias unit configured to adjust, set or maintain the bias signal based on the comparison signal. The current value is based on the bias signal.