Electroluminescent Display Pixel Compensation Using Camera-Based Sensing
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Solution Overview
Problem
Existing electroluminescent display technologies face challenges in compensating for variations in electrical characteristics between pixels, leading to luminance variations, which complicates image quality and increases sensing time and manufacturing costs due to the need for external compensation techniques and complex circuit configurations.
Innovation Solution
An electroluminescent display system that includes a storage memory for average current-voltage expressions, a parameter calculation unit to determine offset and gain for each pixel, and a data correction unit to adjust input image data, utilizing camera-based sensing to reduce sensing time and simplify circuit configurations by storing initial characteristic values before TFT deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If external compensation technique is implemented to compensate for luminance variation, then image quality is improved, but sensing time increases
Solution Approach 1:
The patent applies preliminary action by measuring and storing electrical characteristics of pixels during the manufacturing process, before the display is put into service. This allows compensation data to be prepared in advance, eliminating the need for time-consuming sensing operations during actual display operation or user interaction.
Solution Approach 2:
The patent creates a copy of the electrical characteristics data by measuring current-voltage relationships and storing them as lookup tables or characteristic curves for each pixel. This copied data can then be used for compensation without requiring repeated real-time measurements, significantly reducing sensing time while maintaining compensation accuracy.
2Manufacturing precision
If external compensation technique is implemented to compensate for luminance variation, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent extracts the sensing and compensation functions from the display hardware and relocates them to the driver circuitry or processing system. By taking out the complex sensing operations from the pixel-level circuit configuration and implementing them through software algorithms or pre-stored data, the hardware circuit complexity is significantly reduced while maintaining compensation effectiveness.
Solution Approach 2:
The patent replaces complex hardware sensing circuits with computational methods. Instead of using additional physical sensing components and circuits to measure pixel characteristics in real-time, the system uses pre-measured data stored in memory and processes it through computational algorithms, substituting mechanical/electrical complexity with software-based solutions.
3Measurement precision
If sensing operation is performed to obtain I-V curve data, then compensation accuracy is improved, but productivity decreases
Solution Approach 1:
The patent applies preliminary action by performing all necessary I-V curve measurements and data acquisitions during the manufacturing process. This allows the display panels to be pre-characterized and compensated before being shipped to customers, eliminating the need for time-consuming sensing operations during deployment or user interaction, thereby improving productivity while maintaining measurement precision.
Solution Approach 2:
The patent implements a streamlined sensing process that efficiently captures the essential electrical characteristics without performing unnecessary measurements. By focusing only on the critical current-voltage relationship data needed for compensation and using optimized measurement procedures, the system achieves high compensation accuracy while minimizing the time required for sensing operations.
Data Source
AI summary
An electroluminescent display device and a method of compensating for electrical characteristics of the electroluminescent display device are disclosed. The electroluminescent display includes a storage memory storing an average current-voltage expression of a display panel and a current value for each pixel, a parameter calculation unit calculating an offset and a gain for each pixel for causing current characteristics for each pixel based on the current value for each pixel to coincide with average current characteristics based on the average current-voltage expression, and a data correction unit correcting input image data to be written to each pixel based on the offset and the gain for each pixel. The average current-voltage expression and the current value for each pixel are obtained through a camera-based sensing process.