Hybrid Compensation for Electroluminescent Display Luminance Uniformity
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Solution Overview
Problem
Electroluminescent display devices face issues with luminance nonuniformity due to differences in driving characteristics between pixels, leading to poor compensation performance and various side effects.
Innovation Solution
An electroluminescent display device and method that utilize a hybrid compensation technique, combining real-time prediction and off-sensing compensation, where video data is accumulated during power-on periods and driving characteristics are sensed during alternating power-off periods, to calculate and apply compensation values for correcting pixel data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If compensation is performed in all power off periods, then compensation performance is improved, but power consumption increases and device lifespan decreases
Solution Approach 1:
The patent implements periodic sensing operations at predetermined intervals during power-off periods rather than continuous sensing. The compensation value calculator performs sensing and calculates compensation values only at these periodic intervals, reducing power consumption while maintaining adequate compensation performance for driving characteristic differences.
2Measurement precision
If sensing is performed frequently, then driving characteristic differences are detected more accurately, but device lifespan is reduced due to increased stress
Solution Approach 1:
The patent limits sensing operations to periodic intervals during power-off periods, reducing the frequency of sensing operations compared to continuous or more frequent sensing. This periodic approach detects driving characteristic differences accurately enough while reducing stress on the display device, thereby extending device lifespan.
3Measurement precision
If real-time sensing is performed during power on periods, then compensation accuracy is improved, but productivity decreases due to accumulated time loss
Solution Approach 1:
The patent performs sensing operations during power-off periods at predetermined intervals rather than during active display periods. This timing strategy utilizes otherwise idle time for compensation operations, avoiding interference with normal display functionality and maintaining high productivity while achieving adequate compensation accuracy.
4Measurement precision
If compensation operations are performed continuously, then compensation performance is maximized, but device complexity increases
Solution Approach 1:
The patent implements a periodic sensing and compensation calculation mechanism that operates at predetermined intervals during power-off periods. This periodic approach simplifies control logic compared to continuous operation, as it uses simple timing-based triggering rather than complex continuous monitoring and adjustment mechanisms.
Data Source
AI summary
An electroluminescent display device includes a display panel including a plurality of pixels, a first compensation value calculator for calculating a first compensation value based on prediction according to an accumulation result of video data to be written in the pixels, a second compensation value calculator for calculating a second compensation value based on sensing according to an electrical sensing value with respect to driving characteristics of the pixels, and a data corrector for correcting the video data based on the first compensation value and the second compensation value.