OLED Display DAC Channel Deterioration Measurement
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Solution Overview
Problem
Organic light emitting display devices face issues with image brightness due to organic light emitting diode deterioration, leading to increased manufacturing costs and mounting area when using analog-to-digital converters (ADCs) at each channel, and prolonged measurement times when sharing ADCs across multiple channels.
Innovation Solution
An organic light emitting display device with a digital-to-analog converter (DAC) in each channel for generating data signals and measuring OLED deterioration, including a supply part, deterioration part, and switching unit to connect data lines during driving and sensing periods, allowing for efficient compensation of OLED degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ADCs are formed at each channel to measure OLED deterioration, then measurement precision is improved, but manufacturing cost and mounting area increase
Solution Approach 1:
The digital-to-analog converter (DAC) is designed to perform multiple functions: generating data signals during the driving period and measuring OLED deterioration during the sensing period. This multi-functionality eliminates the need for separate ADCs at each channel, thereby reducing manufacturing cost and mounting area while maintaining measurement precision
Solution Approach 2:
The system alternates between a driving period for displaying images and a sensing period for measuring OLED deterioration. The DAC switches between these two functions periodically, allowing the same component to serve both purposes without interference, thus resolving the contradiction between measurement precision and device complexity
2Device complexity
If ADCs are shared by multiple channels to reduce manufacturing cost and mounting area, then device complexity is reduced, but measurement time increases
Solution Approach 1:
The system implements periodic sensing during dedicated sensing periods between driving periods. Each channel's deterioration is measured in sequence during these sensing periods, allowing the DAC to serve multiple channels without requiring simultaneous measurement, thus reducing device complexity while maintaining efficient measurement timing
Solution Approach 2:
The sensing period is scheduled in advance between driving periods, allowing the system to prepare for measurement before it is needed. This preliminary timing arrangement ensures that deterioration measurement can be completed efficiently without extending the overall operation time
Data Source
AI summary
An organic light emitting display device includes pixels positioned at crossing regions between data lines and scan lines, each of the pixels including an organic light emitting diode, a scan driver configured to supply a scan signal to scan lines, a data driver configured to drive the data lines, wherein the data driver includes, in each channel, a supply part comprising a digital-to-analog converter configured to generate data signals using second data supplied from outside in a driving period, and a deterioration part configured to measure deterioration information of the organic light emitting diode using the digital-to-analog converter in a sensing period.