Power Supply Voltage Regulation for OLED Luminance Consistency

Solution Overview

Problem

Organic light emitting display apparatuses experience luminance variation due to voltage drops in power supply lines, leading to inconsistent brightness across pixels, which affects image quality.

Innovation Solution

A power supply device with a feedback controller and voltage controller that detects voltage level changes in the power supply voltage and adjusts it to maintain consistent voltage levels across pixels, reducing luminance variation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If power supply voltage is applied to pixels through power lines, then pixels can emit light, but voltage drops occur in the power lines causing luminance variation

Engineering Contradiction:

Improveluminance consistencyVSAvoidvoltage stability

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent implements a feedback mechanism where the voltage level at a reference node is continuously monitored and fed back to a voltage generator. The voltage generator adjusts the power supply voltage based on the detected voltage level to compensate for voltage drops in the power lines, thereby maintaining consistent luminance across pixels.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent dynamically changes the power supply voltage parameter based on detected voltage levels. When voltage drops are detected in the power lines, the system adjusts the power supply voltage to compensate, ensuring stable operation of pixels despite variations in power line resistance or current load.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If different voltage levels are applied to pixels due to voltage drops, then power delivery is simplified, but luminance variation occurs

Engineering Contradiction:

Improvepower supply controlVSAvoidbrightness consistency

Core Design Contradiction:

Device complexityVSIllumination intensity

Solution Approach 1:

The patent implements a feedback mechanism where the voltage level at a reference node is continuously monitored and fed back to a voltage generator. The voltage generator adjusts the power supply voltage based on the detected voltage level to compensate for voltage drops in the power lines, thereby maintaining consistent luminance across pixels.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs self-adjustment by automatically detecting voltage drops and correcting them through feedback-controlled voltage regulation, eliminating the need for complex external control mechanisms while maintaining luminance consistency.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS9589510B2Power supply device and organic light emitting display apparatus including the same

Publication Date: 2017.03.07 SAMSUNG DISPLAY CO LTD

AI summary

A power supply device includes: a feedback controller configured to detect a feedback voltage based on an output voltage of a power output line connected to a power input line to which a power supply voltage is supplied; a voltage controller configured to detect a level change of the power supply voltage based on the feedback voltage; and a voltage generator configured to adjust the power supply voltage according to the detected level change.