Dynamic Initial Voltage Adjustment for OLED Display Compensation
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Solution Overview
Problem
Organic light emitting display devices face degradation over time, leading to decreased display quality due to degradation of organic light emitting diodes and driving transistors, which existing compensation methods fail to adequately address.
Innovation Solution
An organic light emitting display device with a pixel circuit that includes an initial voltage determining part to adjust the level of initial voltage based on image data, a sensing part to apply and receive sensing signals, and a data driver to apply data voltage, using a method that calculates luminance differences and adjusts voltages to compensate for transistor threshold variations, thereby improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional fixed initial voltage is applied to pixel circuits, then device structure remains simple, but display quality deteriorates due to transistor threshold voltage variations and component degradation
Solution Approach 1:
The patent applies dynamics principle by transforming the fixed initial voltage into a dynamic, adjustable voltage that changes based on image data characteristics. The initial voltage determining part dynamically adjusts the initial voltage level according to the luminance characteristics of each frame, allowing the system to adapt to varying display requirements and compensate for component variations without requiring complex external compensation circuits.
Solution Approach 2:
The patent implements parameter changes by modifying the initial voltage parameter based on image data analysis. The system calculates luminance differences from image data and uses this information to adjust the initial voltage level, thereby changing the operating parameters of the pixel circuit to maintain optimal display quality under different conditions and compensate for transistor threshold voltage variations.
2Reliability
If existing compensation modes are used, then some degradation can be corrected, but display quality continues to deteriorate due to inadequate compensation for luminance variations
Solution Approach 1:
The patent applies feedback principle by using image data as feedback to continuously adjust the initial voltage. The system analyzes the luminance characteristics of the displayed image and uses this feedback information to modify the initial voltage in subsequent frames, creating a closed-loop compensation mechanism that effectively counteracts component degradation and maintains consistent display quality over time.
Solution Approach 2:
The patent implements preliminary action by pre-adjusting the initial voltage based on predicted luminance requirements from image data analysis. Rather than waiting for degradation to occur and then compensating, the system proactively adjusts the initial voltage in advance based on the characteristics of the incoming image data, preventing display quality deterioration before it happens.
3Manufacturing precision
If frame-based luminance analysis is performed, then display quality improves through dynamic voltage adjustment, but processing time and computational load increase
Solution Approach 1:
The patent applies partial action principle by performing luminance analysis on representative blocks or regions of the image data rather than processing every pixel in the entire frame. This selective approach extracts sufficient information about luminance characteristics to adjust the initial voltage effectively, while significantly reducing the computational burden and processing time compared to full-frame analysis.
Data Source
AI summary
An organic light emitting display device includes: a display part comprising a plurality of pixel circuits, a pixel circuit from among the pixel circuits comprising: an organic light emitting diode; and a first transistor, the first transistor comprising a first electrode configured to receive a power source voltage and a second electrode connected to the organic light emitting diode; an initial voltage determiner configured to change a level of an initial voltage using image data of a frame; a sensor configured to apply the initial voltage to the second electrode of the first transistor; and a data driver configured to apply a data voltage to the control electrode of the first transistor.