Display Device Sensing Data Compensation via Lookup Tables
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Solution Overview
Problem
Display devices face errors in sensing data due to the influence of data voltages applied before generating sensing data, which affect the accuracy of electrical characteristic sensing in pixels.
Innovation Solution
A display device with a driving controller that compensates sensing data from sub-pixels based on grayscale values and black grayscale ratios using lookup tables, reducing errors by applying color and load compensation values during sensing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data voltage is applied to the pixel before sensing, then the sensing operation can be performed, but errors are introduced in the sensing data due to voltage-induced inaccuracies
Solution Approach 1:
The patent applies preliminary compensation action by storing compensation values in lookup tables before sensing operations. The driving controller retrieves appropriate compensation values based on grayscale values and applies them to correct sensing data, thereby eliminating errors introduced by pre-sensing voltage application while maintaining operational efficiency
2Measurement precision
If compensation values are stored in lookup tables for all grayscale values, then sensing data accuracy is improved, but device complexity increases
Solution Approach 1:
The patent utilizes parameter changes by organizing compensation values in lookup tables indexed by grayscale values. This allows the system to efficiently retrieve and apply appropriate compensation values based on the specific grayscale level being sensed, achieving high precision without requiring complex real-time calculation mechanisms
Data Source
AI summary
A display device includes a display panel including a pixel including a first sub-pixel displaying a first color, a second sub-pixel displaying a second color, and a third sub-pixel displaying a third color, a data driver applying a data voltage generated based on input image data to the pixel in an active period, sensing the first sub-pixel to generate first sensing data in a blank period, sensing the second sub-pixel to generate second sensing data in the blank period, and sensing the third sub-pixel to generate third sensing data in the blank period, and a driving controller compensating for the first sensing data, the second sensing data, and the third sensing data based on a grayscale value of the input image data.