Driving Voltage Control for OLED Color Stability and Power
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Solution Overview
Problem
Organic light-emitting display apparatuses face defects such as color shift and excessive power consumption due to inappropriate driving voltage levels, which current technologies fail to accurately adjust.
Innovation Solution
An apparatus and method that determine a suitable driving voltage for organic light-emitting display apparatuses by measuring color coordinate value changes, adjusting voltage levels, and considering degradation and dispersion margins to prevent abnormal colors and excessive power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the driving voltage level is increased to prevent color shift defects, then color stability is improved, but power consumption excessively increases
Solution Approach 1:
The patent changes the driving voltage parameter dynamically based on measured color coordinate values. By measuring actual color output and comparing it to target values, the system adjusts voltage levels to achieve optimal color stability while avoiding excessive voltage that would cause high power consumption. This parameter optimization resolves the contradiction between color stability and power consumption.
Solution Approach 2:
The patent implements a feedback mechanism where color coordinate values are measured, compared to fiducial values, and used to adjust driving voltage levels. The color coordinate value comparator continuously monitors color output and provides feedback to the voltage level determiner, which adjusts the driving voltage accordingly. This closed-loop feedback system prevents both color shift defects and excessive power consumption by maintaining voltage at optimal levels.
2Use of energy by moving object
If the driving voltage level is decreased to reduce power consumption, then power efficiency is improved, but color shift defects occur
Solution Approach 1:
The patent optimizes the driving voltage parameter by measuring color coordinate values and adjusting voltage to the minimum level required to maintain acceptable color stability. This prevents unnecessary power consumption while avoiding color shift defects by ensuring voltage remains above the threshold for proper color rendering.
Solution Approach 2:
The feedback mechanism compares measured color coordinate values against fiducial values and adjusts driving voltage accordingly. When color stability is adequate, the system reduces voltage to minimize power consumption. When color shift is detected, the system increases voltage to correct the defect, thus dynamically balancing power efficiency and color stability.
3Device complexity
If a fixed driving voltage is applied to all pixels, then device complexity is reduced, but manufacturing precision varies due to dispersion
Solution Approach 1:
The patent applies local quality by determining driving voltage levels individually for different pixel groups or regions based on their specific color coordinate measurements. Instead of a single fixed voltage for the entire display, the system adjusts voltage locally to compensate for manufacturing variations and dispersion, thereby improving color uniformity across the display while maintaining relatively simple overall device architecture.
Data Source
AI summary
An apparatus to determine a driving voltage includes: a color coordinate value comparator to measure a color coordinate value of an organic light-emitting display apparatus, to calculate a difference value between the measured color coordinate value and a fiducial color coordinate value, and to compare the calculated difference value with a first critical value; a voltage level changer to increase an absolute value of a driving voltage applied to each pixel of the organic light-emitting display apparatus when the difference value is greater than or equal to the first critical value; and a voltage level determiner to determine a level of the driving voltage at a point of time when the difference value is calculated as a final level of a driving voltage, when the difference value is less than the first critical value.